JP4384003B2 - Gas spring operating device for chair - Google Patents

Description

  The present invention relates to an operating device for operating a gas spring for adjusting the height of a seat provided in a chair or adjusting the tilt angle of a backrest.

As a conventional device of this type, there is an apparatus in which an operation lever for operating a gas spring for adjusting a tilt angle of a seat and a backrest is provided at one side lower part of the seat (seat) (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 7-21140

  However, in the conventional apparatus as described above, since the operation lever and the support body that pivots the operation lever are incorporated in the seat, not only the thickness of the seat has to be increased, but also the assembly is troublesome. However, there is a problem that the cushion member of the seat must be removed each time when connecting work such as a wire or maintenance of the operation lever.

  In view of the above-described problems of the prior art, the present invention can easily and quickly assemble the operation lever and its linking means without affecting the seat, and perform maintenance and the like. An object of the present invention is to provide a gas spring operating device in a chair that can be used.

According to the present invention, the above problem is solved as follows.
(1) In a chair in which the seat is supported by a support base supported by legs, and the front ends of the lower portions of a pair of left and right back support heels that support the backrest are attached to both sides of the support base, A protrusion facing in the direction perpendicular to the longitudinal direction is provided on one of the lower side surfaces of the back support ridge , and this protrusion is linked to an operation part of a gas spring that regulates the movement of the movable part provided in the chair. Provide an operation lever.

In (2) above (1) section, provided with a window hole penetrating in the lateral direction to the collision portion, into the window hole and pivoted with an axis facing the operating lever front-back direction.

  (3) In the above item (2), a box is fitted into the window hole, and an operation lever is pivotally attached to the box.

  (4) In any one of the above items (1) to (3), the linking means for linking the operating portion of the gas spring and the operating lever is connected to the operating lever that can push the push valve in the operating portion of the gas spring. Are connected to the operation lever across the backrest support rod from the inside of the backrest support rod, the wire is inserted so as to be slidable in the axial direction, and one end is a gas spring. The wire unit is composed of an outer surface of the operation portion and a back support rod or a flexible tube fixed to a member integral therewith.

  (5) In any of the above items (1) to (4), when the gas spring is provided in the telescopic leg and the push valve is in the inoperative position, the leg cannot be telescopic. The seat is designed to adjust the height of the seat so that the leg can be expanded and contracted by being pushed to the operating position.

  (6) In any of the above items (1) to (5), the gas spring is connected to the support base at one end, and the other end of the arm portion that rotates together with the backrest support rod. The tilt angle adjustment of the backrest that can be expanded and contracted by moving the push valve provided at one end to the operating position and that cannot be expanded and contracted by returning the push valve to the inoperative position For use.

  (7) In any one of the above items (1) to (6), an operating lever for operating a gas spring for adjusting the seat height is provided on one of the pair of left and right backrest support rods, and the other An operation lever for operating a gas spring for adjusting the tilt angle of the backrest is provided on the backrest support rod.

According to the present invention, the following effects can be achieved.
(1) According to the first aspect of the present invention, since the operation lever linked to the operation portion of the gas spring is provided on the side surface of the backrest support rod, the operation lever and its linking means are provided without affecting the seat. Can be assembled easily and quickly, and maintenance and the like can be performed without removing the cushion body of the seat.

  (2) According to the invention described in claim 2, since the protrusion is provided in a part of the back support ridge, the window hole is provided in the protrusion, and the operation lever is pivotally mounted in the window hole. Without lowering the strength of the heel, a window hole for attaching an operation lever can be provided in the back support heel.

  (3) According to the invention described in claim 3, in a state where the operation lever is mounted on the box body, the operation lever can be easily and easily mounted on the back support rod by simply fitting the box into the window hole of the back support rod. Can be assembled quickly.

  (4) According to the invention described in claim 4, the operation portion of the gas spring and the operation lever can be easily and quickly connected by the wire unit. In particular, the operation lever can be connected to a wire by using the space inside the back support ridge so that the connecting operation is not hindered by the seat, and the seat cushion body as in the prior art. There is no need to remove.

  (5) When the gas spring is used for adjusting the seat height as in the fifth aspect of the invention, since the operation portion and the operation lever of the gas spring are close to each other, the linking means such as a wire unit is provided. Can be shortened.

  (6) When the gas spring is used for adjusting the tilt angle of the backrest as in the sixth aspect, the backrest can be stopped steplessly at an arbitrary tilt angle.

  (7) According to the invention described in claim 7, the left and right backrest support rods can be effectively used to provide the operation levers for each, and the gas springs having different functions can be operated by the operation levers. Also, the two operation levers can be arranged with good balance.

Hereinafter, a reclining chair provided with one embodiment of the present invention is explained with reference to an accompanying drawing.
As shown in FIGS. 1-3, this reclining chair is provided with the leg body (3) which has the five leg rods (2) which make | form the radial shape by which the caster (1) was provided in the front-end | tip part. A telescopic leg column (5) having a gas spring (4) is erected at the center of the leg body (3), and a movable part for the leg body (3) is provided at the upper end of the leg column (5). The rear part of the supporting base (6) is fixed.

  The support base (6) has a substantially hollow box-shaped support basic body (6a) having a rhombic shape in plan view and opened on the upper surface of the front half extending toward the front upper side, and the opening on the upper surface of the front half is It is covered with a removable upper cover (7). A pair of left and right sides of the support basic body (6a) that extend diagonally upward toward the left and right sides of the front part of the support base body (6a) and whose top end face is located above the support base body (6a). The arms (6b) and (6b) are integrally formed.

  Near the center of the support base (6a) in the front-rear direction, there is a pivot (8) that faces the left and right sides with square shafts (8a) (8a) at both ends. The corner shafts 8a and 8a on both ends of the pivot shaft 8 projecting to both sides are located in front of the pair of left and right back support rods 10 and 10 that support the backrest 9. A cylindrical portion (10a) (10a) facing the left and right direction formed at the front end of the lower portion is fixed, and the pivot (8), the backrest support rods (10) (10), and the backrest (9) Centering on the axis of the pivot (8), they can be integrally rotated with respect to the support base (6).

The support base (6) is provided with a biasing means (A) for biasing the backrest (9) in a direction to stand up via the pivot (8) and the backrest support rods (10), (10). Yes.
As shown in FIG. 3, the urging means (A) is a rotational urging force comprising two rubber torsion springs (11) and (11) for urging the pivot (8) counterclockwise in FIG. The gas spring unit (D) including the means (B), the biasing force adjusting means (C) (see FIGS. 7 and 11), and the gas spring (12) is provided.
The urging means (A) will be described in detail later, and first, the schematic configuration of the entire reclining chair will be briefly described.

  The lower surfaces of the left and right rubber torsion springs (11), (11) are covered with a pair of left and right lower covers (13), (13) that are detachably provided on the lower surface of the support basic body (6a).

  As shown in FIGS. 3 to 6, the left and right back support rods (10) and (10) have a portion slightly behind the pivot (8) in the upper direction perpendicular to the longitudinal direction of each back support rod (10). The short projections (10b) and (10b) facing each other are provided, and at the upper end of each projection (10b) is a pair of left and right seats facing the front and rear directions that support both sides of the seat (14) The rear ends of the receiving frames (15) and (15) are connected to each other with a shaft (16) facing in the left-right direction.

The front part of each seat frame (15) has a box shape with an open top surface and extends downward, and its lower end surface forms an inclined surface (17) inclined downward and downward, and the inclined surface ( 17) A standing wall (18) facing the rear upper side is formed continuously to the rear end.
Each inclined surface (17) is slidably mounted in the front-rear direction on an inclined receiving surface (19) formed on the upper surface of the tip of the arm portion (6b) of the support base (6) and inclined downward. Has been.

The inclined surface (17) is separated from the inclined receiving surface (19) upward between the tip of the arm (6b) of the support base (6) and the front portion of the seat receiving frame (15). A stop means (20) for blocking is provided.
In this example, the detachment prevention means (20) includes a long hole (21) facing the front-rear direction provided on the inclined surface (17) and a protrusion provided on the inclined receiving surface (19) and is slid into the long hole (21). It has a headed shaft (22) that is movably fitted and has an enlarged head (22a) that is larger than the width of the long hole (21). 19) and the headed shaft (22) may be provided on the inclined surface (17). In the illustrated example, the portion corresponding to the shaft portion of the headed shaft (22) is a vertical plate shape facing the front-rear direction, but this may be a circular shaft.

  The long hole (21) extends rearward from the vicinity of the front end of the inclined surface (17), and the rear end opens rearward from the standing wall (18). The standing wall (18) has an opening (23) through which the enlarged head (22a) of the headed shaft (22) communicates with the long hole (21) and projects (19) on the inclined receiving surface. Is provided.

  Accordingly, the inclined surface (17) is slid rearward along the inclined receiving surface (19) while introducing the headed shaft (22) from the opening (23), and the rear end of each seat receiving frame (15) Assemble each seat frame (15) to the support base (6) and the backrest support rod (10) easily and quickly by connecting the part to the backrest support rod (10) with the shaft (16). be able to.

  After the assembly, the seat back frame (15) and the seat (14) supported by the backrest (9) are moved from the state shown in FIG. As shown in FIG. 5, the inclined surface (17) is moved rearward and downward while sliding along the inclined receiving surface (19).

The movement of the backrest (9) and the seat (14) at this time causes the angle between the back and the thigh of the seated person and between the thigh and the lower leg to naturally expand, and the lower leg The part is gently tilted backwards with the heel of the foot in contact with the floor as the center, so that the seated person can have a comfortable and comfortable movement.
In addition, when the backrest (9) is moved from the rearward tilted state to the standing state, the seat (14) moves in the opposite direction to the above, and at this time, the seated person feels comfortable and comfortable to move. Can be given.

  If the inclined surface (17) and the inclined receiving surface (19) are completely straight when viewed from the side, the seat (14) moves rearward and downward in conjunction with the backward inclination of the backrest (9). The contact surface may change from surface contact to line contact, but the inclined surface (17) and the inclined receiving surface (19) should be gently curved so that they always contact in a wide range. desirable.

  The seat (14) is a stretchable stretch material made of, for example, a mesh frame using a stretchable fiber, a fabric such as a plain woven fabric, or a synthetic resin film or the like on a seat frame (14a) having a substantially rectangular frame shape in plan view. When the seated person sits down, the upholstery material (14b) expands, and the central part of the seat surface is recessed downward along the buttocks of the seated person. Since the central part of the material (14b) sinks, a comfortable seating feeling can be given to the seated person.

  In order to allow the central part of such a seat (14) to sink when seated, the upper surface of the tip of the pair of left and right arms (6b) (6b) and the backrest support rod (10) ( 10) and the protrusions (10b) and (10b) support the four corners of the seat frame (14a) higher than the support base (6). A space (24) is formed between the upper surface of 6a) so that the center of the lower surface of the seat (14) can bend downward.

  The backrest (9) also has a stretchable material (9b) having the same elasticity as the above-mentioned upholstery material (14b) on the backrest frame (9a) having a substantially rectangular frame shape when viewed from the front in accordance with the seat (14). It is formed by stretching.

The seat (14) is mounted on the pair of left and right seat receiving frames (15) and (15) so that the front / rear position can be adjusted, but the specific configuration therefor is not directly related to the present invention. Such illustration and description are omitted.
If the seat (14) is not adjusted in the front-rear position, the rear portion of the seat (14) is directly projected on the left and right backrest support rods (10) (10) with the shaft (16) (10b) ( The lower surface of the front portion of the seat (14) may be attached to the upper surface of the tip portions of the left and right arms (6b) and (6b) so as to be slidable in the front-rear direction.

    Each backrest support ridge (10) is provided with an armrest (25), which is not directly related to the present invention, and therefore detailed illustration and description thereof will be omitted.

Next, the details of the urging means (A) will be described with reference to FIGS. 3 and 7 to 11.
As shown in FIG. 7, the urging means (A) includes two urging urging means (B) comprising two rubber torsion springs (11) and (11) provided at the lower part of the support base (6), and A biasing force adjusting means (C) provided on the upper part of the support base (6) and a gas spring unit (D) including a gas spring (12) are provided.

As shown in FIGS. 8 and 9, an arm portion (26) facing substantially downward is provided at the central portion of the pivot (8) so as to be orthogonal thereto, and rubber torsion springs ( 11) (11) is provided.
Each rubber torsion spring (11) includes an outer cylinder (27) having a pivot shaft (8) as a core and being concentric with the pivot shaft (8) and being prevented from rotating on a support base (6). It is filled between (27) and the pivot (8), and the pivot (8) is rotated around the central axis with respect to the outer cylinder (27), thereby elastically deforming and returning to the pivot (8). And an elastic body (28) such as rubber which is adapted to impart rotational power.

  Bearings (29) and (29) having positioning protrusions (29a) provided at the center of the upper surface are fitted on both sides of the pivot (8) protruding outward from each rubber torsion spring (11). .

  A semi-cylindrical portion (6c) is formed in the lower center of the support basic body (6a) so as to face in the left-right direction and open at the bottom surface. A pair of left and right lower covers (13) and (13) having a cylindrical shape are attached with set screws (30) and (30) (see FIG. 10).

  The left and right rubber torsion springs (11) and (11) are connected to the pivot shaft (8) and the pair of left and right rubber torsion springs (11) and (11) and the outer bearings (29 and 29). The semi-cylindrical portion (6b) and the lower cover (13) (13) are loosely fitted in the concave portions (31) and (32) formed in the facing portion, and the outer bearings (29) and (29) are the semi-cylindrical portions (6b) and the lower covers (13) and (13) (see FIG. 10), and both sides of the pivot (8) projecting further outward from the bearings (29) and (29) are semi-cylindrical portions (6b ) And the lower cover (13) and (13) are inserted into the semicircular cutouts (33) and (34) provided on opposite edges of both sides (see FIG. 9), and the support base (6) It is accommodated between the semi-cylindrical part (6b) and the lower covers (13) (13).

At the lower end of the arm (26) that hangs down between the left and right lower covers (13) (13), the rear lower end of the gas spring (12) that faces front and upward is a shaft (35 ). The arm portion (26) is a movable portion with respect to the support base (6) together with the backrest support rod (10) and the backrest (9).
The front upper end of the gas spring (12) has a head cover (36) and a shaft (37) facing in the left-right direction, and is connected to the center of the front end of the support basic body (6a).
When the push valve (12a) provided at the front end of the gas spring (12) is pushed to the operating position, the gas spring (12) is urged to expand by the internal gas pressure and the urging force of the built-in auxiliary spring. This is a known type in which expansion and contraction becomes impossible when the push valve (12a) is returned to the inoperative position.

  As shown in FIG. 8, in the head cover (36) that forms the operating portion of the gas spring (12), the upper end of the operating lever (38) facing the substantially vertical direction for pushing the push valve (12a) is provided. It is pivotally mounted with a shaft (38a) that faces in the left-right direction, and the lower end of the operating lever (38) that protrudes forward and downward from the head cover (36) is a flexible member in the wire unit (39) that is the linking means. One end of a wire (41) inserted in the tube (40) so as to be slidable in the axial direction is fixed.

  As shown in FIG. 12, one end of the tube (40) is fixed to the right side surface of the bracket (42) fixed to the lower surface of the head cover (36), and the wire (41) extending leftward from the terminal is The direction is changed forward and upward along a quarter arc-shaped guide portion (42a) provided on the lower surface of the bracket (42), and the front upper end thereof is fixed to the operating lever (38). .

The other end of the wire (41) in the wire unit (39) protrudes from the operation lever (56) facing outward and pivotally attached to the middle part of the protrusion (10b) of the right backrest support rod (10). Through the window hole (57) provided in the intermediate portion of the portion (10b), the backrest support rod (10) is connected from the inner side.
As shown in FIG. 13, specifically, the operation lever (56) is pivoted with an axis (59) facing substantially in the front-rear direction on the upper portion of the box (58) fitted into the window hole (57) from the outside. It is worn.

  On the outer periphery and the upper and lower surfaces of the box (58), a flange (60) that is in contact with the outer surface of the protrusion (10b) of the support rod (10), and an inner surface of the protrusion (10b) Elastic engagement claws (61) (62) adapted to engage with each other, and when the box (58) is fitted into the window hole (57) from the outside, the protrusion of the support rod (10) At the same time that the flange comes into contact with the outer surface of the portion (10b), the elastic engagement claws (61) and (62) engage with the inner surface of the projection (10b), and the box (58) 57) is prevented from coming off.

  A tube mounting piece (63) is provided at the inner end of the box (58), and the other end of the tube (40) in the wire unit (39) extending from the inside of the chair is stopped here. It is worn.

By this wire unit (39), the operating lever (38) is linked to the operating lever (56), and when the operating lever (56) is pulled upward and outward, the operating lever (38) moves the push valve (12a) to the operating position. When the operation lever (56) is released, the operating lever (38) and the operating lever (56) return to the original inoperative position due to the return force of the push valve (12a) to the inoperative position. It can be restored.
The operating lever (56) may be provided with a spring (not shown) for returning to the inoperative position.

  A gas spring unit (D) is formed by the gas spring (12), the arm portion (26), the shafts (35) and (37), the head cover (36), and the like. The gas spring unit (D) acts to assist the urging force of the rotation urging means (B) when the push valve (12a) is in the operating position, and also to push the push valve (12a). By setting the inoperative position, the backrest (9) can be stopped steplessly at an arbitrary inclination angle.

  As shown in FIG. 11, the urging force adjusting means (C) for adjusting the initial urging force of the rotation urging means (B) is pivotally supported substantially at the upper center of the support basic body (6a). The left and right sides have a forward thread part (43) and a reverse thread part (44), and project outward from the support base body (6a) .In this example, the operation handle ( 45) and a pair of left and right movements having an operating shaft (46) facing left and right, and female screw holes (47) and (48) screwed into the forward screw portion (43) and the reverse screw portion (44). The pieces (49) and (50) and the rear end (base end) face the left and right direction connecting the outer peripheries of the outer cylinders (27) and (27) of the left and right rubber torsion springs (11) and (11). A connecting rod (52) facing the front connected to the shaft (51), a rear end portion is connected to each moving piece (49) (50) with a shaft (53) pointing up and down, and a front end portion is a connecting rod. It is connected to the front end (tip) of (52) and interlocked with the rotation of the operation shaft (46) to form a cross-sectional shape in plan view. By opening and closing, the pair of links (54) is configured such that the connecting rod (52) is moved in the front-rear direction to rotate the left and right outer cylinders (27), (27) around the central axis. ) (55).

In this example, the front end of the connecting rod (52) is supported by the support base body (6a) so as to be slidable in the front-rear direction, and the front end of the base piece (52a) facing forward in the connecting rod (52). The side protrusions (52b) having a backward U-shape when viewed from the side are provided, and at the inner corners of the side protrusions (52b) and the base pieces (52a), the links (54) (55) The front end is merely brought into contact so as to be rotatable about a vertical axis.
Even in such a configuration, the urging force of the rubber torsion springs (11) and (11) always acts to pull the connecting rod (52) backward, and a pair of left and right forming a C shape in plan view. Since the front ends of the links (54) and (55) are always positioned inward from the rear ends thereof, the front ends of the left and right links (54) and (55) are connected to the side protrusions (52b). It does not come off outward from the inner corner with the base piece (52a).

  However, the front end of each link (54) (55) is parallel to the vertical axis (53) connecting the rear end of each link (54) (55) to each moving piece (49) (50). These shafts (not shown) may be pivotally attached to the tip of the connecting rod (52).

  Thus, when the operation shaft (46) is rotated by the operation handle (45), the pair of moving pieces (49) and (50) move toward and away from each other, and accordingly, a pair of links (54) forming a letter C shape. (55) opens and closes to each other, and the connecting rod (52) is moved rearward and forward, whereby the outer cylinders (27) and (27) are rotated around the pivot axis, and the rotation urging means (B) As a result, the overall strength of the backrest (9) is weakened or strengthened accordingly.

The operation handle (45) at this time can be easily operated by the seated person in the seated posture and reaching out below the right side of the seat (14).
In this example, the pair of moving pieces (49) and (50) come close to each other, and the pair of links (54) and (55) forming a C-shape move in a direction to close each other. Since the biasing force of the biasing means (B) is set so as to increase, the amount of forward movement of the connecting rod (52) per rotation of the operating shaft (46) gradually decreases, and the expected backrest is assumed. Even if the force becomes large, the rotational resistance of the operating shaft does not increase, and the operating handle can be operated with light power all the time.

The middle part of the protrusion (10b) of the left backrest support collar (10) is the same as that provided at the intermediate part of the protrusion (10b) of the right backrest support collar (10) described above. A window hole (57), a box (58), an operation lever (56) and the like are provided symmetrically with the right one.
As shown in FIG. 7, one end of the wire (65) in the wire unit (64) shorter than the wire unit (39) is fixed to the left operation lever (56).

  The wire (65) is slidable in the axial direction in a flexible tube (66) having one end fixed to a tube mounting piece (63) (see FIG. 13) in the left box (58). Is inserted through.

As shown in FIG. 14, the other end of the tube (66) is a cylindrical operation part case (fitting) in a circular hole (67) facing the up-down direction provided at the center of the rear part of the support basic body (6a). 68) and is fixed to the tube mounting piece (69) standing up from the upper end edge.
The other end of the wire (65) extending from the other end of the tube (66) has an L-shaped front shape pivotally attached to the lower part in the operation portion case (68) with a shaft (70) facing in the front-rear direction. The operating lever (71) is fixed to the upper end portion of the upward arm portion (71a).

  The distal end portion of the lateral arm portion (71b) extending sideways at a right angle from the lower end of the upward arm portion (71a) in the operating lever (71) is a leg spring (5) gas spring for expansion and contraction ( 4) is located immediately above the push valve (4a) provided at the upper end of 4). When the wire (65) is pulled by the operation of the operation lever (56), the operation lever (71) is shown by a solid line in FIG. As indicated by the imaginary line, the push valve (4a) can be turned from the inoperative position shown in FIG.

  The gas spring (4) is a known one similar to the gas spring (12) described above. When the push valve (4a) is located at the inoperative position shown by the solid line in FIG. When the push valve (4a) is pushed down to the inoperative position indicated by the imaginary line, the push valve (4a) can be expanded and contracted. Acts to raise.

  As is clear from the above, according to the gas spring operating device in the chair of the present invention, the operating lever (56) linked to the operating portion of the gas springs (4) (12) is provided on the side surface of the back support rod (10). Therefore, without affecting the seat (14), the operating lever (56) and its linking means (wire unit (39) (64)) etc. can be assembled easily and quickly, and the seat ( Maintenance and the like can be performed without removing the cushion body of 14).

  Further, as in the above embodiment, an operation lever for operating a gas spring for adjusting the seat height is provided on one of the pair of left and right backrest support rods, and the other backrest support rod is provided with a backrest support rod. When operating levers that operate the gas springs for adjusting the tilt angle of the tilt are provided, the left and right backrest support rods are used effectively, and each is provided with an operating lever. Can be operated. Also, the two operation levers can be arranged with good balance.

It should be noted that the present invention can be implemented in many different forms without departing from the scope of the present invention.
For example, the operation lever (56) may be directly pivotally attached to the outer surface of the backrest support rod (10) with an axis that points in the front-rear direction or the vertical direction.

It is a front view of a chair provided with one embodiment of the present invention. Similarly, it is a side view. Similarly, it is an exploded perspective view of a main member. Similarly, it is an enlarged side view of the main part when the backrest is in the standing position. Similarly, it is an enlarged side view of the main part when the backrest is tilted backward. Similarly, it is the fragmentary top view which follows the VI-VI line of FIG. Similarly, it is an exploded perspective view of the tilting device of the backrest. Similarly, it is a central longitudinal side view of the support base. Similarly, it is a longitudinal cross-sectional front view along the IX-IX line of FIG. Similarly, it is a longitudinal side view along the line XX in FIG. Similarly, it is a cross-sectional plan view which follows the XI-XI line of FIG. Similarly, it is the XII-XII arrow line view of FIG. Similarly, it is an expanded sectional view which follows the XIII-XIII line of FIG. Similarly, it is an enlarged vertical front view along the XIV-XIV line of FIG.

Explanation of symbols

(A) Energizing means
(B) Rotating biasing means
(C) Force adjusting means
(D) Gas spring unit
(1) Casters
(2) Legs
(3) Leg
(4) Gas spring
(5) Pillar
(6) Support base (movable part)
(6a) Support base
(6b) Arm
(6c) Semi-cylindrical part
(7) Top cover
(8) Axis (core material)
(8a) Square shaft
(9) Backrest
(9a) Backrest frame
(9b) Upholstery material
(10) Back support
(10a) Tube part
(10b) Projection
(11) Rubber torsion spring
(12) Gas spring
(12a) Push valve
(13) Bottom cover
(14) Seat
(14a) Seat frame
(14b) Upholstery material
(15) Seat support frame
(16) axis
(17) Inclined surface
(18) Standing wall
(19) Inclined bearing surface
(20) Stop prevention means
(21) Long hole
(22) Headed shaft
(22a) Expanded head
(23) Opening
(24) Empty space
(25) Armrest
(26) Arm (movable part)
(27) Outer cylinder
(28) Elastic body
(29) Bearing
(29a) Projection
(30) Set screw
(31) (32) Recess
(33) (34) Notch
(35) axis
(36) Head cover (operation unit)
(37) axis
(38) Actuating lever
(38a) shaft
(39) Wire unit (linkage means)
(40) Tube
(41) Wire
(42) Bracket
(42a) Guide part
(43) Forward thread
(44) Reverse thread
(45) Operation handle
(46) Operation axis
(47) (48) Female thread hole
(49) (50) Moving piece
(51) axis
(52) Linkage
(52a) Base piece
(52b) Side projection
(53) axis
(54) (55) Link
(56) Control lever
(57) Window hole
(58) Box
(59) axis
(60) Buttocks
(61) (62) Elastic engagement claw
(63) Tube mounting piece
(64) Wire unit (linkage means)
(65) Wire
(66) Tube
(67) Circular hole
(68) Control case
(69) Tube mounting piece
(70) axis
(71) Actuating lever
(71a) Upward arm
(71b) Lateral arm

Claims (7)

In a chair that supports a seat by a support base supported by legs, and has a front end portion of a lower part of a pair of left and right back support supports that support the backrest on both sides of the support base, the back support A protrusion that faces in the direction perpendicular to the longitudinal direction is provided on one of the lower side surfaces of the bag, and an operation lever linked to the operation part of the gas spring that restricts the movement of the movable part provided on the chair is provided on this protrusion. A gas spring operating device for a chair, characterized by being provided. Collision portion provided with a window hole penetrating in the lateral direction, into the window hole, the gas spring control device according claim 1, wherein the chair is pivotally mounted with the axis facing the operating lever front-back direction.   The gas spring operating device for a chair according to claim 2, wherein a box is fitted into the window hole, and an operating lever is pivotally attached to the box.   One end of the linking means for linking the operation portion of the gas spring and the operation lever is connected to an operating lever that can push the push valve in the operation portion of the gas spring, and the other end is connected to the back from the back support rod. A wire connected to the operation lever across the bend support rod, the wire is inserted so as to be slidable in the axial direction, and one end is on the outer surface of the operation portion of the gas spring and the other end is the back support rod or the same The gas spring operating device in the chair according to any one of claims 1 to 3, wherein the wire unit is composed of a flexible tube fastened to an integral member.   When the gas spring is installed in the telescopic leg and the push valve is in the non-operating position, the leg cannot be expanded and contracted, and the push valve is pushed to the operating position to expand and contract the leg. The gas spring operating device for a chair according to any one of claims 1 to 4, wherein the device is for adjusting the height of a seat that enables the seat.   One end of the gas spring is connected to the support base, and the other end is connected to the tip of the arm that rotates integrally with the backrest support rod, and the push valve provided at one end is moved to the operating position. The chair according to any one of claims 1 to 5, wherein the chair can be used for adjusting a tilt angle of a backrest that can be expanded and contracted and that cannot be expanded and contracted by returning the push valve to an inoperative position. Gas spring operating device.   Either one of the pair of left and right backrest support rods is provided with an operation lever for operating the gas spring for adjusting the seat height, and the other backrest support rod is provided with a gas spring for adjusting the tilt angle of the backrest. The gas spring operation device in the chair according to any one of claims 1 to 6, further comprising an operation lever for operating the chair.

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