JP4532383B2 - Telescopic device - Google Patents

Description

  The present invention relates to a telescopic device that is configured with a pair of telescopic legs and that can be easily adjusted in length.

  In general, an expansion / contraction device installed on a leg of furniture, a stepladder, etc. is equipped with a reciprocating expansion / contraction leg that is inserted into or externally inserted into a main leg, and the expansion / contraction leg is moved to an appropriate position to pin. The leg can be adjusted to a desired length by fixing with, for example. Furthermore, it is also conceived that an expansion / contraction member such as a spring is installed on the main leg and brought into contact with the expansion / contraction leg, and the expansion / contraction leg is easily moved using the elasticity of the expansion / contraction member.

For example, Patent Document 1 discloses an invention relating to a leg height adjuster that can easily and reliably adjust the height of a leg such as a chair or a bed under the name of “leg height adjuster”. .
The invention disclosed in Patent Document 1 includes a holding space in which a leg such as a chair or a bed can be inserted, and a plurality of bolt holes at predetermined positions on a side wall, and is formed so as to be placed on a floor surface. A cylindrical leg holder, a coil spring that is telescopically installed in the cylindrical leg holder, and an upper surface provided on the upper part of the coil spring that supports a leg such as a chair or a bed that is inserted into the cylindrical leg holder. The leg holder is provided with a fitting recess formed so as to be able to be placed and fitted with a bolt inserted into the lower surface through a bolt hole.
When raising the legs of a chair, bed, etc., first, insert the legs of the chair, bed, etc. into the cylindrical leg holder and bring the bottom of the legs into contact with the upper surface of the leg holder. In a state where the coil spring is compressed by force, the fitting recess on the lower surface of the leg support is coded as a bolt hole at a desired position. Then, when a bolt is inserted into this bolt hole and fixed with a nut, the expansion and contraction of the coil spring is suppressed and the position of the leg holder is fixed. As a result, the height of the leg of a chair or bed can be easily adjusted. It can be done.

Further, Patent Document 2 relates to a bicycle saddle lifting device that can easily adjust the height of the saddle while riding the bicycle using the elastic force of a spring under the name of “bicycle saddle lifting device”. The invention is disclosed.
The invention disclosed in Patent Document 2 is a shock absorber provided with a middle cylinder having a vertical engagement circumferential groove that is inserted in a seat post of a frame so as to be movable up and down, and a spring that biases the middle cylinder upward. And a locking device provided inside the seat post and provided with a locking claw for engaging with one of the upper and lower engaging circumferential grooves to lock the middle cylinder at a predetermined position, and attached to the upper end of the middle cylinder And a height-adjustable saddle, and an operating lever for operating a locking claw of the locking device.
When it is desired to increase the height of the saddle, the passenger operates the operation lever attached to the vicinity of the handle while straddling the saddle, and is engaged with the upper engagement circumferential groove of the middle cylinder. Remove the pawl. And when the hips are lifted slightly from the saddle, the middle cylinder is pushed upward by the elastic action of the spring of the compressed shock absorber, and the lower engaging circumferential groove is arranged at the locking position by the locking claw. By releasing the operation lever immediately to release the operation lever and engaging the locking claw with the lower engagement circumferential groove, the saddle can be raised.
Conversely, if you want to reduce the height of the saddle, operate the operating lever in the same way as when increasing the height of the saddle to remove the locking claw locked in the lower engaging circumferential groove of the middle cylinder. To do. As a result, the spring of the shock absorber is compressed by the weight of the passenger, the middle cylinder is lowered, and the upper engaging circumferential groove is disposed at the locking position by the locking claw, so that the operating lever is immediately released from the operating lever. When the lock is released and the engaging claw is engaged with the upper engaging circumferential groove, the lowering of the saddle can be locked.
As described above, in Patent Document 2, the height of the saddle can be easily adjusted while riding a bicycle by simply releasing or locking the latching claw with the operation lever, and compressing and expanding the spring of the shock absorber according to the weight of the rider. Can be adjusted.

And as an example which uses an expansion-contraction member also as a length adjustment member, the patent document 3 discloses the invention regarding the expansion-contraction shaft which can be stably installed in arbitrary positions with the name "extraction-contraction shaft".
The invention disclosed in Patent Document 3 includes a large pipe having a suction cup at the outer end, a small pipe slidably inserted into the large pipe and having a suction cup at the outer end, and the large pipe and the small pipe are expanded and contracted. The holding means includes a coil spring in which one end portion is fixed inside the large pipe and the other end portion is inserted into the small pipe, and the large pipe. It has a projection provided at the inner end of a small pipe located inside and engaging with a helical portion of a coil spring.
And when installing the telescopic shaft on the opposing wall surface, first, when the large pipe and the small pipe are rotated relative to the axial direction, the protrusion moves along the spiral portion of the coil spring, and as a result The length of the telescopic shaft is adjusted by relatively moving the large pipe and the small pipe in the axial direction. Subsequently, when the suction cups provided at both ends are pressed against the wall surface and deformed, the telescopic shaft is horizontally installed between the wall surfaces by the suction force of the suction cup and the frictional force acting on the suction portion. Moreover, since the coil spring can be expanded and contracted from the end portion fixed to the large pipe to the projection, when the large and small pipes are moved until the coil spring is compressed and the expansion shaft is installed, Since the elastic force of the coil spring acts on the suction cup in addition to the adsorption force and the frictional force, it can be held in a more stable state.
Japanese Utility Model Publication No. 64-41348 Japanese Utility Model Publication No. 6-39687 Japanese Utility Model Publication No. 5-27317

  However, the conventional techniques described in Patent Document 1 and Patent Document 2 have a structure in which a leg is expanded and contracted using the elastic force of a spring and fixed at a preset position. There has been a problem that the desired leg length cannot be achieved and the leg length and height cannot be finely adjusted. Furthermore, since the plurality of legs are individually installed, it is necessary to adjust the height or length for each target leg, and there is a problem that the operation is complicated and the required time is increased.

  In addition, in the conventional technique described in Patent Document 3, although there is an idea of adjusting the rough length of the telescopic shaft by engaging the projection of the small pipe with the spiral portion of the coil spring, Since the pipe is not fixed and the telescopic shaft can be expanded and contracted in the axial direction by the elasticity of the coil spring, the coil spring is actually the length of the telescopic shaft by engaging with the projection of the small pipe. The length of the coil spring that can be expanded and contracted is determined. Moreover, since it has a structure that can expand and contract when a load is always applied, there is a problem that it cannot be applied to a leg that is loaded on the upper part.

  The present invention has been made in response to such a conventional situation, and it is possible to easily and roughly adjust the length of a leg portion including a pair of telescopic legs, and to firmly fix the leg length at the same time. It is an object to provide a flexible telescopic device.

In order to achieve the above object, a telescopic device according to a first aspect of the present invention includes a leg portion having a window portion in a part of a hollow cylinder, and a first slidable portion by inserting one end portion of the leg portion. An extendable leg, a second extendable leg that is slidable by inserting the other end of the leg, and a first slide member that is provided at one end of the leg and is slidable inside the leg A first length adjusting member constituted by a tension spring having one end fixed and spirally formed, and a first length adjusting member provided in the other end of the leg and slidable inside the leg. A second length adjusting member constituted by a tension spring formed in a spiral shape with one end fixed to the two slide members, a first length adjusting member in a window provided in the leg, and A locking portion for locking the second length adjusting member, and the locking portion is slidably inserted from the window portion to be the first length adjusting member. And a locking member for preventing the movement of the first length adjusting member and the second length adjusting member by striking the second length adjusting member, and a window portion provided with the locking member on the leg portion And a fixing member to be fixed to.
Further, the telescopic device according to the second aspect of the present invention includes a leg portion having a window portion in a part of the hollow cylinder, and a first telescopic leg portion that can slide by inserting one end portion of the leg portion. A second telescopic leg that is slidable by inserting the other end of the leg, a first telescopic member interposed between the one end of the leg and the first telescopic leg, and the leg A second telescopic member interposed between the other end portion and the second telescopic leg portion, and a first slide member provided in one end portion of the leg portion and slidable inside the leg portion. A first length adjusting member constituted by a helical spring formed with a fixed end and a second spring that is provided at the other end of the leg and is slidable inside the leg. A second length adjusting member constituted by a helical spring having one end fixed to the slide member, and a first length adjusting member and a window provided in the leg; A locking portion that locks the second length adjusting member, and the locking portion is slid and inserted from the window portion to stab the first length adjusting member and the second length adjusting member. And a locking member that suppresses the movement of the first length adjusting member and the second length adjusting member, and a fixing member that fixes the locking member to a window portion provided in the leg portion. .
In the telescopic device according to claim 2 configured as described above, first, when one end portion of the leg portion is pushed into the first telescopic leg, the first telescopic member is contracted and the leg portion is inside the first telescopic leg. It will be stored in. In response to this operation, the first slide member moves in the direction of the other end in the leg portion, and the first length adjusting member also moves together with the first slide member. Similarly, when the other end of the leg is pushed into the second telescopic leg, the second telescopic member is contracted while the leg is housed inside the second telescopic leg, and at the same time, the second slide. The member moves in the direction of one end in the leg, and the second length adjusting member also moves in the direction of the one end along the movement of the second slide member. Have
Further, when the locking member is slid and inserted in the window portion provided in the leg portion, the locking member pierces the gap between the first length adjustment member and the second length adjustment member arranged in the window portion. It has the effect | action of suppressing the movement of a 1st length adjustment member and a 2nd length adjustment member. Then, when the locking member being stabbed is pulled out, the first telescopic leg and the second telescopic leg are automatically pulled out from the leg portion by the elasticity of the first telescopic member and the second telescopic member, At the same time, the first slide member and the first length adjusting member fixed to the first slide member move toward one end of the leg portion, and the second slide member and the second slide are moved. The second length adjusting member fixed to the member has an action of moving toward the other end of the leg.

In addition, the telescopic device according to the invention of claim 3 includes a leg portion having a window portion in a part of the hollow cylinder, and a first telescopic leg portion that can slide by inserting one end portion of the leg portion, One end of a second telescopic leg that can be slid by inserting the other end of the leg, and a first slide member that is provided at one end of the leg and can slide inside the leg Is connected to the other end of the first length adjusting member and extends to the other end of the leg. The guide member is provided, and a tension spring formed in a spiral shape with one end fixed to a second slide member provided inside the other end of the leg and slidable inside the guide member A second length adjusting member to be engaged with the first length adjusting member and the second length adjusting member in the window provided in the leg portion The locking portion is slid and inserted from the window portion to stab the first length adjusting member and the second length adjusting member, and the first length adjusting member and the second length adjusting member. A locking member that suppresses the movement of the length adjusting member and a fixing member that fixes the locking member to a window provided in the leg.
Furthermore, the telescopic device according to the invention of claim 4 is provided with a leg part having a window part in a part of the hollow cylinder, a first telescopic leg part capable of sliding by inserting one end part of the leg part, A second telescopic leg that is slidable by inserting the other end of the leg; a first telescopic member interposed between the one end of the leg and the first telescopic leg; A second telescopic member interposed between the other end portion and the second telescopic leg portion, and a first slide member provided in one end portion of the leg portion and capable of sliding inside the leg portion. A first length adjusting member constituted by a tension spring having a fixed end and a spiral, and the other end of the leg connected to the other end of the first length adjusting member A guide member that extends to the other end of the leg, and a second slide member that is slidable inside the guide member and that is slid inside the guide member. And a locking portion for locking the first length adjusting member and the second length adjusting member in the window provided in the leg portion. The stop portion is slid from the window portion and stabs the first length adjustment member and the second length adjustment member to prevent the movement of the first length adjustment member and the second length adjustment member. And a fixing member that fixes the locking member to a window portion provided on the leg portion.
In the telescopic device according to claim 4 of the above-described configuration, the guide member is substantially the same as the telescopic device according to claim 2 except that the guide member is connected to the other end of the leg portion from the other end of the first length adjusting member. It is characterized by extending to the end.
Therefore, when the other end of the leg portion is pushed into the second telescopic leg, the second telescopic member contracts while the leg portion is housed inside the second telescopic leg, and at the same time, the second slide member. Moves inside the leg in the direction of one end, and the second length adjusting member moves inside the guide member in the direction of one end of the leg, along with the movement of the second slide member. Thus, the second length adjusting member also has an action of moving in the direction of one end of the leg portion. Since the guide member is connected to the other end of the first length adjusting member and extends to the other end of the leg, the second length adjusting member continues from the inside of the guide member. It moves within the length adjusting member. The guide member is a member that acts so as not to cause problems such as meandering in the leg portion by inserting the second length adjusting member.
In addition, the action when slidingly inserting or removing the locking member in the window provided in the leg is the same as that of the invention described in claim 2 .

According to a fifth aspect of the present invention, in the telescopic device according to the third or fourth aspect , the guide member is constituted by a helically formed push spring.
In the telescopic device having the above-described configuration, in addition to the operation of the invention according to claim 3 or 4 , the first slide member and the first slide member that accompany the insertion of one end of the leg into the first telescopic leg are provided. Due to the movement of the leg portion of the length adjusting member 1 toward the other end, the guide member constituted by the push spring moves and is compressed. In addition, when the locking by the locking member is released from the compressed state, the guide member constituted by the push spring moves the first slide member and the first length adjusting member to one of the leg portions by the elasticity of the spring. It has the effect | action of pushing to the edge part direction.

According to a sixth aspect of the present invention, there is provided a telescopic device according to the fifth aspect of the present invention, wherein the extension device according to the fifth aspect is configured to form a helical spring or a guide member that forms the first length adjusting member. At least one of the springs and the spiral direction of the helical spring that forms the second length adjusting member are different directions.
In the expansion / contraction device having the above-described configuration, in addition to the operation of the fifth aspect of the present invention, at least one of the helical spring formed as the first length adjusting member and the push spring included in the guide member that are in contact with each other. On the other hand , since the spiral directions of the helical springs forming the second length adjusting member are different from each other, the spiral springs have an action of preventing the spirals from being caught or entangled.

Furthermore, the expansion / contraction apparatus according to the seventh aspect of the present invention is the expansion / contraction apparatus according to any one of the first to sixth aspects, wherein the locking member has a flat plate shape having a notch. .
In extension device configured as described above, in addition to the effect of the invention of claim 1 to claim 6, wherein a notch portion formed in the locking member, the stab only the first length adjusting member forming the outer periphery It has the effect of increasing the impingement area.

The telescopic device according to the eighth aspect of the present invention is arranged in a leg portion having a window portion and a groove portion formed along a longitudinal direction of the hollow tube in a part of the hollow tube, and the leg portion. A length adjusting member constituted by a protrusion part of which protrudes from the groove part and slides in the groove part and is slidable inside the leg part; a tension spring fixed to the protrusion part and formed in a spiral; An elastic member connected to the length adjusting member via a slide member, and a locking portion that locks the length adjusting member in the window portion provided on the leg portion. It includes a locking member that slides into the length adjusting member to prevent the movement of the length adjusting member, and a fixing member that fixes the locking member to a window provided in the leg portion. .
In the telescopic device configured as described above, when the protrusion is slid into the groove of the leg and slid, the length adjusting member fixed to the protrusion and the slide member fixed to the length adjusting member interlock with the protrusion. The telescopic member contracts simultaneously with the movement.
Further, when the locking member is slid and inserted in the window portion of the leg portion, the locking member has an effect of blocking the movement of the length adjusting member by piercing the gap of the length adjusting member arranged in the window portion. . Then, when the stabbed locking member is removed, the projecting portion and the length adjusting member are urged by the elasticity of the expansion and contraction member to slide toward the original position.

An expansion / contraction device according to a ninth aspect of the present invention includes the expansion / contraction device according to the eighth aspect , wherein the expansion / contraction device is fixed to the protrusion and includes a telescopic leg portion that is slidable by inserting the leg portion. .
In the telescopic device having the above-described configuration, in addition to the operation of the invention of claim 8 , the telescopic leg portion has an operation of sliding in conjunction with the protrusion and inserting the leg portion.

In the telescopic device according to the first to fourth aspects of the present invention, it is possible to easily and simultaneously adjust the length of the leg portion configured by including the pair of telescopic legs. In addition, since the length of the leg can be set for each gap of the helical tension spring constituting the length adjusting member, it can be finely adjusted, and the locking member can be stabbed by the tension spring. Is held by frictional force, so that the locking member is difficult to come off.

In the telescopic device according to the fifth aspect of the present invention, since the push spring constituting the guide member has an elastic action in addition to the elastic action of the first elastic member, one end of the leg portion When the state where the first telescopic leg portion is pushed and locked is released, the first telescopic leg portion is easily pulled out from the leg portion due to the biasing force of the push spring.

And in the expansion-contraction apparatus of Claim 6 of this invention, at least any one of the tension spring formed in the helical form which comprises a 1st length adjustment member, or the press spring which comprises a guide member, and 2nd The tension spring formed in the length adjustment member is not caught or entangled. Accordingly, the movement of the leg of the first length adjusting member toward the other end and the movement of the leg of the second length adjusting member toward the one end are facilitated and connected. The sliding movement of the first telescopic leg portion and the second telescopic leg portion is also facilitated.

Furthermore, in the telescopic device according to claim 7 of the present invention, since the locking member can stab only the first length adjusting member, the first length adjusting member is locked. The length of the other end of the leg can be adjusted by the second length adjusting member. In addition, since the impingement area can be made larger than that of the linear locking member having no notch, only the first length adjusting member can be impregnated more firmly.

And in the expansion-contraction apparatus of Claim 8 of this invention, the length adjustment member fixed to the projection part which slides the groove part formed along the shape of a leg part is latched, and the length of a leg part is latched. Therefore, even if the leg portion has a curved shape other than the linear shape, it can be dealt with. Moreover, since the structure is simple, it is advantageous in manufacturing and maintenance.

In the telescopic device according to claim 9 of the present invention, since the telescopic leg portion fixed to the protrusion is installed, the length of the telescopic leg portion is easily determined by adjusting the length of the leg portion. can do.

Below, the best embodiment of the expansion-contraction apparatus which concerns on this invention is described based on FIG. 1 thru | or FIG. (In particular, it corresponds to claims 1 to 7 )
FIG. 1 is a longitudinal sectional view of the telescopic device according to the present embodiment of the present invention.
In FIG. 1, the telescopic device 1 according to the present embodiment is a hollow cylinder having a gate shape, and both ends thereof are formed with a leg portion 2 forming a first leg 2 a and a second leg 2 b, respectively, and an upper portion is opened. It is a hollow cylinder having an inner diameter larger than the outer diameter of the leg 2, and the end of the first leg 2 a and the end of the second leg 2 b that can be slid are inserted and slid. A possible second telescopic leg 4 is provided.
A spiral first push spring 5 is interposed between the first leg 2 a and the first extendable leg 3, and the first push spring 5 is provided on the first extendable leg 3. It is fixed by a convex lower end tool 6 and a push spring fixing tool 7 installed on the side surface of the first leg 2a. Similarly, a spiral second pressing spring 8 is interposed between the second leg 2b and the second telescopic leg 4, and the fixing thereof is the convex shape of the second telescopic leg 4. The lower end tool 9 and the pressing spring fixing tool 10 installed on the side surface of the second leg 2b are used. The first push spring 5 and the second push spring 8 are adapted to expand and contract following the sliding movement of the first extendable leg 3 and the second extendable leg 4.

The first telescopic legs 3 are connected to a first cylinder 11 formed integrally with a lower end tool 6 which is a bottom portion of the first telescopic legs 3 and an upper portion of the first cylinder 11. A convex first piston 12 corresponding to one slide member is provided. The first cylinder 11 and the first piston 12 are formed smaller than the inner diameter of the first leg 2a and can be inserted into the first leg 2a. In FIG. 11 and the first piston 12 are disposed inside the first leg 2a.
In addition, the leg portion 2 corresponds to a spiral first tension spring 13 and a guide member corresponding to the first length adjusting member from the first leg 2a to the second leg 2b. A spiral third pressing spring 15 is filled via a connector 14, the first tension spring 13 is on the first piston 12, and the third pressing spring 15 is on the end of the second leg 2b. Are fixed to each. The first piston 12 is slidable inside the leg 2, and when the first piston 12 slides in the leg 2, the first pulling spring 13 and the connecting tool 14 that are connected follow this sliding movement. On the other hand, the third push spring 15 is expanded and contracted.
Further, in the present specification, the “push spring” is a spiral spring having a gap at normal times, and is a spring that exerts a reaction force when the gap between the spiral gaps is narrowed and contracted. “A tension spring” is a spiral spring that normally has little or no gap, but “a tension spring” does not necessarily have to exhibit a restoring force when the spring is pulled. It is based on the shape.

Similarly, the second telescopic leg 4 is connected to the second cylinder 16 formed integrally with the lower end tool 9 serving as the bottom of the second telescopic leg 4 and the upper part of the second cylinder 16. A convex second piston 17 corresponding to the second slide member is provided. The second cylinder 16 and the second piston 17 are formed smaller than the inner diameter of the third pressing spring 15 inscribed in the second leg 2b, and can be inserted into the third pressing spring 15. In FIG. 1, the upper portion of the second cylinder 16 is disposed in the second leg 2b, and the second piston 17 is disposed in the third push spring 15 inscribed in the second leg 2b. .
The second piston 17 is fixed with a spiral second tension spring 18 corresponding to a second length adjusting member, and the second tension spring 18 is substantially the entire length of the leg 2. It has a half length and is disposed to the second leg 2 a side beyond the locking portion 19. The second piston 17 is slidable inside the third push spring 15 inscribed in the leg portion 2 and the second leg 2b, and the second tension spring 18 connected to the second piston 17 is Following the sliding movement of the second piston 17, the third pressing spring 15 and the inside of the first tension spring 13 connected to the third pressing spring 15 via the connector 14 are moved. Yes. Here, the third push spring 15 connects the first tension spring 13 and the end of the second leg 2b via the connector 14, and the second piston 17 and the second tension spring 18 are connected to the first tension spring 13. It plays the role of guiding in the direction of the leg 2a.
Since the second tension spring 18 has a spiral shape in a different direction from the first tension spring 13 and the third tension spring 15, the third tension spring 15 and the first tension spring 13 The springs can be easily moved without being caught or entangled with each other. Needless to say, the first cylinder 11 and the second cylinder 16 are not particularly cylindrical and may be solid columns.
Further, since the first tension spring 13 and the third push spring 15 are inscribed in the second leg 2a and the second leg 2b, respectively, friction occurs. In particular, it is desirable that the radius of curvature be large because the influence is large at the portion bent into a gate shape.

Reference numeral 19 denotes a locking portion, which includes a stopper 21 having a handle 20 and a fixing member 22 that fixes the stopper 21 and is fixed to the leg portion 2. The stopper 21 can be slid into a stopper insertion window 23 provided in the leg portion 2, and when the handle 20 is pushed, the stopper 21 passes through the stopper insertion window 23 and is inscribed in the leg portion 2. The gap between the spiral first tension spring 13 located at the second tension spring 13 and the second tension spring 18 inscribed in the first tension spring 13 is stabbed to suppress the movement of these tension springs. The first piston 12, the first cylinder 11 and the first telescopic leg 3 connected to the tension spring 13, and the second piston 17, the second cylinder 16 and the first cylinder 16 connected to the second tension spring 18. The movement of the second telescopic leg 4 is suppressed, the first leg 2a and the second leg 2b are fixed, and their lengths are determined.
In the present embodiment, the telescopic device has a gate shape. However, if the legs are formed in pairs, the shape of the legs 2 is not limited to the gate shape as shown in FIG. In addition, it may be substantially U-shaped such that the legs extend from both ends of the semicircle, that is, the shape of the portion connecting the pair of legs may be linear or curved. Good. Furthermore, it does not specifically limit to what curves to a gate shape or a U-shape, A pair of leg part which the whole extends linearly may be sufficient.

Next, the extension / contraction mechanism of the leg will be described in detail with reference to FIGS. 2 and 3, the same parts as those shown in FIG. 1 are denoted by the same reference numerals, and description of the configuration is omitted.
First, the extension / contraction mechanism of the first leg will be described with reference to FIG. FIG. 2 is a longitudinal sectional view for explaining the first leg expansion / contraction mechanism of the expansion / contraction apparatus according to the present embodiment.
In FIG. 2, the telescopic device 1 is in a state where the first leg 2a is contracted and the second leg 2b is extended and fixed. When the first leg 2 a is contracted as shown in FIG. 2, first, when the first telescopic leg 3 is slid upward, the first leg 2 a is inserted and stored inside the first telescopic leg 3. At the same time, the first piston 12 coupled to the first telescopic leg 3 via the first cylinder 11 and the lower end tool 6 is also linked to the first telescopic leg 3 and inserted into the first leg 2a. It will be done. At this time, the first pressing spring 5 interposed between the first telescopic leg 3 and the first leg 2a is compressed. Then, the first pulling spring 13 whose one end is fixed to the first piston 12 is pressed by the first piston 12 together with the connector 14 and moves in the direction of the second leg 2b. On the other hand, since the end of the third pressing spring 15 is fixed to the end of the second leg 2b, the third pressing spring 15 is compressed by the force from the first piston 12.

Here, when the stopper 21 is inserted from the stopper insertion window 23 in the locking portion 19, the stopper 21 pierces the spiral gap of the first tension spring 13 disposed in the stopper insertion window 23, and the first While suppressing the movement of the tension spring 13, the movement of the connecting tool 14, the third push spring 15, the first piston 12, the first cylinder 11 and the lower end tool 6 and the first telescopic leg 3 is suppressed, The length of the first leg 2a is determined. When the stopper 21 is engaged, the first push spring 5 and the third push spring 15 are held in a compressed state.
Further, as described above, the first tension spring 13 has a spiral structure in which spirals are densely formed, and the width of the spiral gap is narrow and there are almost countless numbers, so the first leg 2a. Can be set finely or steplessly. That is, FIG. 2 shows an example in which the first leg 2a is fixed by sliding to the position where the upper end of the first telescopic leg 3 is fitted to the push spring fixture 7. When the telescopic leg 3 is slid upward and stopped at an arbitrary position, the first piston 12 and the first pulling spring 13 also follow and move and stop. Since any gap of the spiral of the tension spring 13 is disposed, the length of the first leg 2a can be freely adjusted by inserting the stopper 21 into the disposed gap.
In the present embodiment, the upward sliding movement of the first telescopic leg 3 is possible until the lower end of the first leg 2a contacts the lower end tool 6, but the first leg 2a An annular stop member may be provided on the outer periphery to stop the sliding movement of the first telescopic leg 3, or the first spring leg 3 may be expanded by expanding the push spring fixture 7 outward. It may be used as a stop member that cannot slide any more.

On the contrary, when releasing the locked state shown in FIG. 2, when the stopper 21 stuck in the gap of the first pulling spring 13 is removed, the compressed first pressing spring 5 expands. Thus, the first telescopic leg 3 is automatically slid downward. At this time, with the movement of the first telescopic leg 3, the first piston 12, the first tension spring 13 and the connector 14 move in the direction of the first leg 2a. Further, since the third push spring 15 is also compressed in the locked state, the third push spring 15 is extended by the removal of the stopper 21, and the first connecting spring 14 and the first pull spring 13 are not connected to the first push spring 15. A force in the direction of the leg 2a acts.
Further, in the expansion / contraction structure of the second leg 2b, which will be described later, since the push spring corresponding to the third push spring 15 is not installed, when the locked state is released, the second extendable leg 4 is It is urged weaker than the telescopic legs 3 and is extracted. In order to eliminate such an imbalance, the first tension spring 13 mounted inside the leg portion 2 is designed to be long and the third push spring 15 is shortened. You may make it make the extraction output of the 2nd expansion-contraction leg 4 equal. In this case, the tension spring has a structure in which the spiral is formed more densely than the push spring, so that the weight is heavy and the weight of the entire apparatus increases, but the second tension spring 18 moves in the direction of the first leg 2a. In this case, since the distance at which the second tension spring 18 contacts the third push spring 15 is shortened, the second tension spring 18 is difficult to bite into the spiral gap of the third push spring 15 and can move smoothly. There is an effect.

Next, the extension / contraction mechanism of the second leg will be described with reference to FIG.
FIG. 3 is a longitudinal sectional view for explaining a second leg expansion / contraction mechanism of the expansion / contraction apparatus according to the present embodiment.
In FIG. 3, the telescopic device 1 is in a state where the second leg 2b contracts and the first leg 2a expands and is fixed. The expansion / contraction mechanism of the second leg 2b is substantially the same as the expansion / contraction mechanism of the first leg 2a described above. When the second leg 2b is contracted as shown in FIG. 4 is slid upward, and the second leg 2b is inserted into the second telescopic leg 4 and stored. At this time, the second push spring 8 interposed between the second extendable leg 4 and the second leg 2b is compressed, and the lower extender leg 9 and the second extender leg 4 are attached to the second extendable leg 4. The second piston 17 connected via the cylinder 16 moves upward in conjunction with the second telescopic leg 4 and is inserted into the third push spring 15 inscribed in the second leg 2b. Go. Then, the second spring 18 having one end fixed to the second piston 17 is pressed by the second piston 17 and moves in the direction of the first leg 2a.
Here, when the stopper 21 is inserted from the stopper insertion window 23 in the locking portion 19, the stopper 21 pierces the spiral gap of the second tension spring 18 disposed in the stopper insertion window 23, and the second While the movement of the tension spring 18 is suppressed, the movement of the second piston 17, the second cylinder 16 and the lower end tool 9 and the second telescopic leg 4 is also suppressed, and the second push spring 8 is compressed. The length of the second leg 2b is determined.
The flexible adjustment of the length of the second leg 2b by the stopper 21 is the same as in the case of the first leg 2a.
Further, an anti-sliding mechanism for the upward movement of the second extendable leg 4 can be provided in the same manner as in the case of the first extendable leg 3.
On the contrary, when releasing the locked state shown in FIG. 2, when the stopper 21 stuck in the gap of the second tension spring 18 is removed, the compressed second pressing spring 8 is released. It expands and the second telescopic leg 4 is automatically slid downward. At this time, the second piston 17 and the second tension spring 18 also move in the direction of the second leg 2b as the second telescopic leg 4 moves.
When adjusting the lengths of both the first leg 2a and the second leg 2b on the left and right, the first leg 2a is adjusted first, and the stopper 21 is attached only to the first tension spring 13. After the piercing, the length of the second leg 2b may be adjusted to pierce the stopper 21 further to the second tension spring 18.

As described above, the expansion / contraction mechanism of the first leg 2a and the second leg 2b has been described separately with reference to FIGS. 2 and 3, but in this embodiment, the stopper 21 in the locking portion 19 has a first impact. Since the first pulling spring 13 and the second pulling spring 18 are both performed, the first leg 2a and the second leg 2b are simultaneously expanded and contracted by executing and releasing the locking by the stopper 21. Thus, the length of the first leg 2a and the second leg 2b can be adjusted and determined simultaneously.
That is, in FIG. 2 and FIG. 3, the locking at the locking portion 19 is such that the stopper 21 first stabs the first pulling spring 13 that becomes the outer ring, and then the second pulling spring 18 that becomes the inner ring. The length of the first leg 2a and the length of the second leg 2b are determined by inhibiting the movement of the first pulling spring 13 and the second pulling spring 18 by piercing.
Conversely, when the stopper 21 is removed from the contracted state of the first leg 2a and the second leg 2b and the locking is released, the first push spring 5 and the first spring 5 released from the compressed state are released. Because of the elasticity of the second push spring 8, the first telescopic leg 3 and the second telescopic leg 4 are simultaneously pulled out, and the first telescopic leg 3 and the second telescopic leg 4 are slidable. The lengths of the first leg 2a and the second leg 2b are moved by moving the first tension spring 13 and the second tension spring 18 that follow the sliding movement of the first telescopic leg 3 and the second telescopic leg 4. Can be adjusted.

Next, the structure and mechanism of the locking portion will be described in more detail with reference to FIGS. 4 to 6, the same parts as those shown in FIG. 1 are denoted by the same reference numerals, and description of the configuration is omitted.
FIG. 4 is a conceptual diagram showing a locking portion of the telescopic device according to the present embodiment.
In FIG. 4, the locking portion 19 includes a fixing member 22, a stopper 21, and a handle 20, and is disposed at the approximate center of the leg portion 2. In the fixing member 22, two square members connected by bolts 24 are juxtaposed with a gap 25 therebetween, and the leg portion 2 penetrates both. The stopper 21 is inserted into the gap 25 and pivoted on the bolt 24 so as to be rotatable. Although not shown, the stopper 21 passes through a stopper insertion window provided in the leg portion 2 and pierces the first and second tension springs inside the leg portion 2. The stopper 21 is fixedly provided with a handle 20 by bolts and nuts fitted in the two bolt holes 26, 26. By operating the handle 20 in the vertical direction, the stopper 21 is rotated. The first pulling spring and the second pulling spring inside the leg portion 2 are engaged and released by stab. Further, the handle 20 is provided with a handle cradle 28 fixed to the cover 27 of the leg 2, and this handle cradle 28 has a role of placing the handle 20 and stopping the rotation of the stopper 21. Plays. Reference numeral 29 denotes a fixing tool for fixing the cover 27 and the leg 2.

Next, the stopper will be described with reference to FIG.
Fig.5 (a) is a top view of the stopper of the latching | locking part of the expansion-contraction apparatus which concerns on this Embodiment, (b) is the arrow view of the part shown by the AA line in Fig.5 (a). It is sectional drawing.
In FIG. 5 (a), the stopper 21 has a long and thin flat plate shape. Two bolt holes 26 and 26 for attaching a handle are provided on one end side, and fixed on the other end side. Bolt holes 33 are provided for sandwiching and rotating between the members. And the notch part 30 is provided in the part of the blade which stabs the 1st pulling spring and the 2nd pulling spring which are shown in the left side in Drawing 5 (a). A first blade 31 and a second blade 32 are formed stepwise.
Further, as shown in FIG. 5B, when the cross sections of the first blade 31 and the second blade 32 are viewed, the first blade 31 is longer than the second blade 32. The tip of the blade is also sharply formed.
Although the effect of the stopper 21 in the shape of the stopper 21 will be described later, the first and second blades 31 and 32 of the notch 30 allow the stopper 21 to be easily and reliably connected to the first and second pulling springs. Can stab springs.

Next, a locking method using a stopper will be described with reference to FIG.
FIG. 6A is a conceptual diagram showing a state in which the stopper of the locking portion of the telescopic device according to the present embodiment is released, and FIG. It is a conceptual diagram which shows the state which performed the latching of the 1st step, (c) is a conceptual diagram which shows the state which the stopper of the latching | locking part of the expansion-contraction apparatus similarly performed the latching of the 2nd step.
First, in FIG. 6A, the stopper 21 is rotated upward about a bolt inserted into the bolt hole 33 as the handle 20 is lifted upward. In this state, the first blade 31 and the second blade 32 of the notch 30 of the stopper 21 are not in contact with the first pulling spring 13 and the second pulling spring 18, and the first of the stopper 21. The engagement of the pulling spring 13 and the second pulling spring 18 by the piercing is released. At this time, since the first tension spring 13 and the second tension spring 18 can freely move in the leg portion 2, as described above, the first extension leg and the second extension leg are slid and moved. Thus, the lengths of the first leg 2a and the second leg 2b can be adjusted.

Next, in FIG. 6B, when the handle 20 is slightly lowered, the corners of the first blade 31 and the second blade 32 of the notch 30 of the stopper 21 are moved to the first tension spring 13. Immediately upon contact, the gap of the spiral is stabbed, and the movement of the first tension spring 13 is suppressed. Then, the first telescopic leg 3 is fixed and the length of the first leg 2a is determined. However, in the state shown in FIG. 6B, the stopper 21 only locks the first tension spring 13, so that the second tension spring 18 can freely move in the leg portion 2. Yes, that is, with the first leg 2a fixed, the second telescopic leg 4 can be slid to adjust the length of the second leg 2b.
Further, the step-like first blade 31 and second blade 32 formed in the notch 30 of the stopper 21 can contact the first tension spring 13 at two locations in the same circumferential direction. Compared to a linear blade that contacts one tension spring 13 at only one location, the probability of matching the gap between the spiral first tension springs 13 is high. And make sure. Further, as described above, since the tip portions of the first blade 31 and the second blade 32 are formed sharply, the stopper 21 has a structure that can be easily inserted into the spiral gap of the first tension spring 13. Yes. When the stopper 21 pierces the gap of the first pulling spring 13, the stopper 21 is sandwiched by the pulling spring continuous with the gap to be pierced, so that it is difficult to come out, and the locking can be surely executed.
The shape of the notch 30 formed in the stopper 21 is not particularly limited, but a structure in which a plurality of locations simultaneously contact the first tension spring 13 in the same circumferential direction is preferable. Furthermore, as the shape of the blade, it is desirable that the area in contact with the tension spring is as large as possible.

Subsequently, in FIG. 6C, when the stopper 21 is further lowered, the notch 30 of the stopper 21 is in a state where the first pulling spring 13 is stuck, that is, in a state where the first leg 2a is fixed. The corner of the second blade 32 contacts the second pulling spring 18 to pierce the spiral gap, thereby restraining the movement of the second pulling spring 17 and fixing the second telescopic leg 4. The length of the second leg 2b is determined.
Further, a third blade is formed in a stepped manner in the notch portion 30, and this third blade together with the second blade 32 contacts the second tension spring 18 at two locations in the same circumferential direction. In this case, the second tension spring 18 can be easily stabbed in the same manner as the first tension spring 13.
Further, when one gap between each of the first tension spring 13 and the second tension spring 18 is stabbed by the stopper 21, the stopper 21 is sandwiched between the tension springs continuous with each one gap, By the action of a pulling spring that always exerts a force to narrow the gap, it is fixed without loosening, and a stable locking state can be continued.

In this embodiment configured as described above, the lengths of the legs can be easily and simultaneously expanded and contracted by simply extending and retracting the pair of extendable legs simply by inserting and removing the stopper at the locking portion. Can be adjusted.
In addition, a helical tension spring is used for the length adjusting member, and the latching portion stabs and latches the gap between the tension springs, so that a strong and stable latching state can be maintained. Since the gap between the tension springs has a substantially continuous structure, the length of the leg can be finely adjusted.
And since the shape of the stopper of the locking part is devised, it is easy and reliable to strike the tension spring, and in addition, the other leg of the other leg is fixed with one leg of the pair of legs fixed. The length can be adjusted.
Next, an example of the telescopic device according to the present embodiment will be described with reference to FIGS.

FIG. 7 is a conceptual diagram of a stepladder equipped with the telescopic device according to the present embodiment, and FIG. 8 is a conceptual diagram showing an internal structure of the stepladder equipped with the telescopic device according to the present embodiment. 7 and 8, the same parts as those shown in FIG. 1 are denoted by the same reference numerals, and description of the configuration is omitted.
In FIG. 7, the stepladder 34 is equipped with a telescopic device 1 formed in a gate shape along a first leg 35, a second leg 36, and a third step platform 37. Then, the second leg 36 is extended and stands on the ground 38, while the first leg 35 is fixed in a state of being contracted to the shortest. In order to install the stepladder 34 on the step 39 below the first leg 35, the user adjusts the length of the first leg 35 according to the step 39. In this adjustment, when the stopper of the locking portion 19 installed on the third-stage step 37 is removed and the locking is released, the second leg 36 is in contact with the ground 38 and does not move. The first leg 35 is automatically pulled downward by the extension force of the first push spring 5 installed and compressed in the telescopic device 1 and reaches the step 39 and stops.
Even when the first leg 35 reaches the step 39, the first push spring 5 is not fully extended, so that the leg end tool 40 of the first leg 35 is subjected to a downward force due to the elasticity of the spring. When the first leg 35 side of the stepladder 34 is slightly lifted, the first leg 35 is further extracted, and conversely, when the first leg 35 side is pushed, the first leg 35 contracts. Therefore, although not shown in the drawings, when the length of the first leg 35 is finely adjusted with reference to a level installed on the stepladder 34 and the stopper is inserted in the locking portion 19 to execute locking, the stepladder is executed. 34 can be installed in a stable state.
When the lock is released, the second leg 36 is also stretchable, so that the second leg 36 can be expanded and contracted by pushing or lifting the second leg 36 side of the stepladder 34. The stepladder 34 can be installed in a stable state by simultaneously adjusting the lengths of both the first leg 35 and the second leg 36.
Although not shown, the telescopic device 1 can be similarly installed for the pair of legs formed on the other side of the stepladder 34. In this case, the four legs of the stepladder 34 can be freely lengthened. Can be adjusted.

Here, in FIG. 8, when the internal structure of the telescopic device 1 installed on the stepladder 34 is viewed, the length of the first leg 35 of the stepladder 34 is adjusted inside the leg portion 2 of the telescopic device 1. One pulling spring 13 is inscribed, and a second pulling spring 18 for adjusting the length of the second leg 36 of the stepladder 34 is inscribed inside the first pulling spring 13. The stopper 21 of the locking portion 19 installed on the stepped platform 37 of the stepladder 34 is inserted from the stopper insertion window 23 to stab the spiral gap between the first tension spring 13 and the second tension spring 18. By doing so, the first tension spring 13 and the second tension spring 18 are locked, and the first leg 35 and the second leg 36 of the stepladder 34 are fixed.
Further, when the stopper 21 is pulled out and the locking is released, the first telescopic leg and the second telescopic leg of the telescopic device 1 connected to the first leg 35 and the second leg 36 of the stepladder 34. In conjunction with the expansion and contraction, the first pulling spring 13 and the second pulling spring 18 move in the leg portion 2 to change the position of the spiral gap disposed in the stopper insertion window 23. As shown in the drawing, since the spiral gap between the first tension spring 13 and the second tension spring 18 is narrow and numerous, the lengths of the first leg 35 and the second leg 36 of the stepladder 34 are as follows. Fine adjustment is possible.
Note that the third push spring 15a in the present embodiment has a semicircular shape that is convex outward rather than circular in cross section like the third push spring 15 shown in FIGS. Since the second tension spring 18 is inscribed inside the third push spring 15a, the second tension spring 18 is devised so that a space for the second tension spring can be widened. In the figure, similarly, the shape of the first tension spring 13 inscribed in the second tension spring 18 has a circular cross section, but the cross section may also be a semicircular shape convex outward.

  As described above, in this embodiment, the leg length of the stepladder 34 can be freely adjusted by a simple method, and the leg length can be adjusted in a stable manner by adjusting the length of the leg in accordance with the step. Scaffolds can be formed. In addition, since the fixing is strong, the work can be performed safely.

Next, the case where the expansion / contraction apparatus according to the present embodiment is combined will be described with reference to FIG. FIG. 9 is a conceptual diagram showing a table using a pair of expansion / contraction devices according to this embodiment.
9, parts that are the same as those illustrated in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted. The base 41 is formed by combining two pairs of expansion / contraction devices according to the present embodiment with an outer frame member 42a provided with four legs and an inner frame member 42b for reinforcement.
The two pairs of telescopic devices are bent so that the first telescopic legs 3 and the second telescopic legs 4 at the respective ends extend from the legs of the outer frame member 42a. Moreover, the leg end tool 40a is mounted | worn with these expansion-contraction legs.
Furthermore, the handles 20a and 20b provided in the substantially central part of the two pairs of telescopic devices are close to each other so that they can be operated almost simultaneously, and are not particularly limited to such an arrangement. .
In such a base 41, the four legs are placed on, for example, uneven ground, and adjusted with the outer frame member 42a of the base 41 so as to be horizontal with one hand, while the handle 20a, By placing a hand on 20b, the respective stoppers (not shown) can be stabbed into the pulling springs inside the first leg 2a and the second leg 2b.
In the expansion / contraction apparatus according to the present embodiment, it is possible to more easily and efficiently control the expansion / contraction of the legs by combining a plurality of the expansion / contraction apparatuses, which is particularly advantageous when leveling with a plurality of legs. In this embodiment, the extension device legs are arranged side by side, but the extension device may be crossed, and the number of extension devices to be combined is not limited to two pairs, but three or more pairs. It does not matter.

Next, a second embodiment of the telescopic device according to the present invention will be described with reference to FIGS. (In particular, corresponding to claims 8 and 9 )
FIG. 10 is a conceptual diagram of a telescopic device according to the second embodiment of the present invention.
In FIG. 10, the expansion / contraction device 51 is mainly composed of a hollow cylindrical leg 52, an expansion / contraction leg 54 connected to the leg 52, and a locking portion 55 for fixing the length of the expansion / contraction device 51. .
And the leg part 52 is equipped with the groove part 56 formed along the longitudinal direction of the leg part 52, and the stopper insertion window into which the stopper of the latching | locking part 55 is inserted although it is not illustrated in the inside. Includes a protrusion 57 that partially protrudes from the groove 56 and can slide on the groove 56, a tension spring 58 fixed to the protrusion 57 and corresponding to a length adjusting member, and a tension spring (not shown). 58 is connected via a slide member, and a push spring corresponding to the expansion / contraction member is provided. Reference numeral 53 denotes a leg cover, which is fixed to the leg 52 with a bolt 64 via a fixing member 63.
In addition, the extendable leg 54 is fixed to the protrusion 57. Although details of the fixing method will be described later, the protruding portion of the protruding portion 57 is fixed with a bolt 67 in a state where the protruding portion 57 is sandwiched between the first protruding portion fixing member 65 and the second protruding portion fixing member 66. Yes.
The locking portion 55 includes a handle 62 connected to a stopper (not shown) and a fixing member 60 that fixes the stopper and the handle 62 and is fixed to the leg portion 52. When the handle 62 is pushed, the stopper passes through the stopper insertion window provided in the leg portion 52 from the stopper insertion port 61 installed in the fixing member 60 and stabs the gap between the tension springs 58 located in the stopper insertion window. Thus, the movement of the tension spring 58 is suppressed.

Therefore, in the expansion / contraction device 51, when the protrusion 57 is slid upward of the groove 56, the expansion / contraction leg 54 fixed to the protrusion 57 moves together while interposing the leg 52, and the leg In the interior of 52, the pulling spring 58 moves upward in conjunction with the protrusion 57, and the pressing spring is compressed. Here, when the stopper is slid into the stopper insertion window at the locking portion 55 and the movement of the pulling spring 58 is restrained by piercing the gap of the pulling spring 58, the length from the upper end portion of the leg portion 52 to the protruding portion 57 is increased. In addition to determining the length, the length of the telescopic leg 54 can be determined.
On the contrary, when releasing the state in which the tension spring 58 is locked in the locking portion 55, the compressed push spring is extended and attached when the stopper stuck in the gap of the tension spring 58 is removed. Therefore, the tension spring 58 and the protrusion 57 automatically move downward, and at the same time, the telescopic leg 54 slides downward.
In FIG. 1, the leg cover 53 and the extendable leg 54 have a quadrangular cross section, but the shape is not particularly limited, and the leg cover 53 includes the extendable device 51, and the extendable leg 54 includes Any shape may be used as long as the telescopic device 51 can be inserted.
Further, although a load is applied to the leg portion 52, the strength is weakened as much as the groove portion 56 is provided. Therefore, a material having high strength is selected or reinforced by increasing the thickness. It is desirable.
Further, the telescopic legs 74 are not necessarily installed, and those other than the telescopic legs 74 that need to be fixed in position can be fixed to the protrusions 57.

Next, the internal structure of the telescopic device will be described with reference to FIGS.
FIG. 11 is a conceptual diagram showing the internal structure of the telescopic device according to the present embodiment provided with a fixing member and a locking portion, and FIG. 12 shows the interior of the legs in the telescopic device according to the present embodiment. It is a conceptual diagram which shows a structure.
11 and 12, in the telescopic device 51, as described above, the tension spring 58 and the push spring 59 are installed inside the leg portion 52 via the slide member 68. The lower end of the tension spring 58 is fixed to a tension spring fixture 57 a formed integrally with the protrusion 57, and the upper end is fixed to the lower side of the slide member 68. On the other hand, the lower end portion of the push spring 59 is fixed to the upper side of the slide member 68, and the upper end portion is fixed to a push spring fixture 69 provided at the upper end portion of the leg portion 52.
Further, the tension spring 58 is disposed up to a position above the stopper insertion window 70 provided in the leg portion 52, and the gap is always stabbed by the stopper 61 a of the locking portion 55 slidably inserted into the stopper insertion window 70. It can be done. The locking portion 55 is fixed to the leg portion 52 by a fixing member 60.

As described above, in FIG. 12, when the protrusion 57 is slid upward along the groove 56, the pull spring 58 and the slide member 68 move upward in conjunction with the protrusion 57, and the upper end It can be clearly seen that the push spring 59 to which the portion is fixed is configured to contract. Then, when the projection 57 is stopped at a desired position and the stopper is slid into the gap between the tension springs 58 arranged in the stopper insertion window 70, the movement of the projection 57, the tension spring 58 and the slide member 68 is suppressed. The length from the upper end of the leg 52 to the protrusion 57 is determined. Here, the tension spring 58 has a closely packed structure, and there are many gaps. Therefore, the gap corresponding to the stop position of the protrusion 57 can be stabbed, and the length of the leg 52 can be adjusted. Allows a desired length to be selected and allows fine adjustment.
In the present embodiment, the groove portions 56 are provided at two symmetrical positions of the leg portions 52, and the protruding portions 57 have shapes protruding on both sides of the groove portions 56. In this case, the sliding of the groove 56 by the protrusion 57 becomes smooth, and the vertical movement of the protrusion 57 becomes more accurate. However, the groove 56 is one place, and the groove 56 can be slid in one place. It is also possible to use protrusions having Or depending on the cross-sectional shape of the leg part 52, the groove part 56 may be provided in three places or four places, and the number of the groove parts 56 is not limited.

Next, a method for fixing the protrusion and the extendable leg will be described with reference to FIG.
Fig.13 (a) is a conceptual diagram of the fixing | fixed part of the protrusion part and expansion-contraction leg part of the expansion-contraction apparatus which concerns on this Embodiment, (b) is shown by the BB line in Fig.13 (a). FIG.
In FIG. 13A, below the leg portion 52, the first protrusion fixing member 65 and the second protrusion fixing member 66 surround the protrusion 57 protruding from the groove 56, and the protrusion 57 is Although not shown, the first protrusion fixing member 65 and the second protrusion fixing member 66 are arranged outside the first protrusion fixing member 65 and the second protrusion fixing member 66. These are fixed using the telescopic legs and bolts 67.
Further, in FIG. 13B, when the section in the fixed state is seen, the first protrusion fixing member 65 and the second protrusion fixing member 66 are in close contact with the protruding portion of the protrusion 57, and are firmly fixed. You can see that
Since the load is applied to the protrusion 57, the first protrusion fixing member 65, and the second protrusion fixing member 66 when the telescopic device is used, it is desirable to select a strong material.

In this embodiment configured as described above, since it has a simple structure, manufacturing and maintenance are easy, and the number of parts is small, so that cost reduction can be realized. In addition, since the tension spring is selected as the length adjusting member, the leg portion can freely move the projection portion to determine a desired length, and fine adjustment is possible.
Next, an example of the telescopic device according to the present embodiment will be described with reference to FIGS.

FIG. 14 is a conceptual diagram of the telescopic device according to the present embodiment.
14, the telescopic device 71 has a structure in which a first leg portion 72 and a second leg portion 73 are connected to each other, and is attached to a seat chair to adjust the angle of the back portion and the position of the seat portion. It can be performed.
The first leg portion 72 adjusts the angle of the back portion, and the details thereof will be described later. One end portion located at the bottom of the drawing has a curved hook shape, and the first leg portion 72 includes the first leg portion. A first pulling spring 75 fixed to a protrusion (not shown) is disposed beyond the first locking portion 78 and fixed to one end of the first slide member 77. The first leg 72 and the second leg 73 are joined at the position where the first slide member 77 is disposed, and the other end of the first slide member 77 has a second end. A pressing spring 76 installed inside the leg portion 73 is fixed.
Therefore, in the first leg 72, when the first protrusion (shown as 95 in FIGS. 15 and 16) is slid in a groove (not shown) formed in the first leg 72. The first tension spring 75 and the first slide member 77 are moved to compress the pressing spring 76. Here, when the first protrusion is in a desired position, the first locking portion 78 pushes the first handle 81 to remove the stopper (not shown) from the first stopper insertion port 80. When the sliding movement of the first pulling spring 75 is suppressed by slidingly inserting it into a stopper insertion window (not shown) provided on the one leg portion 72 to puncture the gap of the first pulling spring 75, the first protrusion The position of the part can be fixed.
Reference numeral 79 denotes a first fixing member, which is a member that fixes the first handle 81 and the stopper to the first leg portion 72.

On the other hand, the second leg 73 adjusts the position of the seat, and the details thereof will be described later in the same manner as the first leg 72, but the second groove 73 is provided at one end. (Not shown) having a second protrusion 82 slidable, formed integrally with the second protrusion 82, and installed in the second leg portion 73. A second tension spring 83 is fixed to the. The second tension spring 83 is disposed beyond the second locking portion 85 and fixed to one end portion of the second slide member 84, and the other end of the second slide member 84. A pressing spring 76 is fixed to the portion. Reference numeral 89 denotes a fixing member, which fixes the second protrusion 82 to a pedestal of a seat chair, which will be described later. Reference numeral 105 also denotes a fixing member, and the second leg 73 is described later. It is fixed to the seat of the seat.
Similarly to the first leg 72, when the second protrusion 82 is slid and moved in the second groove provided in the second leg 73, the second tension spring 83 and the second leg 83 are moved. Since the slide member 84 moves in conjunction with the second protrusion 82 and the push spring 76 contracts, the second handle 88 is pushed from the second stopper insertion port 87 in the second locking portion 85. When the stopper is slid and inserted into the gap of the second tension spring 83 to prevent the movement of the second tension spring 83, the position of the second protrusion 82 can be fixed. Reference numeral 86 denotes a second fixing member, which is a member for fixing the second handle 88 and the stopper to the second leg 73. Thus, in this embodiment, the first leg 72 and the second The leg portions 73 are connected to each other, and the push spring 76 serving as an expansion / contraction member is shared.

Here, the angle adjustment of a seat chair is demonstrated using FIG.15 and FIG.16.
FIG. 15 is a conceptual diagram of a seat chair equipped with the telescopic device according to the present embodiment.
In FIG. 15, the seat chair 90 is capable of adjusting the angle of the back portion 91 and the front and back positions of the seat portion 92, and has a bowl-shaped first leg with one end bent on the side surface. The part 72 is fixed to the lower base 97 of the seat 90 by three fixing members 93.
A first groove portion 94 is formed along a curve in the hook-shaped portion of the first leg portion 72, and the first protrusion portion 95 is slidably installed in the first groove portion 94. ing. In addition, the first protrusion 95 is fixed to the side surface of the back portion 91 of the seat 90, and when the back portion 91 is moved backward, the first protrusion 95 moves in the direction of the arrow 74. It has become.

As described above, the first leg portion 72 and the second leg portion 73 are connected to each other, and the first protrusion portion 95, the first tension spring, and the first leg portion are provided inside the first leg portion 72. The slide members are sequentially installed, and then, a push spring is installed inside the second leg portion 73 to be connected. Therefore, when the back portion 91 is tilted backward and the first projection portion 95 is moved. The first pulling spring and the first slide member also move together, and the push spring contracts because the other end is fixed.
Here, the back portion 91 is stopped at a desired angle, the first handle 81 is pushed at the first locking portion 78, and the first stopper 96 is slid into the stopper insertion window provided on the first leg portion 72. Thus, when the gap of the first pulling spring is stabbed, the angle of the back portion 91 can be determined.
On the other hand, when returning the back portion 91 that has been tilted backward, the first stopper 96 that pierces the gap of the first pulling spring is removed, and the locked state in the first locking portion 78 is changed. When released, the back portion 91 automatically returns to the front due to the elasticity of the contracted push spring.
Reference numeral 98 denotes a pulley installed on the lower base 97, and this pulley 98 slides in a groove provided on the base 99 and moves the seat chair 90 back and forth.

Next, FIG. 16 is a conceptual diagram showing a fixed portion of a seat chair equipped with the telescopic device according to the present embodiment.
In FIG. 16, when the seat chair is viewed from the front, the back frame 100 that is the framework of the back of the seat chair and the seat frame 101 that is the framework of the seat are connected and installed on the lower base 97. . The first leg 72 is also fixed to the lower base 97 by a fixing member 93 at a position adjacent to these frames, and the circular shape of the end portion of the bowl shape can be confirmed. A protrusion fixing member 102 is fixed to the back frame 100, and a first protrusion 95 is fixed to the protrusion fixing member 102 using a bolt 103.
Therefore, when the back frame 100 of the seat chair, that is, when the angle of the back is changed back and forth, the first protrusion 95 moves by sliding the groove provided in the first leg 72 in conjunction with the back. It has become.

Subsequently, the position adjustment of the seat will be described with reference to FIGS. 17 and 18.
FIG. 17 is a top view when the seat chair equipped with the telescopic device according to the present embodiment is moved forward, and FIG. 18 is moved rearward with the seat chair equipped with the telescopic device according to the present embodiment. FIG. 17 and 18, the same parts as those shown in FIG. 14 are denoted by the same reference numerals, and description of the configuration is omitted. Moreover, in FIG.17 and FIG.18, description of the back part is abbreviate | omitted.
In FIG. 17, the seat 90 is in a state in which the seat 92 is stopped at the front position of the pedestal 99, and in the second leg 73, the second protrusion 82 is connected to the second leg 73. It is located at an end portion of a second groove portion (not shown) provided, and inside the second leg portion 73, a second stopper insertion window (not shown) has a second locking portion 85. The second pulling spring located is stabbed by the stopper, the movement is restrained, and the position of the seat portion 92 is fixed.

When the seat portion 92 is moved rearward, the stopper of the second locking portion 85 is removed from the second pulling spring in FIG. 17 to release the locking state, and in FIG. When 92 is pushed backward, the second projecting portion 82 fixed to the pedestal 99 by the fixing member 89 stops and the second leg portion 73 fixed to the seat 92 by the fixing member 105 moves backward. Then, the second protrusion 82 slides along the second groove, and the second spring and the second slide member move and the push spring contracts inside the second leg 73. . Here, when the seat portion 92 is stopped at a desired position, and the second pulling spring located at the second stopper insertion window in the second locking portion 85 is stabbed by the stopper, locking is performed. The position of the seat 92 can be fixed.
In FIG. 18, when the stopper is removed and the locked state is released, the seat 92 is automatically moved forward by the elasticity of the contracted push spring.

Thus, in the present embodiment, even if the shape is bent like the first leg portion, the position of the protruding portion can be adjusted by installing the groove portion along the shape and the protruding portion that slides into the groove portion. Since the distance from the end portion of the leg portion to the projection portion can be determined by freely adjusting, it can be applied to a device having an angle adjustment like a seat chair.
In addition, when the push spring is shared by combining the leg portions, the structure is further simplified and the cost can be reduced by reducing the number of components.

  As described above, according to the first to fourth aspects of the present invention, it is possible to provide a telescopic device that can easily and simultaneously adjust a pair of legs to a desired length. Yes, it can be used in furniture such as tables with stepladders, ladders and pairs of legs.

It is a longitudinal cross-sectional view of the expansion-contraction apparatus which concerns on this Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the expansion-contraction mechanism of the 1st leg of the expansion-contraction apparatus which concerns on embodiment. It is a longitudinal cross-sectional view for demonstrating the expansion-contraction mechanism of the 2nd leg of the expansion-contraction apparatus which concerns on embodiment. It is a conceptual diagram which shows the latching | locking part of the expansion-contraction apparatus which concerns on embodiment. (A) is a top view of the stopper of the latching | locking part of the expansion-contraction apparatus which concerns on embodiment, (b) is arrow sectional drawing of the part shown by the AA line in Fig.5 (a). . (A) is a conceptual diagram which shows the state by which the stopper of the latching | locking part of the expansion / contraction apparatus which concerns on embodiment was cancelled | released, (b) is the stopper of the latching | locking part of an expansion / contraction apparatus of a 1st step. It is a conceptual diagram which shows the state which latched, (c) is a conceptual diagram which shows the state which the stopper of the latching | locking part of the expansion-contraction apparatus similarly performed the 2nd step of latching. It is a conceptual diagram of the stepladder equipped with the expansion-contraction apparatus which concerns on Example 1. FIG. It is a conceptual diagram which shows the internal structure of the stepladder equipped with the expansion-contraction apparatus which concerns on Example 1. FIG. It is a conceptual diagram which shows the case where the expansion-contraction apparatus which concerns on Example 2 is combined. It is a conceptual diagram of the expansion-contraction apparatus which concerns on the 2nd Embodiment of this invention. It is a conceptual diagram which shows the internal structure of the state provided with the fixing member and the latching | locking part in the expansion-contraction apparatus which concerns on the 2nd Embodiment of this invention. It is a conceptual diagram which shows the internal structure of a leg part in the expansion-contraction apparatus which concerns on 2nd Embodiment. . (A) is a conceptual diagram of the fixing | fixed part of the projection part and expansion-contraction leg of the expansion-contraction apparatus which concerns on 2nd Embodiment, (b) is a part of the part shown by the BB line in Fig.13 (a). It is arrow sectional drawing. It is a conceptual diagram of the expansion-contraction apparatus which concerns on Example 3. FIG. It is a conceptual diagram of the seat chair equipped with the expansion-contraction apparatus which concerns on Example 3. FIG. It is a conceptual diagram which shows the fixing | fixed part of the seat chair equipped with the expansion-contraction apparatus which concerns on Example 3. FIG. It is a top view at the time of moving the seat chair equipped with the expansion-contraction apparatus which concerns on Example 3 ahead. It is a top view at the time of moving the seat chair equipped with the expansion-contraction apparatus which concerns on Example 3 back.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Telescopic device 2 ... Leg part 2a ... 1st leg 2b ... 2nd leg 3 ... 1st telescopic leg 4 ... 2nd telescopic leg 5 ... 1st push spring 6 ... Lower end tool 7 ... Push spring fixation Tool 8 ... Second push spring 9 ... Lower end tool 10 ... Push spring fixing tool 11 ... First cylinder 12 ... First piston 13 ... First pulling spring 14 ... Connecting tool 15, 15a ... Third push spring DESCRIPTION OF SYMBOLS 16 ... 2nd cylinder 17 ... 2nd piston 18 ... 2nd tension spring 19 ... Locking part 20,20a, 20b ... Handle 21 ... Stopper 22 ... Fixing member 23 ... Stopper insertion window 24 ... Bolt 25 ... Gap 26 ... Bolt hole 27 ... Cover 28 ... Handle base 29 ... Fixing tool 30 ... Notch 31 ... First blade 32 ... Second blade 33 ... Bolt hole 34 ... Stepladder 35 ... First leg 36 ... Second leg 37 ... Step board 38 ... Ground 39 ... Step 40, 40a ... Leg end DESCRIPTION OF SYMBOLS 1 ... Base 42a ... Outer frame material 42b ... Inner frame material 43 ... Fixed ring 51 ... Telescopic device 52 ... Leg part 53 ... Leg part cover 54 ... Telescopic leg 55 ... Locking part 56 ... Groove part 57 ... Projection part 57a ... Pulling spring Fixing tool 58... Pulling spring 59... Pushing spring 60... Fixing member 61. Stopper insertion port 61 a. Stopper 62... Handle 63 ... Fixing member 64 ... Bolt 65 ... First protrusion fixing member 66. 67 ... Bolt 68 ... Slide member 69 ... Push spring fixture 70 ... Stopper insertion window 71 ... Telescopic device 72 ... First leg 73 ... Second leg 74 ... Arrow 75 ... First pull spring 76 ... Push spring Reference Signs List 77 ... first slide member 78 ... first locking portion 79 ... first fixing member 80 ... first stopper insertion port 81 ... first handle 82 ... second protrusion 82a ... tension spring fixture 83 ... Second pulling spring 84 ... second slide member 85 ... second locking portion 86 ... second fixing member 87 ... second stopper insertion port 88 ... second handle 89 ... fixing member 90 ... seat chair 91 ... Back part 92 ... Seat part 93 ... Fixing member 94 ... First groove part 95 ... First projection part 96 ... First stopper 97 ... Lower base 98 ... Pulley 99 ... Base 100 ... Back part frame 0 101 ... Seat part frame 102 ... Projection fixing member 103 ... bolt 104 ... groove 105 ... fixing member

Claims (9)

  A leg portion having a window portion in a part of the hollow tube, a first telescopic leg portion that can slide by inserting one end portion of the leg portion, and a slide portion that can slide by inserting the other end portion of the leg portion. A second telescopic leg, and a pull formed in a spiral shape with one end fixed to a first slide member provided in one end of the leg and slidable inside the leg. A first length adjusting member constituted by a spring and a second slide member provided at the other end of the leg and slidable inside the leg are fixed at one end and spiraled. A second length adjusting member constituted by a tension spring formed in a shape, and locking the first length adjusting member and the second length adjusting member at the window portion provided in the leg portion A locking portion that slides from the window portion, and the first length adjusting member and the second length. A locking member that stabs the adjusting member to prevent movement of the first length adjusting member and the second length adjusting member, and the locking member is fixed to the window portion provided on the leg portion. A telescopic device comprising: a fixing member that performs the above operation.   A leg portion having a window portion in a part of the hollow tube, a first telescopic leg portion that can slide by inserting one end portion of the leg portion, and a slide portion that can slide by inserting the other end portion of the leg portion. A second telescopic leg, one end of the leg, a first telescopic member interposed in the first telescopic leg, the other end of the leg and the second telescopic A second elastic member interposed in the leg portion, and a first slide member which is provided in one end portion of the leg portion and is slidable inside the leg portion, and one end portion is fixed and spiraled. One end of a first length adjusting member configured by a tension spring formed in a shape and a second slide member provided at the other end of the leg and slidable inside the leg A second length adjusting member constituted by a tension spring having a portion fixed and formed in a spiral shape, and the first length adjusting portion in the window provided in the leg portion And a locking portion for locking the second length adjusting member, and the locking portion is slidably inserted from the window portion, and the first length adjusting member and the second length are inserted. A locking member that stabs the adjusting member to prevent movement of the first length adjusting member and the second length adjusting member, and the locking member is fixed to the window portion provided on the leg portion. A telescopic device comprising: a fixing member that performs the above operation.   A leg portion having a window portion in a part of the hollow tube, a first telescopic leg portion that can slide by inserting one end portion of the leg portion, and a slide portion that can slide by inserting the other end portion of the leg portion. A second telescopic leg, and a pull formed in a spiral shape with one end fixed to a first slide member provided in one end of the leg and slidable inside the leg. A first length adjusting member constituted by a spring; a guide member connected to the other end of the first length adjusting member and extending to the other end of the leg; and the leg A second length adjustment comprising a tension spring formed in a spiral shape with one end fixed to a second slide member provided inside the other end and slidable inside the guide member A latch that latches the first length adjusting member and the second length adjusting member in the member and the window portion provided in the leg portion The locking portion is slid from the window portion and stabs the first length adjusting member and the second length adjusting member, and the first length adjusting member and A telescopic device comprising: a locking member that suppresses movement of the second length adjusting member; and a fixing member that fixes the locking member to the window portion provided on the leg portion.   A leg portion having a window portion in a part of the hollow tube, a first telescopic leg portion that can slide by inserting one end portion of the leg portion, and a slide portion that can slide by inserting the other end portion of the leg portion. A second telescopic leg, one end of the leg, a first telescopic member interposed in the first telescopic leg, the other end of the leg and the second telescopic A second telescopic member interposed in the leg portion, and a first slide member which is provided in one end portion of the leg portion and is slidable inside the leg portion, and one end portion is fixed and spiraled. A first length adjusting member constituted by a tension spring formed in a shape, and a guide connected to the other end of the first length adjusting member and extending to the other end of the leg A tension spring formed in a spiral shape with one end fixed to a member and a second slide member provided inside the other end of the leg and slidable inside the guide member A second length adjusting member configured to be configured, and a locking portion for locking the first length adjusting member and the second length adjusting member in the window portion provided in the leg portion. The locking portion is slid from the window portion and stabs through the first length adjusting member and the second length adjusting member to stab the first length adjusting member and the first length adjusting member. A telescopic device comprising: a locking member that suppresses the movement of the length adjusting member 2; and a fixing member that fixes the locking member to the window portion provided on the leg portion.   The expansion / contraction apparatus according to claim 3 or 4, wherein the guide member is configured by a spiral spring. One at least one of said first tension spring or the compression spring is formed in a spiral which constitute the length adjustment member, said second tension spring formed in a spiral shape which constitute the length adjustment member 6. A telescopic device according to claim 5, wherein the spiral direction is a different direction.   The expansion device according to any one of claims 1 to 6, wherein the locking member has a flat plate shape having a notch.   A leg portion having a window portion and a groove portion formed along a longitudinal direction of the hollow tube in a part of the hollow cylinder, and a portion that is disposed inside the leg portion and protrudes from the groove portion and slides on the groove portion. A length adjustment member constituted by a protrusion that can slide inside the leg, a tension spring fixed to the protrusion and formed in a spiral shape, and connected to the length adjustment member via a slide member And a locking portion for locking the length adjusting member in the window portion provided in the leg portion, and the locking portion is slid and inserted from the window portion to the length. A telescopic member comprising: a locking member that stabs the adjusting member to prevent the movement of the length adjusting member; and a fixing member that fixes the locking member to the window portion provided in the leg portion. apparatus.   The expansion / contraction apparatus according to claim 8, further comprising an expansion / contraction leg portion fixed to the projecting portion and slidable by inserting the leg portion.