JP4936270B2 - Chair - Google Patents

Description

  The present invention relates to a chair provided with an armrest.

Many chairs used in offices are equipped with armrests, but some of them are capable of adjusting the height of the armrests on which the seated person's elbows are placed. Yes. For example, in the following patent document, an armrest is composed of a fixed column rigidly connected to a chair body and a movable column that can slide along the fixed column, and an elbow rest is attached to the upper end of the movable column. Certain embodiments of the chair are disclosed. In this armrest of the chair, a plurality of engaging portions (engagement holes) are intermittently formed in the vertical direction on the fixed column side, while a lever body that can be rotated is mounted on the movable column side, The relative position of the movable strut with respect to the fixed strut can be fixed by selectively engaging the claw of the body with any of the engaging portions.
JP 2005-177054 A

  However, in the armrest as in the above example, it is necessary to make a fixed support column separately for the left side and the right side of the chair. The fixed struts are often metal castings such as aluminum die casting, and the fact that the fixed struts are separate on the left side and the right side is a problem that leads to an increase in the number of dies and consequently to a cost increase.

  An object of the present invention made in view of the above is to make the fixed support common between the armrest disposed on the left side of the chair and the armrest disposed on the right side.

In the present invention, a fixed column extending in a predetermined axial direction and intermittently forming a plurality of engaging portions in the axial direction, and a movable column supported by the fixed column so as to be slidable along the fixed column. An engagement element that selectively engages any one of the engagement portions to fix the relative position of the movable strut to the fixed strut, and an elbow rest provided at the upper end of the movable strut. In the armrest of the chair, the fixed column including the engaging portion is formed in a side view shape symmetrical to the axis. If it is such, the whole fixed support | pillar including an engaging part can be made common between the armrest arrange | positioned on the left side of a chair, and the armrest arrange | positioned on the right side.

  Specifically, the engaging portion is formed on the inner surface side of the fixed support so as to form a pair in the front-rear direction across the axis. As a result, the outer side of the fixed support can be made smooth, which is effective in maintaining the beauty and style of furniture.

  Furthermore, it is desirable to provide a connecting portion used for connecting to the chair body at the lower end portion of the fixed column, and to form the fixed column including the connecting portion in a side view shape symmetrical to the axis. .

Any one of a fixed column extending in a predetermined axial direction and intermittently forming a plurality of engaging portions in the axial direction, a movable column supported so as to be slidable along the fixed column, and the engaging unit In an armrest of a chair comprising an engagement element that selectively engages and fixes the relative position of the movable column to the fixed column, and an armrest provided on the upper end of the movable column, By forming the fixed strut in a side view shape symmetrical to the axis including the engaging portion, the fixed strut is common between the one disposed on the left side and the one disposed on the right side of the chair. The cover is provided with a recessed portion that opens upward and laterally on the fixed support column, the engagement portion is formed on the inner periphery of the recessed portion, and a cover that shields the recessed portion from the side. If fitted, it will be recessed when adjusting the height position of the movable strut and elbow rest. Can be avoided is exposed inadvertently. In addition, a scale, a number, a symbol, or the like indicating a guide for the height position of the movable support or the elbow rest can be attached to the cover surface. In that case, it is preferable that the cover is a resin molded product with respect to the fixed support column of the metal cast product.

  Preferably, the movable support column is provided with a rotatable lever body having a claw that engages with the engaging portion, and an operation body that receives the operation by a seated person and drives the lever body, and the lever Let the body function as the engagement element.

  According to this invention, a fixed support | pillar can be made common between the armrest arrange | positioned on the left side of a chair, and the armrest arrange | positioned on the right side.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, the chair according to this embodiment includes a leg 4, a base 2 supported by the leg 4, a seat 3 disposed on the base 2, and a horizontal support shaft 16. The armrest A is attached to a chair body C having a backrest 1 pivotally attached to the base body 2, and a synchro-rocking operation in which the seat 3 and the backrest 1 tilt in conjunction with each other is possible.

  More specifically, the leg 4 includes a leg blade 41 on which a plurality of casters are mounted, and a leg column 42 that rises substantially vertically from the center of the leg blade 41. The leg blade 41, the leg column 42, The leg struts 42 can be projected and retracted vertically by extending and contracting a gas spring (not shown) interposed therebetween.

  The base body 2 is fixed to the upper end of the leg column 42, and the height positions of the seat 3 and the backrest 1 can be adjusted through the operation of projecting and retracting the leg column 42. An elastic biasing mechanism (not shown) for biasing the backrest 1 rotating around the horizontal support shaft 16 forward, a fixing mechanism (not shown) for fixing the locking angle of the backrest 1, etc. Built in. The elastic urging mechanism elastically urges the back frame 11 by mounting a coil spring or a gas spring.

  The seat 3 is formed by mounting a cushion body 32 that forms a seating surface on a seat receiver 31. The front end portion of the seat 3 is supported so as to be slidable in the front-rear direction with respect to the base body 2, and the rear end portion of the seat 3 is connected to the lower frame portion 13 of the back frame 11 described below via a hinge (not shown). Are attached.

  The backrest 1 is obtained by stretching a tension member 12 that forms a backrest surface S on the front surface of the back frame 11. The back frame 11 includes a lower frame portion 13 connected to the base body 2 so as to be rotatable about a horizontal support shaft 16, and an upper frame portion 14 connected to the upper end of the lower frame portion 13 via a hinge 17. And a reaction force frame portion 15 for supporting the upper frame portion 14 from the rear.

  The lower frame portion 13 is formed by connecting left and right lower frame elements 131 a and 131 b that are spaced apart in the width direction to each other by a rigid horizontal member 132. Both the lower frame elements 131a and 131b and the rigid horizontal member 132 are, for example, metal rigid bodies. The lower frame elements 131a and 131b have a substantially L-shape that extends rearward from the front end where the horizontal support shaft 16 is located in side view and is bent upward at the rear end.

  The upper frame portion 14 is formed by connecting left and right upper frame elements 141 a and 141 b that are spaced apart in the width direction to each other by an elastic horizontal member 142. The upper frame elements 141a and 141b are, for example, metal rigid bodies, while the elastic horizontal member 142 is, for example, an elastic body made of resin. The upper frame elements 141a and 141b have an arcuate shape that extends upward from the lower end where the side view hinge 17 is located while gently curving so as to be somewhat recessed backward, and bulges forward again in the vicinity of the upper end.

  The reaction force frame portion 15 includes the same number of reaction force frame elements 151a and 151b that support the upper frame elements 141a and 141b. One end portions of the reaction force frame elements 151a and 151b are connected to the back surfaces of the upper frame elements 141a and 141b, and the other end portions are connected to the downward surfaces of the lower frame elements 131a and 131b. The reaction force frame elements 151a and 151b are made of an elastic body made of a resin having the same quality as the elastic horizontal member 142, for example. The reaction force frame elements 151a and 151b extend substantially along the frame elements 131a and 131b and the upper frame elements 141a and 141b in a side view, and have a substantially L shape.

  The periphery of the hinge 17 that pivotally attaches the lower frame elements 131a and 131b and the upper frame elements 141a and 141b to each other, specifically, from the rear end to the vicinity of the upper end of the lower frame elements 131a and 131b and the lower ends of the upper frame elements 141a and 141b. In the vicinity range, a curved shape is formed such that the front surface of the side view frame bulges forward. As already described, also in the vicinity of the upper ends of the upper frame elements 141a and 141b, a curved shape is formed such that the front surface of the side view frame bulges forward. Accordingly, the tension member 12 is stretched so as to be bridged over the curved portions of the lower frame elements 131a and 131b and the upper frame elements 141a and 141b.

  The tension member 12 is mainly composed of a tension fabric 121 that is rich in elasticity. The upholstery 121 is made of, for example, a double raschel mesh made of synthetic fiber and further knitted with elastic yarn such as an elastomer yarn (specifically, a surface fabric and a back fabric of a mesh fabric that can be expanded and contracted are three-dimensional by double raschel knitting. ) And has both strength and cushioning properties.

  The upper side and the left and right sides of the upholstery 121 are retained by the backup material 122. As shown in FIG. 10, in the backup material 122, the vertical frames 122a and 122b and the horizontal frame 122c connecting both the vertical frames 122a and 122b form a three-sided frame shape or a four-sided frame shape when viewed from the front, A thin plate body made of, for example, resin that can be bent and deformed in the front-rear direction, in particular, the left and right sides of the stretch fabric 121 are prevented from bending inward, and the stretch fabric 121 is kept stretched. The backup material 122 in the illustrated example has a substantially three-sided frame shape in front view in which the upper ends of the left and right vertical frames 122a and 122b are connected to each other via a horizontal frame 122c.

  The upper end portion of the backup material 122 is supported on the upper end portion of the back frame 11. In the present embodiment, through holes 122x are made in the upper ends of the vertical frames 122a and 122b of the backup material 122, and fastening devices 191 such as screws or pins are inserted into the through holes 122x, and the upper ends of the upper frame elements 141a and 141b. It is fixed to the part. On the other hand, the lower end portion of the backup material 122 is supported by the lower end portion of the back frame 11. In the present embodiment, long holes 122y extending in the vertical direction are formed in the lower ends of the vertical frames 122a and 122b of the backup material 122 and portions slightly below the middle, and fasteners such as screws or pins are provided in the long holes 122y. 192 is inserted and fixed to the lower end and the upper end of the lower frame elements 131a and 131b. The upper end portion of the backup material 122 is fixed to the upper frame elements 141a and 141b, but the lower end portion can slide up and down with respect to the lower frame elements 131a and 131b.

  Between the upper end portion of the back frame 11 and the vicinity of the hinge 17 is curved so as to be recessed rearward in a side view, and an intermediate portion of the vertical frames 122a and 122b is provided with a room where it can bend and deform backward. The elastic horizontal member 142 forming the upper side of the back frame 11 is also curved so as to be recessed rearward in plan view, and provides a room for the horizontal frame 122c to bend and deform backward.

  The upper end portion of the tension member 12 is mounted and supported on the left and right upper frame elements 141a and 141b, and the lower end portion is mounted and supported on the left and right lower frame elements 131a and 131b. When installing the tension fabric 121 on the back frame 11, the upper edge of the tension fabric 121 is attached to the horizontal frame 122 c of the backup material 122, and the left and right side edges of the tension fabric 121 are attached to the vertical frames 122 a and 122 b of the backup material 122. . Specifically, as shown in FIG. 10, the groove 122z is formed in the circumferential end surface of the backup material 122, that is, the upper end surface of the horizontal frame 122c and the outer end surfaces of the left and right vertical frames 122a and 122b, respectively. The three edges of the upholstery 121 are fitted and locked. For example, a resin-made edge material having a long thin plate shape is attached to the three edge portions 121x of the upholstery 121 in advance (by sewing, adhesion, welding, or the like). Further, the lower edge of the tension fabric 121 is fixed to a predetermined portion of the lower frame portion 13. In the illustrated example, a bracket 121 y is attached to the lower edge of the tension fabric 121, and the bracket 121 y is fixed to the rigid horizontal member 132 of the lower frame portion 13 using a bolt 193 or the like.

  Generally speaking, a backup material 122 is disposed on the front surface of the back frame 11, and a tension fabric 121 is disposed on the front surface of the backup material 122. At this time, the backup material 122 acts as a leaf spring, and pushes the stretched fabric 121 forward to project it. The upper end portion and the lower end portion of the upholstery 121 are respectively fixed to the upper and lower end portions of the back frame 11. The upper end portion of the tension fabric 121 is indirectly fixed to the upper frame elements 141a and 141b via the backup material 122, and the lower end portion of the tension fabric 121 is directly fixed to the lower frame elements 131a and 131b without the backup material 122. Has been.

  The chair of the present embodiment can perform a synchro-rocking operation in which the seat 3 and the backrest 1 are tilted in conjunction with each other. As shown in FIG. 6, in the synchro-rocking operation, the backrest 1 tilts back and forth as the entire back frame 11 rotates around the horizontal support shaft 16. At the same time, the rear end of the seat 3 swings up and down in conjunction with the back frame 11, and the front end of the seat 3 slides back and forth.

  In addition, the chair of the present embodiment follows only the left half of the upper part of the backrest surface S by following the movement of turning back, stretching the hand, or twisting the body while the seated person is seated, or the right Only the half part can be displaced backward. In the upper frame portion 14 that supports the upper portion of the backrest surface S, the upper frame elements 141a and 141b that make a pair on the left and right sides move back and forth independently of each other. That is, the left upper frame element 141a is connected to the left lower frame element 131a via the hinge 17, and the right upper frame element 141b is connected to the right lower frame element 131b via the hinge 17, The frame elements 141a and 141b can be individually rotated.

  As shown in FIG. 7, when the upper frame elements 141a and 141b are tilted rearward around the hinge 17, the tension member 12 comes into contact with the curved portions of the lower frame elements 131a and 131b and the upper frame elements 141a and 141b. As the area gradually increases, the separation distance between the upper end portion and the lower end portion of the back frame 11 increases, so that the tension fabric 121 extends vertically while increasing the tension. At the same time, the lower end portion of the backup material 122 is relatively displaced in the vertical direction with respect to the lower frame elements 131a and 131b within the dimension range of the long hole 122y. At the same time, the reaction force frame elements 151a and 151b are deformed so as to widen the angle to accumulate the reaction force, and elastically bias the front frame elements 141a and 141b back to the original positions, that is, forward.

  If one of the upper frame elements 141a (141b) is displaced in the front-rear direction relative to the other upper frame element 141b (141a), as shown in FIGS. The shape of can be changed three-dimensionally. In this operation, the lower frame portion 13 is not necessarily driven. Since the lower frame elements 131a and 131b that make a pair on the left and right are rigidly connected via the rigid horizontal member 132, the lower frame elements 131a and 131b always move integrally. Therefore, the lower part of the backrest surface S and the part below the seated person's lower back always maintain a constant shape.

  When one of the upper frame elements 141a and 141b moves back and forth relative to the other as the seated person moves, the distance between the left and right upper frame elements 141a and 141b increases. At that time, the elastic horizontal member 142 is elastically deformed to cope with an increase in the separation distance between the upper frame elements 141a and 141b. The elastic horizontal member 142 of the present embodiment connects the upper end portions of the upper frame elements 141a and 141b to each other and is assembled in a curved shape that is recessed backward in plan view. The front and rear thicknesses of the elastic horizontal member 142 are gradually reduced from the both ends connected to the upper frame elements 141a and 141b toward the center in the width direction, and the middle portion is relatively smaller than the both ends. It is easy to deform. This is for avoiding the concentration of the load at the connection point between the upper frame elements 141a and 141b and the elastic horizontal member 142. When one of the upper frame elements 141a and 141b moves back and forth relatively with respect to the other, the elastic horizontal member 142 is deformed so as to reduce the curvature and extends the distance between both ends.

  In addition, the load of the seated person received by the backrest surface S acts on the upper frame elements 141a and 141b via the tension member 12, and tries to cause the upper frame elements 141a and 141b to fall inwardly on the hinge 17. Burdening. For the purpose of canceling and reducing such a load, the elastic horizontal member 142 is assembled in a state of exerting an initial elastic force that separates the upper frame elements 141a and 141b in the width direction.

  However, the upper frame elements 141a and 141b on both the left and right sides can be tilted together. In that case, for example, stretching that greatly warps the back of the seated person is possible.

  Incidentally, the lumbar support member 18 can be bridged at a height position corresponding to the back of the upholstery 121 and the waist of the seated person. Even when the seated person leans over the backrest surface S, the region near the waist is supported from behind by the lumbar support member 18 and does not sink back beyond a depth corresponding to the total length of the lumbar support member 18. . Both ends of the lumbar support member 18 are attached to and supported by the left and right vertical frames 122a and 122b of the backup material 122 via an appropriate support structure (not shown). However, it does not prevent the end portions of the lumbar support member 18 from being supported by the left and right upper frame elements 141a and 141b or the lower frame elements 131a and 131b.

  Hereinafter, the armrests A disposed on the left and right sides of the chair will be described with reference to FIGS. The armrest A is formed by supporting an elbow rest 6 on which the seated person's elbow can be placed from below with an armrest 5. The armrest 5 includes, as elements, a fixed column 51 that extends upward or frontward and a movable column 52 that is supported so as to be slidable along the fixed column 51. The fixed column 51 is a metal casting such as aluminum die casting, for example. The lower end portion of the fixed column 51 is bent or curved inward and serves as a connecting portion for connecting to the chair body C. In the present embodiment, this connecting portion is joined to the back frame 11 in the chair body C, more specifically, to the outer surface of the lower frame portion 13.

  The connection structure between the fixed column 51 and the lower frame part 13 will be described in detail. The connecting portion of the fixed column 51 is previously provided with a recess 511 that forms a non-circular edge when viewed from the side and opens inward. As shown in FIG. 15 and the like, the concave portion 511 has a flat shape extending in the front-rear direction, in which the side view width dimension (front-rear width dimension) is different from the height dimension. The upper edge portion at the periphery of the recess 511 is generally linear, while the lower edge portion is a relatively large curved elliptical arc, and they are not parallel to each other. In addition, a first inner tapered surface 511x that inclines from the upper edge portion of the periphery toward the inner depth of the recess 511, and a second inner tapered surface 511y that inclines from the lower edge portion toward the inner depth of the recess 511. And form. In the illustrated example, the first inner tapered surface 511x and the second inner tapered surface 511y are continuous to form a tapered surface that extends over substantially the entire inner circumference of the recess 511. In addition, a bolt insertion hole 512 that penetrates the inner wall of the recess 511 and communicates with the recess 511 from the outer side toward the inner side is formed in the connecting portion.

  In turn, the outer surface of the lower frame elements 131a and 131b is previously provided with a convex portion 133 protruding outward. The convex portion 133 is a part that fits into the concave portion 511 on the fixed support column 51 side, and as shown in FIG. 14, in the vicinity of the concave hole 135 for attaching the other end portions of the reaction force frame elements 151a and 151b. positioned. The convex portion 133 also has a flat shape in which the side view width dimension and the height dimension are different. The upper edge portion of the convex portion 133 is generally linear, while the lower edge portion is a relatively large curved elliptical arc shape, and they are not parallel to each other. In addition, a first outer tapered surface 133x is formed on the upper edge portion of the convex portion 133 so as to closely engage the first inner tapered surface 511x, and the second inner tapered surface is formed on the lower edge portion. A second outer taper surface 133y is formed that closely engages 511y. In the illustrated example, the first outer tapered surface 133x and the second outer tapered surface 133y are continuous, and form a tapered surface that extends over substantially the entire outer periphery of the convex portion 133. In addition, the convex portion 133 has a female screw hole 134 that penetrates from the outer side toward the inner side.

  When connecting the fixed support column 51 and the lower frame part 13, the connection part of the fixed support column 51 is brought close to the outer surface of the lower frame part 13, and the convex part 133 is fitted into the concave part 511. Then, the bolt insertion hole 512 and the female screw hole 134 overlap on the concentric shaft as viewed from the side. Thereafter, as shown in FIGS. 12, 13 and the like, one bolt 7 is inserted into the bolt insertion hole 512 from the outside, and the male screw of the bolt 7 is screwed into the female screw hole 134 and tightened. As a result, the first inner taper surface 511x and the second inner taper surface 511y are closely engaged with the first outer taper surface 133x and the second outer taper surface 133y, respectively. The fixed support column 51 and the lower frame part 13 can be fastened while being positioned at the mounting position.

  In addition, a recessed portion 513 that opens upward and inward is provided on the inner surface side of the fixed column 51. Then, a plurality of protrusions 514 having a substantially square shape or a substantially trapezoidal shape in a side view protruding in a direction close to each other from the front and rear walls of the recessed portion 513 are intermittently formed along the extending direction of the fixed column 51. These protrusions 514 or the recesses 515 between the protrusions 514 are used as engaging portions to fix the relative position of the movable support column 52 to the fixed support column 51. In the present embodiment, the fixed support column 51 is shared between the armrest A disposed on the left side of the chair and the armrest A disposed on the right side. For this purpose, the fixed support column 51 is formed in a side view shape symmetrical to the axis L along the extending direction. The symmetry of the side view axis L is no exception for the recessed portion 513, the protrusion 514, the recessed notch 515, the recessed portion 511, the inner tapered surfaces 511x and 511y, and the bolt insertion hole 512.

  The movable support column 52 is a cylindrical body of, for example, a resin molded product that extends upward or forward and upward. The movable support column 52 is supported by the fixed support column 51 so as to cover the fixed support column 51 from above, and the movable support column 52 can be slid along the fixed support column 51 while sliding the inner peripheral surface thereof on the outer peripheral surface of the fixed support column 51. The elbow rest 6 is attached to the upper end portion of the movable column 52. Inside the movable column 52, an engagement member that is formed on the fixed column 51, that is, an engagement element that engages with the protrusion 514 or the recess 515 is provided. In the illustrated example, a long lever body 521 that rotates in the front-rear direction is provided as an engagement element. The lever body 521 is attached to the outer wall of the movable column 52 via a hinge 521x with a position closer to the upper side than the middle as a rotation center. The lower end of the lever body 521 is bent substantially vertically to form a claw 521y protruding rearward. The end of the lever body 521 above the hinge 521x is slightly refracted and extends substantially vertically upward.

  As shown in FIGS. 15 to 17, in a state where the movable support column 52 is put on the fixed support column 51, the lever body 521 enters the recessed portion 513 of the fixed support column 51, and the claw 521 y is on the rear wall side of the recessed portion 513. It engages with any of the engaging parts. In this connection, the upper edge of the outer wall of the recessed portion 513 in the fixed column 51 is partially cut away in order to prevent the outer wall of the recessed portion 513 from interfering with the hinge 521x in the movable column 52. When the claw 521y is engaged with the engagement portion, the movable support column 52 cannot slide along the fixed support column 51. In order to adjust the height positions of the movable strut 52 and the elbow rest 6, it is necessary to release the sliding movement of the movable strut 52 by releasing the engagement between the claw 521y and the engaging portion. Is rotated around the hinge 521x to displace the claw 521y forward.

  Since the lever body 521 exists inside the movable support column 52, it is difficult for the seated person to actuate it directly. Therefore, in the present embodiment, the movable column 52 is provided with an operation body 522 that receives an operation by a seated person and transmits the received operation force to the lever body 521. The operation body 522 exposes the distal end portion so that the seated person can touch the finger, and engages the lever body 521 at the base end portion to drive it. In the illustrated example, the operating body 522 is supported so as to be able to advance and retreat in the front-rear direction, and the tip end portion projects forward from the movable support column 52.

  When an operating force is not applied to the operating body 522, the operating body 522 is elastically biased by the first biasing means (in the illustrated example, a coil spring) 523 and is positioned at the initial position shown in FIG. At this time, the operation body 522 and the lever body 521 are separated from each other by a predetermined distance.

  When the seated person presses down the operation body 522 so as to hold the movable support column 52, the operation body 522 moves backward from the initial position against the elastic biasing force by the first biasing means 523. Then, when the operation body 522 is displaced backward by a predetermined distance and reaches the driving position shown in FIG. 16, the base end portion comes into contact with the upper end portion of the lever body 521 for the first time. At this time, the lever body 521 still receives little transmission of the operating force. The lever body 521 is elastically urged by a second urging means (in the illustrated example, a coil spring) 524, and assumes the engagement posture shown in FIG. 16 in a state where no operating force is transmitted. That is, the claw 521 y provided at the lower end portion of the lever body 521 engages with the engaging portion formed in the recessed portion 513 of the fixed support column 51.

  When the seated person further presses down the operating body 522, the operating body 522 moves backward from the driving position against the elastic biasing force of the first biasing means 523 and the second biasing means 524. At the same time, the base end portion of the operating body 522 is engaged with the upper end portion of the lever body 521 to transmit the operating force, and the upper end portion is rotated backward and the lower end portion is rotated forward. When the operating body 522 reaches the end position shown in FIG. 17, the lever body 521 takes a release posture. That is, the claw 521y of the lever body 521 is completely detached from the engaging portion of the fixed column 51, and the height positions of the movable column 52 and the elbow rest 6 can be changed.

  When the seated person releases his / her finger from the operation body 522, the operation body 522 returns to the initial position through the driving position, the lever body 521 transits from the release position to the engagement position, and the claw 521y engages with the engagement portion again. In combination, it becomes impossible to change the height positions of the movable column 52 and the elbow rest 6.

  In this embodiment, the hinge 521x is close to the upper end portion of the lever body 521 (in other words, far away from the claw 521y), and the claw 521y moves greatly even if the upper end portion of the lever body 521 is slightly moved. Therefore, if the base end portion of the operation body 522 is brought into contact with the upper end portion of the lever body 521 from the beginning, the fixing of the height position of the movable column 52 is released only by slightly pressing the operation body 522. . This will not only cause difficulty in operability, but may also cause the elbow rest 6 to move up and down inadvertently when another fixture or article comes into contact with the armrest 5. For this reason, the lever body 521 is configured not to operate even if the operation body 522 is operated in the range from the initial position shown in FIG. 15 to the drive position shown in FIG.

  By the way, when the movable column 52 is lifted to a relatively high position, the recessed portion 513 of the fixed column 51 that has been concealed by the movable column 52 is exposed. If the recessed portion 513 is exposed, not only the beauty and appearance of the furniture is impaired, but also dust or the like may enter the recessed portion 513 and hinder the operation of the movable support column 52 and the lever body 521. In order to avoid the above-described problem, in this embodiment, a cover 53 that shields the recessed portion 513 from the inside is attached to the fixed column 51. The cover 53 is, for example, a resin molded product, and scales, numbers, symbols, and the like that are used as a guide for knowing the height positions of the movable support column 52 and the elbow rest 6 are formed on the outer surface (molded or printed). It is attached. In the illustrated example, the slot 516 and the nut hole 517 are formed in advance in the recessed portion 513 of the fixed column 51, while the cover 53 is formed with a locking piece 531 and a screw hole 532 protruding inward, The cover 53 is attached by inserting 531 into the slot 516 and screwing the screw 8 into the nut hole 517 through the screw hole 532.

  According to the present embodiment, the fixed column 51 extending in the predetermined axis L direction and intermittently forming a plurality of engaging portions (projections 514 or recesses 515) in the axis L direction, along the fixed column 51 A movable strut 52 supported so as to be slidable, and an engaging member (lever body 521) that selectively engages any of the engaging portions to fix the relative position of the movable strut 52 to the fixed strut 51. And the armrest A of the chair comprising the armrest 6 provided at the upper end of the movable column 52, the fixed column 51 including the engaging portion is shaped in a side view symmetrical with respect to the axis L. Since it was formed, the fixed support column 51 can be shared between the armrest A disposed on the left side of the chair and the armrest A disposed on the right side.

  Since the engaging portion is formed on the inner surface side of the fixed column 51 so as to form a pair in front and rear with the axis L interposed therebetween, the outer surface side of the fixed column 51 can be made smooth, and furniture It is effective in maintaining aesthetics and grace.

  Further, a connecting portion used for connecting to the chair body C is provided at the lower end portion of the fixed column 51, and the fixed column 51 including the connecting portion is formed into a side view shape symmetrical to the axis L. is doing.

  The fixed column 51 is provided with a recessed portion 513 that opens upward and laterally, and the engaging portion is formed on the inner periphery of the recessed portion 513 and a cover 53 that shields the recessed portion 513 from the side is mounted. Therefore, it is possible to avoid the concave portion 513 from being inadvertently exposed when the height positions of the movable column 52 and the elbow rest 6 are adjusted. In addition, the cover 53 is made of resin, and scales, numbers, symbols, and the like indicating the height position of the movable column 52 or the elbow rest 6 can be easily attached to the surface of the cover 53.

  Further, the movable support column 52 is provided with a rotatable lever body 521 provided with a claw 521y that engages with the engaging portion, and an operation body 522 that receives an operation by a seated person and drives the lever body 521. The lever body 521 is made to function as the engagement element, and the movable struts 52 and the elbow rests 6 can be suitably fixed at the height positions.

  The present invention is not limited to the embodiment described in detail above. For example, the engaging element that engages with the engaging portion formed on the fixed column and fixes the relative position of the movable column is not limited to the rotating lever body, and the shape thereof is not uniquely limited.

  The armpit is not necessarily connected to the back frame of the chair body. The armrests may be connected to the base, the seat or the seat.

  Other specific configurations of the respective parts are not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The perspective view which looked at the chair of one embodiment of the present invention from the front side. The perspective view which looked at the chair from the back side. The side view of the chair. Rear view of the chair The top view of the chair. The side view which shows the synchro-rocking operation | movement of the chair. The side view which shows the state which displaced the upper frame element of the chair back. The perspective view which shows the backrest surface deformation | transformation operation | movement of a figure chair. The top view which shows the backrest surface deformation | transformation operation | movement of the chair. The principal part disassembled perspective view which shows the tension place of the chair, a support body, and a lumbar support member. The principal part disassembled perspective view which shows the armrest which should be arrange | positioned at the right and left both sides of the chair. The principal part front sectional view which shows the connection structure of an armpit and a back frame. The principal part plane sectional view which shows the connection structure of an armpit and a back frame. The principal part side view which shows the convex part provided in the outer surface of a back frame. The principal part side sectional view which shows operation | movement of a lever body and an operation body. The principal part side sectional view which shows operation | movement of a lever body and an operation body. The principal part side sectional view which shows operation | movement of a lever body and an operation body.

Explanation of symbols

A ... Armrest C ... Chair body L ... Axis 5 ... Armrest 51 ... Fixed column 514, 515 ... Engagement part (protrusion, recess)
52 ... Moveable strut 521 ... engagement element (lever body)
53 ... Cover 6 ... Elbow rest

Claims (6)

A fixed column extending in a predetermined axial direction and intermittently forming a plurality of engaging portions in the axial direction;
A movable column supported by the fixed column so as to be slidable along the fixed column ;
An engagement element that selectively engages any of the engagement portions and fixes a relative position of the movable support column to the fixed support column;
An armrest of a chair comprising an armrest provided on an upper end portion of the movable column,
By forming the fixed support column in a side view shape symmetrical to the axis including the engagement portion, an engagement portion is provided between the one disposed on the left side and the one disposed on the right side of the chair. An armrest for a chair characterized by the common use of the entire fixed support including the armrest. The chair armrest according to claim 1, wherein the engaging portion is formed on the inner surface side of the fixed support so as to form a pair in the front-rear direction across the axis. The lower end of the fixed column is provided with a connecting portion used for connecting to the chair body,
The armrest of the chair according to claim 1 or 2, wherein the fixed support column is formed in a side view shape symmetrical to the axis including the connecting portion. A fixed column extending in a predetermined axial direction and intermittently forming a plurality of engaging portions in the axial direction;
A movable strut supported so as to be slidable along the fixed strut;
An engagement element that selectively engages any of the engagement portions and fixes a relative position of the movable support column to the fixed support column;
An elbow rest provided at the upper end of the movable column;
An armrest of a chair comprising:
By forming the fixed strut in a side view shape symmetrical to the axis including the engaging portion, the fixed strut is common between the one disposed on the left side and the one disposed on the right side of the chair. To achieve
The fixed support column is provided with a recessed portion that opens upward and laterally, and the engaging portion is formed on the inner periphery of the recessed portion,
An armrest for a chair, which is equipped with a cover that shields the recessed portion from the side. The armrest of the chair according to claim 4, wherein the fixed support column is made of metal and the cover is made of resin. The movable column is provided with a rotatable lever body provided with a claw that engages with the engaging portion, and an operation body that receives an operation by a seated person and drives the lever body,
The chair armrest according to claim 1, 2, 3, 4, or 5, wherein the lever body functions as the engagement element.

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