JP5837803B2 - Armrest device - Google Patents

Description

  The present invention relates to an armrest device that can hold an elbow rest member in a posture rotated sideways (left and right).

  Various armrest devices that can hold the armrest member in a laterally rotated posture have been developed. However, in Patent Document 1, an armrest support rod is fitted to the armrest strut so as to be movable up and down and fixed to the upper end of the armrest support rod. A support cylinder provided with a plurality of stop grooves facing in the vertical direction spaced apart in the circumferential direction on the outer peripheral surface is erected on the upper surface of the elbow rest support plate, and a pad member can be fixed to the upper part of the support cylinder The cylindrical portion facing the up-down direction provided on the elbow pad that faces in the front-rear direction is fitted so as to be horizontally rotatable, and the U-shaped frame-shaped holding piece continuously provided on the outer peripheral surface of the cylindrical portion; An elastic body made of rubber is fitted into a bottomed recess surrounded by the outer peripheral surface of the cylindrical portion, and a notch is formed in a portion facing the concave portion in the cylindrical portion. Part of the cylindrical portion protrudes from the inner surface of the cylindrical portion, so that it is selective to the stop groove. An engaging pin that can be engaged in a vertical direction is provided, and the outer peripheral surface of the front end portion of the engaging pin is brought into contact with the rear surface of the elastic body so that the engaging pin is urged toward the support cylinder, and the cylindrical portion It is disclosed that stopper means for restricting the maximum amount of rotation of the elbow rest substrate in the left-right direction is provided on the inner surface of the support cylinder and the outer peripheral surface of the support cylinder.

Japanese Patent No. 4373184 (refer to FIGS. 1, 3, 6, and 7)

  By the way, even if an inadvertent external force in the left-right direction acts on the elbow rest member, the elbow rest member does not rotate without darkness. A value obtained by multiplying the distance to the position (the arm length of the moment) by the engagement resistance force between the locking pin and the stop groove, that is, a so-called moment needs to be as large as possible.

  In order to horizontally rotate the elbow rest substrate in the left-right direction with respect to the elbow rest support plate, in the configuration of Patent Document 1, the cylindrical portion of the elbow rest substrate is externally fitted to the cylindrical support tube of the support plate. Yes. However, in general, the pivotable elbow rest board is long in the front-rear direction of the chair, but the width dimension in the direction orthogonal thereto is short, so the diameter of the cylindrical portion of the elbow rest board is limited to be smaller than the width dimension. . In the configuration of Patent Document 1, the locking pin and the storage recess of the elastic body that urges the locking pin in the stop groove direction are arranged on the outer peripheral surface side of the cylindrical portion of the elbow rest substrate and on the longitudinal direction side of the elbow rest substrate. However, the distance from the engagement position between the locking pin and the stop groove to the rotation center of the elbow rest substrate is substantially limited to the radius of the inner peripheral surface of the cylindrical portion (the outer peripheral surface of the support tube).

  That is, since the diameter (radius) of the cylindrical portion is limited by the width dimension of the elbow pad as described above, the arm length of the moment cannot be arbitrarily increased. Therefore, in the configuration of Patent Document 1, since the locking pin and the stop groove are long in the vertical direction, the engagement resistance force between the locking pin and the stop groove is relatively large compared to the engagement by the ball, but the moment cannot be increased. As a result, there has been a problem that the elbow rest member is easily rotated by an external force in the horizontal direction (left-right direction).

  The present invention has been made to solve the above-described problems, and can easily adjust the holding position of the elbow rest member in the left-right rotation direction and can increase the position holding force of the elbow rest member as much as possible. Accordingly, it is an object of the present invention to provide an armrest device in which the elbow rest member is not easily rotated by an external force in the horizontal direction (left-right direction).

  In order to achieve the above object, the invention according to claim 1 is an armrest device in which the orientation of the elbow rest member is mounted so that the orientation of the elbow rest member can be changed and adjusted in a substantially horizontal direction with respect to the elbow strut. The elbow rest base and an elbow rest pad body covering the upper side of the elbow rest base are provided, and the support base at the upper end of the elbow strut is in sliding contact with the lower surface and the inner peripheral surface of the cylindrical portion serving as the rotation center of the elbow rest base. A buffer is externally fitted, and the elbow rest base is formed with an arc portion concentric with the center of rotation of the tube portion at a radial position larger than the radius of the tube portion, and on the inner peripheral surface of the arc portion A plurality of engaging recesses are formed at appropriate intervals in the circumferential direction, and the buffer body or the support base has a recess having an opening in a direction facing one side of the inner peripheral surface of the arc portion. Is provided between the elastic body disposed in the recess and the inner peripheral surface of the arc portion. When the engagement pin is inserted and the engagement pin is urged by the elastic body in the direction of the inner peripheral surface of the arc portion, the engagement recess is rotated when the elbow rest member is rotated around the tube portion. And the engagement pin are selectively engaged.

  According to a second aspect of the present invention, in the armrest device according to the first aspect, the engagement pin is disposed so as to be displaceable in a radial direction of the arc portion.

  According to a third aspect of the present invention, in the armrest device according to the first or second aspect, the cylindrical portion has a notched portion in which a part of a circumference thereof is notched, and the arc portion is the notched portion. Stopper means for restricting the maximum amount of rotation of the elbow pad base is provided on both the left and right sides of the portion where the circular arc portion communicates with the notch portion and the support base portion. .

  According to a fourth aspect of the present invention, in the armrest device according to any one of the first to third aspects, the elbow strut includes an elevating body for elevating and lowering the elbow rest member, and the support base is provided at an upper end of the elevating body. It is provided.

  According to the first aspect of the present invention, the support base at the upper end of the elbow strut is externally fitted with a buffer that is slidably in contact with the lower surface and the inner peripheral surface of the cylindrical portion serving as the center of rotation of the elbow rest base, The elbow rest base is formed with a circular arc portion concentric with the rotation center of the cylindrical portion at a radial position larger than the radius of the cylindrical portion, and the inner circumferential surface of the circular arc portion is appropriately spaced in the circumferential direction. A plurality of engaging recesses are formed in the buffer body or the support base, and a recess having an open portion is provided in a direction facing one side of the inner peripheral surface of the arc portion. An engagement pin is inserted between the elastic body disposed in the place and the inner peripheral surface of the arc portion, and the engagement pin is urged by the elastic body toward the inner peripheral surface of the arc portion, When the elbow rest member is rotated left and right around the tube portion, one of the engagement recesses and the engagement pin are selectively Since it engages, the distance (arm length of moment) from the rotation center line of the elbow rest member to the engagement position between the lock pin and the engagement recess can be set large, and the lock pin and the engagement recess Since the engagement resistance force can be increased, the rotational moment of the elbow rest member at this locking position is increased, and the position holding force of the elbow rest member can be increased as much as possible. In other words, by arranging the arc portion, the engagement recess, the locking pin and the elastic body at the position in the front-rear direction (longitudinal direction) of the elbow rest member, even if the width dimension of the elbow rest member is small, The rotational moment of the elbow rest member can be increased. Therefore, there is an effect that the elbow rest member is not easily rotated by an external force in the horizontal direction (left-right direction).

  According to the second aspect of the present invention, since the engagement pin is disposed so as to be displaceable in the radial direction of the arc portion, the user can change the direction of the elbow rest member from side to side. When the external force is applied, the engagement pin can be disengaged from the engagement recess.

  According to a third aspect of the present invention, the cylindrical part has a notch part in which a part of the circumference is notched, the arc part is formed so as to communicate with the notch part, and the arc Since the left and right sides of the portion where the portion communicates with the notch and the support base are provided with stopper means for restricting the maximum amount of rotation of the elbow rest base, the stopper area can be made relatively large. it can.

  According to the fourth aspect of the present invention, the elbow rest member can be moved up and down, and the left and right directions can be changed.

It is a side view of an armrest device. It is a front view of an armrest device. It is a top view of the armrest apparatus except the upper member of the armrest member. It is a component exploded view of an armrest device. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a disassembled perspective view of a stopper arm, a raising / lowering body, and an operation member. It is a top view which shows the horizontal direction change state of an elbow rest member. It is a component exploded view of the horizontal direction change adjustment means of an elbow rest member. (A) is a component assembly drawing of the horizontal direction change adjusting means of the elbow rest member, and (B) is a plan view of the main part. It is a perspective view of an elbow pad base material. (A) is a perspective view of a suspension support body, (B) is a top view similarly. FIG. 5 is a perspective view of a stopper arm and an operation member that are mounted on the robot. (A) is a perspective view from the front of a suspension support body, (B) is a perspective view from the front of the state with which the component of the horizontal direction change adjustment means was mounted to the upper part of the suspension support body. It is the perspective view seen from the inner surface of the operation member.

[Configuration of lifting device for lifting body]
Next, the structure of the armrest apparatus of this invention is demonstrated, referring drawings. As shown in FIGS. 1 to 4, the armrest device 1 can move up and down with respect to the elbow strut 2 having base ends attached to the left and right sides of a chair seat or seat receiver (not shown). And an elevating body 3 to be mounted on. As will be described later, the elbow rest member 4 is rotated laterally (in a direction crossing (orthogonal to) the lifting / lowering direction of the lifting / lowering body 3) at the upper end of the lifting / lowering body 3 so that the orientation can be adjusted and held. Installed. The elbow rest member 4 includes an elbow rest base body 4a and an elbow rest pad body 4b fitted so as to cover the upper surface thereof. Hereinafter, right and left means the left and right direction when viewed from a person sitting on the chair body, front and rear (front and rear direction) means a direction perpendicular to the left and right direction, and front (front direction) means a person sitting on the seat body. Say the front side.

  The base end 2a of the elbow strut 2 extends in the lateral direction. The column portion 2b extending substantially linearly upward from the base end portion 2a is formed in a cylindrical shape on which a substantially cylindrical lifting body 3 is mounted so as to be movable up and down.

  A fitting hole 5 penetrating vertically is formed in the inner diameter of the support column 2 b, and a spacer member 6 is inserted and fixed in the fitting hole 5, and the elevating body 3 moves up and down in the inner diameter part of the spacer member 6. Insert freely. In the embodiment, the spacer member 6 includes a pair of half-cylindrical halves 6a and 6a divided into two along the central axis of the fitting hole 5, and the halves 6a and 6a have the same shape. As a result, the cost of the spacer member 6 can be reduced by using only one type, and the assembly work can be simplified and the spacer member 6 can be prevented from being erroneously attached to the armrest devices arranged on the left and right sides of the chair. ing.

  As shown in FIGS. 4 and 6, a semi-annular flange 7 is formed at the upper end of the half 6 a so as not to fall downward from the upper end of the support column 2 b. Protrusions 8a are formed on one of the half end faces of both flanges 7, and an engagement recess 8b is formed on the other half end face (only one half 6a is shown in FIG. 6). Thus, when the pair of halves 6a, 6a are combined, the projection 8a in one half 6a and the engagement recess 8b in the other half 6a are fitted and do not shift in position. .

  As shown in FIGS. 4 and 6, the lower half of the outer peripheral surface of each half 6a is elastically engaged with a stepped portion 9 provided at the lower end of the inner diameter (fitting hole 5) of the support column 2b. A plurality of elastic engagement claws 10 are provided. Furthermore, the engagement recesses 11 are formed in each half 6a along the longitudinal direction (vertical direction) at appropriate predetermined intervals. In the embodiment, each engagement recess 11 passes through a half-cylindrical wall plate of each half-divided body 6a. Further, a plurality of elastic protruding tongues 12 are provided on the inner diameter side of the half-cylindrical wall plate of each half-divided body 6a in the vertical direction of the half-divided body 6a, so that it is fitted to the inner diameter portion of the spacer member 6 and moves up and down. This prevents rattling of the elevating body 3 when doing so.

  In addition, as shown in FIG. 7, the longitudinally long guide groove 34a is provided only in the upper half part of a cylindrical part in the outer peripheral side surface of the cylindrical part of the raising / lowering body 3. As shown in FIG. On the other hand, a stopper projection 34b that fits into the longitudinal guide groove 34a is formed at the upper end of the inner surface of the half body 6a corresponding to the longitudinal guide groove 34a (see FIG. 4). This prevents the vertically long guide groove 34a from colliding with the stopper projection 34b at the upper limit position of the lifting body 3 to prevent the lifting body 3 from further rising, and hence the lifting body 3 from coming out of the column portion 2b. it can. As for the mounting order, after the spacer member 6 is externally fitted to the elevating body 3, these are integrally inserted from the upper end of the fitting hole 5 of the support column 2b.

  The stopper arm 13 disposed on the inner diameter portion of the elevating body 3 has a main body 13 a that is a vertically long rod-like body, a supported portion 14 is formed at the upper end portion thereof, and an engaging claw portion 15 at the lower portion of the stopper arm 13. Is formed. The engaging claw portion 15 selectively engages with one of the plurality of engaging recesses 11 formed at appropriate intervals along the ascending / descending direction of the elevating body 3 in the spacer member 6. The engagement claw portion 15 and the engagement recess 11 correspond to the engagement portion described in the claims. A bulging portion 16 serving as a rotation center is formed in the middle of the upper and lower portions of the main body 13a of the stopper arm 13.

  A lifting support body provided below the elbow rest member 4 is provided with a suspension support section 18 for supporting the supported portion 14 so as to be slidable only in the lateral direction crossing the lifting direction of the lifting body 3. 17 is fixed (see FIGS. 4 to 7, 12, and 13). The lifting body 3 is formed with a rotation support portion 20 for rotating the stopper arm 13 around the bulging portion 16. Further, an operation member 21 for operating the supported portion 14 of the stopper arm 13 is provided adjacent to the suspension support body 17.

  Below, the detailed structure of each member is demonstrated. In the embodiment, the bulging portion 16 is formed integrally with the main body 13a of the stopper arm 13 so as to form a part of a disk. Similarly, the supported portion 14 and the engaging claw portion 15 are integrally formed with the main body 13 a of the stopper arm 13. Further, a bar-like spring body 19 as a biasing means extending downward is formed integrally with the main body 13a on the side surface opposite to the protruding side of the engaging claw portion 15 in the middle part of the stopper arm 13 in the vertical direction. Yes. In the embodiment, the suspension support portion 18 in the suspension support body 17 has concave grooves 22 that are recessed in the left and right sides that intersect with the sliding direction of the supported portion 14. The groove is open to the lower end side of the body 17 and is substantially a T-shaped groove. FIG. 7 shows a state in which the supported portion 14 is fitted to the suspension support portion 18, but does not show the mounting order.

  The supported portion 14 is integrally formed with protruding ridges 23 projecting sideways on the left and right sides intersecting the sliding direction with respect to the suspension support portion 18, and can be slid in a state in which the ridge 23 is fitted in the concave groove 22. It is. In the illustrated embodiment, the rotation support portion 20 for rotating the stopper arm 13 is formed to slidably support only the arc portion on the side close to the suspension support portion 18 on the outer peripheral surface of the bulging portion 16. (See FIG. 5). Therefore, when the stopper arm 13 is inserted from the lower end direction of the fitting hole 5 of the elevating body 3 with the supported portion 14 at the upper end facing upward, the upper half of the outer peripheral surface of the bulging portion 16 contacts the rotation support portion 20. Can't go any further upwards. In this state, the spring body 19 in the stopper arm 13 elastically presses the inner diameter portion of the elevating body 3, and the distal end portion of the engaging claw portion 15 projects outward from a through hole 24 formed in a predetermined position of the elevating body 3. As described above, the distal end portion of the engagement claw portion 15 can be engaged with any one engagement recess 11 in the spacer member 6.

  A mounting hole 26 into which at least the suspension support body 17 can be inserted laterally from the front side (a direction perpendicular to the lifting direction of the lifting body 3) is formed at the upper end of the lifting body 3 (see FIG. 7). In the embodiment, it can be inserted into the mounting hole 26 in a state where a rotation support body 35 described later is mounted on the upper part of the suspension support body 17. In this case, as will be described later, a state in which the inclined claws 29a at the tips of the pair of sliding contact pieces 29 protruding from the inner surface of the cover portion 27 of the operation member 21 are confined to the back side from the stopper portion 32 in the rotation support 35. Then, the rotation support body 35 and the suspension support body 17 are integrally inserted into the mounting hole 26. Accordingly, when the suspended support body 17 is inserted together with the rotation support body 35 with the supported section 14 facing the mounting hole 26, the supported section 14 is fitted from the rear end side of the suspended support section 18, and the stopper arm 13. Is suspended so that it cannot fall (see FIG. 7). Accordingly, when the suspension support body 17 is inserted together with the rotation holding means 30 with the supported portion 14 facing the mounting hole 26, the supported portion 14 is fitted from the rear end side of the suspension support portion 18, and the stopper arm 13. Is suspended so that it cannot fall (see FIGS. 4, 5 and 6).

  As shown in FIGS. 1 and 5, the operation member 21 for operating the supported portion 14 of the stopper arm 13 is an upper end portion of the elevating body 3 and has an arc shape that closes the mounting hole 26 from the front. A cover part 27 is provided, and a pressing part 28 for pressing the supported part 14 from the front side protrudes backward on the inner surface of the cover part 27. Further, on both the left and right sides of the pressing portion 28, sliding contact pieces 29 made of a pair of elastic bodies that slide in contact with the guide grooves 31 in the front-rear direction formed on the left and right side surfaces of the suspension support body 17 extend backward. An inclined claw 29 a for preventing the operation member 21 from coming forward is provided at the front ends of the sliding contact pieces 29, and the operation member 21 is supported by the biasing force of the spring body 19 via the supported portion 14 of the stopper arm 13. When the head moves forward, the inclined claw 29a comes into contact with the stopper portion 32 at the rear end of the guide groove 31 so that it cannot be pulled forward any further.

  Note that the front surface of the rotation support 35, the locking pin 38, and the elastic body 37 are formed by the inner cover portion 33 that extends upward from the front surface of the suspension support body 17 and has substantially the same curved surface as the inner surface of the cover portion 27 of the operation member 21. Since the front side is covered, even if there is a gap between the inner surface of the cover part 27 of the operation member 21 and the inner cover part 33, only the front surface of the suspension support body 17 can be seen, and the internal structure of the rotation holding means 30 can be visually confirmed. Therefore, the aesthetic appearance is excellent.

[How to lift and lower the lifting body]
With the above configuration, when the cover portion 27 of the operation member 21 is pushed, the pressing portion 28 pushes the supported portion 14 backward in the suspension support portion 18 of the suspension support body 17. The stopper arm 13 rotates about the bulging portion 16 against the urging force of the spring body 19. Accordingly, the supported portion 14 slides backward in the suspension support portion 18, and the engagement claw portion 15 at the lower end of the stopper arm 13 comes out of the engagement recess 11 of the spacer member 6 fixed to the inner diameter portion of the elbow strut 2. The engagement is released, and the elevating body 3 can be raised and lowered. When the user holds the elbow rest member 4 and raises and lowers the lifting body 3 by an appropriate height while holding the cover portion 27, and then releases the hand from the cover portion 27, the engaging claw is applied by the urging force of the spring body 19. The portion 15 projects from the inner diameter side of the lifting body 3 through the through hole 24, and the engaging claw portion 15 can be engaged with the engaging recess 11 of the spacer member 6 to hold the height position of the lifting body 3. .

  When the operation member 21 is disposed on the left and right outer sides of the lifting body 3, the engaging claw portion 15 of the stopper arm 13 is engaged with the spacer member 6 by pushing the cover portion 27 toward the left and right inner sides of the chair. What is necessary is just to comprise so that it may come out from the joint recessed part 11, and what is necessary is just to change the direction of the suspension support part 18, the stopper arm 13, and the spacer 6 of the suspension support body 17. FIG.

[Configuration of left and right rotation change of elbow rest and its position maintenance]
The elbow rest member 4 includes an elbow rest base body 4a and an elbow rest pad body 4b that detachably covers the upper side thereof. The rotation holding means 30 for rotating the direction of the elbow rest member 4 that is long in the front-rear direction in the lateral direction (the left-right direction of the chair) and holding the state after the rotation is fixed on the suspension support 17. A movable support 35 (corresponding to the support base in the claims) and a receiving seat 36 (corresponding to the buffer in the claims) disposed on the upper surface thereof for supporting the elbow rest base 4a with less resistance. And an elastic body 37 such as rubber that fits into a recess (second recess 56, which will be described later as an example) of the rotation support 35, and a cylindrical tube portion serving as a rotation center of the elbow rest base 4a 42, an arc portion 43 formed on the elbow rest base 4a and having a radius position larger than the radius of the cylinder portion 42 and concentric with the center of rotation of the cylinder portion 42, and a plurality of arc portions 43 provided on the arc portion 43 And a locking pin 38 that selectively engages one of the engaging recesses 39.

  In the embodiment, as shown in FIG. 11, the cylindrical portion 42 has a notch 44 in a part of the circumference, and the cylindrical portion 42 communicates with the arc portion 43 via the notched portion 44. A plurality of engaging recesses 39 provided at appropriate intervals in the circumferential direction are formed in a groove shape extending in the vertical direction on the inner peripheral surface of the arc portion 43. In the embodiment, three engagement recesses 39 are provided, and when the locking pin 38 is engaged with the engagement recess 39 at the center of the left and right, the posture is such that the longitudinal direction of the elbow rest member 4 is parallel to the longitudinal direction of the chair. Retained. When the locking pin 38 is engaged with the engagement recess 39 adjacent to the engagement recess 39 at the left and right center position, the direction of the elbow rest member 4 is held in a horizontally rotated posture by approximately 30 degrees. When the cylinder part 42 and the circular arc part 43 are provided separately and independently, the boss part 46 and the block 47 should just be spaced apart.

  As an example of the stopper means for restricting the maximum amount of rotation of the elbow rest base 4a, the left and right restricting surfaces 60 (see FIG. 11) on the part where the arc portion 43 of the elbow rest base 4a communicates with the notch 44; A pair of left and right restricting portions 49 (see FIG. 9) in the rotation support 35 described later is provided. In other words, when the elbow rest base 4a is horizontally rotated, the further rotation of the elbow rest base 4a is restricted at the place where the opposing restricting portion 49 and the restricting surface 60 come into contact with each other (FIG. 8). (See the two-dot chain line).

  The rotation support body 35 and the suspension support body 17 are die-cast products made of a metal material such as a zinc alloy, and the receiving seat body 36 is a molded product made of a synthetic resin having a low coefficient of friction such as polyacetal. As shown in FIG. 9, the rotation support 35 includes a seat portion 45, a boss portion 46 on the upper surface thereof, and a block 47 connected to the boss portion 46. The block 47 is formed with a bottomed first recess 48 that is open in the forward direction and the upward direction, and the left and right outer surfaces of the block 47 serve as the restriction portions 49. A square-shaped protrusion 45a on the lower end side of the first recess 48 of the seat 45 is formed to protrude forward. The seat 45 of the rotation support 35 is placed on the seat surface 17a of the suspension support 17 shown in FIGS. 12A and 12B, and the projection 45a is formed on the fitting portion 50 following the seat 17a. Fit. Further, a positioning projection 51 protruding upward from substantially the center of the seat surface 17a is fitted to the lower end of the female screw hole 52 formed in the boss portion 46. And since the rotation support body 35 is fixed with respect to the lower surface of the flange part 3a with the screw 63 from the upper end of a pair of right and left insertion attachment holes 61 (refer FIG. 7) in the flange part 3a of the upper end of the raising / lowering body 3. The suspension support body 17 is mounted so as to be immovable with respect to the rotation support body 35 by fitting the both.

  The receiving seat body 36 as a buffer body is a flat annular flange portion 53 placed on the flange portion 3 a at the upper end of the elevating body 3, and projects upward from the center portion of the flange portion 53 to the boss portion 46. It has a partially cutout cylindrical bearing portion 54 that fits outside, and a receiving body 55 that fits inside the first recess 48 (see FIG. 9). As described above, the receiving seat body 36 is externally fitted to the rotation support body 35 fixed to the lower surface side of the flange portion 3a. Accordingly, the flange portion 53 of the receiving seat body 36 is placed on the upper surface of the flange portion 3a. In FIG. 10A, the flange portion 3a is not shown. When the elbow rest base 4 a is placed on the receiving seat body 36, the cylindrical portion 42 is fitted on the bearing portion 54 to be in sliding contact, and the lower surface of the cylindrical portion 42 of the elbow rest base 4 a is in sliding contact with the flange portion 53. In order to reduce the sliding resistance between the upper surface of the flange portion 53 and the lower surface of the tube portion 42, a plurality of annular projecting ribs are provided on the upper surface of the flange portion 53.

  A cylindrical second recess 56 is formed in the receiving body 55. The second recess 56 is formed with an open groove 57 in a part of its front side surface (see FIG. 9). If the cylindrical elastic body 37 is inserted into the second recess 56, a part of the circumferential surface of the elastic body 37 is exposed within the width of the open groove 57. The width of the open groove 57 is set equal to the diameter of the locking pin 38. A through hole 58 is provided in the flange portion 53 below the open groove 57, and a bottomed support hole 59 is formed in the rectangular protrusion 45a below the through hole 58. The vertically extending locking pin 38 disposed in the open groove 57 fits into the support hole 59 through the through hole 58 of the flange portion 53. At this time, in the state where the back surface of the circumference of the locking pin 38 is in contact with a part of the circumferential surface of the elastic body 37, the front surface of the circumference of the locking pin 38 is outward from the opening groove 57. It protrudes (see FIGS. 10A and 10B). By setting the diameter of the support hole 59 to be slightly larger than the diameter of the locking pin 38, the locking pin 38 swings only on the circumferential surface side of the elastic body 37 and the opposite side across the opening groove 57. It is configured to be possible. In this case, the locking pin 38 swings around the support hole 59 (the lower end of the locking pin 38) as a fulcrum.

[Mounting method of this embodiment]
The stopper arm 13 is inserted from the lower end of the fitting hole 5 of the elevating body 3, and when the supported portion 14 of the stopper arm 13 comes to the position of the mounting hole 26, the rotation support body 35 is fitted on the suspension support body 17. In the combined state, it is inserted from the front of the mounting hole 26. The rotation support 35 is located on the lower surface side of the flange portion 3 a at the upper end of the elevating body 3. Next, the shaft of the screw 63 (see FIGS. 4 and 6) is inserted from the upper end of the pair of left and right insertion mounting holes 61 (see FIG. 7) in the flange portion 3a, and the screw 63 is inserted into the seat 45 in the rotating support 35. When screwed into the provided female screw portion, the rotation support 35 is fixed to the flange portion 3 a at the upper end of the elevating body 3. Next, the receiving seat body 36 is incorporated into the upper surface of the flange portion 53 and the rotation support body 35, and the elastic body 37 is fitted into the first recess 48 of the receiving seat body 36. A pair of insertion holes 62 (see FIGS. 9 and 10B) are provided in the annular flange portion 53 of the receiving seat body 36 so as to escape the heads of the screws 63. Further, the cylindrical portion 42 of the elbow rest base 4 a is fitted on the outer periphery of the bearing portion 54. At that time, the block 47 and the elastic body 37 of the rotation support 35 are opposed to each other at the arc portion 43. In a state where the opening groove 57 of the second recess 56 faces the engagement recess 39 at the center of the left and right, the locking pin 38 is inserted into the engagement recess 39 and the opening groove 57 and the gap from above. In this state, the locking pin 38 is urged by the elastic body 37 in the radially outward direction of the arc portion 43 (the inner peripheral surface direction of the arc portion 43). Next, the washer 40 is put on the cylinder part 42 of the elbow pad base 4 a and the bolt 41 is screwed into the female screw hole 52 in the boss part 46, so that the elbow pad base 4 a cannot be removed from the elevator 3 in the vertical direction. In addition, the elbow rest base 4a is mounted so as to be pivotable in the lateral direction about the pivot center (corresponding to the axis of the bolt 41) (see FIGS. 3 and 6). Further, by making the radius of the washer 40 slightly larger than the distance from the position of the locking pin 38 to the center of rotation of the elbow rest base 4a, the locking pin 38 can be prevented from coming off upward (see FIG. 3). ). Thereafter, the pad member 4b is placed on the elbow rest base 4a to be locked.

  With the above configuration, when the elbow rest member 4 is rotated in the lateral direction, the locking pin 38 urged by the elastic body 37 in the radially outward direction of the arc portion 43 is selectively selected as one of the engaging recesses 39. It can hold | maintain in the state which changed the direction of the longitudinal direction of the elbow rest member 4 by fitting. Further, when the elbow rest base 4a is horizontally rotated, the further rotation of the elbow rest base 4a is restricted at the place where the opposing restricting portion 49 and the restricting surface 60 come into contact with each other. Since the restricting portion 49 is made of metal, there is no possibility of damaging the restricting portion 49 even if a large lateral external force acts on the elbow rest member 4.

  Further, an arc portion 43 formed on the elbow rest base 4a and having a radius position larger than the radius of the cylinder portion 42 and concentric with the center of rotation of the cylinder portion 42 is appropriately spaced in the circumferential direction of the arc portion 43. The engagement pin 38 and the engagement recess 38 from the rotation center line of the elbow rest member 4 are selectively engaged with one of the engagement recesses 39 that is long in the vertical direction. Since the distance to the engagement position with 39 (arm length of the moment) can be set large, and the engagement resistance force between the engagement pin 38 and the engagement recess 39 can be increased, the elbow rest member at this engagement position There is an effect that the position holding force of the elbow rest member 4 can be increased as much as possible by increasing the rotational moment of 4. In other words, by arranging the arc portion 43, the engagement recess 39, the locking pin 38, and the elastic body 37 at the position in the front-rear direction (longitudinal direction) of the elbow rest member 4, the width dimension of the elbow rest member 4 is small. This also has a remarkable effect that the turning moment of the elbow rest member 4 at the locking position can be increased.

  Note that the receiving body 55 in the receiving seat body 36 of the above embodiment may be omitted, and the first recess 48 formed in the block 47 may be shaped so that the elastic body 37 fits tightly. Further, the cross-sectional shape of the elastic body 37 in the present invention may be any of an ellipse, a rectangle, and a polygon in addition to a circle. And as for the raising / lowering adjustment means of the raising / lowering body 3 of this invention, it is also possible to employ | adopt things other than the structure demonstrated above. The rotation holding means 30 of the present invention can also be applied to the elbow strut 2 that does not have the lifting body 3. In that case, the rotation support body 35 of the above embodiment may be fixed to the upper end portion of the elbow strut 2, and a support base corresponding to the rotation support body 35 is integrally formed on the upper end portion of the elbow support column 2. May be.

DESCRIPTION OF SYMBOLS 1 Armrest device 2 Elbow post 3 Lifting body 4 Elbow rest member 4a Elbow rest base 5 Fitting hole 6 Spacer member 11 Engagement recess 13 Stopper arm 17 Suspension support body 30 Rotation holding means 35 Rotation support body as rotation base 36 receiving body 37 as elastic body 37 elastic body 38 locking pin 39 engaging recess 42 cylindrical portion 43 arc portion 48 first recess 49 restricting portion 56 second recess 60 restricting surface

Claims (4)

An armrest device that is mounted so that the orientation of the elbow rest member can be changed and adjusted in a substantially horizontal direction with respect to the elbow strut,
The elbow rest member comprises an elbow rest base body and an elbow rest pad body covering the upper side thereof,
On the support base at the upper end of the elbow strut, a buffer body that is slidably in contact with the lower surface and the inner peripheral surface of the cylindrical portion that is the rotation center of the elbow rest base is externally fitted.
The elbow rest base is formed with a circular arc part concentric with the center of rotation of the cylinder part at a radial position larger than the radius of the cylinder part,
A plurality of engaging recesses are formed at appropriate intervals in the circumferential direction on the inner peripheral surface of the arc portion, and the buffer body or the support base includes one side of the inner peripheral surface of the arc portion. A recess having an open portion is provided in a facing direction, and an engagement pin is inserted between an elastic body disposed in the recess and an inner peripheral surface of the arc portion, and the engagement pin is elastic. The body is biased toward the inner circumferential surface of the arc part,
An armrest device in which one of the engaging recesses and the engaging pin are selectively engaged when the elbow rest member is rotated around the tube portion.   The armrest device according to claim 1, wherein the engagement pin is arranged to be displaceable in a radial direction of the arc portion. The cylindrical part has a notch part in which a part of the circumference is notched, and the arc part is formed to communicate with the notch part,
The armrest device according to claim 1 or 2, wherein stopper means for restricting a maximum amount of rotation of the elbow rest base is provided on the left and right sides of the portion where the arc portion communicates with the notch portion and the support base portion.   The armrest device according to any one of claims 1 to 3, wherein the elbow strut includes an elevating body that elevates and lowers the elbow rest member, and the support base is provided at an upper end of the elevating body.

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