JP7375428B2 - Chair - Google Patents

Description

The present invention relates to a chair suitably used in offices and the like.

2. Description of the Related Art Conventionally, there has been known a chair in which a seat having a seat frame is rotatably supported by a link member disposed on a back frame (for example, see Patent Document 1).

Many chairs of this type do not have a shell-like member on the underside of the seat to which an armrest can be attached. Therefore, when armrests are provided, they are usually attached to a support base, a backrest body, or a back frame.

However, with such a configuration, not only is the support base, backrest body, and back frame required to have appropriate strength in order to provide the armrests, but also the entire armrest must be strong enough to place the armrests in the desired position. There was a problem in that the size was likely to increase.

In other words, conventional chairs have not been able to support the armrests at suitable positions that have excellent strength and can prevent the armrests from increasing in size.

JP2016-83114A

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a chair that has excellent strength and can support armrests at suitable positions that can prevent the armrests from increasing in size.

That is, the present invention has the following configuration.

The invention according to claim 1 is a chair comprising a seat having a seat frame, and a bridge frame extending in the left-right direction, disposed under the seat, and capable of rotatably supporting the seat frame. The bridge frame is provided with an armrest attachment part to which an armrest can be attached, and constitutes a support body rotatably supported in the front-rear direction with respect to a support base attached to the upper end of the leg, The body is provided with a backrest attachment part to which a backrest can be attached, and the armrest attachment part, the bridge frame, and left and right side frames extending rearward from both left and right sides of the bridge frame, The chair includes a rear frame that connects the rear end portions of these left and right side frames, and the backrest attachment portion is provided on the outer side of the left and right side frames and the rear frame.
The invention according to claim 2 is a chair comprising a seat having a seat frame, and a bridge frame that extends in the left-right direction and is disposed below the seat and can rotatably support the seat frame. The bridge frame includes an armrest attachment portion to which an armrest can be attached, and the bridge frame includes a bridge frame body that is curved downwardly in a front view, and the bridge frame body. The chair is provided with a main shaft holding part that protrudes downward from the center part in the left-right direction and can hold the main shaft disposed on the support base.

The invention according to claim 3 is the chair according to claim 1 or 2 , wherein the armrest attachment portions are arranged at both end portions of the bridge frame.

The invention according to claim 4 is a claim in which the armrest mounting portion is provided with a recess that is open to the outside, and a base end portion of the armrest or a cover material can fit into the recess. This is the chair described in item 3 .

The invention according to claim 5 is the chair according to claim 1, 2 , 3 , or 4 , wherein the bridge frame holds seat support shafts that pivotally support the seat on both sides.

In the invention according to claim 6 , the bridge frame is rotatably supported in the front-rear direction via a main shaft with respect to a support base attached to an upper end of the leg, and when viewed from a side, the bridge frame 6. The chair according to claim 5 , wherein the support shaft is positioned in front of the main shaft.

As explained above, according to the present invention, it is possible to provide a chair that has excellent strength and can support armrests at suitable positions that can prevent the armrests from increasing in size.

FIG. 1 is a perspective view showing an embodiment of the present invention. The front view in the same embodiment. The back view in the same embodiment. The left side view in the same embodiment. The right side view in the same embodiment. FIG. 3 is a plan view of the same embodiment. The bottom view in the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. The exploded right side view in the same embodiment. FIG. 3 is a rear view of the same embodiment with the backrest removed. FIG. 3 is a partially enlarged front view of the backrest in the same embodiment. FIG. 5 is a sectional view taken along line XX in FIG. 4. FIG. 3 is a sectional view taken along the YY line in FIG. 2. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is a plan view of the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is a plan view of the same embodiment. FIG. 3 is a partially enlarged perspective view of the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is an exploded perspective view of the same embodiment. FIG. 3 is a partially enlarged perspective view of the same embodiment. The enlarged left side view of the support base in the same embodiment. The enlarged right side view of the support base in the same embodiment.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 27.

In this embodiment, the present invention is applied to a rotary office chair (hereinafter simply referred to as a "chair") that is suitably used in an office or the like.

The chair includes legs A, a support base B attached to the upper end of the legs A, a support C rotatably supported in the front-rear direction with respect to the support base B, and a front portion of the chair with respect to the support base B. It includes a seat D which is rotatably supported and whose rear portion is rotatably supported with respect to a support C, a backrest E supported by the support C, and an armrest F supported by the support C. It is something.

The chair has a backrest E, a seat D, and an armrest F that can be moved between a normal posture, which is an unloaded posture, and a backward tilted posture (not shown), which is a posture tilted further back than the normal posture. A locking mechanism Rc is provided, which is configured to obtain the same.

Each configuration of the chair will be described in detail below.

<<Leg A>>
The leg A includes a plurality of leg blades a1 having casters a11 at their tips and arranged radially, and a leg support a2 erected at the base end of the leg blades a1.

A gas spring a3 that can be expanded and contracted in the vertical direction is provided inside the leg support a2. The leg support a2 is configured to be expandable and retractable in the vertical direction by a gas spring a3, so that the vertical position of the support base B attached to the upper end can be changed to an appropriate position.

<<Support base B>>
The support base B is supported by the legs A and is configured to be pivotable. The support base B includes a support base main body 1 fixed to the upper end of the leg strut a2, and a link member 2 rotatably supported at the front end of the support base main body 1 via a rear link shaft j3, which is a rear shaft. It is prepared.

<Support base body 1>
The support base main body 1 has a box shape that extends in the front-rear direction and defines a reaction spring installation space in which a reaction spring 13 can be installed. A cylindrical leg connection part 11 is provided at the rear of the support base main body 1 to which the upper end of the gas spring a3 is connected.

The support base main body 1 is provided with a main shaft j1 for rotatably supporting the support body C. That is, at the rear of the support base main body 1, a pair of left and right main shaft support parts 12 that can support both ends of the main shaft j1 extending in the left and right direction are provided to protrude upward.

The reaction spring 13 is interposed between the support base B and the support C. By urging the support C, the reaction spring 13 generates a reaction force that allows the backrest E and the seat D to return to their normal positions. The reaction spring 13 has a front end that engages with a rear link shaft j3 that connects the support base body 1 and the link member 2 via a cam member 13d, and a rear end that is arranged on the lower end of the support body C. It is rotatably connected to the pressed shaft j5.

Note that the rear link shaft j3 also serves as the rotation axis j7 of the reaction force operating lever 14 that can operate the reaction force spring 13. Further, the pressed shaft j5 is held by a pair of holding arms 42 extending downward and forward from the main shaft support portion 12.

The reaction force operating lever 14 includes a lever main body 141 exposed outside the support base main body 1 and a rotating shaft j7 integrally attached to the lever main body 141.

A cam member 13d is provided on the rotating shaft j7, with which the tip of the reaction force adjustment pin 13c of the reaction force spring 13 directly engages. The reaction force adjustment pin 13c constitutes the axis of the reaction force spring 13. The reaction force adjustment pin 13c is configured to be able to protrude and retract from a front mount portion 13b disposed at the front end of the spring body 13a of the reaction force spring 13. By rotating the reaction force operating lever 14, the cam member 13d is rotated, and the reaction force adjustment pin 13c is projected and retracted, thereby making it possible to change the elastic repulsion force of the reaction spring 13.

In this embodiment, the reaction force operating lever 14 can be rotated to take three positions in which the engagement between the cam member 13d and the reaction force adjustment pin 13c can be changed.

That is, the chair has three postures with the reaction force operating lever 14, so that the backrest E and the seat D have a backward tilting lock state in which the backrest E and the seat D do not tilt backward, and the backrest E and the seat D have a relatively strong reaction force. A state in which the backrest E and the seat D can be tilted backward with a relatively weak reaction force (not shown), and a state in which the backrest E and seat D can be tilted backward with a relatively weak reaction force (not shown). ) and can be selected.

<Link member 2>
The link member 2 is configured to be rotatable with respect to the support base body 1. That is, the link member 2 has a normal position extending in the longitudinal direction that substantially coincides with the longitudinal direction of the support base main body 1 when viewed from the side, and a forward end portion that is linked to the backward tilting movement of the backrest E and the seat D and is lower than the normal position. It is rotatably supported with respect to the support base main body 1 between an upright position (not shown) in which the support base body 1 is moved upward.

The link member 2 has a proximal end pivotally attached to the support base main body 1 and a distal end pivotally attached to the seat frame S. The front part of the link member 2 is connected to the seat D via a front link shaft j2, which is a front shaft, and the rear part of the link member 2 is connected to the support base main body 1 via a rear link shaft j3. The rear end edge and front end edge of the link member 2 have a partially circular shape in side view. Both sides of the front edge of the support base main body 1 are recessed into a partially circular shape to match the shape of the rear edge of the link member 2.

The link member 2 is configured so that both ends of the front link shaft j2 extending in the left-right direction and one end of the rear link shaft j3 (the opposite side to the end to which the lever body 141 is attached) are not exposed to the outside. . Specifically, the link member 2 supports both ends of the front link shaft j2 by a left link member 2a and a right link member 2b, which are divided into left and right halves and have a substantially half-shape.

The support base B having the above configuration has a suitable appearance that can give a neat impression to the user by the support base main body 1 and the link member 2.

That is, as shown in FIGS. 26 and 27, the support base main body 1 includes a first upper edge portion u1 and a first lower edge portion U1, which form a straight line and are configured to gradually move away from each other toward the rear in side view. It has an edge s1. Similarly, the link member 2 includes a second upper edge u2 and a second lower edge s2, which are straight lines that are configured to gradually move away from each other toward the rear in side view.

The support base B has a first virtual intermediate line c1 located between the first upper edge u1 and the first lower edge s1 in the support base main body 1, and a second upper edge u2 in the link member 2 in the normal posture. The relative positions of the support base main body 1 and the link member 2 are set so that the second virtual intermediate line c2 located between the second lower edge portion s2 and the second virtual intermediate line c2 are located on the same straight line.

Further, the support base B is configured such that the left and right outer surfaces 15 of the support base main body 1 and the left and right outer surfaces 21 of the link member 2 are substantially flush with each other.

Furthermore, the support base B has an upper surface portion 16 corresponding to the first upper edge u1 of the support base body 1 and an upper surface portion 22 corresponding to the second upper edge u2 of the link member 2 in the normal posture. It is set to be the same. Similarly, the support base B has a lower surface portion 17 corresponding to the first lower edge s1 of the support base main body 1, and a lower surface portion 23 corresponding to the second lower edge s2 of the link member 2 in the normal posture. are set so that they are approximately flush.

In addition, as shown in FIG. 7, the chair extends in the front-rear direction by the outer edge of the support base main body 1, the outer edge of the link member 2, and the outer edge of the front shaft holding part 6 that constitutes the seat frame S. It has a substantially rectangular outline.

<<Support C>>
The support C is capable of supporting the seat D in cooperation with the support base B. The support C is interposed between the support base B and the backrest E, and also between the support base B and the armrest F. In other words, the support C can support the backrest E and the seat D. The support body C is provided with backrest attachment parts k1 and L1 to which the backrest E can be attached, and an armrest attachment part 32 to which the armrest F can be attached. The support body C is set so that the entire support body C takes a posture tilted forward with respect to the horizontal in the normal posture.

The support body C includes a rear bridge frame J which is a first bridge frame having a portion extending in the left-right direction, left and right side frames K extending rearward from both left and right sides of the rear bridge frame J, and left and right side frames K. It is provided with a rear frame L that connects the rear end portions of the side frames K. The support C has a continuous annular frame portion w1.

In this embodiment, the rear bridge frame J, the left and right side frames K, and the rear frame L are integrally formed of metal. The support C is rotatably supported in the front-rear direction via a main shaft j1 at the rear of a support base B attached to the upper end of the leg A. The support C can rotatably support the seat frame S disposed on the support C in the front-rear direction.

<Rear bridge frame J>
The rear bridge frame J is arranged under the seat D. The rear bridge frame J includes a rear bridge frame main body 3, which is a first bridge frame main body, which is curved downward in a convex manner when viewed from the front, and a rear bridge frame main body 3 that protrudes downward from a left-right center portion of the rear bridge frame main body 3. The spindle holding part 4 is capable of holding the main spindle j1 supported by the support base B.

[Rear bridge frame body 3]
The rear bridge frame body 3 is elongated in the left-right direction, and its left-right width dimension is set to be approximately the same as the left-right width dimension of the seat frame body M. The rear bridge frame main body 3 has the form of a band-shaped plate material extending in the left-right direction as a whole and curved so that the middle part is located below both ends. In other words, the rear bridge frame main body 3 has an inverted arch shape when viewed from the front.

The rear bridge frame main body 3 is set so that its upper surface faces diagonally upward when the support body C takes a normal attitude. That is, the rear bridge frame main body 3 is configured such that when the backrest E is tilted rearward, the portion that supports the seat support shaft j4 can be positioned above the main shaft j1 than when in the normal posture.

The rear bridge frame main body 3 is located inside the frame-shaped portion w2 of the seat frame main body M in a plan view, and has a main body central portion 3a having substantially the same thickness in the left-right direction, and a main body central portion 3a. The main body has both end portions 3b extending outward from both ends and having a larger longitudinal width and thickness than the central portion 3a of the main body.

The rear bridge frame main body 3 as a whole has a curved shape convex downward, but in addition, the upper part of the main body central portion 3a is recessed below the main body both end portions 3b. , the space sp that can allow downward deflection of the seat body P is expanded.

The main body central portion 3a has a main shaft holding portion 4 integrally projecting downward from the middle portion in the left-right direction.

The rear bridge frame main body 3 is configured to rotatably support the seat frame S via a seat support shaft j4 at both left and right ends. That is, the rear bridge frame main body 3 is provided with first shaft holders 31 that protrude upward on both left and right sides, and a seat support shaft j4 that pivotally supports the seat D is attached to each shaft holder 31. I'm keeping it.

In other words, the first shaft holding portions 31 that can rotatably support the seat D via the seat support shaft j4 are raised on both end portions 3b of the main body. In addition, the seat support shaft j4 is set to be located above the main shaft j1 and in front of the main shaft j1 in a side view so that the seat support shaft j4 can constitute a weight-sensing locking mechanism Rc.

The rear bridge frame main body 3 includes armrest attachment portions 32 at both ends to which armrests F can be attached. The armrest attachment part 32 is provided with a recess b1 open to the outside, and the base end part f21 of the armrest F or the cover material G can be fitted into the recess b1. The armrest attachment portions 32 are formed at both end portions 3b of the rear bridge frame body 3.

The recess b1 is composed of an upper wall b12, a lower wall b13, a front wall b14, a rear wall b15, and a back wall b16, and an insertion space b11 surrounded by these is formed. The base end f21 of the armrest F is inserted into the insertion space b11, and the base end f21 of the armrest F is fitted into the recess b1. A guide recess b17 extending in the insertion/removal direction of the base end f21 of the armrest F and nut parts n1 provided on both sides of the guide recess b17 are provided on the inner surface side of the upper wall b12.

The guide recess b17 engages with a positioning protrusion f22 provided on the base end f21 of the armrest F to position the base end f21 of the armrest F. The armrest F is attached to the support body C by inserting a screw v1 into a screw insertion hole h1 provided in a base end f21 of the armrest F, and then screwing the screw v1 into a nut portion n1.

In addition, when the armrest F is not attached to the chair of this embodiment, as shown in FIG. 20, in order to prevent the recess b1 from being exposed to the outside, the cover material G is fitted into the recess b1. It is now possible to do so.

[Spindle holding part 4]
The main shaft holding portion 4 is configured to protrude downward from the center in the left-right direction of the rear bridge frame main body 3 and can hold the main shaft j1 disposed on the support base B.

The spindle holding portion 4 is provided with a spindle insertion hole 41 extending in the left-right direction for holding the spindle j1. The main shaft holding portion 4 is set to a size that allows it to be disposed between the main shaft supporting portions 12 provided on the support base B in pairs on the left and right in the form of upright walls.

The main shaft holding portion 4 has a pair of holding arms 42 extending from side to side toward the front and lower side at a position below the main shaft insertion hole 41 . A pressed shaft j5 to which the rear end of the reaction spring 13 is connected is supported between the distal ends of the holding arms 42. That is, the support body C is set so that the pressed shaft j5 located below the main shaft j1 is pressed rearward by the reaction force spring 13, so that it can assume a normal posture in an unloaded state.

<Left and right side frames K>
The left and right side frames K extend rearward in a substantially straight line from the inner side of both end portions 3b of the rear bridge frame body 3. The left and right side frames K are provided with backrest attachment portions k1 to which the backrest E is attached to the left and right outer portions.

The backrest attachment part k1 provided on the left and right side frames K has a fitting part that is internally fitted into the backrest E, and a screw v2 screwed into the backrest E that penetrates in the left-right direction. A screw insertion hole h2 is provided. More specifically, the fitting part of the backrest attachment part k1 is mainly composed of a positioning protrusion k11 that projects outward from the vertically intermediate part of the outer part of the left and right side frames K. There is.

<Rear frame L>
The rear frame L spans between the rear end portions of the left and right side frames K. The rear frame L has a generally curved shape convex toward the rear. The rear frame L is provided with a backrest attachment part L1 on the outer side, that is, the rear part, to which the backrest E is attached.

The backrest mounting portion L1 provided on the rear frame L includes a fitting portion that is internally fitted into the backrest E, and a screw penetrating in the front-rear direction through which the screw v3 screwed into the backrest E is inserted. It has an insertion hole h3. More specifically, the fitting part of the backrest attachment part L1 is mainly composed of a positioning protrusion L11 that projects outward from a vertically intermediate part of the outer part of the rear frame L.

<Annular frame part w1>
The support body C includes an annular frame portion w1 having a fitting portion that can fit into the connecting portion 8 of the backrest main body Q. The annular frame portion w1 is constituted by an annularly continuous frame-shaped portion.

Specifically, the annular frame portion w1 is composed of a rear bridge frame J, left and right side frames K, and a rear frame L. The annular frame portion w1 has a substantially square shape in plan view. Fitting portions that can be fitted with the backrest E are provided on the outer side portions of the left and right side frames K that constitute the annular frame portion w1, and on the rear side portion of the rear frame L.

The fitting parts provided on the outer sides of the left and right side frames K and the rear frame L are mainly composed of positioning protrusions k11 and L11 that are fitted into the backrest E.

In addition, as shown in FIG. 18, in order to suitably secure the downward bending allowance of the seat body P, this chair has a space w2s surrounded by the frame-shaped portion w2 of the seat frame body M in plan view, and a support. The positions of the seat frame S and the support body C are set so that the space w1s surrounded by the annular frame portion w1 of C overlaps.

Further, the annular frame portion w1 is set so as to take an attitude tilted forward as a whole with respect to the horizontal in the normal attitude.

<<Location D>>
The seat D includes a seat frame S that includes a frame-shaped member that is continuous in an annular shape, and a seat body P that is attached to the seat frame S and has a seating surface.

<Seat frame S>
The seat frame S includes a seat frame main body M having a frame shape, and a front bridge frame T that is a second bridge frame provided in a bridge shape that connects both left and right ends of the seat frame main body M. The seat frame body M and the front bridge frame T are integrally formed of synthetic resin. The seat frame S has an annular continuous frame portion w2.

[Seat frame body M]
The seat frame main body M constitutes a frame-shaped portion w2 that is continuous in an annular shape, and specifically has a substantially rectangular frame shape in plan view. The seat frame main body M can support the peripheral edge of the seat main body P from below.

The seat frame body M includes left and right seat frame parts m1 extending in the front-rear direction, a seat front frame part m2 that connects the front ends of the left and right seat frame parts m1, and the rear of the left and right seat frame parts m1. It is provided with a seat rear frame part m3 that connects the end parts. In other words, the seat frame main body M includes a frame portion w2 that is continuously formed into a rectangular ring shape by the left and right seat side frame portions m1, the seat front frame portion m2, and the seat back frame portion m3.

The seat frame main body M is supported from below by a rear bridge frame J that constitutes a support body C and a front bridge frame T that is integral with the seat frame main body M. The seat frame body M is provided with a plurality of screw insertion holes h4 extending vertically through which screws v4 screwed into the seat body P are inserted. A plurality of ribs rv are provided on the upper surface side of the seat frame main body M along the longitudinal direction.

The left and right seat-side frame portions m1 extend substantially linearly in the front-rear direction. A second shaft holding portion m11 that can hold the seat support shaft j4 is provided on the left and right seat side frame portions m1 to protrude downward from the inner edge of the rear portion. In other words, the seat support shaft j4 is held by the second shaft holding part m11 provided on the seat frame S and the first shaft holding part 31 provided on the support body C, so that the seat frame S moves forward and backward with respect to the support body C. It can be rotated in any direction.

The seat frame portion m2 extends substantially linearly in the left-right direction. The seat rear frame portion m3 has a generally curved shape convex toward the rear.

[Front bridge frame T]
The front bridge frame T extends in the left-right direction and can support the seat frame main body M from below. The front bridge frame T is supported at the front part of the support base B so as to be rotatable in the front-rear direction with respect to the support base B.

The front bridge frame T includes a front bridge frame main body 5, which is a second bridge frame main body, having a curved portion 5a convexly curved downward in a front view, and a front bridge frame main body 5 having a curved portion 5a convexly curved downward in a front view, and a front bridge frame main body 5 which is a second bridge frame main body having a curved portion 5a convexly curved downward in a front view. This includes a front shaft holding portion 6 which is capable of holding a front link shaft j2, which is a front shaft, which is provided on the support base B and protrudes downward from the support base portion B.

On the left side of the front bridge frame T, an operating lever V for raising and lowering the seat that can raise and lower the seat D with respect to the leg A is disposed.

(Front bridge frame body 5)
The front bridge frame body 5 includes a curved portion 5a that is curved downward to form a convex shape when viewed from the front, and an upper end that extends upward from both left and right ends of the curved portion 5a. It is provided with left and right upright walls 5b and 5c connected to the seat side frame part m1.

The front bridge frame main body 5 is provided with an operating lever support portion 51 that can support an operating lever V for raising and lowering the seat.

The curved portion 5a has an inverted arch shape when viewed from the front. The curved portion 5a extends substantially linearly in the left-right direction in plan view and bottom view. The curved portion 5a extends in the left-right direction and has substantially the same thickness when viewed from the front.

The left and right standing walls 5b and 5c connect the seat frame main body M and the curved portion 5a. The upper end portions of the left and right upright walls 5b and 5c are connected to the front end portions of the left and right seat side frame portions m1. In this embodiment, the operating lever V is arranged on the left standing wall 5b. The width dimension of the left standing wall 5b in the front-back direction is set larger than the width dimension of the right standing wall 5c in the front-back direction.

The left standing wall 5b is provided with a rectangular through hole 5d that penetrates in the left-right direction. An operating lever holding member Z capable of rotatably supporting the operating lever V is attached to the inner surface of the left standing wall 5b.

The operating lever V is supported by the operating lever support portion 51. The operating lever V has an operating end tn that projects outward through a through hole 5d formed in the left upright wall 5b, and an operating end tn that projects from the base end va and extends forward and backward that is pivotally supported by the lever holding member Z. The lever shaft j6 includes a lever shaft j6 and a wire support portion ws disposed below the lever shaft j6 at the base end va. The wire support part ws can support the end part wyt of the wire wy that transmits the operating force to the gas spring a3 provided on the leg A.

The operating lever support section 51 includes a lever holding member Z that is attached to the inner surface of the left standing wall 5b and the left end of the curved portion 5a and can support the operating end tn of the operating lever V in a vertically rotatable manner. We are prepared.

The lever holding member Z includes a shaft support part z1 that can rotatably support a lever shaft j6 disposed at the base end va of the operating lever V, a wire communication path z2 that communicates the wire wy in the left-right direction, and an inner part. a screw insertion hole h5 into which a screw v5 is inserted, which is bored in the curved portion 5a, and a screw v6, which is bored in the outer side and screwed into the upper part of the left standing wall 5b, is inserted. It has an insertion hole h6. A housing space za that can accommodate the base end va of the operating lever V is formed in the lever holding member Z.

When the operating end tn of the operating lever V is moved upward by the user's finger operation, the end wyt of the wire wy supported by the wire support ws is pulled toward the operating end tn. The wire wy actuated by the operating lever V rotates the push-down member ps pivotally supported on the rear end of the support base B, and the push-down member ps can press the operating pin of the gas spring a3 downward. ing.

In this embodiment, the wire wy that can be actuated by the operating lever V is provided so as to be positioned above the curved portion 5a of the front bridge frame T and the support base B, so that it is less noticeable from the outside.

(Front shaft holding part 6)
The front shaft holding portion 6 is provided so as to hang downward from the center portion in the left-right direction of the curved portion 5a. The front shaft holding portion 6 is provided with a shaft insertion hole 61 extending in the left-right direction.

The front link shaft j2 is inserted into the shaft insertion hole 61 of the front shaft holding portion 6, and both ends thereof are held between the left link member 2a and the right link member 2b of the link member 2. That is, the front shaft holding portion 6 is disposed on the left link member 2a and the right link member 2b. In other words, the left and right width dimensions of the front shaft holding portion 6 are set smaller than the left and right width dimensions of the link member 2.

<Seat body P>
The seat body P includes a seat intermediate frame p1 disposed on the seat frame body M, a seat cushion p2 disposed on the seat intermediate frame p1, and the upper surface of the seat intermediate frame p1 and the seat cushion p2. It is provided with upholstery p3 which is an exterior material covering the sides and side surfaces.

The seat intermediate frame p1 includes an outer frame portion p11 that has substantially the same shape as the seat frame body M in plan view, and a flexible mesh-like upholstery material p12 stretched inside the outer frame portion p11. We are prepared. In addition, in FIG. 18, the upholstery material p12 is shown as a coarse mesh for convenience of explaining other parts using symbols.

The seat cushion p2 is formed of a foamed material such as urethane and has a substantially rectangular shape in plan view, and has a known configuration capable of exhibiting a predetermined cushioning property. The center portion of the seat cushion p2 is supported from below by an elastic tension material p12 in the seat intermediate frame p1.

The upholstery p3 is sewn from a cloth material. The end portion, that is, the peripheral edge of the seat upholstery p3 is accommodated on the lower surface side of the outer frame portion p11 of the seat intermediate frame p1, and is connected to the outer frame portion p11 of the seat intermediate frame p1 and the seat frame body M of the seat frame S. It can be held between the two.

When the seat body P receives a downward load from the seated person, the center portions of the seat upholstery p3 and the seat cushion p2 are pressed downward, and as a result, the upholstery material p12 of the seat intermediate frame p1 is bent and deformed downward. become. The seat frame main body M arranged under the seat intermediate frame p1 has a frame shape corresponding to the outer frame part p11, and the front bridge frame T and rear bridge frame J that support the seat frame main body M are respectively It has a curved shape convex downward.

Therefore, even if the central part of the seat body P is bent significantly downward due to the load of the seated person, the seat frame body M cooperates with the seat intermediate frame p1 on which the upholstery p12 is arranged, and the seat body P The peripheral portion of the seat body P can be suitably supported while allowing the central portion to be bent within a certain range. Moreover, the front bridge frame T and the rear bridge frame J, which are curved downward, have a suitable form that makes it difficult for them to interfere with the seat body P, which is bent downward.

<<Lean back E>>
The backrest E includes a backrest main body Q made of synthetic resin and an upholstery R serving as an exterior material covering the backrest main body Q. The backrest E is supported via a support C so as to be rotatable in the front-rear direction with respect to the support base B.

<Backrest body Q>
The backrest main body Q includes a backrest base 7 which is located on the back side of the seated person and has a shape capable of supporting the back of the seated person from the rear side, and a backrest base 7 which is provided under the backrest base 7 and has a shape in plan view and bottom view. The connecting portion 8 has a substantially U-shape and is connected to the support C.

The connecting portion 8 includes left and right side connecting portions 81 that are paired on the left and right and extending in the front-rear direction, and a rear connecting portion 82 that connects the rear ends of the left and right side connecting portions 81. Each inner side of the left and right side connection parts 81 can fit into the outer side of the side frame of the support C, and the front part of the rear connection part 82 can fit into the rear side of the rear frame L of the support C. It is possible to match.

The connecting portion 8 of the backrest E is guided by a rail-shaped positioning protrusion k11 provided on the side of the support C and extends in the front-rear direction, and is attached while sliding so as to be inserted into the rear of the support C. It has become.

The connecting portion 8 has a substantially U-shape in plan view as a whole, including the left and right side connecting portions 81 and the rear connecting portion 82 . The connecting portion 8 can be fitted from the outside to the rear portion of the support C, which is formed by the left and right side frames K and the rear frame L and has a convex shape in plan view as a whole.

In other words, the backrest main body Q has external fitting parts 81a and 82a that can be externally fitted into the fitting parts for attaching the backrest provided on the support body C to the inner parts and rear connecting parts of the left and right side connecting parts 81. It is installed in the front part of 82.

The external fitting portion 81a of the left and right side connecting portions 81 has a recessed portion 81b that is provided in the vertically intermediate portion and into which the positioning protrusion k11 formed on the left and right side frames K of the support body C can fit, and a recessed portion 81b of the recessed portion 81b. It includes upholstery holding parts 81c which are provided above and below and can hold the ends of the upholstery R, and a nut part n2 into which the screw v2 passing through the screw insertion hole h2 of the positioning protrusion k11 is screwed. For example, an end portion of the upholstery R to which a synthetic resin band-like member (not shown) is sewn is pushed into the upholstery holding portion 81c.

Note that a upholstery end storage space 81d capable of accommodating the end of the upholstery R is formed at the front end portions of the left and right side connection portions 81. A notch 81e is formed at the outer edge of the front end of the left and right side connecting portions 81 to facilitate introduction of the end of the upholstery R into the upholstery end accommodation space 81d.

The external fitting part 82a of the rear connection part 82 is provided with a recessed part 82b provided in the vertically intermediate part and into which the positioning protrusion L11 formed on the rear frame L of the support body C can fit, and provided above and below the recessed part 82b. It includes a upholstery holding part 82c that can hold the end of the upholstery R, and a nut part n3 into which the screw v3 passing through the screw insertion hole h3 of the positioning protrusion L11 is screwed. For example, an end portion of the upholstery R to which a synthetic resin band-like member (not shown) is sewn is pushed into the upholstery holding portion 82c.

In this embodiment, the backrest main body Q is composed of a central member q1 that constitutes the main part of the backrest base 7, and left and right side members q2 fixed to both left and right sides of the central member q1. There is. The inner side part of the side member q2 is fixed to the center member q1 by a screw v7 while being fitted inside the outer part of the center member q1. The central member q1 is made of a synthetic resin that is more flexible than the side members q2. Since the side members q2 include the left and right side connecting portions 81 that protrude forward, they are made of synthetic resin that has higher strength than the center member q1.

<Upholstery R>
The upholstery R is a bag-like material that can cover substantially the entire backrest main body Q, and is sewn from a cloth material with a sheet-like cushioning material (not shown) attached inside.

Note that the upholstery R may have an appropriate structure. As the upholstery R, for example, a cushioning material is arranged between two cloth materials and then quilted.

The external fitting parts 81a, 82a of the backrest main body Q and the fitting part of the support C are such that the end of the upholstery R, that is, the vicinity of the lower end which becomes the open end, is sandwiched between the backrest main body Q and the support C. It is in a state that it is fitted. Further, the left and right side end portions of the lower edge of the upholstery R are accommodated in the upholstery end accommodation space 81d, which is a space formed at the front end of the left and right side connection portions 81 of the backrest main body Q. It is closed by the back surfaces of both end portions 3b of the bridge frame body 3.

<<Armrest F>>
The armrest F has a rectangular frame shape in side view and includes an armrest main body f1 having an upwardly facing arm rest f11 at the upper end, and an armrest arm f2 extending downward from the front part of the lower end of the armrest main body f1. It is equipped with the following.

The armrest arm f2 has a base end f21, which is a lower end, connected to an armrest attachment part 32 provided on the rear bridge frame J. The base end f21 of the armrest arm f2 is configured to fit into the recess b1 of the rear bridge frame J.

The base end f21 of the armrest arm f2 includes a positioning protrusion f22 projecting from the upper surface side and extending in the left-right direction, and a screw insertion hole h1 penetrating in the vertical direction and provided before and after the positioning protrusion f22. There is. The positioning protrusion f22 of the base end f21 can engage with a guide recess b17 formed in the upper wall b12 of the recess b1 in the rear bridge frame J.

<<Locking mechanism Rc>>
The locking mechanism Rc is for moving the seat D in synchronization with the tilting movement of the backrest E.

The locking mechanism Rc provided in the chair includes a support base B, a support body C supported by the support base B via the main shaft j1, and a front link shaft relative to the link member 2 pivotally supported on the support base body 1. It is mainly composed of a seat D supported via a seat support shaft j2 and a support C via a seat support shaft j4, and a backrest E attached to the support C.

The locking mechanism Rc of this embodiment includes a seat support shaft j4 disposed in front of the main shaft j1, and a link member 2 rotatably supported in front of the main shaft j1 with respect to the support base body 1 via a rear link shaft j3. are arranged. Therefore, the locking mechanism Rc is of a so-called weight sensing type, and is configured such that when the backrest E is tilted backward from the normal posture, the seat D moves rearward and rises as a whole.

Further, the backrest E is configured to fit into the support C and to be firmly integrated with it, so that it can rotate together with the support C relative to the support base B.

The chair of this embodiment has a structure in which a frame-shaped seat frame main body M can be supported from below by a front bridge frame T extending in the left-right direction and a rear bridge frame J extending in the left-right direction. .

Therefore, the seat body P having the seating surface has an excellent degree of freedom in design for forming the space sp in which the seat body P can bend downward. The front bridge frame T and the rear bridge frame J each extend substantially linearly in the left-right direction when viewed from above, making it easy to design them to ensure strength without complicating their shapes. .

Moreover, the front shaft holding part 6 is provided at the middle part in the left-right direction of the front bridge frame T extending in the left-right direction, and the main shaft holding part 4 is provided at the middle part in the left-right direction of the rear bridge frame J. Therefore, the chair has a degree of freedom in design to locally arrange the front shaft holding part 6 and the main shaft holding part 4 at the center in the left and right direction while maintaining the strength to hold the front link shaft j2 and the main shaft j1. It is excellent.

That is, in this chair, the front shaft holding portion 6 and the main shaft holding portion 4 are locally unified at the center in the left-right direction. Therefore, it is easy to design the front shaft holding portion 6 and the main shaft holding portion 4 to have a short width dimension in the left and right direction.

As a result, the width dimension of the support base B that can support the front shaft holder 6 and the main shaft holder 4 can also be designed to be as small as possible. A chair having such a configuration allows the support base B to be easily designed to have a suitable appearance that gives a slim and clean impression.

In particular, since the front shaft holder 6 and the main shaft holder 4 are arranged in a single block at the center in the left-right direction, the support base main body 1 is placed at the front on both sides of the main shaft holder 4, which is a single block. The link member 2 adopts a structure in which a shaft support portion 12 is provided, and left and right link members 2a and 2b are provided on both sides of a front shaft holding portion 6 forming a single block. Therefore, the support base B is difficult to complicate as a whole and is easy to realize a relatively simple form.

In addition, in the chair of this embodiment, the armrest mounting portion 32 is provided on the rear bridge frame J that can rotatably support the seat D in the front-back direction, so the armrest F is supported at a suitable position with excellent strength. It is something that can be done.

The chair of this embodiment has a structure in which a backrest E fits into a support C having an annular frame portion w1. Therefore, by using the support body C having the annular frame portion w1, it is possible to maintain the strength to support the backrest E while providing excellent design freedom in achieving a lightweight structure and a suitable appearance. They are able to provide chairs.

In the chair of this embodiment, an operating lever V is arranged on the side of a front bridge frame T extending in the left-right direction. Therefore, it is possible to provide a chair in which the operating lever V is located at a suitable position close to the seating surface of the seat body P and easy for the user to operate.

As described above, the chair according to the present embodiment includes a seat D having a seat frame S, and a bridge that extends in the left-right direction and is disposed under the seat D and can rotatably support the seat frame S. It is equipped with a rear bridge frame J as a frame. The rear bridge frame J is provided with an armrest attachment part 32 to which an armrest F can be attached.

Therefore, with the invention according to this embodiment, it is possible to provide a chair that has excellent strength and can support the armrest F at a suitable position that can prevent the armrest F from increasing in size.

That is, since the rear bridge frame J that can rotatably support the seat frame S extends in the left-right direction, it is easy to realize the strength that can support the armrest F. Moreover, since the rear bridge frame J is disposed at a position where it can rotatably support the seat frame S, by supporting the armrest F on the bridge frame J, the proximal end f21 of the armrest F can be This can suitably prevent the distance from the elbow rest f11 from becoming excessively long.

Armrest attachment parts 32 are arranged at both ends of the rear bridge frame J.

Therefore, the rear bridge frame J has the armrest mounting portion 32 arranged at a suitable position where the base end portion f21 of the armrest F can be easily attached and the armrest F can be prevented from increasing in size.

The armrest attachment part 32 is provided with a recess b1 open to the outside, and the base end f21 of the armrest F or the cover material G can be fitted into the recess b1.

For this reason, the armrest attachment portion 32 has a suitable form on which the base end portion f21 of the armrest F can be easily attached.

The rear bridge frame J holds seat support shafts j4 that pivotally support the seat D on both sides.

Therefore, the rear bridge frame J can easily realize a form capable of supporting both sides of the seat D so as to stably support the seat D.

A rear bridge frame J is rotatably supported in the front-rear direction via a main shaft j1 with respect to a support base B attached to the upper end of the leg A. In a side view, the seat support shaft j4 is set to be located in front of the main shaft j1.

Therefore, with the chair of this embodiment, a so-called weight-sensing locking mechanism Rc that allows the seat D and the rear bridge frame J to move upward and backward in conjunction with the backward tilting movement of the backrest E is preferably realized. It has become possible.

The rear bridge frame J constitutes a support C rotatably supported in the front-rear direction with respect to a support base B attached to the upper end of the leg A. The support C is provided with backrest attachment parts k1 and L1 to which the backrest E can be attached, and an armrest attachment part 32.

Therefore, the support C including the rear bridge frame J can suitably support the seat D, the backrest E, and the armrests F. In other words, since the support C is interposed between the seat D and the backrest E, a structure is adopted in which the backrest E and the seat D are relatively rotatably connected to form the locking mechanism Rc. Not only is the structure of the backrest E and the seat D not only prevented from becoming large or complicated, but also the structure of the support base B is not easily made large or complicated.

The support body C includes a rear bridge frame J, left and right side frames K extending rearward from both left and right sides of the rear bridge frame J, and a rear frame L connecting the rear ends of the left and right side frames K. It is something that Backrest attachment parts k1 and L1 are provided on the outer sides of the left and right side frames K and the rear frame L.

Therefore, the support body C can have an annular structure with excellent rigidity, and the backrest attachment parts k1 and L1 can be arranged at suitable positions.

The rear bridge frame J includes a rear bridge frame main body 3 which is a bridge frame main body curved to form a convexity downward when viewed from the front, and a support base B which is provided to protrude downward from the left-right center of the rear bridge frame main body 3. The main spindle holding part 4 is capable of holding the main spindle j1 disposed on the main shaft j1.

Therefore, the rear bridge frame main body 3 can take a suitable form in which it is difficult to interfere with the seat main body P even if the seat main body P is bent downward. Moreover, since the spindle holding portion 4 is provided at the center in the left-right direction, there is a degree of freedom in design that allows the horizontal dimension of the support base B that can support the spindle j1 to be made as small as possible. It is excellent.

Note that the present invention is not limited to the embodiments detailed above.

Various specific aspects of the armrest attachment portion provided on the bridge frame can be applied, and are not limited to those shown in the embodiments described above.

For example, the armrest mounting portion may be configured to protrude outward, and the base end of the armrest may be configured to fit externally into the armrest mounting portion arranged on the bridge frame. .

The support may be any support as long as it includes a bridge frame, and is not limited to the structure shown in this embodiment. For example, the support body may not include left and right side frames or a rear frame.

The bridge frame constituting the support body can be formed into an appropriate shape, and is not limited to that shown in the embodiments described above.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

3... Rear bridge frame body 4... Main shaft holding part 5... Front bridge frame main body 6... Front shaft holding part 32... Armrest attachment part C... Support body D... Seat J... Rear bridge frame M... Seat frame body S... Seat frame T …Front bridge frame

Claims (6)

A chair comprising a seat having a seat frame, and a bridge frame extending in the left-right direction and disposed under the seat to rotatably support the seat frame,
The bridge frame includes an armrest attachment part to which an armrest can be attached, and constitutes a support body rotatably supported in the front-rear direction with respect to a support base attached to the upper end of the leg,
The support body is provided with a backrest attachment part to which a backrest can be attached, and the armrest attachment part, and the bridge frame and left and right side frames extending rearward from both left and right sides of the bridge frame. and a rear frame that connects the rear ends of these left and right side frames,
The chair , wherein the backrest attachment portions are provided on the outer sides of the left and right side frames and the rear frame . A chair comprising a seat having a seat frame, and a bridge frame extending in the left-right direction and disposed under the seat to rotatably support the seat frame,
The bridge frame is provided with an armrest attachment part to which an armrest can be attached,
The bridge frame can hold a bridge frame main body that is curved to form a convexity downward when viewed from the front, and a main shaft that protrudes downward from a left-right center portion of the bridge frame main body and is disposed on a support base. A chair comprising a main shaft holder . The chair according to claim 1 or 2 , wherein the armrest attachment portions are arranged at both end portions of the bridge frame. 4. The chair according to claim 3 , wherein the armrest attachment portion has a recess opened outward, and a base end portion of the armrest or a cover material can fit into the recess. The chair according to claim 1, 2 , 3 or 4 , wherein the bridge frame holds seat support shafts that pivotally support the seat on both sides. The bridge frame is rotatably supported in the front-rear direction via a main shaft with respect to a support base attached to the upper end of the leg,
6. The chair according to claim 5 , wherein the seat support shaft is positioned in front of the main shaft in side view.

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