JP4133070B2 - Chair armrest equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an armrest device for a chair that can adjust the position of an armrest in the left-right direction.
[0002]
[Prior art]
Be able to adjust the horizontal position of the armrest of the chair to change the arm support position when operating the keyboard of an OA device such as a computer or the difference in arm depending on the physique of the seated person Is important in improving workability and fatigue.
[0003]
As described above, as a conventional armrest device that can adjust the position of the left and right directions of the elbow rest, for example, those described in Japanese Utility Model Laid-Open Nos. 3-109556 and 10-42999 are known. .
[0004]
[Problems to be solved by the invention]
In each of the conventional armrest devices described above, an elastic engagement protrusion and a plurality of engagement grooves that elastically engage and disengage are provided between the armrest body and the armrest, and the armrest is moved in the left-right direction. The left and right positions of the elbow pads are adjusted by rotating and selectively engaging the engagement protrusions with any of the engagement grooves, so that the left and right directions of the elbow pads are relatively strong. When force is applied, the engagement protrusions may be detached from the engagement grooves, and the left and right positions of the elbow rest that has been adjusted once may be easily changed.
[0005]
In order to prevent such a situation, the applicant of the present application forms a wavy surface that engages with each other on the lower surface of the elbow pad support portion and the upper surface of the operation button that protrudes from the lower surface of the elbow pad. An armrest device has been proposed in which the wavy surfaces are disengaged from each other and the left and right positions of the elbow rest can be adjusted when the arm is pushed up from below the spring (Japanese Patent Laid-Open No. 9-121975). See the official gazette).
[0006]
However, even in this armrest device, the operation button protrudes from the lower surface of the armrest, and the lower part is widely open, so once it is pushed upward by another object hitting the operation button, it is adjusted once. There was a risk that the left and right position of the elbow rest will change.
[0007]
The present invention has been made in view of the above-described problems, and allows the elbow rest to be rotated only when the operating means is operated, and prevents other objects from hitting the operating means. An object of the present invention is to provide an armrest device for a chair which is not easily pushed.
[0008]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) At the upper end of the armrest column that stands up from the side of the seat, an armrest that faces in the front-rear direction is pivotally attached to the left-right direction to form an armrest, and the armrest is placed inside the armrest. In an armrest device for a chair provided with an operating means capable of being stopped at an arbitrary rotational position around the pivot axis by engaging with a locking portion provided on the armrest, an armrest is placed on the upper rear end of the armrest column. The lower end of the support arm facing the front upper side is pivotally attached to the upper part of the front end of the armrest strut so as to be horizontally rotatable, and the upper part of the front end of the support arm is attached to the lower surface of the front end part of the armrest. Pivotally attached to the armrest so that it can be moved in the front-rear direction, an opening having a size that can be inserted by a hand , surrounded by the armrest support , the armrest , and the support arm is provided below the armrest on the armrest. In the opening, and the operation is Providing a means.
[0009]
( 2 ) In the above item (1 ) , the rear end portion of the position adjusting plate, in which a plurality of locking grooves are formed at predetermined intervals on a rotation trajectory centered on the pivot axis at the upper end portion of the pivot shaft of the elbow rest, In the space formed inside the padding, it is fixed in a non-rotatable manner, and is constantly biased downward by the biasing means above the opening in the elbow pad, and at the rear end, the plurality of locking grooves A front end portion of the operating means having a downward locking shaft that can be engaged and disengaged from above is pivoted so that it can be pushed upward through the opening.
[0010]
( 3 ) In the above item ( 2 ), a plurality of stop holes are formed in an intermediate portion between the fixing portion to the pivot and the locking groove in the position adjusting plate, and the centers thereof are the center of the locking groove and the pivot. And a protrusion that elastically engages with each stop hole is provided inside the elbow rest so as to be substantially located on a straight line connecting the two.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a chair (A) to which the present invention is applied, and a pair of left and right bases inclined slightly forward and downward (hereinafter referred to as the left in FIG. 1) at the lower end of the back frame (1). A pair of armrests (3) are attached to the outer surface of the substantially middle portion of the heel (2) so as to face each other.
[0012]
Both armrests (3) are armrest struts (hereinafter abbreviated as struts) (4) that stand slightly tilted forward from the base rod (2), and the armrest support described later that is fitted to the armrests so as to move up and down. A heel (11) and an elbow rest (5) mounted substantially horizontally on the upper end are provided. The elbow rest (5) has a height adjustment mechanism and a horizontal position adjustment mechanism, which are described later. The position in the left-right direction can be adjusted.
As shown in FIGS. 2 to 8 (hereinafter, only the left armrest will be described), the support column (4) is formed of a metal pipe having an approximately oval cross section, and the lower end portion of the support rod (2 ) Is connected to the upper end of an L-shaped pipe-shaped connecting rod (6) coupled to the outer surface of the front surface, and is secured by a screw (7) inserted therethrough.
[0013]
The outer peripheral surface excluding the lower end of the column (4) is covered with a column cover (8) having a left and right divided structure composed of an inner cover (8a) and an outer cover (8b) made of synthetic resin. The upper end of the column cover (8) is gradually widened, and the upper end on the rear side is in contact with the lower surface of the rear end of the elbow rest (5).
[0014]
A height adjusting mechanism (9) of the elbow rest (5) is accommodated in the support (4).
[0015]
As shown in FIG. 7, the height adjusting mechanism (9) has a U-shaped shape that is fitted in the support column (4) with a margin and has a horizontal elbow rest support plate (10) at the upper end. The metal elbow rest support rod (hereinafter abbreviated as support rod) (11) and a pair of inner and outer synthetic resin covering the periphery of the support rod (11) so that it can slide up and down. It consists of a height adjusting member (12) and a synthetic resin supporting member (13) fitted into the U-shaped space of the supporting rod (11).
[0016]
On the front edge of the left and right side plates (11a) of the support rod (11), outward holding pieces (14) and (14) are formed from the upper end to the vicinity of the lower end, and both the holding pieces (14) and both sides are formed. A slit-like locking groove (15) facing rearward is formed at the upper and lower portions of the front end portion of the plate (11a).
[0017]
A rectangular locking hole (16) (16) is located slightly above the upper and lower locking grooves (15) in the left and right side plates (11a), and at the center of the lower end of both side plates (11a), Downward arc-shaped guide holes (17) facing in the front-rear direction are formed respectively.
[0018]
A rectangular hole (18) facing in the front-rear direction is formed at the center of the elbow pad support plate (10), and the upper end of the support rod (11) is fitted obliquely into the rectangular hole (18). It is fixed by welding.
[0019]
The upper end portion of the rear surface of the support rod (11) is notched, and a cable (39) described later can be inserted into the inside and outside through the notch portion (19).
[0020]
A concave groove (20) facing upward and downward is formed slightly forward of the inner surface of the pair of height adjusting members (12), and the upper and lower opposing surfaces are inclined in the opposite direction toward the center. It has a mountain-shaped and valley-shaped inclined surface (20a) (20b).
[0021]
A plurality of diagonally upward locking pieces (20b) are provided at regular intervals at the rear end surface of the concave grooves (20) on the rear surface of the base piece (21a) facing vertically. An annular guide path (20c) in which a pin (38) to be described later can move is formed between the periphery of the stop member (21) having a saw-tooth shape when viewed from the side and the inner surface of the concave groove (20). As shown in FIG.
[0022]
The lower end of the base piece (21a) is an arcuate curved surface, and the lower end surface is slightly forward of the bottom surface forming the V shape at the center of the lower inclined surface (20b) of the concave groove (20). (See FIG. 11).
[0023]
In addition, a guide piece (21c) that faces obliquely rearward and upward is connected to the upper end of the base piece (21a).
[0024]
The pair of height adjusting members (12) has a pair of front and rear projections (22) projecting from the abutting surface at the upper end of the inner height adjusting member (12). 12) After fitting into a concave hole (not shown) formed in the abutting surface at the upper end of 12), it is fitted into the above-mentioned column (4) from above, and outward flanges at the upper ends of both height adjusting members (12) As shown in FIG. 2, the elastic engagement piece (23) formed on the front surface of the upper end of the inner height adjusting member (12) is secured to the upper end opening of the support (4). Is engaged with the engagement hole (24) on the front surface of the upper end of the support column (4) from the inside to prevent it from coming off upward and is fitted in the support column (4).
[0025]
When the height adjusting members (12) are fitted to the support columns (4), the ribs (25) projecting on the opposing surfaces of the rear end portions thereof and facing the vertical direction (25) come into contact with each other. As shown in FIG. 6, an insertion hole (26) through which a cable (39) described later can be inserted is formed.
[0026]
The support rod (11) has the holding piece (15) formed on the both side plates (11a) in the guide groove (27) facing the vertical direction formed at the front end of the opposing surface of both height adjusting members (12). It is inserted into both height adjusting members (12) from above so as to be slidably fitted (see FIGS. 4 to 6).
[0027]
As shown in the longitudinal sectional views of FIGS. 7 and 8, the support member (13) has an elliptical frame shape that is vertically long in side view and whose front and rear dimensions and vertical dimensions are slightly shorter than those of the support rod (11). The inner side except the lower end thereof is provided with a rib (28a) facing the vertical direction passing through the center of the front and rear, a plurality of vertical ribs (28b) facing the front and rear, the ribs (28a) (28b) and a supporting member. The rib (28c) (see FIG. 5) that connects the intermediate portion in the left-right direction with the inner surface of (13) in an orthogonal shape is integrally formed, and the whole is reinforced.
[0028]
In the space at the lower end of the support member (13), an elastic support piece (29) rising from the center of the inner surface of the lower end is provided so as to be elastically deformable in the front-rear direction around the lower end. A cylindrical support shaft portion (31) having a shaft hole (30) facing in the left-right direction is integrally formed.
[0029]
On the front surface of the support member (13), a U-shaped concave groove (32) facing forward in plan view is formed over almost the entire length in the vertical direction, and a pair of front and rear holding an arc-shaped cross section is also formed on the rear surface. The pieces (33) and (33) are projected rearward from the lower end to slightly below the upper end, and the cable (39) described later is held in both holding pieces (33). (See FIGS. 4 to 6).
[0030]
When the support member (13) is assembled to the support rod (11) and fitted into the support column (4), as shown in FIGS. An insertion hole (35) through which a cable (39) to be described later can be inserted with a margin is formed by a concave groove (34) formed in the inner surface of the front end portion in the member (12).
[0031]
The left and right side surfaces of the upper and lower ends of the support member (13) have a length that extends from the front end of the support member (13) to the vicinity of the middle portion at the same height as the ribs (28b) of the upper and lower ends. A protrusion piece (36) facing in the front-rear direction is projected, and on both left and right side surfaces of the upper support member (13) there are engaging claws (37) that can be elastically deformed toward the inner space in the rearward direction. Projected to
[0032]
When the support member (13) is fitted to the support rod (11), the protrusions (36) and the engaging claws (37) are respectively connected to the locking grooves (15) of the support rod (11). By fitting and engaging with the locking hole (16), the support member (13) is prevented from moving in the vertical direction and the front-rear direction.
[0033]
After the support member (13) is assembled to the support rod (11), the side hole (11a) of the support rod (11) is inserted into the shaft hole (30) of the support shaft portion (31) of the elastic support piece (29). The pin (38), which is a locking shaft, is fitted so that the right and left ends protrude from the side plate (11a) by a required dimension (see FIG. 6).
[0034]
The left and right projecting ends of the pin (38) are supported by the bottom surface showing the V shape of the lower inclined surface (20b) of the concave groove (20) in the inner and outer height adjusting members (12), and in this state The pin (38) faces the front end portion (base end portion) of the inclined surface on the lower surface of the lowermost locking piece (21b) (see FIGS. 5 and 11).
[0035]
As shown in FIGS. 2 to 6, the lower end is linked to the tilting operation mechanism (not shown) of the back frame (2), and the upper end is connected to the operation lever (58) described later, in the column (4). After the flexible outer tube (39a) of the cable (39) fits and holds the straight line portion extending downward from the upper end into both holding pieces (33) at the rear end of the support member (13). The upper member is folded in an upward U shape below the support member (13), and the upward straight portion is inserted into the insertion hole (35) between the front surface of the support member (13) and the height adjustment member (12). The upper side of the support member (13) and between the side plates (11a) of the support rod (11) is further folded back downward in a U-shape, and the downward straight line portion is cut out at the upper end of the support rod (11) ( Through 19), the height adjusting member (12) is inserted into the insertion hole (26) at the rear end, so that it is accommodated in a loop shape with a margin in the length in the vertical direction.
[0036]
The elbow rest (5) is formed by screwing a slightly larger synthetic resin elbow pad (41) on the upper surface of an elbow rest substrate (40) made of an aluminum alloy or the like having a rectangular shape in plan view. The mounting hole (42) that is vertically drilled in the rear end of the elbow pad (40) is fixed to the rear end of the upper elbow pad support plate (10) of the support rod (11) by welding. By fitting with the small diameter shaft (43a) of the vertical stepped support shaft (43), the rear end of the elbow rest (5) can be pivoted horizontally by the support rod (11). It is worn.
[0037]
The front end of the elbow rest (5) is supported as follows by a support arm (45) fitted in a support hole (44) at the front end of the elbow rest support plate (10) so as to be horizontally rotatable. Yes.
[0038]
As shown in FIGS. 2 and 9, the support arm (45) has a circular base portion (45a) that can be placed on the upper surface of the elbow rest support plate (10) at the lower end of the rear end, and the base portion (45a ) An arm body (45b) that extends obliquely forward and upward, and whose front end is gently bent upward, and a short shaft that projects forward from the center of its upper end and upwards on the upper surface of the front end. Auxiliary arm (45d) having a portion (45c), and a side surface projecting forward on the left and right sides of the front end of the arm body (45b) and having an upper end slidably contacting the lower surface of the front end portion of the elbow rest substrate (40) It has a pair of left and right side plates (45e) that are fan-shaped, and a pivot (46) that projects from the center of the lower surface of the base (45a) is rotated into the support hole (44) of the elbow rest support plate (10). The support arm (45) as a whole can be pivoted in the left-right direction around the support hole (44) by being fitted and pivotally attached by a screw (47).
[0039]
A pair of left and right concave support grooves (48) are formed on the opposing surface of the upper end of the base of the both side plates (45e), and the upper end of the operation lever (58) described later is formed in this support groove (48). Has come to be supported.
[0040]
A semicircular sliding piece (49) having a larger diameter than the shaft diameter projects from the front half of the upper end of the shaft portion (45c) of the auxiliary arm (45d).
[0041]
An insertion hole (50) and an insertion groove (51) of the cable (39) are formed in communication with the rear end of the base (45a) and the upper surface of the arm body (45b), respectively, and the arm body (45b) On the lower surface of the front end portion, an upward concave insertion groove (52) for inserting the screw portion (39b) of the end of the cable (39) and the end of the wire (39c) is formed.
[0042]
The upper end of the cable (39) is inserted through the insertion hole (50) and the insertion groove (51), and the screw part (39b) and the wire (39c) of the terminal are inserted through the insertion groove (52). Thus, the locking shaft portion (39d) at the upper end of the wire (39c) can be protruded forward of the arm body (45b).
[0043]
The end of the cable (39) is inserted into the upward U-shaped piece (53) protruding from the communicating portion of the both insertion grooves (51) and (52), and then the screw (39b) is tightened. In this way, it is fixed.
[0044]
As described above, the support arm (45) is pivotally fitted to the support hole (44) of the elbow rest support plate (10) with the support shaft (46) at the lower end of the rear end, and then attached to the upper end of the front end. As shown in FIG. 10, the shaft portion (45c) of the elbow pad is large enough to insert the sliding piece (49) formed in the upward bulging portion (54) of the front end portion of the elbow rest substrate (40). The dimension between the opposing surfaces, which are loosely fitted in the long holes (55) facing the front-rear direction and projecting inwardly in the middle of the rear half of the left-right opposing surfaces of the long holes (55) By engaging the lower surfaces of the left and right ends of the sliding piece (49) slidably in the front-rear direction with the upper surfaces of a pair of left and right locking steps (56) (56) that are larger than the diameter of The elbow rest (5) is attached so as to be turnable in the left-right direction while preventing upward movement.
[0045]
The upper end surface of the arm body (45b) is in contact with the lower surface of the upward bulging portion (54) and supports the front end portion of the elbow rest (5).
[0046]
After the support arm (45) is attached, the middle part in the front-rear direction immediately below the elbow rest (5) is surrounded by the arm body (45b), the support cover (8), and the elbow rest substrate (40). An opening portion (57) penetrating in the left-right direction of a size that allows insertion of a hand is formed.
[0047]
An operation lever (58) for operating the cable (39) is attached to the front end of the support arm (45) as follows.
[0048]
The control lever (58) has a flat plate shape that is slightly curved in the front and rear direction, slightly shorter than the protrusion of the support arm (45) from the front end of the armrest (5), and gently curved downward. A lever main body (58a) having a finger hanging recess (59), and an auxiliary arm (45d) and left and right side plates (45e) of the support arm (45) provided upright on both the left and right sides of the upper surface of the rear end. A pair of left and right support pieces (58b) that can be inserted between the two support pieces (58b) can be loosely fitted from above into the upper support grooves (48) of the support arms (45). A short shaft portion (58c) protrudes outward (see FIGS. 2 and 10).
[0049]
On the upper surface of the center of the rear end of the lever body (58a), a slit-like shape can be inserted with the wire (39c) at the end of the cable (39) and the locking shaft (39d) at the end in the vertical direction. An insertion groove (60) is formed on the lower surface facing the insertion groove (60), and a notch groove (61) is provided on the lower surface opposite to the front end of the insertion groove (60) to lock the locking shaft portion (39d) in the left-right direction. It is formed so as to be continuous.
[0050]
To attach the control lever (58) to the support arm (45), before attaching the elbow rest (5), first insert the locking shaft (39d) of the end of the cable (39) into the insertion groove (60). Inserted into the notch groove (61) and locked by the corners at the upper ends thereof, and the shaft portions (58c) at the upper ends of both support pieces (58b) are supported by a pair of left and right support arms (45). It fits into the groove (48) from above.
[0051]
When the elbow rest (5) is attached in this state, as shown in FIGS. 2 and 9, the lower surface of the upward bulging portion (54) of the elbow rest substrate (40) is applied to the upper end of the shaft portion (58c). Since it is prevented from coming off from the support groove (48) in contact or close, the operation lever (58) can be rotated upward about the shaft portion (58c). ) Wire (39c) is drawn.
[0052]
Further, the operating lever (58) is always urged downward by the tension acting on the wire (39c) of the cable (39).
[0053]
The downward rotation of the operation lever (58) is prevented by the rear end surface of the operation lever (58) coming into contact with the front end surface of the arm body (45b).
[0054]
The upper end portions of both support pieces (58b) of the operation lever (58) are pivotally attached to the auxiliary arm (45d) of the support arm (45) so as to be rotatable by a pin or the like facing left and right. The support groove (48) at the upper end of (45) and the shaft portion (58c) of the support piece (58b) may be omitted.
[0055]
As shown in FIGS. 2 and 10, the horizontal position adjusting mechanism (62) is placed on the upper surface of the rear end portion of the elbow rest substrate (40), and the stepped support shaft (43) of the support rod (11). The upper end of the position adjustment plate (64) fixed so as not to be horizontally rotatable by a screw (63), and an elliptical guide hole (65) formed in the elbow pad (40) in front of the position adjustment plate (64) from above. An operation button (66) that is loosely fitted and engages / disengages from the position adjustment plate (64) to prevent or allow the elbow rest (5) to rotate, and a leaf spring that constantly urges the button downward. (67).
[0056]
An arc-shaped long hole (68) centered on the screw (63) is formed at the rear end of the position adjusting plate (64). The long hole (68) has a rear end of the elbow pad (40). A stopper pin (69) standing at the center of the end is loosely fitted, and the elbow rest (5) is horizontally rotated in the left-right direction until the pin (69) contacts the left and right ends of the long hole (68). Can do.
[0057]
A bottomed hole (70) is formed in front of the mounting hole (42) in the elbow pad (40), and the bottomed hole (70) is pressed upward by a compression coil spring (71). A ball (hard ball) 72 is accommodated.
[0058]
A plurality of (four) stop holes (73) are drilled on a rotation locus centering on the stepped support shaft (43) in the middle part of the position adjustment plate (64) in the front-rear direction. The ball (72) is selectively locked to the lower end. The bottomed hole (70), the compression coil spring (71), the ball (72), the stop hole (73) and the like may be omitted.
[0059]
An arc-shaped long hole (74) centering on the stepped support shaft (43) is formed at the front end of the position adjustment plate (64), and the inner surface of the opening on the front side faces forward. A plurality of (4) semicircular arc-shaped locking grooves (75) are recessed, and a line connecting their centers with the centers of the stop holes (73) and the stepped support shaft (43) is almost It is formed so as to be aligned.
[0060]
At the front and rear edges of the operation button (66), support pieces (66a) and (66b) that abut on the upper surface of the elbow pad (40) are projected in the front-rear direction, and the front support piece (66a) A pair of shaft portions (76) protrudes from the left and right side portions of the front end.
[0061]
The two shaft portions (76) are rotatably inserted between a pair of left and right holding pieces (77) projecting on the upper surface of the center portion of the elbow pad (40), and the front end portion of the support piece (66a). When the lower end of the presser piece (78) protruding from the lower surface of the elbow pad (41) is in sliding contact with or close to the upper surface, the operation button (66) has a guide hole (65 ) Can be rotated up and down. Instead of holding the shaft portion (76) by a pair of holding pieces (77), a pair of bearing portions having an upward U-shape projecting from the upper surface of the elbow pad (40). The shaft portion (76) may be fitted in a rotatable manner.
[0062]
The leaf spring (67) has a square cross section, the lower piece is accommodated in a rectangular bottomed hole (79) formed on the upper surface of the operation button (66), and the upper end of the upper piece is In addition, it is in pressure contact with the lower surface of the elbow pad (41).
[0063]
At the center of the lower surface of the rear end of the rear support piece (66b), a locking shaft (80) protrudes downward, and the locking shaft (80) is formed in the plurality of locking grooves (75). , And can be selectively engaged from above.
[0064]
The lower end of the operation button (66) slightly protrudes into the opening (57) between the elbow rest (5) and the support arm (45), and inserts a hand into the opening (57) and turns upward. It can move.
[0065]
At the center of the lower surface of the operation button (66), there is formed a recess (66c) that is recessed upward for finger hanging.
[0066]
In the armrest device of the above embodiment, the height adjustment of the elbow rest (5) can be performed as follows.
[0067]
As shown schematically in FIG. 11, when the height of the elbow rest (5) is at the lower limit position, the left and right ends of the pin (38) inserted through the upper end of the elastic support piece (29) of the support member (13) are , Which is supported by the V-shaped bottom surface of the inclined surface (20b) at the lower end of the concave groove (20) formed on the opposing surfaces of the left and right height adjusting members (12) and prevented from further descending. ing.
[0068]
When the entire armrest (3) is pulled up from this state, both ends of the pin (38) move obliquely rearward and upward along the lower surface of the first stage locking piece (21b) of the stop member (21). Thus, the elastic support piece (29) is elastically deformed rearward, and at the same time the pin (38) gets over the tip of the locking piece (21b), the elastic support piece (29) is restored to the original vertical line as indicated by a two-dot chain line. Restores elasticity to position.
[0069]
As a result, both ends of the pin (38) are elastically engaged with and supported by the base of the upper surface of the first stage locking piece (21b), and the height of the elbow rest (5) is concave. The height between the lower end of the groove (20) is increased by the dimension between the bases of the first-stage locking pieces (21b) and is held in that position.
[0070]
When the entire armrest (3) is further lifted from this position, the pin (38) is sequentially engaged and supported by the upper locking piece (21b) by the same action as described above, and the locking piece (21b) The height of the elbow rest (5) can be adjusted step by step by the number. FIG. 3 shows an example in which the elbow rest (5) is adjusted to the maximum height.
[0071]
At this time, the cable (39) housed in the column (4) is also pulled, but the cable (39) is looped in the column (4) and is inserted into the insertion holes (26) and (35). Since it is supported so as to be slidable, the increase in height is absorbed by the shortening of the loop length, and there is no possibility of hindering the rise of the elbow rest (5).
[0072]
When the armrest (3) is pulled up to the upper limit position, the pin (38) moves over the tip of the guide piece (21c) and moves forward. When the armrest (3) is pushed down in this state, The elastic support piece (29) is elastically deformed forward in the opposite direction, and the pin (38) is a guide path between the base piece (21a) of the stop member (21) and the front surface of the concave groove (20) ( By moving downward through 20c) and moving to the lower end of the groove (20), the elbow rest (5) is lowered to the lower limit position at a time.
[0073]
At this time, the guide between the base piece (21a) and the front surface of the groove (20) is used to prevent the elbow rest (5) from descending suddenly and to mitigate the impact when stopped at the lower limit position. The clearance of the path (20c) may be a dimension that allows the pin (38) to slide with an appropriate frictional force.
[0074]
Thus, when the height adjusting mechanism (9) of the above embodiment is used, the elbow rest (3) can be simply moved up and down without any special operation means. The height of 5) can be adjusted stepwise.
[0075]
In addition, the operation lever (58) of the cable (39) is attached to the support arm (45) and moves up and down together with it, so that the operability is significantly higher than that provided at the lower part of the seat. improves.
[0076]
When adjusting the position of the elbow rest (5) in the left-right direction, the operation button (66) is first pushed up against the leaf spring (67), and the locking shaft (80) at the rear end is moved up to the position adjustment plate (64 ) Is removed above the locking groove (75).
[0077]
Next, with the operation button (66) kept pressed, the elbow rest (5) is rotated in the left-right direction until the ball (72) engages one of the stop holes (73).
[0078]
Next, when the operation button (66) is released, the locking shaft (80) automatically engages with one of the locking grooves (75) linearly aligned with the stopped stop hole (73). The position of the elbow rest (5) in the left-right direction can be adjusted step by step according to the physique of the seated person and the work content.
[0079]
At this time, since the ball (72) is elastically engaged with the stop hole (73), the elbow rest (5) can be rotated stepwise with a sense of moderation.
[0080]
An opening (57) through which a hand can be inserted passes through the middle part in the front-rear direction directly below the elbow rest (5), and the operation button (66) is provided above the opening (57). Therefore, just by inserting a hand from the outside of the opening (57), the position of the operation button (66) can be easily confirmed in the sitting position, and the thumb attached to the upper surface of the elbow rest (5) And the other 4 fingers inserted from the opening (57), the elbow rest (5) can be gripped and rotated, or the operation button (66) can be pushed. , Operability is improved.
[0081]
The front end of the elbow rest (5) is supported by a support arm (45) provided on the support rod (11) and extending forward and upward, and is supported by both ends with the rear end. High strength against pressing load.
[0082]
Further, the support arm (45) rotates together with the elbow rest (5), and the support point at the front end of the support arm (45) hardly changes. Load strength is obtained.
[0083]
Further, the operation lever (58) also rotates together with the elbow rest (5) and the support arm (45), and is always oriented in the same direction immediately below the front end of the elbow rest (5). 5) With the palm of the hand at the front end, it can be easily turned upward with a finger.
[0084]
Since the lever body (58a) of the operation lever (58) and the arm body (45b) of the support arm (45) are substantially continuous toward the front upper side, the cable (39) connected to the operation lever (58) There is no need to bend the wire at a steep angle, and the push-pull of the wire therein is performed smoothly.
[0085]
【The invention's effect】
According to the first aspect of the present invention, since the left and right positions of the elbow rest can be adjusted only when the operating means is operated, the armrest rotates in a delusion and the position of the elbow rest that has been adjusted once changes. Can be prevented.
[0086]
In addition, since the operating means is provided in the opening of a size that can be inserted by the hand, it does not hit another object and is easily pushed.
Furthermore, since the opening is provided inside the armrest strut, the armrest, and the support arm, the thickness of the armrest can be partially increased, or the front and rear dimensions of the upper end of the armrest strut can be increased. For example, it is not necessary to form an opening in the portion, and the appearance of the armrest and the armrest post is improved.
Even if the elbow rest is rotated in either the left or right direction, the support arm also rotates to support the front end of the elbow rest, so that the support strength (load bearing strength) of the elbow rest increases and the elbow rest Unbalanced load does not act on the pivot axis.
[0087]
According to the second aspect of the present invention, it is possible to grasp the elbow rest, insert a hand into the opening, and push the operating means up and down, so that the locking shaft can lock the position adjusting plate. The elbow rest can be released from the groove and the elbow rest can be rotated in the left-right direction. Can be stopped.
[0088]
Further, the operation of the operating means and the turning operation of the elbow rest can be performed simultaneously with one hand.
[0089]
According to the invention described in claim 3 , when the elbow rest is rotated, the protrusion elastically engages with the stop hole, so that the elbow rest can be rotated stepwise with a sense of moderation and the stop hole When the protrusion is engaged, if the hand is released from the operating means, the locking shaft automatically engages with any of the locking grooves, so that the position adjustment of the elbow rest becomes easy.
[0090]
[Brief description of the drawings]
FIG. 1 is a side view of a chair to which the present invention is applied.
FIG. 2 is a central longitudinal side view of the armrest device of the present invention.
FIG. 3 is also a central longitudinal side view when the elbow rest is raised to the upper limit position.
4 is an enlarged cross-sectional plan view taken along the line IV-IV in FIG. 1. FIG.
5 is an enlarged cross-sectional plan view taken along line VV in FIG.
6 is an enlarged cross-sectional plan view taken along line VI-VI in FIG.
FIG. 7 is an exploded perspective view of a height adjustment mechanism.
8 is an enlarged vertical rear view of line VIII-VIII in FIG. 7;
FIG. 9 is a plan view of a support arm.
FIG. 10 is an enlarged plan view showing the elbow pad with the elbow pad removed.
FIG. 11 is a side view of the height adjusting member for explaining the operation of the height adjusting mechanism.
[Explanation of symbols]
(1) Back frame
(2) Base kite
(3) Armrest
(4) Armrest prop
(5) Elbow rest
(6) Connection
(7) Screw
(8) Prop cover
(8a) Inner cover
(8b) Outer cover
(9) Height adjustment mechanism
(10) Elbow rest support plate
(11) Elbow rest support rod
(11a) Side plate
(12) Height adjustment member
(12a) Outward saddle
(13) Support member
(14) Holding piece
(15) Locking groove
(16) Locking hole
(17) Guide hole
(18) Rectangular hole
(19) Notch
(20) Groove
(20a) (20b) inclined surface
(20c) Guideway
(21) Stop member
(21a) Base piece
(21b) Locking piece
(21c) Guide piece
(22) Protrusion
(23) Elastic engagement piece
(24) Engagement hole
(25) Rib
(26) Insertion hole
(27) Guide groove
(28a) (28b) (28c) Rib
(29) Elastic support piece
(30) Shaft hole
(31) Support shaft
(32) Concave groove
(33) Holding piece
(34) Concave groove
(35) Insertion hole
(36) Projection strip
(37) Engagement claw
(38) Pin
(39) Cable
(39a) Outer tube
(39b) Wire
(40) Elbow pad
(41) Elbow pad
(42) Mounting hole
(43) Stepped support shaft
(43a) Small diameter shaft
(44) Support hole
(45) Support arm
(45a) Base
(45b) Arm body
(45c) Shaft
(45d) Auxiliary arm
(45e) Side plate
(46) Spindle
(47) Screw
(48) Support groove
(49) Sliding piece
(50) Insertion hole
(51) (52) Insertion groove
(53) U-shaped piece
(54) Upward bulge
(55) Long hole
(56) Locking step
(57) Opening
(58) Control lever
(58a) Lever body
(58b) Support piece
(58c) Shaft
(59) Recess
(60) Insertion groove
(61) Notch groove
(62) Horizontal position adjustment mechanism
(63) Screw
(64) Position adjustment plate
(65) Guide hole
(66) Operation buttons (operation means)
(66a) (66b) Support piece
(66c) Recess
(67) Leaf spring (biasing means)
(68) Long hole
(69) Pin
(70) Bottomed hole
(71) Compression coil spring
(72) Ball (projection)
(73) Stop hole
(74) Long hole
(75) Locking groove
(76) Shaft
(77) Holding piece
(78) Presser piece
(79) Bottomed hole
(80) Locking shaft
(A) Chair

Claims (3)

An armrest that faces in the front-rear direction is pivotally attached to the upper end of the armrest column that stands up from the side of the seat body so as to be pivotable in the left-right direction to form an armrest, and the armrest is provided in the armrest. In the armrest device of the chair provided with operation means that can be stopped at an arbitrary rotation position around the pivot axis by engaging with the locking portion,
The rear end of the armrest is pivotally attached to the upper rear end of the armrest strut, and the lower end of the support arm facing the front upper side is pivotally attached to the upper front end of the armrest strut so as to be horizontally rotatable. The upper end of the front end is pivotally attached to the lower surface of the front end of the armrest so that it can move in the front-rear direction, so that the hand is inserted under the armrest in the armrest and surrounded by the armrest strut , armrest and support arm. An armrest device for a chair, characterized in that an opening of a possible size is provided so as to penetrate in the left-right direction, and the operation means is provided in the opening. At the upper end of the pivot of the elbow rest, the rear end of the position adjusting plate, in which a plurality of locking grooves are formed at predetermined intervals on a rotation trajectory centered on the pivot, is rotated in the space formed inside the elbow rest. Downward locking that is fixed immovably and is always downwardly biased by the biasing means above the opening in the elbow rest, and is capable of being engaged and disengaged from above with the plurality of locking grooves. the front end portion of the operation means comprising a shaft, armrest apparatus of claim 1 Symbol placement of chairs and pivotally as can be upwardly pushed through the opening. A plurality of stop holes are provided in the middle portion between the fixing portion to the pivot and the locking groove in the position adjusting plate so that their centers are substantially located on a straight line connecting the locking groove and the center of the pivot. The armrest device for a chair according to claim 2 , wherein the armrest device is provided on a rotation trajectory centering on the pivot axis, and a protrusion that elastically engages with each stop hole is provided inside the armrest.

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