JP2014083116A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair having such a structure that the armrest body is movable in a direction crossing the vertical direction and yet capable of smoothly interlocking a movable operation part in the armrest body side with a variable mechanism part of a chair body side.SOLUTION: An armrest body 16 is configured to move in a direction crossing the vertical direction via a moving guide mechanism 18. The armrest body 16 is formed with an opening part at a bottom thereof for leading in a cable 24, one end of which is connected to the variable mechanism part of the chair body side. The cable 24 has a curved bend part 75 at a part between a lead-in position from the opening and a connection position with an operation lever 67, the curved bend part 75 being curved into a loop shape in a direction crossing the vertical direction in the armrest body 16 and changing the curved form in association with the movement of the armrest body 16 in the direction crossing the vertical direction.

Description

  The present invention relates to a chair provided with an armrest on which a seated person sitting on a chair body places an elbow tip.

  As a chair with an armrest, an armrest body supported on an upper part of an armrest column that stands upward from the side of the seat body of the chair body so as to be movable in a substantially horizontal direction (a direction intersecting the vertical direction) is proposed. (For example, refer to Patent Document 1).

  The chair described in Patent Document 1 has a support protrusion protruding at the upper center of the armrest column, and a movable block unit that allows rotation, back-and-forth movement, and left-right movement in a substantially horizontal plane is attached to the support protrusion. The armrest body is supported by the movable block unit.

  In addition, as another type of chair equipped with an armrest, the movable operation part (operation lever) for operating the variable mechanism part on the chair body side such as the unlocking part of the seat lifting mechanism is close to the seated person's hand What was provided in the main body is known (for example, refer patent documents 2-4).

US Pat. No. 7,159,947 Japanese Utility Model Publication No. 54-142104 Japanese Patent No. 4050949 JP 2012-010937 A

  By the way, at present, in the chair as described in Patent Document 1 in which the armrest body can be freely moved in a substantially horizontal direction with respect to the armrest column, the chair body side is variable like the chairs described in Patent Documents 2 to 4. We are investigating the provision of a movable operating part on the armrest body to remotely control the mechanism.

However, in the chairs described in Patent Documents 2 to 4, the variable mechanism part on the chair body side and the movable operation part on the armrest body side are connected to each other by a cable, and the cable is connected to the inside of the armrest column and the armrest body. When this technology is applied as it is to the chair described in Patent Document 1, when the armrest main body moves in a substantially horizontal direction with respect to the armrest strut, it is arranged from the upper end of the armrest strut. The cable drawing position and the connection position on the movable operation portion side of the cable change relatively.
For this reason, at the time of the movement operation of the armrest main body in the substantially horizontal direction, there is a concern that the cable may be stretched and the smooth operation may be hindered, or that the cable may slide and wear against surrounding members.

  Accordingly, the present invention provides a chair that can smoothly move the armrest body side movable operation section and the chair body side variable mechanism section while the armrest body is movable in the direction intersecting the vertical direction. It is something to try.

The chair according to the present invention employs the following configuration in order to solve the above problems.
The invention according to claim 1 is a chair body having a seating body for sitting and a variable mechanism part, an armrest strut standing upward on a side of the seat body of the chair body, and an upper part of the armrest strut, An armrest body supported so as to be movable in a direction intersecting with the vertical direction; a movable operation section attached to the armrest body for remotely operating the variable mechanism section of the chair body; the movable operation section and the variable mechanism section; And an opening for drawing the cable, one end of which is connected to the variable mechanism portion, into the armrest body. Between the retracted position from the opening and the connecting position with the movable operation section, the armrest body is curved in a loop shape in a direction intersecting the vertical direction within the armrest body, and intersects with the vertical direction of the armrest body. It is characterized in that the bending flexure bend shape changes with the movement direction is provided for.
As a result, when the armrest body moves in a direction intersecting the vertical direction with respect to the armrest column, the bending form of the bending portion of the cable in the armrest body, that is, the bending shape of the cable and the pulling direction change. To do. As a result, the cable follows the movement of the armrest body without difficulty.

The invention according to claim 2 is characterized in that, in the chair according to claim 1, the armrest body is provided with a permissible space that allows a change in the bending form of the bending portion of the cable. is there.
Thereby, the curve bending part of a cable changes a curve form in the tolerance space in an armrest main body, and a curve bending part becomes difficult to contact a surrounding member.

The invention according to claim 3 is the chair according to claim 2, wherein the armrest main body includes a lower layer member having the opening and an upper layer member attached to an upper portion of the lower layer member, and the allowable space is the It is formed between the lower layer member and the upper layer member.
As a result, the cable can be greatly deformed within a wide allowable space formed between the lower layer member and the upper layer member. Therefore, it is possible to ensure a large loop length of the curved bending portion, and thus it is possible to ensure a large amount of movement of the armrest body with respect to the armrest strut.

According to a fourth aspect of the present invention, in the chair according to the second or third aspect, the armrest main body is moved relative to the armrest support column in a direction intersecting the vertical direction above the opening in the armrest main body. A movable guide mechanism is provided, and the allowable space is provided at a position spaced apart from the opening in the armrest main body in a direction intersecting the vertical direction, and the cable is drawn into the armrest main body from the opening. Is routed in the allowable space direction from below the movement guide mechanism.
Thereby, the loop-shaped curved bending portion of the cable arranged in the permissible space is positioned away from the opening of the armrest body, and when the movement guide mechanism and the armrest body move relative to each other, The cable will not interfere with its relative movement.

The invention according to claim 5 is the chair according to any one of claims 1 to 4, wherein the cable includes a cylindrical outer cable, an inner cable slidably held in the outer cable, And both ends of the inner cable are connected to the variable mechanism portion and the movable operation portion, and a part of the outer cable is fixed to a place other than the allowable space in the armrest body. It is characterized by.
Thereby, since a part of outer cable is restrained in places other than permissible space in an armrest main part, a cable does not move greatly in an armrest main part, and it does not prevent movement of an armrest main part.

The invention according to claim 6 is the chair according to claim 5, wherein a stroke amplification mechanism for amplifying the operation stroke of the movable operation unit is interposed between one end of the inner cable and the movable operation unit. It is characterized by being.
As a result, since the operation stroke of the movable operation unit is amplified by the stroke amplification mechanism, the operation force of the variable operation piece is surely applied to the variable mechanism unit on the chair body side even when the bending portion of the cable is enlarged. It becomes possible to communicate.

The invention according to claim 7 is the chair according to claim 6, wherein the stroke amplification mechanism includes a moving pulley at least in part.
This makes it possible to reliably amplify the operation stroke of the movable operation section even when the stroke amplification mechanism is inevitably disposed in a complicated part or a narrow space.

  According to the present invention, when the armrest main body moves in the direction intersecting with the vertical direction, the curve bending portion of the cable changes in the armrest main body along with the movement, so that the armrest main body intersects with the vertical direction. The movable operation part on the armrest main body side and the variable mechanism part on the chair main body side can be smoothly interlocked with each other while being movable.

It is a perspective view of the chair of one Embodiment of this invention. It is a perspective view centering on the backrest support body of the chair of one Embodiment of this invention. It is a perspective view of the armrest part of the chair of one Embodiment of this invention. It is an inner side view of the armrest part of the chair of one Embodiment of this invention. It is a disassembled perspective view of the armrest part of the chair of one Embodiment of this invention. It is the disassembled perspective view which expanded a part of FIG. 5 of the chair of one Embodiment of this invention. It is the disassembled perspective view which expanded a part of FIG. 5 of the chair of one Embodiment of this invention. It is the disassembled perspective view which expanded a part of FIG. 5 of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the AA cross section of FIG. 4 of the armrest part of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the BB cross section of FIG. 9 of the armrest part of the chair of one Embodiment of this invention. It is a partial section top view of the armrest component of the chair of one Embodiment of this invention. It is a partial section top view of the armrest component of the chair of one Embodiment of this invention. It is sectional drawing corresponding to CC cross section of FIG. 10 of the armrest part of the chair of one Embodiment of this invention. It is sectional drawing corresponding to CC cross section of FIG. 10 of the armrest part of the chair of one Embodiment of this invention. It is the perspective view which fractured | ruptured the armrest part of the chair of one Embodiment of this invention in the DD cross section part of FIG. It is a disassembled perspective view of the armrest part of the chair of one Embodiment of this invention. It is a top view of the armrest main body of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the EE cross section of FIG. 17 of the armrest main body of the chair of one Embodiment of this invention. It is a top view of the armrest main body of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the FF cross section of FIG. 19 of the armrest main body of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the HH cross section of FIG. 7 of the armrest part of the chair of one Embodiment of this invention. It is a top view of the inner cylinder member provided in the armrest part of the chair of one Embodiment of this invention. It is a perspective view of the locking member attached to the upper part of the inner cylinder member of the chair of one Embodiment of this invention. It is a top view of the armrest main body of the chair of one Embodiment of this invention. It is a top view of the armrest main body of the chair of one Embodiment of this invention. It is a top view of the armrest main body of the chair of one Embodiment of this invention. It is a top view which shows collectively the various behavior of the armrest main body of the chair of one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, in the chair 1 shown in FIG. 1, the direction indicated by the arrow FR facing the front of the person seated in the normal posture is referred to as “front”, and the direction indicated by the arrow RR on the opposite side is referred to as “rear”. The direction indicated by the arrow LH to the left of the seated person is referred to as “left”, and the direction indicated by the arrow RH on the opposite side is referred to as “right”. In addition, “upper” and “lower” mean the side that becomes the upper side in the vertical direction and the side that becomes the lower side in the vertical direction when the chair 1 is installed on the horizontal plane, unless otherwise specified. And In the drawings other than FIG. 1, the arrows FR, RR, LH, and LH, which are the same as those in FIG. 1, are added as appropriate to clarify the orientation of each part of the chair 1.

FIG. 1 is a diagram showing an overall configuration of a chair 1 of this embodiment.
As shown in the figure, a chair 1 of this embodiment includes a multi-leg 3 with casters 2, a pedestal 4 that stands up from the center of the multi-leg 3 and incorporates a gas spring that is a lifting mechanism, and a pedestal 4 A box-like support base 6 that is attached to the upper end of the support base 5 and supports the seat body 5, and is pivotally attached to both left and right sides of the support base 6, and a reclining device (variable mechanism part) (not shown) in the support base 6. An L-shaped backrest support body 7 that can be tilted, a backrest body 8 that is attached to the front surface of the back upper part of the backrest support body 7, and a backrest support body 7 that is attached to the backrest support body 7. A pair of left and right armrests 9 and 9 is placed.
In this embodiment, the backrest support body 7 and the backrest body 8 constitute a backrest 10, and the seat body 5, the support base 6, the backrest 10, the multi-leg 3, the pedestal 4, and the like are the chair body 11. Is configured. In addition to the above reclining device, the support base 6 includes a lock release mechanism (variable mechanism portion) (not shown) of the gas spring in the pedestal 4.

FIG. 2 is a diagram showing details of the backrest support 7.
The backrest support body 7 is made of a metal material such as an aluminum alloy, and as shown in the drawing, the backrest body 12 is arranged at the lower rear of the backrest body 8 and is branched to the left and right below the upright section 12. A pair of left and right forward arms 13 and 13 extending while curving forward are integrally provided. On both the left and right sides of the support base 6, the rotation shafts 62 (see FIG. 1) of the internal reclining device protrude along the left-right direction. The pivot shaft 62 is connected to the front end portions of the left and right forward arm portions 13 and 13 of the back support 7 so as to be integrally rotatable. Therefore, the backrest 10 is supported by the pedestal 4 via the reclining device in the support base 6, and the tilting posture can be freely adjusted by the function of the reclining device.

  In an intermediate region near the front part of the left and right forward arm parts 13, a seat body connecting part 14 that extends obliquely upward is projected, and the upper end of the seat body connecting part 14 is substantially the front-rear direction of the seat body 5. It is pivotally connected to the corresponding side in the center. Further, the lower surface of the front portion of the seat body 5 is slidably supported on the inclined surface of the front upper portion of the support base 6. Therefore, when the backrest 10 is tilted rearward and downward, the seat body 5 is slightly pulled rearward while being tilted rearward by being pulled downward by the seat body connecting portion 14.

FIG. 3 and subsequent figures show details of the armrest 9.
As shown in FIGS. 3 and 4, the armrest 9 has a lower end connected to the side surface of the corresponding forward arm 13 on the outer side in the left-right direction, and extends upward from the connecting portion through the side of the seat body 5. An armrest strut 15 and an armrest main body 16 supported by the upper end portion of the armrest strut 15 are provided. The left and right armrests 9 and 9 have basically the same structure, although the directions of the armrest struts 15 are different.

  The armrest strut 15 includes a lower strut body 15A connected to the side surface of the forward arm 13 and an elevating cylinder 15B that is slidably viewed along the longitudinal direction in the upper area of the strut body 15A. The raising / lowering cylinder 15B is assembled | attached with respect to the support | pillar main body 15A so that raising / lowering is possible via the height adjustment mechanism 17 (refer FIG. 10) explained in full detail behind.

  The main part of the armrest main body 16 accommodates the main part of the movement guide mechanism 18 (see FIG. 8). It is supported so as to be movable in the direction that intersects the vertical direction.

FIG. 5 is an exploded perspective view showing components of the armrest 9, FIG. 6 is an exploded perspective view showing the column main body 15A and its accompanying parts in an enlarged manner, and FIG. 7 is a drawing of the lifting cylinder 15B and its accompanying parts. FIG. 8 is an exploded perspective view showing a part of the accompanying parts of the lifting cylinder 15B and a part of the components of the armrest body 16 in an enlarged manner. 9 is a cross-sectional view corresponding to the AA cross section of FIG. 4, and FIG. 10 is a cross-sectional view corresponding to the BB cross section of FIG.
As shown in FIGS. 6, 9, and 10, the column main body 15 </ b> A includes a lateral extension region that extends outward in the left-right direction from the connecting portion with the forward arm portion 13, and a lateral extension region thereof. And a standing region extending upward while being curved upward, and the entire front view is substantially L-shaped. A substantially entire region in the extending direction of the column main body 15A has a substantially elliptical cross-sectional shape that is long in the front-rear direction. Further, the column main body 15A is made of a metal column base material 19 such as an aluminum alloy that forms the main outer shape of the column main body 15A and the upper side of the laterally extending region of the column base material 19 on the inner side in the left-right direction of the standing region. And a resin cover member 20 that covers a part of the side surface.

The column base 19 is formed in a cylindrical shape at the upper end portion of the standing region, and is formed in two continuous grooves at a portion extending from the inner side surface of the standing region and the upper surface of the laterally extending region below the cylindrical portion. 21 and 22 are formed. One groove 21 of the two grooves 21 and 22 is arranged at the approximate center in the front-rear direction of the horizontal section of the standing region, and is a loose insertion groove (hereinafter referred to as “loose insertion”) into which a rotating rod 23 described later is inserted. The other groove 22 is arranged at a position biased to the rear side of the horizontal cross section of the standing region, and the variable mechanism portion (the reclining device or the gas in the support base 6). A cable routing groove (hereinafter referred to as “cable routing groove 22”) in which a cable 24 for operating a spring unlocking mechanism) is routed. The loose insertion groove 21 disappears in the middle of the lateral extension region of the support base 19, and the cable routing groove 22 continues to the vicinity of the end portion of the support base 19 in the lateral extension region. ing. In the cable routing groove 22, the groove width is enlarged in the front side in the vicinity of the terminal portion of the support base 19.
The above-described cover member 20 is attached to the support base 19 so as to cover almost the entire area except for the partial region on the upper side of the loose insertion groove 21 and the cable routing groove 22.

  The cylindrical portion at the upper end of the support base 19 accommodates a lock member 25 constituting the height adjustment mechanism 17 and a biasing spring 26 that biases the lock member 25 forward. The lock member 25 has an outer surface shape in which a locking pin 25b protrudes from an end portion on the long diameter side of an elliptical cylindrical body portion 25a. The front wall of the cylindrical portion at the upper end of the support base 19 is formed with a notch window 27 that opens to the front side, and the locking pin 25b of the lock member 25 disposed inside the cylindrical portion is this notch. The window 27 is inserted. The locking pin 25b protrudes from the notch window 27 with the forward displacement of the body portion 25a, and retreats into the notch window 27 with the rearward displacement of the body portion 25a from that state.

  As described above, after the lock member 25 and the urging spring 26 are accommodated inside the cylindrical portion, the end cap 28 is fixed to the upper end surface of the column base material 19 with screws. The end cap 28 is formed in a substantially oval shape that substantially matches the cross-sectional shape of the upper end of the column base material 19, and has a long hole in the center in the front-rear direction that is long in the left-right direction in which the rotating rod 23 is loosely inserted. 29 is formed. Further, a cable insertion groove 30 for drawing the cable 24 into the support base 19 is formed in a region biased to the rear side on the end cap 28. The cable insertion groove 30 is biased outward in the left-right direction of the end cap 28 in order to prevent the cable 24 drawn into the support base 19 from interfering with the urging spring 26 directly below the end cap 28. Formed in the region.

  A pair of halved cylindrical cover walls 31, 31 are fitted and attached to the outer peripheral surface on the upper side of the column base material 19 with the end cap 28 attached to the upper end. The cover wall 31 is provided with a plurality of ribs 32 extending in the vertical direction on the outer surface, and the outer surface including the ribs 32 is slidably in contact with the inner surface of the elevating cylinder 15B. Further, the cover walls 31 and 31 are provided with a notch groove 33 for allowing the locking pin 25b of the lock member 25 to protrude.

On the other hand, as shown in FIGS. 7, 9, and 10, the elevating cylinder 15 </ b> B includes an elliptical cylindrical outer cylinder member 34 whose upper portion is enlarged in a step shape, and a half fixed to the inner side of the outer cylinder member 34. A pair of split cylindrical inner cylinder members 35A and 35B.
The step-shaped expanding wall 36 at the upper part of the outer cylinder member 34 is formed to bulge toward the front side and gradually narrow toward the front end side, and is formed on the lower surface of the bulging region on the front side. As shown in FIG. 10, a substantially rectangular opening 38 in which the lock release lever 37 of the height adjusting mechanism 17 is disposed is formed.

One inner cylinder member 35A arranged on the front side of the pair of inner cylinder members 35A, 35B is formed with a plurality of fitting holes 48 spaced apart at equal intervals along the longitudinal direction of the half cylinder portion. In addition, a top wall block 39 is formed at the upper end of the half cylinder portion to block the upper portion of one inner cylinder member 35A and the upper portion of the other inner cylinder member 35B across the both.
On the top surface of the top wall block 39, a receiving recess 49 for accommodating the slider 50 shown in FIGS. 8 to 10 is slidable back and forth, and a locking flange 40 is provided at the opening edge on the upper side of the receiving recess 49. It is extended. The receiving recess 49 is formed with a constant width in the left-right direction and is open to the front side. A lock release lever 37 is rotatably disposed in front of the opening of the receiving recess 49. The slider 50 is engaged with the lock release lever 37 so as to be interlocked with each other, and converts the rotation operation of the lock release lever 37 into the forward / backward operation in the front-rear direction.

One inner cylinder member 35 </ b> A and the other inner cylinder member 35 </ b> B are fixed to each other by concave and convex fitting, and are fixed inside the outer cylinder member 34 in this state. When the inner cylinder members 35A and 35B are fixed to the inner side of the outer cylinder member 34, their inner peripheral surfaces are slidably fitted into the upright region of the column main body 15A. At this time, the locking pin 25b of the lock member 25 that is urged by the urging spring 26 and protrudes forward from the upright region of the column main body 15A is fitted to any one of the half cylindrical portions of the one inner cylinder member 35A. The fitting hole 48 is fitted, whereby the raising / lowering position of the raising / lowering cylinder 15B with respect to the column main body 15A is locked.
As shown in FIGS. 21 and 22, a through hole 41 into which the rotating rod 23 is loosely inserted is formed at the center of the bottom wall of the receiving recess 49 in the front-rear direction. A cable insertion hole 42 described in detail later is formed at a position adjacent to the rear side of the through hole 41. The cable 24 is inserted into the cable insertion hole 42 together with the holding member 43, and the holding member 43 is locked and fixed to the cable insertion hole 42.

  Here, the inner cylinder members 35A and 35B arranged on the inner side of the outer cylinder member 34 are such that the locking flange 40 of the top wall block 39 of one inner cylinder member 35A is the stepped portion of the expansion wall 36 of the outer cylinder member 34. It is mounted on the stepped portion together with the metal support base member 44 shown in FIGS. The support base member 44 is formed in a shape that substantially matches the inner surface of the expanding wall 36 of the outer cylinder member 34. The support base member 44 is disposed on the inner side of the expanding wall 36 so as to overlap the upper portion of the top wall block 39, and is fixed to the outer cylinder member 34 together with the top wall block 39 in this state. The opening at the upper end is almost closed.

  The support base member 44 has a support boss 45 that pivotably supports the armrest body 16 so as to protrude from the center of the upper surface thereof, and a pair of lever support arms 46, 46 ( (See FIG. 8). The lever support arms 46, 46 are disposed on the lower surface of the support base member 44 so as to be spaced apart in the left-right direction, and rotatably support the rotation shaft 47 of the lock release lever 37 that extends along the left-right direction. Therefore, the lock release lever 37 is attached to the outer cylinder member 34 in a state where it is pivotally supported on the lower surface side of the support base member 44. Further, at a position adjacent to the rear side of the support boss 45 of the support base member 44, a long hole 58 that is long in the left-right direction for drawing the cable 24 inside the armrest column 15 (elevating cylinder 15B) is formed.

  The height adjusting mechanism 17 in the armrest 9 includes a lock member 25 having the locking pin 25b described above, and an inner cylinder member 35A having a plurality of fitting holes 48 to which the locking pin 25b is selectively fitted. A lock release lever 37 that is rotated by a seated person at the front end of the upper end of the outer cylinder member 34, and a slider 50 and a rotary rod 23 that transmit the operation force of the lock release lever 37 to the lock member 25. Yes.

Hereinafter, a specific structure of the height adjusting mechanism 17 will be described.
FIGS. 11 and 12 are partial cross-sectional top views showing the engagement state between the slider 50 and the rotary rod 23, and FIGS. 13 and 14 show the engagement state between the rotary rod 23 and the lock member 25. FIG. 15 is a cross-sectional view corresponding to the CC cross section of FIG. 10, and FIG. 15 is a perspective view taken along the DD cross section of FIG.
As shown in FIGS. 13 and 14, the locking member 25 has a cylindrical locking pin 25b protruding from the center of the front surface of the oval cylindrical body portion 25a, and is engaged with the center of the rear surface of the body portion 25a. A pin hole 25c that is coaxial with the stop pin 25b and opens to the rear side is formed. In addition, a protrusion 25d that protrudes inward in the left-right direction is provided on the inner surface of the outer wall in the left-right direction of the body 25a. A turning rod 23 is inserted inside the body portion 25a, and the turning rod 23 and the body portion 25a are engaged with each other via a projection 25d.

A shaft support screw 51 having a distal end shaft portion 51 a is screwed to the rear wall of the upright region of the column base material 19. The distal end shaft portion 51 a of the shaft support screw 51 protrudes forward in the column base material 19 and is fitted into the pin hole 25 c of the body portion 25 a of the lock member 25. The tip shaft 51a is slidable in the axial direction and the rotation direction with respect to the pin hole 25c. The notch window 27 into which the locking pin 25b of the locking member 25 is inserted on the front wall of the support base 19 has an arc shape with the lower end side extending along the outer peripheral surface of the locking pin 25b. The sliding operation in the direction and the rotation direction is possible.
Therefore, the lock member 25 can be tilted in the left-right direction by the locking pin 25 b and the tip shaft portion 51 a of the shaft support screw 51 arranged coaxially. The urging spring 26 that urges the lock member 25 forward is disposed on the outer periphery of the distal end shaft portion 51 a of the shaft support screw 51.

  As shown in FIGS. 8 to 10, the rotary rod 23 includes a shaft portion 23 a that is inserted into the standing region of the column main body 15 </ b> A, a small-diameter shaft portion 23 b that is continuously reduced in diameter in a stepped shape, and an upper portion thereof. The portion to be operated 23c that is continuously expanded in a step shape is coaxially provided.

The shaft portion 23a is appropriately thinned so as to leave a longitudinal rib along the axial direction and a lateral rib perpendicular to the axial direction on the outer periphery thereof, and as shown in FIGS. A longitudinal groove 52 is formed along the axial direction on the outer surface of the locking member 25 on the same side as the protrusion 25d. The vertical groove 52 is slidably engaged with a protrusion 25d protruding from the body 25a when the shaft 23a is inserted through the body 25a of the lock member 25. Since the vertical groove 52 is continuously formed along the longitudinal direction (axial direction) of the shaft portion 23a, even if the rotary rod 23 moves up and down together with the lifting cylinder 15B, regardless of the moving height thereof. The engagement relationship between the vertical groove 52 and the protrusion 25d on the lock member 25 side is maintained. When the pivot rod 23 is pivoted by operating the lock release lever 37, the wall of the vertical groove 52 moves the lock member 25 in the backward direction (unlock direction) as shown in FIG.
In the case of this embodiment, the lower end of the rotary rod 23 moves in the loose insertion groove 21 in the column main body 15A (the column base material 19) as the elevating cylinder 15B moves up and down. At this time, the column main body 15A The posture of the rotary rod 23 tilts in the left-right direction as the curve changes inward in the left-right direction of the lower edge. However, since the lock member 25 can be tilted in the left-right direction by the locking pin 25b and the shaft support screw 51 as described above, the lock member 25 can be moved even if the attitude of the rotary rod 23 changes. Flexibly follow posture changes. Therefore, the engagement state between the vertical groove 52 of the rotating rod 23 and the protrusion 25d of the lock member 25 is stably maintained.

  As shown in FIGS. 8, 11, and 12, the operated portion 23 c is integrally formed with a disk-shaped retaining flange 60 at the upper end portion, and an outer periphery in a region below the retaining flange 60. A notch 61 including a pressed surface 61a substantially orthogonal to the surface is provided. An operating force is transmitted from the slider 50 to the rotating rod 23 through the pressed surface 61a.

  The slider 50 is formed in a substantially rectangular shape that is long in the front-rear direction in plan view. As shown in FIGS. 8 and 10, an upper projecting piece 53, which is an action portion of the lock release lever 37, is inserted into the front edge portion. An input-side opening 54 to be joined is formed, and an output-side opening 55 is formed at the rear edge of the operated portion 23c of the rotating rod 23 so as to penetrate from below to be engaged.

  The upper projecting piece 53 of the unlock lever 37 is input to the slider 50 when the operation surface at the lower end of the unlock lever 37 is turned upward against the force of the biasing spring 59 shown in FIG. The entire slider 50 is slid and displaced backward while being inserted and engaged with the side opening 54.

As shown in FIGS. 11 and 12, the output side opening 55 is formed in a substantially rectangular shape that is long in the front-rear direction, and a retaining flange 60 of the rotary rod 23 can abut on the upper surface side at the edge thereof. An inward flange 56 is provided. A protruding piece 57 is formed on the inward flange 56 on the outer side in the left-right direction.
As shown in FIG. 11, the rear end portion of the protruding piece 57 abuts against the pressed surface 61 a at a position spaced from the axis of the rotary rod 23 when the slider 50 is in the initial position on the front side. In this state, when the slider 50 moves backward as shown in FIG. 12, the pressed surface 61 a is pressed around the axis of the rotary rod 23 with the backward movement. As a result, the pivot rod 23 rotates a predetermined angle in the clockwise direction in the drawing.
Therefore, when the unlocking lever 37 is pushed upward, the operating force is converted into the backward displacement of the slider 50 and then converted into the rotation of the rotary rod 23, and the rotation of the rotary rod 23 is further changed. It is converted into a backward operation of the lock member 25. Thereby, the locking pin 25b of the lock member 25 is pulled out from the fitting hole 48 of the inner cylinder member 35A, and the height of the armrest main body 16 (elevating cylinder 15B) can be adjusted. When the operation of the lock release lever 37 is released after the armrest body 16 (elevating cylinder 15B) is adjusted to an arbitrary height, the locking pin 25b of the lock member 25 is fitted to the corresponding height at the new height position. The hole 48 is inserted and engaged.

16 to 20 are diagrams showing the internal structure of the armrest body 16.
As shown in FIG. 8 and FIGS. 16 to 20, the armrest body 16 includes an armrest base 65 that is long in the front-rear direction, with front and rear ends curved in a convex shape and a concave storage space is provided on the upper surface side. The armrest base 65 is attached to the armrest base 65 so as to cover the storage space on the upper surface side of the armrest base 65, the cover member 66 whose upper surface functions as an elbow rest, and the support base member 44 on the armrest strut 15 side. A movement guide mechanism 18 that is supported so as to be movable in a substantially horizontal direction, and an operation lever 67 (movable operation section) for remotely operating the variable mechanism section in the support base 6 via the cable 24 are provided. As shown in FIG. 5, the cover member 66 of this embodiment includes a cover skeleton 66a that is directly attached to the armrest base 65, and a cover skin 66b that is attached to the upper part of the cover skeleton 66b. Yes.

  The armrest base 65 has a comparatively large-sized substantially rectangular opening 68 that is long in the front-rear direction in the center region in the front-rear direction, and a control lever 67 that is rotatably attached to the front-side region. A small opening 69 (see FIG. 10) is formed. The central opening 68 has a pair of side walls 68a and 68a extending in the front-rear direction and parallel to each other. In addition, a pair of guide walls 70, 70 parallel to the side walls 68a, 68a project from the edge in the left-right direction on the upper surface side of the opening 68 of the armrest base 65. A plurality of concave and convex engaging portions 70a... Are formed along the front-rear direction on the surfaces of the guide walls 70, 70 facing each other. Further, the front end portions of the left and right guide walls 70 are connected to each other by a connecting rib 71 projecting from the upper surface of the armrest base 65.

On the rear side of the central opening 68 in the upper surface of the armrest base 65, a substantially semicircular rear portion in which the cable 24 surrounded by the rear peripheral wall 65 a of the armrest base 65 and routed in a loop shape is disposed. A flat surface 72 is provided. The rear flat surface 72 has a boss 73 protruding from the center of the upper surface for screwing the cover member 66. The rear flat surface 72 forms a permissible space 74 that allows a change in the curved shape of the cable 24 with the cover member 66 in a state where the cover member 66 is attached to the upper portion of the armrest base 65. The permissible space 74 accommodates a curved bending portion 75 that curves in a loop in a substantially horizontal plane between the drawing position of the cable 24 from the opening 69 and the connection position with the operation lever 67. The
When the armrest body 16 moves in a substantially horizontal direction via the movement guide mechanism 18, the bending shape of the bending portion 75 of the cable 24 changes such as a bending shape and a pulling direction.

  As shown in FIG. 8, the movement guide mechanism 18 is held in the armrest base 65 so as to be movable in the front-rear direction, and to be moved in the left-right direction by the front-rear movement guide block 76. A left-right motion guide block 77 and a rotation guide block 78 rotatably supported by the left-right motion guide block 77 are provided. The rotation guide block 78 is integrated with the support boss 45 of the support base member 44 by a screw 63. Are combined.

24 to 26 are views showing a state of movement of the armrest base 65 by the movement guide mechanism 18.
Rotation of the armrest base 65 with respect to the support base member 44 is permitted when the left and right motion guide block 77 rotates relative to the rotation guide block 78 as shown in FIG. The movement of 65 in the left-right direction is permitted by the relative movement of the longitudinal movement guide block 76 relative to the left-right movement guide block 77 in the left-right direction, as shown in FIG. Further, the movement of the armrest base 65 in the front-rear direction with respect to the support base member 44 is allowed by the relative movement of the armrest base 65 in the front-rear direction with respect to the front-rear movement guide block 76 as shown in FIG.

  The longitudinal guide block 76 is generally formed in a substantially square shape when viewed from above, and a long hole 79 is formed in the bottom wall in the left-right direction, and a pair of left and right side walls 80a, 80a and a front portion are formed on the four sides surrounding the bottom wall. A wall 80b and a rear wall 80c are projected. Leaf spring members 81 (see FIG. 8) that selectively engage with the concave and convex engaging portions 70a of the left and right guide walls 70 of the armrest base 65 are attached to the outer surfaces of the lower ends of the left and right side walls 80a, 80a. . A plurality of concave and convex engaging portions 80d are provided along the left-right direction on the rear surface of the front wall 80b. In addition, the rear wall 80c is inclined and protruded from the bottom wall to the upper rear side, and the cable 24 drawn upward from the opening 68 of the armrest base 65 has an allowable space 74 along the inclined lower surface of the rear wall 80c. It is drawn out in the direction.

  The left and right motion guide block 77 is formed in a rectangular shape when viewed from above, and a recess 82 for accommodating the rotation guide block 78 is formed at the center of the top surface, and the support boss 45 on the support base member 44 is formed at the center of the bottom surface. A cylindrical boss portion 83 that protrudes from the outer periphery and is slidably inserted into the long hole 79 of the longitudinal movement guide block 76 is provided. A leaf spring 84 that selectively engages with the concave and convex engaging portion 80 d of the front wall 80 b of the front and rear motion guide block 76 is attached to the front surface of the left and right motion guide block 77.

The rotation guide block 78 is provided with a plurality of concave and convex engaging portions 78a along a circumferential direction on a part of the outer peripheral surface. An engaging projection (not shown) urged by an elastic body is selectively engaged with the concavo-convex engaging portion 78a.
As described above, each element constituting the movement guide mechanism 18 can be stopped at an arbitrary movement position by the engagement by the concave and convex engaging portions 78a, 80d, and 70a.

  Further, as shown in FIGS. 8 to 10, a closing member 85 that closes the central opening 68 of the armrest base 65 from below is disposed below the armrest base 65. The blocking member 85 has a plate portion 85a having an outer size larger than that of the opening portion 68 and slidably contacting the lower surface of the armrest base 65, and a guide protrusion having a substantially rectangular shape in plan view, which protrudes from the center of the upper surface of the plate portion 85a. Part 85b.

  The width of the guide protrusion 85b in the left-right direction is set to be substantially the same as the width of the opening 68 in the left-right direction, and the guide protrusion 85b is inserted into the opening 68 so as to be slidable back and forth. . The guide protrusion 85b is formed with a long hole 86 extending in the left-right direction penetrating in the vertical direction. The closing member 85 is interposed between the support base member 44 and the armrest base 65 so that the support boss 45 on the support base member 44 penetrates the elongated hole 86 portion of the guide protrusion 85b in the vertical direction. . The closing member 85 sequentially sets the forward / backward movement guide block 76, the left / right movement guide block 77, and the rotation guide block 78 on the support boss 45 penetrating the long hole 86, and in this state, the rotation guide block 78 is supported by the support boss 45. By fastening and fixing to the armrest base 65, the armrest base 65 is held on the lower surface side. The closing member 85 can move integrally with the longitudinal movement guide block 76 across the opening 68 of the support base member 44.

  Further, a pull-in hole 87 for drawing the cable 24 continuous in the armrest column 15 into the opening 68 of the armrest base 65 is formed slightly behind the central long hole 86 on the closing member 85. ing. The pull-in hole 87 is formed in a long hole shape that is long in the left-right direction, and a part of the pull-in hole 87 extends over the guide protrusion 85 b of the closing member 85 (part of the guide protrusion 85 b is cut away).

  As shown in FIGS. 17 and 19, the operation cable 24 in this embodiment includes a cylindrical outer cable 24a and an inner cable 24b that is slidably held in the outer cable 24a. The outer cable 24a is fixed at an appropriate position in the routing route, and both end portions of the inner cable 24b are connected to the operation lever 67 side and the variable mechanism portion side in the support base 6. However, in this embodiment, the inner cable 24b is not directly connected to the operation lever 67, but is connected to the operation lever 67 via the stroke amplification mechanism 90 described in detail later using the amplification lever 88 and the movable pulley 89. Has been. Further, the outer cable 24 a is fixed to a place other than the allowable space 74 inside the armrest body 16. In this embodiment, the terminal portion of the outer cable 24 a on the armrest main body 16 side is fixed to the outer position of the guide wall 70 on the armrest base 65 via the locking tool 91. That is, in this embodiment, after the cable 24 drawn from the opening 68 is drawn in a loop shape in the allowable space 74, the front end side is drawn outside the guide wall 70, and the outer cable 24a is locked there. It is fixed on the armrest base 65 via a tool 91.

Further, the cable 24 in this embodiment has a first region a1 (see FIG. 5) inserted into the internal space of the armrest column 15 and a second region a2 (see FIG. 5) routed in the armrest main body 16. ) And the outer cable 24a are made of different materials and internal structures so that the bending rigidity differs. Specifically, the bending rigidity of the second region a2 arranged in the armrest main body 16 is set lower than the bending rigidity of the first region a1 arranged in the armrest column 15.
Thereby, when the armrest main body 16 is moved in the substantially horizontal direction, in the second region a2 used in a portion where the distance from the pull-in position from the opening 68 to the connection position with the operation lever 67, the pull-out direction, and the like change greatly, It is possible to obtain a flexible bending shape change in the armrest body 16, particularly in the allowable space 74. On the other hand, when the armrest main body 16 is moved up and down (when the armrest strut 15 is expanded and contracted), sufficient rigidity that is unlikely to be bent can be obtained in the first region a1 where it is desired to suppress the saddle-like bending in the armrest strut 15. it can.

  As shown in FIG. 5, a connecting member 92 that connects the outer cables 24a in both areas is integrally attached to the boundary between the first area a1 and the second area a2 of the cable 24. The connecting member 92 located at the boundary between the first region a1 and the second region a2 is attached to the top wall block 39 at the upper end of one inner cylinder member 35A.

FIG. 21 is a view showing a cross section of the upper end of one inner cylinder member 35A of the connecting member 92, and FIG. 22 is a view showing a state of the inner cylinder member 35A in a top view. FIG. 23 is a view showing the holding member 43 that holds the connecting member 92.
As shown in these drawings, the connecting member 92 is provided with a pair of protrusions 92a and 92a extending in a direction orthogonal to the axial direction. On the other hand, the holding member 43 is provided with a substantially U-shaped holding groove 43a that holds the outer peripheral surface of the connecting member 92, and an engaging groove 43b that locks the pair of protrusions 92a and 92a of the connecting member 92. 43b is provided on the inner wall of the holding groove 43a. The connecting member 92 and the cable 24 are integrated with the holding member 43 so that the pair of protrusions 92a and 92a are engaged with the engaging grooves 43b and 43b so that the connecting member 92 and the cable 24 cannot move up and down. In this embodiment, the connecting member 92 and the holding member 43 constitute a locking member.

Further, the front end surface of the holding member 43 is provided with an inclined surface 43c that is inclined so that the front-rear width is narrowed downward, and a pair of locking projections 43d and 43d are provided at the lower end of the inclined surface 43c. Has been. A protruding piece 93 protruding upward is provided on the rear side of the holding member 43, and a locking protrusion 93 a protruding rearward is integrally provided on the protruding piece 93.
The cable insertion hole 42 of the inner cylinder member 35A to which the holding member 43 is attached is provided with an inclined surface 42a with which the inclined surface 43c of the holding member 43 abuts. The inclined surface 42a is inclined so that the cable insertion hole 42 is narrowed downward. The inclined surface 42 a constitutes a regulating surface that regulates the downward displacement of the connecting member 92 and the holding member 43. Further, in the vicinity of the lower end of the inclined surface 42a, engaging grooves 42b and 42b (see FIG. 22) for engaging the pair of locking protrusions 43d and 43d of the holding member 43 are provided, and the cable insertion hole 42 is provided. A locking hole 94 into which a locking protrusion 93a on the holding member 43 side is fitted is provided on the rear upper side wall. The holding member 43 holding the cable 24 and the connecting member 92 is inserted into the cable insertion hole 42, and the locking projections 43d, 43d, and 93a are engaged with corresponding portions on the cable insertion hole 42 side, thereby causing the inner cylinder member 35A. Fixed to.
In this embodiment, the connecting member 92, the holding member 43, and the cable insertion hole 42 constitute positioning means for positioning the vicinity of the boundary between the first region a1 and the second region a2 of the cable 24 in the vertical direction. Yes.

  As described above, the cable 24 locked to the upper part of the inner cylinder member 35A via the connecting member 92 and the holding member 43 has the first region a1 drawn out to the inside of the elevating cylinder 15B, and the end cap of the column body 15A. After being inserted into the 28 cable insertion grooves 30, as shown in FIG. 15, the cable routing grooves 22 on the support base 19 are routed.

Here, the stroke amplification mechanism 90 of the operation lever 67 provided in the armrest main body 16 will be described with reference to FIGS.
The stroke amplifying mechanism 90 includes an amplifying lever 88 that is pivotally supported on a front flat surface 95 between the opening 69 on the armrest base 65 and the connecting rib 71 so as to be rotatable in the horizontal direction, and a support shaft 67a of the operation lever 67. A movable pulley 89 rotatably provided at a position away from the arm, a connecting wire 96 having one end connected to the armrest base 65 and the other end connected to the amplifying lever 88 and an intermediate portion wound around the moving pulley 89; It is equipped with.

  The amplification lever 88 is disposed on the front flat surface 95 along the left-right direction, and one end portion extending in the left-right direction is rotatably supported on the front flat surface 95 by the pivot 88a and the other end. An output portion 88b to which the end portion of the inner cable 24b is connected is provided at the portion. In addition, an input portion 88 c to which the other end of the connecting wire 96 is connected is provided at the center in the left-right direction of the amplification lever 88. Accordingly, the stroke input to the input portion 88c of the amplification lever 88 is amplified to a ratio corresponding to the lever ratio of the amplification lever 88, and the inner cable 24b is caused to stroke.

On the rear edge of the opening 69 on the armrest base 65, a partition wall 97 protruding downward is extended. As shown in FIG. 10, the partition wall 97 isolates the lock release lever 37 disposed on the upper front end side of the armrest column 15 from the operation lever 67 held by the armrest base 65. One end of the connecting wire 96 is connected to a substantially central position in the vertical direction of the partition wall 97.
The rear surface on the base portion side of the partition wall 97 abuts on the front end portion 85d of the closing member 85 when the armrest main body 16 is retracted to the maximum with respect to the armrest support column 15, thereby causing excessive displacement of the armrest main body 16. Be regulated. Thereby, a sufficient gap d is secured between the partition wall 97 and the lock release lever 37 so as not to hinder the operation of the lock release lever 37.

  The operation lever 67 includes an operation portion 67b having a substantially T-shaped cross section disposed on the lower side of the opening 68, and a support shaft 67a that is supported on the armrest base 65 so as to be rotatable on the upper side of the opening 68. The operating portion 67b and the arm portion 67c for connecting the support shaft 67a are provided, and the movable pulley 89 is rotatably supported at a substantially middle portion of the arm portion 67c. The operation lever 67 is urged in a direction in which the operation portion 67b is positioned at the lowermost end by an urging spring (not shown).

In the initial state in which the operation lever 67 is not operated, as shown in FIGS. 17 and 18, the moving pulley 89 is located in the retracted position, and the amplification linked to the operating lever 67 via the moving pulley 89 and the connecting wire 96 is performed. The lever 88 is stopped at a rotation angle at which the output portion 88b is at the last retracted position.
When the operating lever 67 is pushed up from this state by the seated person, the movable pulley 89 moves forward as shown in FIGS. Moves forward a distance twice that of the moving pulley 89. Thus, when the amplification lever 88 rotates, the amplification lever 88 draws the inner cable 24b with a stroke amplified to a ratio corresponding to the lever ratio.

The chair 1 of this embodiment configured as described above has a cable 24 routed in the armrest main body 16 between a position where the armrest base 65 is pulled in from the opening 68 and a position where the operation lever 67 is connected. In FIG. 27, since the curved bending portion 75 that curves in a substantially horizontal direction is provided, as shown in FIG. 27, the armrest body 16 (armrest base 65) can be variously arranged in the front-rear direction, the left-right direction, and the rotation direction. Even in the case of moving in combination, the bending bending portion 75 flexibly follows the movement and changes the bending form. For this reason, when the armrest main body 16 is moved in the substantially horizontal direction, the cable 24 is stretched to hinder the smooth operation of the armrest main body 16, or the cable 24 is slidably contacted with surrounding members to be worn out. There is no.
In addition, (A), (B), and (C) in the upper part of FIG. 27 show a state in which the armrest body 16 is retracted, and (A) of them moves to the left and rotates counterclockwise. (B) shows a state in which neither lateral movement nor rotation is performed, and (A) shows a state in which it is moved to the right and rotated clockwise. In addition, (D), (E), and (F) in the lower part of FIG. 27 show a state in which the armrest body 16 is advanced, and (D) of them moves to the left and rotates counterclockwise. (E) shows a state in which neither lateral movement nor rotation is performed, and (F) shows a state in which it is moved to the right and rotated clockwise.

  In the chair 1 of this embodiment, an allowable space 74 that allows a change in the bending form of the bending portion 75 of the cable 24 between the lower armrest base 65 constituting the armrest body 16 and the upper cover member 66 is allowed. Therefore, it is possible to effectively prevent the cable 24 from interfering with surrounding members when the armrest body 16 is moved in the substantially horizontal direction. In particular, in this embodiment, since the permissible space 74 is formed between the armrest base 65 that is the lower layer member and the cover member 66 that is the upper layer member, the permissible space 74 is ensured sufficiently wide and the flexure is bent. The loop length of the part 75 can be enlarged. Therefore, the movement amount of the armrest main body 16 relative to the armrest strut 15 can be secured sufficiently large without causing interference with members around the cable 24. In this embodiment, since the allowable space 74 is surrounded by the arc-shaped wall, the contact resistance can be reduced even if the cable 24 temporarily contacts the wall.

Further, in the chair 1 of this embodiment, a movement guide mechanism 18 for moving the armrest main body 16 in a substantially horizontal direction is provided above the opening 68 of the armrest main body 16, and from the opening 68 in a substantially horizontal direction. An allowable space 74 in which the curved bending portion 75 is accommodated is provided at a position spaced apart from each other, and the cable 24 drawn into the armrest body 16 from the opening 68 is routed from below the movement guide mechanism 18 toward the allowable space 74. Therefore, even when the movement guide mechanism 18 operates with a complicated movement when the armrest main body 16 moves in a substantially horizontal direction, the cable 24 does not hinder the operation. Therefore, in this chair 1, smooth movement in the substantially horizontal direction of the armrest main body 16 can be always obtained.
In particular, in this embodiment, since the rear wall 80c of the longitudinal movement guide block 76 positioned immediately above the opening 68 is inclined obliquely upward and rearward, the longitudinal movement guide block 76 with respect to the cable 24. Can be reliably prevented from contacting at the edge portion.

  Further, the chair 1 of this embodiment includes a cylindrical outer cable 24a, and an inner cable 24b that is slidably held in the cable 24 for operating the variable mechanism on the chair body 11 side, And both ends of the inner cable 24b are connected to the operation lever 67 side and the variable mechanism portion side, and a part of the outer cable 24a is fixed to a place other than the allowable space 74 in the armrest body 16. Therefore, the entire cable 24 does not move greatly in the armrest body 16 and does not hinder the smooth movement of the armrest body 16 in the substantially horizontal direction.

  Furthermore, in this embodiment, since the stroke amplification mechanism 90 that increases the operation stroke by the operation lever 67 is interposed between the inner cable 24b and the operation lever 67, the curved bending portion 75 of the cable 24 is enlarged. Even if it is a case, the variable mechanism part by the side of the chair main body 11 can be reliably operated with sufficient stroke.

  In particular, in the chair 1 of this embodiment, the moving pulley 89 that transmits force via the connecting wire 96 is used as a part of the stroke amplification mechanism 90, and therefore, the front end portion of the armrest base 65 on which the operation lever 67 is installed. However, the operation stroke of the operation lever 67 can be reliably amplified in spite of being a narrow and complicated part.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 1 Chair 5 Seat 11 Chair main body 15 Armrest support | pillar 16 Armrest main body 18 Movement guide mechanism 24 Cable 24a Outer cable 24b Inner cable 65 Armrest base (lower layer member)
66 Cover member (upper layer member)
67 Operation lever (movable operation part)
68 Opening portion 74 Allowable space 75 Curved deflection portion 89 Moving pulley 90 Stroke amplification mechanism

Claims (7)

A chair body having a seat for sitting and a variable mechanism;
An armrest strut standing upward on the side of the seat body of the chair body;
An armrest body supported on the upper portion of the armrest strut so as to be movable in a direction crossing the vertical direction;
A movable operation unit that is attached to the armrest body and remotely operates the variable mechanism unit of the chair body;
A cable that connects the movable operation unit and the variable mechanism unit in an interlockable manner,
The bottom of the armrest body is provided with an opening for drawing the cable, one end of which is connected to the variable mechanism, into the armrest body.
The armrest body is bent in a loop shape in a direction intersecting with the vertical direction in the armrest body between the drawing position of the cable from the opening and the connection position with the movable operation section. A chair provided with a bending portion whose bending form changes with movement in a direction intersecting with the vertical direction of the chair.   The chair according to claim 1, wherein the armrest body is provided with an allowable space that allows a change in a bending shape of the bending portion of the cable.   The armrest main body includes a lower layer member having the opening and an upper layer member attached to an upper portion of the lower layer member, and the allowable space is formed between the lower layer member and the upper layer member. The chair according to claim 2. A movement guide mechanism for moving the armrest body relative to the armrest column in a direction intersecting the vertical direction is provided above the opening in the armrest body,
The permissible space is provided at a position spaced apart from the opening in the armrest body in a direction intersecting the vertical direction,
The chair according to claim 2 or 3, wherein a cable drawn into the armrest main body from the opening is drawn in a direction of the allowable space from below the movement guide mechanism. The cable includes a cylindrical outer cable, and an inner cable that is slidably held in the outer cable.
Both end portions of the inner cable are connected to the variable mechanism portion and the movable operation portion, and a part of the outer cable is fixed to a place other than the allowable space in the armrest body. The chair according to any one of claims 1 to 4.   The chair according to claim 5, wherein a stroke amplification mechanism for amplifying an operation stroke of the movable operation unit is interposed between one end of the inner cable and the movable operation unit.   The chair according to claim 6, wherein the stroke amplification mechanism includes a moving pulley at least in part.

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