JP4993225B2 - Torque release mechanism of operation handle - Google Patents

Description

  The present invention rotates an actuator that operates the floor of an elevating / undulating bed used in hospitals, nursing homes, homes, etc., and rotates an actuator that operates a table and various members in other devices A torque release mechanism in an operating handle that can release the torque when an excessive torque is generated in the operating handle at the limit of the operating range of the floor, etc. It is about.

  In medical and nursing settings, the operation handle is often rotated to urgently move the bed floor up and down, and in this case, when the floor reaches the upper or lower limit of the operating range. In many cases, the rotating operation of the operating handle is continued. For this reason, an excessive torque is generated on the output shaft, and the operating handle itself and other members, which are important parts, may be damaged.

  Thus, various torque release mechanisms have been proposed in the past for releasing the torque and preventing damage when excessive torque is generated in the operation of the operation handle.

  For example, in Patent Document 1, the transmission of torque from the handle body to the output shaft is a spring between a bent portion and a claw portion formed on a leaf spring member as an urging means, and a gear portion and a notch portion formed on a clutch member. It can be configured by engagement, or it can be configured by spring engagement between the notch formed in the member urged by the compression coil spring and the inclined protrusion formed in the clutch member. When torque is generated, the torque is released by releasing the spring engagement.

  Further, in Patent Document 2, the handle body is attached to the output shaft by a configuration in which a viscous fluid or a viscous elastic body is sealed in a gap formed between the bush on the handle body side on which the output shaft is fitted and the bush fitting hole. The torque is released by idling.

JP 2003-13993 A JP 2005-46308 A

In the conventional torque release mechanism exemplified above, the torque setting for performing the releasing operation cannot be adjusted with the one of Patent Document 2.
On the other hand, in the thing of patent document 1, although the setting of the torque which performs opening operation | movement can be adjusted with the spring constant of a spring plate or a compression coil spring, in order to adjust, it is necessary to replace a spring plate or a compression coil spring. It is cumbersome and cannot be fine tuned.

Moreover, in the thing of patent document 2, since it releases torque by idling by viscous fluid, it is hard to feel the operation | movement by which torque was released clearly, and it is difficult for an operator to recognize the limit of operation, Since the structure is special, there are problems such as high cost and limited production place / equipment.
An object of the present invention is to solve the above problems.

  In order to solve the above-described problems, in the present invention, first, a mounting recess provided on the output shaft side of the handle body, an annular lid that is screwed to the opening side of the mounting recess, and an axial movement within the mounting recess. A mechanism member that can be mounted, and the mechanism member has a pair of engagement members that are disengaged by torque and can be rotated relative to each other, and the clutch member and the annular lid. An output shaft support member mounted between the output shaft support member, an output shaft supported by the output shaft support member and protruding through the central opening of the annular lid, and a compression mounted between the clutch member and the bottom of the mounting recess. A torque release mechanism for an operating handle composed of an urging member is proposed.

  In the present invention, next, a mounting recess provided on the output shaft side of the handle body, an annular lid screwed to the opening side of the mounting recess, and a mechanism member mounted in the mounting recess so as to be movable in the axial direction The mechanism member includes a clutch member having a pair of engagement members that are disengaged by torque and can be rotated relative to each other, and an output that is mounted between the clutch member and the annular lid. A shaft support member, an output shaft supported by the output shaft support member and projecting through the central opening of the annular lid, and a compression urging member mounted between the clutch member and the output shaft support member. We propose a torque release mechanism for the operating handle.

  According to the present invention, in the above configuration, the clutch member has a washer member disposed on the front and back sides of the ball guide that holds a plurality of balls, and the one side washer member corresponds to the ball holding hole of the ball guide. A torque release mechanism for an operation handle, which is a thrust ball bearing having a recess for engaging a ball, is proposed.

  The present invention also proposes a torque release mechanism for an operating handle, in which the clutch member is a member constituting a gear clutch mechanism or a friction clutch mechanism.

  According to the present invention, in the above configuration, the thrust ball bearing includes a torque release mechanism for an operation handle in which a washer member provided with a concave portion for ball engagement is arranged on the output shaft support member side, and the thrust ball bearing is for ball engagement. A torque release mechanism for an operation handle is proposed in which a washer member having a recess is arranged on the bottom side of the mounting recess.

  The present invention proposes a torque release mechanism for the operating handle, in which the compression urging member is a disc spring, and is a compression coil spring or an elastic body itself.

  In the above configuration, in a normal use state of the operation handle, the clutch member is pressed against the bottom of the output shaft support member or the mounting recess by the urging force of the compression urging member, and the pair of engaging members are engaged. In this state, the torque applied from the mounting recess in the operation of the handle body is transmitted to the output shaft support member and the output shaft through the pair of engagement members of the clutch member, and is connected to the output shaft. It is possible to rotationally drive the actuator of the lifting / tilting mechanism of the part.

  If the operation handle is rotated in this way to move the floor up and down and tilt, and if the operation handle continues to rotate without knowing that it has reached the limit position of the operation, the actuator and the like cannot be rotated. Since the rotation of the output shaft is prevented, an excessive torque is generated between the output shaft and the handle body.

  However, in the present invention, when the torque reaches a certain value or more, the engagement of the pair of engagement members is released and relative rotation becomes possible, and thus the generation of excessive torque is prevented by the idling of the clutch member. The

  When the rotation operation of the operation handle in such a state continues, when the above-described thrust ball bearing or gear clutch mechanism is used as the clutch member, a so-called click feeling and click sound are given to the operator of the operation handle. Thus, the operator can easily recognize that this has reached the limit position of operation.

  The torque required to release the engagement of the pair of engagement members corresponds to the urging force of the compression urging member. Therefore, by adjusting the urging force, the torque for performing the above-described opening operation is performed. Can be adjusted. In the present invention, the biasing force can be easily adjusted and finely adjusted by adjusting the degree of screwing of the annular lid that is screwed into the opening side of the mounting recess.

  If a disc spring is used as the compression urging member, a predetermined urging force can be obtained in a space-saving manner, but a compression coil spring or an elastic body such as urethane or rubber can also be used.

FIG. 1 is a diffusion exploded view showing components of a first embodiment of a torque release mechanism for an operating handle according to the present invention. FIG. 2 is a diffusion exploded view of the constituent elements of the first embodiment of the torque release mechanism of the operating handle according to the present invention as viewed from a direction different from FIG. FIG. 3 is a diffusion exploded view in which each element shown in FIG. FIG. 4 is a cross-sectional view of the operating handle shown in FIGS. FIG. 5 is a cross-sectional view of the operating handle shown in FIGS. 1 to 3 in a use state where torque is released. FIG. 6 is a diffusion exploded view showing components of the second embodiment of the torque release mechanism of the operating handle according to the present invention. FIG. 7 is a diffusion exploded view showing components of the third embodiment of the torque release mechanism of the operating handle according to the present invention. FIG. 8 is a diffusion exploded view of the components of the third embodiment of the torque release mechanism of the operating handle according to the present invention as viewed from a direction different from FIG.

Next, an embodiment of a torque release mechanism for an operation handle according to the present invention will be described with reference to the accompanying drawings.
First, FIGS. 1 to 5 relate to a first embodiment of the present invention. In these drawings, reference numeral 1 denotes a handle body, and a mounting recess 2 is provided on one end side of the handle body 1, that is, on the output shaft side. An annular lid 3 is screwed into the opening side of the mounting recess 2 and a mechanism member is mounted in the mounting recess 2 so as to be movable in the axial direction. Reference numeral 4 a is an internal thread formed on the inner surface of the mounting recess 2 on the opening side, and reference numeral 4 b is an external thread formed on the outer periphery of the annular lid 3.

  In this embodiment, the mechanism member uses a thrust ball bearing as the clutch member 12. That is, this mechanism member has a plurality of disc springs, in this case, four compression urging members 5 arranged in a stacked manner, and washer members 8 and 9 arranged on the front and back sides of a ball guide 7 holding a plurality of balls 6. In addition, a thrust ball bearing 12 in which a ball engaging recess 11 is formed in the washer member 8 on one side corresponding to the ball holding hole 10 of the ball guide 7, and between the thrust ball bearing 12 and the annular lid 3. An output shaft support member 13 to be mounted and an output shaft 14 supported by the output shaft support member 13 and projecting through a central opening (reference numeral omitted) of the annular lid 3 are configured.

  Here, the disc spring as the compression urging member 5, the washer members 8, 9 and the ball guide 7 all have a central opening (reference numeral omitted), which opens from the bottom side of the mounting recess 2. It is set as the structure fitted to the guide cylindrical part 15 protrudingly provided in the side.

  As shown in the figure, in this embodiment, the mechanism member is composed of a compression biasing member 5, a washer member 9, a ball guide 7 and a ball 6, which are disc springs, from the bottom side to the opening side of the mounting recess 2. The washer member 8, the output shaft support member 13, and the output shaft 14 formed with the ball engaging recess 11 are sequentially mounted, and the annular lid 3 is screwed into the opening side of the mounting recess 2 to be in use.

  In this case, a plurality of axial recesses 16 are provided on the inner surface of the mounting recess 2, and a projection 17 is provided on the outer periphery of the ball guide 7 corresponding to the recesses 16. By doing so, the ball guide 7 is supported with respect to the mounting recess 2 so as to be movable only in the axial direction.

  On the other hand, the output shaft support member 13 is provided with a recess 18 into which the washer member 8 is fitted, and a plurality of protrusions 19 are provided in the recess 18, and on the outer periphery of the washer member 8, Corresponding recesses 20 are provided. For this reason, the washer member 8 rotates integrally with the output shaft support member 13. Therefore, the washer member 8 and the output shaft support member 13 can be configured as an integral member.

  Further, in this embodiment, an O-ring 21 is interposed between the output shaft support member 13 and the annular lid 3 for the purpose of dust prevention and waterproofing. A handle 22 for operation is provided on the other end side of the handle body 1 so as to be foldable.

  In the above configuration, in the normal use state of the operation handle, the thrust ball bearing 12 is pressed against the output shaft support member 13 by the biasing force of the compression biasing member 5 as shown in FIG. The ball 6 held in the ball holding hole 10 is engaged with an engaging recess 11 formed in the washer member 8. Since the ball 6 is kept in engagement with the engaging recess 11 by the biasing force of the compression biasing member 5, the torque applied from the mounting recess 2 to the ball guide 7 during the operation of the handle body 1 is the engagement recess. 11, a washer member 8 via a ball 6 engaged with 11, an output shaft support member 13 that supports the washer non-rotatably, and a bed that is transmitted to the output shaft 14 and connected to the output shaft 14. It is possible to rotationally drive the actuator of the raising / lowering / tilting mechanism of the floor.

  If the operation handle is rotated in this way to move the floor up and down and tilt, and if the operation handle continues to rotate without knowing that it has reached the limit position of the operation, the actuator and the like cannot be rotated. Since the output shaft 14 is prevented from rotating, an excessive torque is generated between the output shaft 14 and the handle body 1.

  However, in the present invention, when the torque reaches a certain value or more, the ball 6 comes out of the engaging recess 11 of the washer member 8 against the urging force of the compression urging member 5 as a relative motion. The washer member 8 rotates relative to the thrust ball bearing 12 in the same manner as in the normal operation of the thrust ball bearing 12 and thus idles to prevent generation of excessive torque.

  When the rotation of the operation handle is continued in such a state, the ball 6 idles in the washer member 8 through the engaging recess 11 and the portion where it is not provided in sequence, that is, the ball 6 moves to the engaging recess 11. Since the engagement and the release thereof are continuously performed, a so-called click feeling and click sound are given to the operator of the operation handle. Therefore, the operator can easily recognize that the operation has reached the limit position, and the operation feeling is very good.

  Here, the torque required for the ball 6 to come out of the engaging recess 11 corresponds to the urging force of the compression urging member 5, and therefore, by adjusting this urging force, the torque at which the above-described opening operation is performed. Can be adjusted.

  In particular, in the present invention, the biasing force can be easily adjusted and finely adjusted by adjusting the degree of screwing of the annular lid 3 screwed into the opening side of the mounting recess 2.

  As shown in this embodiment, if a disc spring is used as the compression urging member 5, a predetermined urging force can be obtained in a small space. In addition, the compression urging member 5 may be a compression coil spring or an elastic body such as urethane or rubber.

  In the above embodiment, the thrust ball bearing 12 as the clutch member has the washer member 8 provided with the ball engaging recess 11 on the output shaft support member 13 side, but in the second embodiment, Conversely, as shown in FIG. 6, the thrust ball bearing 12 may have the washer member 8 provided with the ball engaging recess 11 on the bottom side of the mounting recess 2.

In this embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted, and only the differences will be described.
That is, in this embodiment, the protrusions 23 are formed on the outer periphery of the washer member 8 provided with the ball engaging recesses 11 corresponding to the plurality of axial recesses 16 formed on the inner surface of the mounting recess 2. The washer member 8 is supported so as to be movable only in the axial direction with respect to the mounting recess 2 by being fitted into the recess 16.

  On the other hand, the output shaft support member 13 is provided with a recess (not shown) for fitting the washer member 9 and the ball guide 7 and a protrusion similar to the plurality of protrusions 19 described above is provided in the recess. Then, on the outer circumferences of the washer member 9 and the ball guide 7, concave portions 24 and 25 corresponding to the protrusions are provided, respectively. For this reason, the washer member 9 and the ball guide 7 rotate integrally with the output shaft support member 13. Also in this embodiment, the washer member 9 and the output shaft support member 13 can be configured as an integral member.

  Further, in the above embodiment, the compression biasing member 5 is provided between the thrust ball bearing 12 and the bottom of the mounting recess 2, but as another embodiment, illustration is omitted, A compression biasing member may be provided between the thrust ball bearing 12 and the output shaft support member 13.

  Next, FIGS. 7 and 8 relate to the third embodiment of the present invention. In this third embodiment, the clutch member 12 is used as the thrust ball bearing in the first and second embodiments described above. Instead of this, the engagement member 27 on one side of the pair of engagement members 26 and 27 constituting the member of the gear clutch mechanism is integrated with the output shaft support member 13. It is composed. Since the other constituent elements are the same as those in the first and second embodiments described above, the corresponding constituent elements will be denoted by the same reference numerals, and redundant description will be omitted, and only the differences will be described. .

  That is, in this embodiment, the clutch member 12 having a pair of engagement members 26 and 27 that are disengaged by torque and can be rotated relative to each other constitutes a gear clutch mechanism. Trapezoidal teeth 28 and 29 that mesh with each other are formed on the opposite surface side. The engagement member 27 on the side of the annular lid 3 is formed integrally with the output shaft support member 13, and is further fitted to the recess 16 in the mounting recess 2 on the outer periphery of the engaging member 26 on the mounting recess 2 side. It is the structure which provided the protrusion 30 to match.

  Also in this embodiment, the operation handle is rotated to move the floor up and down, and the operation handle is rotated without knowing that the operation limit position has been reached. When the torque between the pair of engagement members 26 and 27 reaches a certain value or more, the engagement by the teeth 28 and 29 of the pair of engagement members 26 and 27 is released, and relative rotation is possible. Thus, the clutch member 12 is idled. Generation of excessive torque is prevented. If the rotation operation of the operation handle in such a state is continued, a so-called click feeling and click sound may be given to the operator of the operation handle every time the teeth 28 and 29 are repeatedly engaged and released. Therefore, the operator can easily recognize that the operation has reached the limit position.

  The torque release mechanism of the operating handle of the present invention has the above effects and is simple in structure, so that the production place and equipment are not limited and can be produced at low cost.

  Thus, in the present invention, in addition to the use as a crank-like operation handle for rotating the actuator that operates the floor of an elevating and undulating bed used in hospitals, nursing homes, homes, etc., in other various devices, The possibility of use as a crank-like operation handle for rotating an actuator that operates a table or various members is great.

DESCRIPTION OF SYMBOLS 1 Handle body 2 Mounting recessed part 3 Annular lid 4a Female thread part 4b Male thread part 5 Compression biasing member (Belleville spring)
6 Ball 7 Ball guide 8 Washer member (with recess)
9 Washer member 10 Ball holding hole 11 Engaging recess 12 Clutch member (thrust ball bearing, component of gear clutch mechanism)
13 Output shaft support member 14 Output shaft 15 Guide cylindrical portion 16 Recesses 17, 19, 23, 30 Protrusions 18, 20, 24, 25 Recesses 21 O-ring 22 Handles 26, 27 Engaging members 28, 29 Teeth

Claims (10)

A mounting recess provided on the output shaft side of the handle body, an annular lid screwed into the opening side of the mounting recess, and a mechanism member mounted in the mounting recess so as to be movable in the axial direction. A clutch member having a pair of engaging members that are disengaged by torque and capable of relative rotation, an output shaft support member that is mounted between the clutch member and the annular lid, and the output shaft An operation handle comprising an output shaft supported by a support member and projecting through a central opening of an annular lid, and a compression urging member mounted between the clutch member and the bottom of the mounting recess. Torque release mechanism. A mounting recess provided on the output shaft side of the handle body, an annular lid screwed into the opening side of the mounting recess, and a mechanism member mounted in the mounting recess so as to be movable in the axial direction. A clutch member having a pair of engaging members that are disengaged by torque and capable of relative rotation, an output shaft support member that is mounted between the clutch member and the annular lid, and the output shaft An operation handle comprising: an output shaft supported by a support member and projecting through a central opening of the annular lid; and a compression urging member mounted between the clutch member and the output shaft support member Torque release mechanism. The clutch member is a thrust ball bearing in which a washer member is disposed on the front and back sides of a ball guide that holds a plurality of balls, and a concave portion for ball engagement is formed in the washer member on one side corresponding to the ball holding hole of the ball guide. The torque release mechanism of the operation handle according to claim 1, wherein the torque release mechanism is an operation handle. 3. The operating handle torque release mechanism according to claim 1, wherein the clutch member is a member constituting a gear clutch mechanism. The torque release mechanism for an operation handle according to claim 1, wherein the clutch member is a member constituting a friction clutch mechanism. 4. The operating handle torque release mechanism according to claim 3, wherein the thrust ball bearing has a washer member provided with a concave portion for ball engagement arranged on the output shaft support member side. 4. The operating handle torque release mechanism according to claim 3, wherein the thrust ball bearing has a washer member provided with a concave portion for ball engagement arranged on the bottom side of the mounting concave portion. The torque release mechanism for an operation handle according to claim 1, wherein the compression urging member is a disc spring. The torque release mechanism for an operation handle according to claim 1, wherein the compression urging member is a compression coil spring. The torque release mechanism for an operation handle according to any one of claims 1 to 7, wherein the compression urging member is an elastic body itself.

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