JP4383907B2 - Chair armrest equipment - Google Patents

Description

  The present invention relates to an armrest device for a chair that can adjust the position of the armrest in the front-rear direction according to the physique of a seated person, the work content, and the like.

As this type of conventional armrest device, the protrusions of the elastic tongue pieces on the position adjusting member placed on the upper end of the armrest support rod are selectively inserted into the front and rear concave grooves provided in the center of the lower surface of the armrest. In addition, there is one in which the position in the front-rear direction of the armrest can be adjusted stepwise by engaging elastically (for example, see Patent Document 1).
JP 2000-279265 A (FIGS. 5-7, etc.)

In the armrest device described in the above-mentioned patent document, when the elbow rest is moved in the front-rear direction, a pair of left and right is provided on the lower surface of the arm rest to prevent wobbling in the left-right direction and to move stably. A guide member is attached, and both side portions of a movable plate provided on the armrest support rod side are slidably fitted in guide grooves formed on opposing surfaces of both guide members.
For this reason, the number of parts and assembly man-hours are large, and the structure is complicated, resulting in high costs.

  The present invention has been made in view of the above-mentioned problems, and can easily adjust the position of the elbow rest in the front-rear direction with a small number of parts so that the cost can be reduced. It aims to provide an armrest device.

According to the present invention, the above problem is solved as follows.
(1) An armrest of a chair, in which an elbow rest comprising a pad member and an elbow rest base plate to which the pad member is fixed is mounted on an elbow rest supporting plate at the upper end of the elbow rest supporting rod so as to be movable in the front-rear direction. In the apparatus, a long hole facing in the front-rear direction in which both upper and lower ends open is provided at the center of the elbow pad, and a pair of front and rear guide protrusions erected on the elbow pad support plate are provided in the long hole. A fitting piece that can be moved relative to each other in the front-rear direction, and a holding piece that is inserted into the long hole on the lower surface protrudes downward from the upper end of both guide protrusions. A large holding plate is attached so as to allow the back and forth movement of the elbow rest substrate, and a rectangular fitting hole extending in the vertical direction extending toward the holding piece at the center of the holding plate, and its front and rear A pair of left and right mating holes that communicate with each other at the center of the direction Are provided so that the left and right fitting holes open on both the left and right sides of the holding piece, respectively, and the rubber-like elastic body and the left and right side surfaces thereof are provided in the square fitting hole and the pair of left and right fitting holes, respectively. A pair of left and right engaging pins that are urged by the actuator, and the elbow rest substrate is moved in the front-rear direction so that a part of the outer peripheral surface of the left and right pair of engaging pins is in the vertical direction of the holding grooves of the multiple provided side by side in the longitudinal on the opposite surface of the left and right of the slot, you as capable of selectively elastic engagement.

(2) In the above item (1), the slide plate is placed on the upper surface of the elbow rest substrate, and the frame-shaped guide projecting on the lower surface thereof facing the front-rear direction is fitted into the elongated hole of the elbow rest substrate. The space surrounded by the frame-shaped guide is a long hole into which the guide protrusion of the elbow support plate is fitted, and a plurality of front and rear holding grooves are provided on one of the left and right opposing surfaces of the long hole. .

According to the first aspect of the present invention, the elbow rest is movably fitted with a pair of front and rear guide projections erected on the elbow rest support plate in a long hole facing the front and rear direction of the elbow rest substrate. At the same time, it can be stably moved in the front-rear direction with a simple configuration in which the holding plate provided on the elbow pad is simply attached to the guide projection.
Therefore, the number of parts and the number of assembling steps can be reduced and the cost can be reduced as compared with the conventional one.
In addition, since the elastic body made of one rubber can bias the pair of left and right locking pins toward the holding groove, the number of parts is reduced and the left and right locking pins are made uniform by the elastic body. Since the holding groove and the locking pin are directed in the vertical direction with a strong force, the engaging area of the elbow rest is increased in the vertical direction. Therefore, there is no fear that the elbow rest whose front-rear position is adjusted moves in the front-rear direction with a small external force.
Furthermore, the position in the front-rear direction can be easily adjusted stepwise by the number of the holding grooves only by holding the elbow rest by hand and pushing it in the front-rear direction.

  According to the second aspect of the present invention, by providing the holding groove in the long hole of the frame-shaped guide in the slide plate that is separate from the elbow pad, the interval between the holding grooves can be made different so that When it is desired to change the adjustment interval, it is only necessary to replace the slide plate, and it is not necessary to replace the entire elbow rest substrate, which is economical.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a right armrest device whose lower end is fixed to a seat or the like of a chair (not shown), FIG. 2 is a side view of the main part shown in a vertical section, and FIG. 3 is an exploded perspective view of the main part. FIG.

  Since the armrest device (1) is symmetrical and has the same configuration, only the right side device will be described.

  The armrest device (1) includes an armrest strut (3) made of metal pipe that is attached to a chair seat or the like with a bracket (2) in a slightly forwardly inclined manner (hereinafter described with the left side in FIG. 2 as the front). In addition, a rectangular tube-shaped elbow rest support rod (4) fitted to the upper portion thereof via a height adjusting device (not shown) and a lower surface of the central portion in the front-rear direction are substantially horizontal at the upper end. And a support cover (7) formed by projecting an operation knob (6) linked to the height adjusting device on the front surface of the upper end.

  The support shaft (9) at the center of the upper surface of the horizontal and disk-shaped substrate (8) fixed to the upper end of the elbow pad support rod (4) has substantially the same diameter as the substrate (8) and is located at the center of the upper surface. A pair of dowel pins (12) and countersunk screws (12) projecting on the lower surface are fitted in the shaft hole at the center of the elbow rest support plate (11) made of hard synthetic resin with the support cylinder (10) standing upright. 13) to prevent rotation and fix (see Fig. 2).

  On the upper surface of the elbow support plate (11), there is a rotating support (14) having a generally inverted frustoconical shape, and a shaft hole (15) formed at the center thereof is fitted to the support cylinder (10). It is mounted rotatably.

  The rotary support (14) has a circular retainer plate (16) placed on the diameter-expanded step (15a) at the upper end of the shaft hole (15), and the bolt (17) inserted through the center is attached to the above-mentioned support. By screwing it into the female screw hole (18) of the shaft (9), it is prevented from coming off upward.

  When the bolt (17) is tightened, the upper end of the support shaft (9) is slightly protruded from the upper surface of the support cylinder (10) so that the rotary support (14) is not fixed to the support cylinder (10). A slight gap is formed between the lower surface of the presser plate (16) and the upper surface of the support tube (10).

  As shown in the bottom view of FIG. 4, an arcuate groove (19) recessed upward is formed in the rear half of the lower surface of the rotating support (14), and the inner peripheral edge is continuous with the shaft hole (15). In this concave groove (19), an arcuate rotation angle restricting member (20) that complements the concave groove (19) is provided with protrusions (20a) at both ends in the circumferential direction, and the concave groove (19). By engaging in engagement grooves (19a) formed at both ends in the circumferential direction, the movement in the radial direction and the circumferential direction is prevented and the engagement is performed.

  On the inner peripheral surface of the rotation angle restricting member (20), contact pieces (21a) (21b) having different thicknesses in the circumferential direction are formed at both ends in the circumferential direction, and their opposing surfaces An arc-shaped angle restricting groove (21) centered on the shaft hole (15) is formed as a stopper surface (21c).

  The angle restricting groove (21) is slightly biased outward (inward in plan view) with respect to a center line (L) that bisects the rotating support (14) in the left and right directions. That is, in this embodiment, the angle from the center line (L) to the stopper surface (21c) of the thick contact piece (21a) is approximately 30 °, and the stopper surface (21c) of the thin contact piece (21b) is the same. The angle up to is approximately 60 °.

  FIG. 5 shows a rotation support body (14) having the same shape as that described above, which is used in a left armrest device (not shown). As a result, the position of the angle restricting groove (21) of the rotation angle restricting member (20) is symmetrical in the left and right rotating supports (14). Thereby, the amount of inward and outward rotations of the left and right elbow pads (5) can be made symmetrically equal.

  In the angle regulating groove (21), as shown in the cross-sectional view of FIG. 6, a prismatic stopper projection (22) projecting rearwardly at the lower rear surface of the support tube (10) is a circular shape. It is slidably fitted in the circumferential direction.

  When the rotating support (14) is rotated around the support cylinder (10), the stopper surfaces (21c) (21c) at both ends of the angle restricting groove (21) are in contact with both side surfaces of the stopper projection (22). Thus, the maximum amount of inward and outward rotation of the rotary support (14), that is, the elbow rest (5) attached thereto, is regulated.

  As shown in FIG. 6, the front end of the rotary support (14) facing the stopper projection (22) by 180 ° is close to the shaft hole (15) and has a bottom with a substantially square cross section and an upper end. The fitting hole (23) is formed, and an elastic body (24) such as rubber is fitted into the fitting hole (23).

  Further, a communication hole (25) communicating with the rear surface of the fitting groove (23) and the shaft hole (15) is formed in the vertical direction, and the communication hole (25) The front and rear locking pins (26) face the front end outer peripheral surface against the rear surface of the elastic body (24), and the rear outer peripheral surface slightly protrudes into the shaft hole (15). It is fitted so that it can move in the direction.

  On the outer peripheral surface on the front side of the support cylinder (10), there are a plurality of (for example, four) arcuate engaging grooves (27) facing in the vertical direction to which the rear surface of the locking pin (26) can be fitted. , And spaced apart by a predetermined angle (for example, 30 °) in the circumferential direction.

  The engagement groove (27) located in the center is formed on a center line that bisects the support cylinder (10) into left and right, and when the locking pin (26) is engaged with the engagement groove (27), The elbow rest (5) is stopped so as to face straight forward and backward (state of FIG. 6).

  The elbow rest (5) has a substantially rectangular shape in plan view facing the front-rear direction, and has an elbow rest substrate (28) made of hard synthetic resin having an upward frame-shaped piece (28a) on the upper surface of the outer peripheral portion, and its upper surface. The pad member (29) is fixed to the pad member (29), and the pad member (29) has an L-shape in a side view as viewed from the side projected from the upper surface of the rear end of the elbow rest substrate (28). The pair of engaging pieces (30) are locked, and the lower surface of the front end is screwed with the screw (31) inserted from below the elbow pad (28), so that the elbow pad (28) is fixed. Fixed to the top surface.

  As shown in FIGS. 2 and 3, a rectangular frame-shaped guide (32) facing the front-rear direction and facing the front-rear direction at the center of the lower surface in the concave portion on the upper surface of the elbow rest substrate (28) slightly rearward. A rectangular slide plate (33) made of a hard synthetic resin projecting downward) is surrounded by a plurality of reinforcing ribs (34) and the like, and is housed in an empty manner.

  The frame-shaped guide (32) is open at both the upper and lower ends, and is fitted into a rectangular long hole (35) facing in the front-rear direction that is drilled in the center of the elbow rest board (28) slightly to the rear. Has been.

  The space surrounded by the frame-shaped guide (32) is a guide slot (32a) facing in the front-rear direction, and a plurality of arc-shaped holding grooves (36) facing in the up-down direction are formed on the left and right opposing surfaces thereof. Are formed at equal intervals in the front-rear direction (see FIGS. 7 and 8).

  The elbow pad (28) is attached to the upper surface of the rotary support (14) as follows.

  As shown in FIGS. 2 and 3, the guide slot (32 a) of the frame-shaped guide (32) is slidably fitted to the slightly recessed upper surface of the rotary support (14). A pair of prismatic guide protrusions (37) and (37) are erected so as to face each other across the shaft hole (15).

A notch groove (38) is formed in the opposing surface of both guide protrusions (37) and opens to the opposing surface and the upper end.
(39) is a synthetic resin square holding plate, and the guide long hole (32a) of the frame-shaped guide (32) is inserted into the center of the lower surface of the holding plate, and the guide projection (37) A holding piece (40) is provided in the notch groove (38) so that both front and rear ends are fitted.

  In addition, a central fitting hole (41) facing in the front-rear direction and a pair of left and right arc-shaped fitting holes (42), (42) are formed in the central portion slightly forward of the holding plate (39). It is formed so as to communicate with each other toward the inside of the holding piece (40) .In the fitting holes (41) and (42), an elastic body (43) such as rubber and a locking pin (44 Are fitted so as to come into contact with each other.

The left and right fitting holes (42) are open on both the left and right sides of the holding piece (40), and the left and right outer peripheral surfaces of the locking pins (44) fitted to the holding pieces (40) extend from the left and right sides of the holding piece (40). It protrudes slightly and selectively engages with each holding groove (36) of the frame-shaped guide (32).

The guide elongated holes (32a) of the frame-shaped guide (32) in the slide plate (33) are fitted to both guide protrusions (37) of the rotating support (14) through the spacer plate (45), After placing the elbow rest board (28) on the rotating support (14), the holding piece (40) of the holding plate (39) placed on the slide plate (33) is attached to both guide projections (37). The stepped bolt (47), which is fitted into the notch groove (38) and inserted from the through hole (46) at the front and rear ends of the holding plate (39), is formed on the guide protrusion (37), so that the screw hole ( 48), the elbow rest substrate (28) and the slide plate (33) accommodated in the elbow rest substrate (28) are guided to the rotation support (14) and the holding plate (39) with the guide slot (32a). Is mounted on the rotary support (14) so as to be movable relative to the front and rear.
After this attachment, the pad member (29) is attached to the upper surface of the elbow pad (28).

  In the armrest device (1) described above, the armrest (5) can adjust the left-right direction and the front-rear direction position as follows.

  As shown in FIG. 6, when the elbow rest (5) in the normal position facing straight forward and backward is rotated outward, that is, clockwise in plan view, the locking pin (26) causes the elastic body (24) to move. The elbow rest (5) is directed outward by approximately 30 ° by being compressed and released from the central engaging groove (27) and entering and engaging with the adjacent engaging groove (27) in the rotational direction. Stops at the position rotated.

  At this time, the stopper surface (21c) on the contact piece (21a) side of the rotation angle restricting member (20) is in contact with the stopper protrusion (22) of the support tube (10), so that the elbow rest (5 ) Is prevented from further outward rotation.

  On the other hand, when the elbow rest (5) is turned inward from the normal position, that is, in the counterclockwise direction, the locking pin (26) and the two engaging grooves (27) in the turning direction are the same as described above. By sequentially engaging, the inward rotation angle of the elbow rest (5) can be adjusted in two steps by approximately 30 °.

  At this time, the stopper surface (21c) on the contact piece (21b) side of the rotation angle restricting member (20) contacts the stopper projection (22), so that the maximum amount of inward rotation of the elbow rest (5) is achieved. Is regulated to approximately 60 °.

  In addition, as for the arm rest of the left armrest device (not shown), as described above, the right angle armrest ( It can be rotated inward and outward symmetrically by the same amount of rotation as in 5).

  FIGS. 7 and 8 show the procedure for adjusting the front / rear position of the elbow pad (5) (the pad member is not shown), and when the elbow pad (5) is located at the rear limit, FIG. As shown in FIG. 5, the front guide protrusion (37) (not shown in FIG. 7) of the rotary support (14) is in contact with the front end of the guide slot (32a) of the slide plate (33). The pair of left and right locking pins (44) elastically engage with the pair of foremost holding grooves (36), so that the elbow rest (5) is stopped and held at that position.

  When the elbow rest (5) is pushed forward from this state, the locking pin (44) compresses the elastic body (43) and disengages from the holding groove (36), so that the elbow rest (5) moves forward. When the locking pin (44) moves and elastically engages with the second holding groove (36) from the front, the elbow rest (5) moves forward by the distance of the holding groove (36) and stops. Is done.

  When the elbow rest (5) is further pushed forward, the locking pin (44) is sequentially elastically engaged with the rear retaining groove (36), and the amount of forward movement of the elbow rest (5) is determined by the retaining groove ( 36) can be adjusted step by step.

  FIG. 8 shows a state when the elbow rest (5) is moved to the front limit. In this case, the guide protrusion (37) (not shown in FIG. 8) at the rear of the rotary support (14) is shown. ) Abuts against the rear end of the guide slot (32a) of the slide plate (33), and the locking pin (44) engages with the holding groove (36) at the rearmost portion, thereby causing the elbow rest (5 ) Is held at the front limit position.

  In the above embodiment, the slide plate (33) having the frame-shaped guide (32) is accommodated inside the upper surface of the elbow rest substrate (28), and the locking pin (44) is disposed on the opposing surface of the frame-shaped guide (32). Is formed with a plurality of holding grooves (36) to selectively engage and disengage, but the slide plate (33) is omitted, and the elbow rest substrate (28) has a frame-shaped guide having a plurality of holding grooves. Can also be formed integrally.

  In the above embodiment, the rotation angle restricting member (14) is provided on the rotation support (14) side, and the stopper projection (22) that fits into the angle restricting groove (21) is provided on the support cylinder (10). However, on the contrary, a rotation angle restricting member may be provided on the outer peripheral surface of the support tube (10), and a stopper projection may be provided on the rotation support (14).

When it is not necessary to adjust the position of the elbow rest (5) in the left-right direction and only the position in the front-rear direction can be adjusted, the rotary support (14) can be fixedly provided on the elbow rest support rod (4). Good. Further, by omitting the rotary support (14), the guide projection (37), directly elbow support plate (11), or Ru mower be provided on the substrate (8).

It is a perspective view of the armrest device of the present invention. Similarly, it is a side view which cuts and shows the principal part longitudinally. Similarly, it is a disassembled perspective view of the principal part. Similarly, it is a bottom view of a rotating cylindrical body. Similarly, it is a bottom view of the left rotating cylindrical body. FIG. 3 is an enlarged cross-sectional plan view taken along line VI-VI in FIG. 2. It is a top view when an elbow rest is located in a back limit. Similarly, it is a top view when it is located in the front limit.

(1) Armrest device
(2) Bracket
(3) Armrest prop
(4) Elbow rest support rod
(5) Elbow rest
(6) Operation knob
(7) Prop cover
(8) Board
(9) Support shaft
(10) Support cylinder
(11) Elbow rest support plate
(12) Knock pin
(13) Countersunk screw
(14) Rotating support
(15) Shaft hole
(15a) Expanded step
(16) Presser plate
(17) Bolt
(18) Female thread hole
(19) Groove
(19a) Engagement groove
(20) Rotation angle regulating member
(20a) Projection
(21) Angle regulation groove
(21a) (21b) Contact piece
(21c) Stopper surface
(22) Stopper protrusion
(23) Mating hole
(24) Elastic body
(25) Communication hole
(26) Locking pin
(27) Engagement groove
(28) Elbow pad
(28a) Frame piece
(29) Pad member
(30) Engagement piece
(31) Screw
(32) Frame guide
(32a) Guide long hole
(33) Slide plate
(34) Reinforcement rib
(35) Long hole
(36) Holding groove
(37) Guide protrusion
(38) Notch groove
(39) Holding plate
(40) Holding piece
(41) (42) Mating hole
(43) Elastic body
(44) Locking pin
(45) Spacer plate
(46) Through hole
(47) Stepped bolt
(48) Female thread hole

Claims (2)

In an armrest device for a chair, in which an elbow rest composed of a pad member and an elbow rest substrate to which the pad member is fixed is mounted on an elbow rest supporting plate at the upper end of the elbow rest supporting rod so as to be movable in the front-rear direction.
A long hole facing in the front-rear direction in which both upper and lower ends open is provided at the center of the elbow pad, and a pair of front and rear guide projections erected on the elbow pad support plate are formed in the long hole in the front-rear direction. A holding plate that is fitted so as to be relatively movable and has a holding piece inserted into the lower hole at the upper end of both guide protrusions downwardly projecting downward and having a left-right dimension larger than the left-right width of the long hole. Is attached so that the back and forth movement of the elbow rest substrate is allowed, and a rectangular fitting hole extending in the vertical direction extending toward the holding piece and a center in the front and rear direction are provided at the center of the holding plate. A pair of left and right fitting holes that communicate with each other in the vertical direction so that the left and right fitting holes open on both the left and right sides of the holding piece. Each hole is urged by an elastic body made of rubber and its left and right side surfaces Accommodating the locking pin facing the vertical right pair, the elbow substrate by moving in a longitudinal direction, a portion of the outer peripheral surface of the locking pin of the right and left pair is the left and right of the slot back and forth side by side vertical retaining grooves of several provided on the opposite surface, the armrest device of the chair, characterized in that as capable of selectively elastic engagement.   The slide plate was placed on the upper surface of the elbow rest substrate, and a frame-shaped guide that protruded from the lower surface and facing in the front-rear direction was fitted into the slotted hole of the elbow rest substrate, and was surrounded by the frame-shaped guide. The armrest device for a chair according to claim 1, wherein the space is a long hole into which the guide projection of the elbow support plate is fitted, and a plurality of front and rear holding grooves are provided on one of the left and right opposing surfaces of the long hole. .

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