JP4936269B2 - Connecting structure of armpit - Google Patents

Description

  The present invention relates to a structure for fixing an armrest while positioning it on a chair body.

Many chairs used in offices have armrests. In this type of chair, as disclosed in, for example, the following patent document, the lower end or rear end of the armrest of the armrest is usually fastened with a plurality of bolts to the side or lower surface of the seat. is there.
Japanese Patent Application Laid-Open No. 11-111365

  However, when the armrest is attached to the chair body, it is necessary to position the armrest with respect to the chair body by some means. In addition, a complicated operation of tightening a plurality of bolts while supporting the armrest with a hand and maintaining it at a required mounting position is forced.

  An object of the present invention made in view of the above is to enable the armrest to be suitably positioned with respect to the chair body and to make the armrest mounting operation simple.

In the present invention, when connecting the armrest supporting the armrest in the armrest to the chair body, one of the armrest and the chair body is provided with a recess that forms a non-circular periphery, and the other is provided with the recess. While providing a convex part to be fitted, a part of the peripheral edge is substantially linear, whereas the other part is relatively largely curved and both are not parallel to each other, An inner taper surface is formed over the entire area, and an outer taper surface that is closely engaged with the inner taper surface is formed over substantially the entire outer periphery of the convex portion, and the convex portion is fitted into the concave portion. The connection structure was adopted. In other words, the armrest is relatively translated with respect to the chair body (in a direction perpendicular to the concave-convex fitting direction) through the concave-convex fitting between the concave and convex portions and the engagement between the inner tapered surface and the outer tapered surface. I tried to deter it from turning and rotating. If it is such, it can position an armrest suitably with respect to a chair main body, and it contributes to the simplification of the installation work of an armrest by extension.

In addition, in the present invention, when connecting the armrest supporting the armrest to the chair body, one of the armrest and the chair body is provided with a recess that forms a non-circular periphery, and the other is provided with the recess Protruding parts to be fitted are provided, and a part of the peripheral edge is substantially linear, while the other part is relatively large and both are not parallel to each other . A second inner tapered surface that forms a first inner tapered surface that inclines from one part toward the inner depth of the concave portion and that inclines toward the inner depth of the concave portion from another portion that is not parallel to the portion. A first outer taper surface that closely engages the first inner taper surface, and a second outer taper surface that closely engages the second inner taper surface. Forming and inserting the convex part into the concave part The rod was adopting a connection structure for connecting with the positioning relative to the chair body.

  If the concave and convex portions have a flat shape whose width and height are different from each other when viewed from the concave / convex fitting direction of the concave and convex portions, the convex portions are enlarged. The effects of improving the strength of the connecting structure and improving the stability by expanding the inner and outer tapered surfaces can be obtained. It is also effective for preventing relative rotation of the armrest relative to the chair body.

  If the connection structure according to the present invention is adopted, the armrest can be attached as required by screwing and tightening one bolt substantially along the direction of the concave-convex fitting between the concave portion and the convex portion. The chair body can be fastened while being positioned. Since it is not necessary to use a plurality of bolts, the cost can be reduced.

  If the bolt is configured to be screwed in from the outer side to the inner side of the armrest, it is easier to attach the armrest to the chair body and to remove the armrest from the chair body.

  If substantially the entire inner tapered surface and outer tapered surface are inclined at the same inclination angle with respect to the concave-convex fitting direction (the axis along) the concave portion and the convex portion, Since force acts evenly on the entire tapered surface when screwing and tightening, desirable effects can be obtained from both the viewpoint of positioning of the armrest and fastening to the chair body.

  According to the present invention, the armrest can be suitably positioned with respect to the chair body, and the armrest mounting operation can be simplified.

  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 and 13, 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, when the armrest 5 that supports the armrest 6 in the armrest A is connected to the chair body C, one of the armrest 5 and the chair body C has a non-circular periphery. While providing the recessed part 511 and providing the other side the convex part 133 which fits into the said recessed part 511, while forming the inner taper surface 511x and 511y over substantially the whole inner periphery of the said recessed part 511, on the other hand, the outer periphery of the said convex part 133 Since the outer tapered surfaces 133x and 133y that tightly engage with the inner tapered surfaces 511x and 511y are formed over substantially the entire area, and the connecting structure in which the protruding portions 133 are fitted into the recessed portions 511 is adopted, The armrest 5 can be suitably positioned with respect to the chair body C through the concave-convex fitting with the convex portion 133 and the engagement between the inner taper surface and the outer taper surface, thereby contributing to the simplification of the mounting work of the armrest A.

  In particular, in the present embodiment, the concave portion 511 is formed with the first inner tapered surface 511x that is inclined from a part of the peripheral edge toward the inner depth of the concave portion 511, and is not parallel to the portion. A first inner tapered surface 511y that is inclined toward the inner depth of the concave portion 511, while the convex portion 133 closely engages with the first inner tapered surface 511x. 133x, a second outer tapered surface 133y that closely engages with the second inner tapered surface 511y is formed, and the convex portion 133 is fitted into the concave portion 511 so that the armrest 5 is attached to the chair body C. It is connected while positioning.

  The concave portion 511 and the convex portion 133 have a flat shape whose width and height are different from each other when viewed from the direction of concave / convex fitting between the concave portion 511 and the convex portion 133 (that is, in a side view). Therefore, the effect of improving the strength of the connection structure by enlarging the convex portion 133 and improving the stability by expanding the inner and outer tapered surfaces can be obtained. It is also effective to prevent relative rotation of the armrest 5 with respect to the chair body C.

  If the connection structure of the present embodiment is adopted, the arm 5 is required by screwing and tightening a single bolt 7 substantially along the direction of the concave-convex fitting between the concave portion 511 and the convex portion 133. The chair body C can be fastened while being positioned at the mounting position. Since it is not necessary to use a plurality of bolts, the cost can be reduced.

  As shown in FIGS. 12 and 13, the inner tapered surface (first inner tapered surface 511x, second inner tapered surface 511y) and the outer tapered surface (first outer tapered surface 133x, second Since substantially the entire outer tapered surface 133y) is inclined at the same inclination angle with respect to the concave-convex fitting direction of the concave portion 511 and the convex portion 133, the tapered surface 511x is secured when the bolt 7 is screwed and tightened. 511y, 133x, and 133y are uniformly applied with force, and desirable effects can be obtained from the viewpoint of both positioning of the armrest 5 and fastening to the chair body C.

  Since the bolt 7 is screwed in from the outer side of the armrest 5 toward the inner side, it is easier to attach the armrest A to the chair body C and to remove the armrest A from the chair body C. Become.

  Thus, the armrest 5 is connected to the back frame 11 of the chair body C, the armrest 5 is provided with the recess 511, and the back frame 11 is provided with the projection 133. The strength required for the frame can be secured.

  The present invention is not limited to the embodiment described in detail above. For example, the armrest is not necessarily connected to the back frame of the chair body. Of course, it is also conceivable to connect the armrests to the base body, seat rest or seat.

  In addition, a convex / concave fitting structure may be constructed by providing a convex portion on the armpit side and a concave portion on the chair body side.

  Further, in the above embodiment, the bolt insertion hole is drilled in the back wall of the recess, and the female screw hole is drilled in the projection, but conversely, the bolt insertion hole is drilled in the projection and the back wall of the recess is formed. A female screw hole may be formed. In this case, the male screw of the bolt is screwed into the back wall of the concave portion (not to the convex portion).

  In addition, the shapes of the concave portion and its inner tapered surface, and the convex portion and its outer tapered surface are not uniquely limited. It is also conceivable to construct a concave-convex fitting structure by forming the convex part into a truncated pyramid shape, a truncated elliptical cone shape, etc., and forming the concave part into a shape corresponding to this.

  Furthermore, in the above embodiment, the first inner (outer) tapered surface and the second inner (outer) tapered surface are made continuous to form an integral tapered surface. This does not hinder the aspect in which the second inner (outer) tapered surface is discontinuous.

  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 11 ... Back frame 133 ... Convex portion 133x ... First outer taper surface 133y ... Second outer taper surface 5 ... Elbow collar 511 ... Concave portion 511x ... First inner taper surface 511y ... Second Inner taper surface 7 ... Bolt

Claims (6)

It is a structure for connecting the armrest supporting the armrest to the chair body,
While providing a concave portion that forms a non-circular periphery on one of the armrest and the chair body, and providing a convex portion that fits the concave portion on the other,
A portion of the periphery is generally linear, while the other portion is relatively large and both are non-parallel,
Forming an inner tapered surface over substantially the entire inner periphery of the concave portion, while forming an outer tapered surface that closely engages the inner tapered surface over the substantially entire outer periphery of the convex portion;
A connecting structure for an armrest, wherein the armrest is connected to the chair body while being positioned by fitting the protrusion into the recess. It is a structure for connecting the armrest supporting the armrest to the chair body,
While providing a concave portion that forms a non-circular periphery on one of the armrest and the chair body, and providing a convex portion that fits the concave portion on the other,
A portion of the periphery is generally linear, while the other portion is relatively large and both are non-parallel,
In the concave portion, a first inner tapered surface is formed which is inclined from a part of the peripheral edge toward the inner depth of the concave portion, and is inclined toward the inner depth of the concave portion from another portion which is not parallel to the portion. While forming a second inner taper surface
In the convex portion, a first outer tapered surface that is tightly engaged with the first inner tapered surface, and a second outer tapered surface that is closely engaged with the second inner tapered surface are formed,
A connecting structure for an armrest, wherein the armrest is connected to the chair body while being positioned by fitting the protrusion into the recess. The armpit according to claim 1 or 2, wherein the concave and convex portions have a flat shape with different width dimensions and height dimensions when viewed from the direction of concave-convex fitting between the concave portions and the convex portions. Connection structure. The said armrest is fastened to the said chair main body by screwing in and tightening one bolt substantially along the direction of the uneven | corrugated fitting of the said recessed part and the said convex part, The Claim 1, 2, or 3 Connecting structure of the elbow. The connecting structure of the armrest according to claim 4, wherein a bolt is screwed in from the outer side to the inner side of the armrest. The substantially whole of the said inner taper surface and the said outer taper surface incline with the same inclination | tilt angle with respect to the direction of the uneven | corrugated fitting of the said recessed part and the said convex part. Connecting structure of the armpit.

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