JPH11155683A - Armrest device of chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armrest device of a chair in which an armrest section can be achieve right and left lateral movement and right and left angle control against a support section uprising from a seat section or a leg section, with an excellent control and a fine appearance, for moving the armrest section to right and left laterally controlling right and left angles, and maintaining a predetermined position and a predetermined angle without providing a control lever. SOLUTION: Sliders 52 are respectively engaged attaching to horizontal retaining plates 21 provided at front and rear edges of an inclining member 9 assembled on an upper edge of a support section 5. The retaining plates 21 are laterally moveably assembled through the sliders 52 to an internal upper surface of an upper covering member 26 by assembling plates 53. A guide groove 54 is provided to a width direction of the internal upper surface at a center sections of a front and rear of the upper covering member 26. A click member 55 is moveably engaged along the guide groove 54. A rotation axis 56 projected to a downward of the click member 55 is rotatably engaged to a circular hole 57 formed at a center section of an upper surface plate 19 of the inclining member 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armrest device for a chair, and more particularly, to an armrest device for a chair in which an armrest can be moved laterally and the angle can be adjusted.

[0002]

2. Description of the Related Art Heretofore, there have already been provided chairs in which an armrest can be adjusted up and down with respect to a support portion rising from a seat portion or a leg portion, or can be adjusted in a horizontal direction and a horizontal direction. As the left-right lateral movement and left-right angle adjustment mechanism of the armrest, a support member such as a metal plate fixed to the upper end of the support is positioned in a recess formed on the lower surface of the armrest, and the front and rear of the support member While supporting the end portion in a laterally movable manner with a holding member, the front and rear end portions of the support member and the continuous waveform engaging portion formed in the recess of the armrest portion are disengaged with an operation button and laterally moved left and right in multiple stages or There is one with a structure in which the left and right angles can be adjusted.

[0003] However, the conventional left and right lateral movement and left and right angle adjustment mechanisms of the armrest require an operation button for operating the mechanism. Conventionally, the operation button is provided at the center of the front and rear sides or the lower surface of the armrest. In addition to being provided on the front and rear portions, there are many portions where the mechanism portion is exposed on the lower surface of the armrest portion, and thus not only the appearance is poor, but also the operability remains a problem. Further, there is no structure in which the armrest portion can be adjusted in the vertical direction and a mechanism in which the horizontal movement and the horizontal adjustment mechanism are combined.

In a conventional vertical angle adjusting mechanism, an operation lever for engaging and disengaging an engagement projection with respect to an engagement recess is attached to a cover member constituting an armrest portion, while an operating member provided with the engagement projection is provided. Is attached to the tilting member, and the operating lever and the operating member are directly or indirectly linked to each other, or the engaging projection is integrally formed at the free end of the operating lever. Because of the structure in which the engaging pin and the like are locked, it has been impossible to laterally move or rotate the cover member of the armrest relative to the tilting member.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is intended to solve the problem described above in that the armrest can move laterally and adjust the lateral angle with respect to the support rising from the seat or the leg. In the armrest device of a chair, the armrest part can be moved left and right and left and right angles can be adjusted without providing an operation lever, while maintaining a predetermined position and a predetermined angle stably, and excellent in operability and appearance. To provide an armrest device for a seated chair.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an armrest apparatus for a chair in which an armrest can move laterally and adjust a lateral angle with respect to a support standing up from a seat or a leg. Sliders are respectively fitted to horizontal holding plates provided at front and rear ends of a tilting member attached to the upper end of the support portion, and can be laterally moved by the mounting plate on the inner upper surface of the upper cover member via the sliders. A guide groove is provided in the width direction of the inner upper surface at the front and rear central portions of the upper cover member, and a click member is movably fitted along the guide groove, and a rotation projecting below the click member is provided. An armrest device for a chair is provided in which a shaft is rotatably fitted in a circular hole formed in the center of the upper plate of the tilting member.

More specifically, a plurality of reinforcing ribs are formed in a grid pattern on the inner lower surface of the upper cover member, and the end faces of the reinforcing ribs are set to be flush with each other so as to surround the reinforcing ribs. A frame rib having a high height is formed, and a portion where no reinforcing rib exists in the width direction is formed at a center portion, and the portion is used as the guide groove. Further, the guide groove has both side walls formed by reinforcing ribs extending in the width direction, and a notch portion is formed at a center position in the width direction of the upper cover member and at a part of the side wall at the same distance from the center. , The click member,
An elliptical portion is formed on the upper surface to engage with the guide groove, and a rotating shaft is rotatably engaged with the circular hole of the tilting member on the lower surface. An elastic piece bent to one side surface of the elliptical portion is formed continuously at one end of the elastic piece, and a semi-cylindrical sliding part that is pressed against the side wall is formed at the tip of each elastic piece. preferable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 shows a chair according to the present invention, FIG. 2 shows a state in which the armrest is set horizontally, FIG. 3 shows a state in which the front part of the armrest is inclined upward, FIGS.
FIG. 15 shows details of each part, where reference numeral 1 denotes a leg of a chair,
Reference numeral 2 denotes a seat portion, 3 denotes a backrest portion, 4 denotes an armrest device, 5 denotes a support portion, and 6 denotes an armrest portion.

The armrest device 4 according to the embodiment of the present invention comprises:
An armrest 6 is provided with respect to a support 5 rising from the seat 2 or the leg 1 so that the height can be adjusted, the vertical angle can be adjusted, the horizontal movement can be performed, and the horizontal angle can be adjusted. However, the armrest device 4 according to the present invention is characterized by the vertical angle adjustment mechanism, the horizontal movement, and the horizontal angle adjustment mechanism.
It is not essential whether the armrest 6 is adjustable in height.

The support section 5 includes a support arm 7 and an elevating body 8.
And has a structure in which a vertically open hollow cylindrical lifting / lowering body 8 attached to an armrest 6 is vertically movably fitted on a support arm 7 fixed to the seat 2. A height adjusting mechanism is provided between the support arm 7 and the elevating body 8 to adjust the height of the elevating body 8 with respect to the supporting arm 7 and maintain the height.

The vertical angle adjusting mechanism is shown in FIGS.
As shown in FIG. 2, a tilting member 9 attached to the upper end of the support portion 5 so as to be able to move and / or rotate in an armrest portion 6 is connected by a horizontal support shaft 10 so as to be vertically tiltable. An operating lever 11 is attached to the front of the supporting member 5 so as to be tiltable up and down so that the operating portion 12 is exposed from the lower surface. The operating rod 15 extending forward of the rotating member 14 pivotally attached to the front portion of the tilting member 9 contacts the upper surface of the operating lever 11 and the operating rod 16 extending downward of the rotating member 14 The engagement pin 17 locked at the tip is made engageable with the engagement recess 13, and the rotation member 14 is further rotated in the rotation direction in which the engagement pin 17 engages the engagement recess 13. Elastically biased by an elastic body 18 provided between the It is.

More specifically, the tilting member 9 is formed by bending a metal plate. The side plates 20, 20 hang down on both side edges of the upper plate 19, and the front and rear ends of the upper plate 19 are extended. Holding plates 21 and 21 are formed, and the front portion of the side plate 20 is shaped to expand downward. Shaft holes 22 for inserting the support shaft 10 are formed at the rear of the side plates 20, and the rotating member 14 is provided at the upper end of the front part of the side plates 20. Through holes 24, 24 for inserting a pivot pin 23 rotatably supported are formed, and a locus of movement of the engagement pin 17 with the rotation of the rotation member 14 is provided at a lower end of a front portion. , That is, the elongated holes 25, 25 facing the shaft hole 22 are formed.
7 are slidably engaged at both ends.

The armrest 6 is formed by joining an upper cover member 26 and a lower cover member 27 made of synthetic resin to make the interior hollow.
, The tilting member 9 is attached so as to be able to move laterally and rotatably, and the lower cover member 27
Of the operation lever 11 and the opening 28 for receiving the
An operation hole 29 for exposing 2 is formed.

The operation lever 11 has shafts 30, 30 formed on a plate-like base portion, and the operation portion 12 protrudes from a lower portion on the free end side. The lateral width of the operation lever 11 is different from that of the cover members 26 and 2 with respect to the tilting member 9.
7 does not always move even if it is moved laterally or rotationally displaced.
The operation lever 15 is set wide enough so that the tip of the operation lever 15 contacts the upper surface of the operation lever 11. The shaft portion 30 has a shape that is flat in the direction orthogonal to the plate surface of the operation lever 11, and protrudes inward from the lower cover member 27 to pivotally support the shaft portion 30. The bearing portion 31 is provided with a gap corresponding to the flat width of the shaft portion 30 on the rear side, and has a bearing hole 32 therein for rotatably receiving the shaft portion 30 therein.
With the operation lever 11 raised, the shaft portion 30 is inserted into the bearing hole 32, and then the operation portion 12 is tilted and attached so as to be inserted into the operation hole 29. In this mounting state, the shaft portion 30 does not fall out of the bearing hole 32.

The rotating member 14 has a shaft barrel 33 formed at the center thereof for inserting the shaft pin 23, and the operating rod 15 extends forward from the shaft barrel 33. The part is parallel to the upper surface of the operation lever 11, and the operating rod 16 extends downward from the shaft cylinder 33, and the tip of the operating rod 16 has a U-shaped engagement for receiving the engaging pin 17. It is a part 34.

The engaging recesses 13,... Form both side pieces 36 of a metal rack member 35 formed in a substantially U-shape in plan view, and the rack member 35 is formed by an upper front end of a block body 37 made of synthetic resin. The rack member 35 is fixed to the upper end of the elevating body 8 by fitting the block body 37 into the upper end of the cylindrical elevating body 8. A plurality of engaging recesses 13,... Here, a downward engaging claw 38 is formed at the upper edge of the front surface of the block body 37, and a horizontal support piece 39 is protrudingly provided below the upper surface of the block body 37, and an upper front face of the support piece 39 is provided. The rack 40 has a projection 40 formed thereon, and the upper edge of the board 41 of the rack member 35 is engaged with the engaging claw 38, and the lower edge is in contact with the support piece 39 and the engagement formed on the board 41. The hole 42 is fitted into the projection 40, and in this state, the block body 37 is inserted into the upper end of the elevating body 8, and the both side pieces 36, 36 of the rack member 35 abut on the inner surface of the elevating body 8. The rack member 35 is completely fixed.

A sliding hole 44 is formed in the block 37 so as to slidably receive a metal support plate 43 provided at the upper end of the support arm 7 therein. Further, the structure for fixing the block body 37 to the elevating body 8 is constituted by a vertical plate 45 integrally formed inside the elevating body 8.
The claw pieces 47 provided at the lower end of the front surface of the block body 37 are engaged with the locking holes 46 provided in the
7 is fitted between a pair of holding pieces 49, 49 provided at the rear end of the upper end of the elevating body 8 and shaft holes 50, 50 provided in the holding pieces 49, 49. The shaft hole 51 provided in the bearing portion 48 and the shaft hole 51 are used as a common hole, and the armrest portion 6 is connected through a support shaft 10 that pivotally supports the armrest portion 6 in a vertically rotatable manner.

In order to adjust the vertical angle of the armrest portion 6, the operating portion 12 of the operating lever 11 is pushed upward, and the operating lever 11 is rotated upward to rotate the rotating member 1.
4 is pushed up on its upper surface, and
Rotates against the elastic urging force of the elastic body 18, and the engaging pin 17 locked to the distal end of the operating rod 16 moves in the elongated holes 25, 25 of the tilting member 9, and moves from the engaging recess 13. In this state, it becomes possible to rotate the front part of the armrest part 6 up and down around the support shaft 10. When the finger is released from the operation part 12 after setting at a predetermined angle, the elastic body 18 has elasticity. The engagement pin 17 is engaged with the corresponding engagement recess 13 by the force, and maintains the set angle.

As the elastic member 18, the rotating member 1 is used.
4 shows an example in which a coil portion is wound around the shaft cylinder 33 and a kick spring in which both elastic legs are locked to the upper surface plate 19 of the tilting member 9 and the operating rod 15 is used. Can be used. However, the tilting member 9
On the other hand, since the upper cover member 26 and the lower cover member 27 are relatively displaced, the elastic body 18 should be provided between the pivoting member 14 displaced together with the tilting member 9 and the tilting member 9.

Next, the left-right lateral movement and left-right angle adjustment mechanism of the armrest 6 will be described with reference to FIGS. 2, 3, 5, and 7-11. The left and right lateral movement and left and right angle adjustment mechanisms respectively fit sliders 52 and 52 on horizontal holding plates 21 and 21 provided at the front and rear ends of the tilting member 9, respectively, and use the upper cover member via the sliders 52 and 52. A mounting groove 53 is provided on the inner upper surface of the upper cover member 26 so as to be laterally movable, and a guide groove 54 is provided in the width direction of the inner upper surface of the upper cover member 26 so that the click member 55 can be moved along the guide groove 54. The tilting member 9 is rotatably fitted into a circular hole 57 formed at the center of the upper surface plate 19 of the tilting member 9 while being fitted. That is, the angle of the armrest 6 can be adjusted horizontally about the rotation axis 56, and the armrest 6 can be moved laterally by sliding the guide groove 54 with respect to the click member 55. You can do it.

More specifically, a large number of reinforcing ribs 58 are formed in a lattice pattern on the inner lower surface of the upper cover member 26 in the vertical and horizontal directions, and the end faces of the reinforcing ribs 58 are set to be flush with each other. A frame rib 59 having a high height is formed so as to surround the frame 58, and a portion where the reinforcing rib 58 does not exist in the width direction is formed in the center portion, and the portion is formed as the guide groove 54. The guide groove 54 has side walls 58A, 58A formed by reinforcing ribs 58, 58 extending in the width direction, and the center position in the width direction of the upper cover member 26 and the side wall 58A at the same distance from the center. , 58A with a cutout 6
0, ... are formed.

As shown in FIG. 9, the click member 55 is made of a synthetic resin having a substantially circular outer shape in plan view, and has an elliptical portion 61 which engages with the guide groove 54 on the upper surface side, and has a lower surface side. A rotary shaft 56 rotatably engaged with the circular hole 57 of the tilting member 9 is formed at an intermediate portion between the upper and lower portions. An elastic piece 62 is formed on one side surface of the elastic piece 62, and the elastic piece 62 similarly extends from the other end of the oval portion 61. At the tip of each of the elastic pieces 62, 62, a semi-cylindrical sliding portion 63, 63 is provided. Are formed at the same height as the elliptical portion 61. Further, concave portions 64, 64 for retracting the sliding portions 63, 63 are formed on both side surfaces of the oblong portion 61 corresponding to the sliding portions 63, 63. Then, with the rotation shaft 56 of the click member 55 inserted into the circular hole 57 of the upper surface plate 19 of the tilting member 9, the oval portion 61 of the click member 55 is elastically inserted into the guide groove 54 of the upper cover member 26. And the sliders 5 at the front and rear ends of the tilting member 9
2 and 52 are movably held and mounted by mounting plates 53 and 53 screwed to the frame rib 59 of the upper cover member 26. Here, the mounting plate 53 has a fixing portion 65 to be attached to the frame rib 59, a pressing portion 66 that slides on the upper surface of the slider 52, and a vertical portion 67 between the fixing portion 65 and the pressing portion 66. The vertical portion 67 has a horizontally long opening 68 through which the slider 52 is inserted. The mounting plate 53
In a state where the slider 52 is held, the slider 52 slidably contacts the holding portion 66 and the fixing portion 65, and in order to secure the contact pressure, the slider 52 is low inside the fitting of the holding plate 21. A plurality of ribs 69 are formed.

The oval portion 6 of the click member 55
1 is engaged between both side walls 58A, 58A of the guide groove 54, and both sliding portions 63, 63 are elastically pressed against the side walls 58A, 58A. As shown in FIG.
Is moved in the left and right direction, the click member 55 relatively moves along the guide groove 54, and the sliding portions 63, 63 are located at the center of the guide groove 54 and the notches 60,. Then it stops at that position due to its elastic force,
When the armrest 6 is strongly moved, the sliding portions 63 move away from the notches 60. That is,
The armrest 6 can be adjusted by laterally moving the armrest 6 to the center and to the left and right with respect to the support 5. When the armrest 6 is positioned at the center with respect to the support 5, the armrest 6 can be rotated left and right about the rotation shaft 56 by a predetermined angle, so that the left and right angles can be adjusted.

Here, the joint structure between the upper cover member 26 and the lower cover member 27 will be briefly described. An inner step 70 is formed on the periphery of the upper cover member 26 along its inner edge, and an outer step 71 is formed on the periphery of the lower cover member 27 along its outer edge. Are adapted. Then, a protrusion 72 is provided inward on one of the front and rear inner step portions 70 of the upper cover member 26.
And a connection hole 73 for engaging the projection 72 on the outer step 71 on the corresponding side of the lower cover member 27.
Pedestals 74, 74 are formed inside the other front and rear of the upper cover member 26, and mounting holes 75, 75 are formed on the corresponding side of the lower cover member 27. At the same time, the screws 76 inserted into the mounting holes 75 from below are screwed to the pedestals 74 and joined to each other. Further, since both members are made of synthetic resin, when the both side surfaces are pressed, the inward deformation of the upper cover member 26 is suppressed by the fitting relationship between the inner step 70 and the outer step 71. The inward deformation of the lower cover member 27 cannot be suppressed only by the fitting relationship between the inner step 70 and the outer step 71. Therefore, at the peripheral edge of the upper cover member 26, regulating claws 77 continuous from the frame rib 59 are provided so as to protrude, and the regulating claws 77 prevent inward deformation of the lower cover member 27.

As described above, the armrest 6 is supported by the support 5
The horizontal width of the opening 28 formed in the lower cover member 27 is set to be wide in consideration of the horizontal moving distance, and the vertical angle can be adjusted. The opening 28
The front and rear width is set wide with some margin. Therefore, when the front portion of the armrest portion 6 is raised and inclined upward, if the protective cover 78 is not provided, as shown in FIG. 3, the bracket such as the tilting member 9 and the peripheral portion of the support shaft 10 are exposed, Since the finger may be pinched in the exposed portion, the tilting member 9
5, a protective cover 78 is provided as shown in FIG. 5, FIG. 6, FIG. 12, and FIG. When the armrest 6 is moved right and left with respect to the support 5, the finger is not pinched between the protective cover 78 and the edge of the opening 28, and even if the finger is pinched. A gap of at least 6 mm is formed to prevent injuries.

The protective cover 78 is located in the opening 28 of the lower cover member 27, and is fitted on the tilting member 9 by being fitted thereto. The outer shape of the protective cover 78 has an upwardly expanding shape, an opening 79 for receiving the supporting portion 5 is formed at the center, and a protruding piece 80 is provided at the front end, and both sides of the tilting member 9 are provided. The engaging claws 83, 83 formed on the inner surfaces of the rear portions of the side plates 82, 82 are engaged with the concave portions 81, 81 formed on the front ends of the face plates 20, 20, and the rear portions of the side plates 20, 20 of the tilting member 9. Engagement holes 84, 8 formed in
4 and is attached by retaining engagement. Notch openings 85 are formed in the front and rear portions of the protective cover 78 to release the operation of the rotating member 14 and to release the side plates 20, 20 of the tilting member 9. Also, both side plates 82, 8
A vertical rib 86 is formed on the inner surface of the lifting member 8 so as to be elastically fitted to the upper end of the lifting body 8. The shape of the protective cover 78 should be determined according to the shape of the tilting member 9, and the shape is not particularly limited.

FIG. 14 shows another example of the left and right lateral movement and left and right angle adjustment mechanism of the armrest 6 shown in FIG.
A shaft 87 is protruded from the center of the top plate 19 of the tilting member 9, and the shaft 87 is opened at its center and C-shaped engaging portions 88, 88 elastically engaged at both left and right sides thereof. The projections are provided on the lower surface of the upper cover member 26 with the portions facing each other. In this case, when the shaft portion 87 is engaged between the two engaging portions 88, 88, the armrest 6 can be adjusted in the right and left angles, and if the shaft portion 87 is fitted into one of the engaging portions 88, It will move left and right and sideways.

Further, the armrest 6 according to the present embodiment can be moved horizontally from side to side, so that the width is inevitably increased.
Although it is difficult to operate the operation unit 12 of the operation lever 11 provided on the lower surface, in order to improve operability, inclined surfaces 27A, 27A are formed on the lower surfaces on both left and right sides of the lower cover member 27, and the operation unit of the finger is formed. The wraparound to 12 is improved.

Finally, the height adjusting mechanism will be briefly described with reference to FIGS. The height adjusting mechanism forms a vertical hole 89 along the center of the support plate 43 extending at the upper end of the support arm 7, and engages with the engaging recesses 90, at predetermined intervals on the front edge of the vertical hole 89. Are formed, and an opening 91 is formed at a position corresponding to the support plate 43 at a front portion of the elevating body 8, and a guide portion 92 extending forward and backward is formed inside the opening 91. A pair of operating members 94 and 95 are provided in the guide portion 92 to slidably move the engaging pins 93 penetrating through the engaging recesses 90 or the vertical holes 89 from front and rear. An operation body 98 is provided between the member 95 and the inner wall 96 of the elevating body 8, with an elastic body 97 made of a compression coil spring being elastically urged forward, and an upper and lower end pivotally attached to the opening 91 so as to be able to rotate back and forth. The elastic piece 99 integrally formed at the free end of the outer working member 9 It is made in contact with.

When the height of the armrest 6 is adjusted, the lower part of the operating lever 98 is pushed into the opening 91, and the engaging pin 93 is further pressed against the elastic biasing force of the elastic body 97. Is pushed in and reaches the position of the vertical hole 89, the height of the armrest 6 can be adjusted by holding the armrest 6. When the armrest 6 is moved up and down to a predetermined height with the armrest 6, the finger is released from the operation lever 98 and the elastic body 9 is released.
The engagement pin 93 is engaged with any of the engagement recesses 90 by the elastic biasing force of the front of the actuator 7, and the set height is maintained.

[0031]

As described above, the armrest device for a chair according to the present invention is an armrest device for a chair in which the armrest portion can move laterally and adjust the horizontal angle with respect to the support portion rising from the seat or the leg. The armrest can be moved laterally and the left and right angles can be adjusted without providing a lever, and the armrest can be stably maintained at a predetermined position and at a predetermined angle. It is excellent in operability and appearance.

[Brief description of the drawings]

FIG. 1 is a side view of a chair to which an armrest device of the present invention is applied.

FIG. 2 is a longitudinal sectional view when the armrest is set in a horizontal state.

FIG. 3 is a longitudinal sectional view when the armrest is set to an inclined state.

FIG. 4 is an exploded perspective view showing a structure for pivotally connecting a support portion and an armrest portion.

FIG. 5 is an exploded perspective view showing a main part of the present invention.

FIG. 6 is an exploded perspective view showing a relationship between a tilting member and a protective cover.

FIG. 7 is an exploded sectional view showing a structure of a cover member of an armrest.

FIG. 8 is a perspective view of an upper cover member.

9A and 9B show a click member, wherein FIG. 9A is a plan view and FIG. 9B is a side view.

FIG. 10 is a partial sectional view showing a state where a click member is mounted.

FIG. 11 is a simplified cross-sectional view showing a left-right lateral movement and left-right angle adjustment mechanism.

FIG. 12 is an omitted side view showing a state where a protective cover is attached.

FIG. 13 is a bottom view similarly omitted.

FIG. 14 is an abbreviated cross-sectional view showing another example of the left-right lateral movement and left-right angle adjustment mechanism.

FIG. 15 is a simplified explanatory diagram showing an operation state of an operation lever by putting a hand on an armrest;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg part 2 Seat part 3 Backrest part 4 Armrest device 5 Support part 6 Armrest part 7 Support arm 8 Elevating body 9 Tilting member 10 Support shaft 11 Operating lever 12 Operating part 13 Engaging concave part 14 Rotating member 15 Operating rod 16 Actuation Rod 17 Engagement pin 18 Elastic body 19 Top plate 20 Side plate 21 Holding plate 22 Shaft hole 23 Shaft pin 24 Through hole 25 Long hole 26 Upper cover member 27 Lower cover member 28 Opening 29 Operation hole 30 Shaft portion 31 Bearing portion 32 Bearing Hole 33 Shaft barrel 34 Locking part 35 Rack member 36 Side piece 37 Block body 38 Engagement claw 39 Support piece 40 Projection 41 Board 42 Engagement hole 43 Support plate 44 Sliding hole 45 Vertical plate 46 Locking hole 47 Claw piece 48 Bearing part 49 Holding piece 50 Shaft hole 51 Shaft hole 52 Slider 53 Mounting plate 54 Guide groove 55 Click member 56 Rotating shaft 57 Circular hole 58 Reinforcement Bu 59 Frame rib 60 Notch 61 Elliptical part 62 Elastic piece 63 Sliding part 64 Depression 65 Fixed part 66 Holding part 67 Vertical part 68 Horizontal opening 69 Rib 70 Inner step 71 Outer step 72 Projection 73 Connection hole 74 Base 75 Mounting hole 76 screw 77 regulating claw 78 protective cover 79 opening 80 protruding piece 81 concave part 82 side plate 83 locking claw 84 engaging hole 85 cutout opening 86 rib 87 shaft part 88 engaging part 89 vertical hole 90 engaging concave part 91 opening 92 Guide part 93 Engagement pin 94 Operating member 95 Operating member 96 Inner wall 97 Elastic body 98 Operating lever 99 Elastic piece

Claims (3)

[Claims] 1. An armrest device for a chair in which an armrest can move laterally and adjust a horizontal angle with respect to a support part standing up from a seat or a leg, and a front and rear part of a tilting member attached to an upper end of the support part. A slider is fitted to each of the horizontal holding plates provided at the ends, and is mounted on the inner upper surface of the upper cover member via the slider so as to be laterally movable by a mounting plate. A circular groove formed in the center of the upper plate of the tilting member, while a guide groove is provided in the direction, a click member is movably fitted along the guide groove, and a rotation shaft projecting below the click member is formed in the center of the upper plate of the tilting member. An armrest device for a chair, wherein the device is rotatably fitted to the armrest. 2. A plurality of reinforcing ribs are formed on the inner lower surface of the upper cover member in a grid pattern in a matrix, and the end faces of the reinforcing ribs are set to be flush with each other, and the height of the reinforcing ribs is set so as to surround the reinforcing ribs. 2. The armrest device for a chair according to claim 1, wherein a high frame rib is formed, a central portion is formed with a portion where no reinforcing rib is present in the width direction, and the portion serves as the guide groove. 3. The guide groove has both side walls formed by reinforcing ribs extending in the width direction, and a notch is formed at a center position in the width direction of the upper cover member and at a part of the side wall at the same distance from the center. And the click member has an upper surface formed with an oblong portion engaging with the guide groove, and a lower surface formed with a rotary shaft rotatably engaged with a circular hole of the tilting member, and a vertical intermediate portion. Elastic pieces bent to one side of the elliptical part are formed at the front and rear parts of the elliptical part, and a semi-cylindrical slide is pressed against the side wall at the tip of each elastic piece. 3. The armrest device for a chair according to claim 1, wherein the armrest portion is formed.