JP2021052978A - Chair - Google Patents

Abstract

To provide a chair excellent in a degree-of-freedom of a layout enabling forming of a space under a seat.SOLUTION: A chair comprises: a leg; a support base part B mounted on an upper end part of the leg; a support body C rotatably supported to the support base part B; and a seat D having a seat frame S rotatably supported to the support body C. The support body C has a rear bridge frame J extending in the right-left direction and rotatably supporting the seat frame S in both right and left end parts. A central part in the right-left direction of the rear bridge frame J is rotatably supported in the front-back direction in the rear part of the support base part B via a main shaft j1 extending in the right-left direction.SELECTED DRAWING: Figure 16

Description

The present invention relates to a chair preferably used in an office or the like.

Conventionally, a front frame extending forward and upward is provided on the support base, and a link member extending upward is provided near the base end of the back frame, and a seat is supported at each upper end of the front frame and the link member. Such chairs are known (see, for example, Patent Document 1).

In this type of chair, the link members provided on the front frame and the back frame provided on the support base form a space that allows the seating surface to bend downward.

However, with such a configuration, the structure of the support base and the back frame becomes complicated in order to provide the front frame and the link member. In other words, conventional chairs have limited design freedom that can form a space under the seat.

Japanese Unexamined Patent Publication No. 2016-83114

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a chair having an excellent degree of freedom in design that can form a space under a seat.

That is, the present invention has the following configuration.

The chair according to claim 1 is rotatable with respect to a leg, a support base attached to an upper end portion of the leg, a support rotatably supported with respect to the support base, and a support rotatably supported with respect to the support base. A chair with a seat having a supported seat frame, the support having a first bridge frame that extends laterally and can rotatably support the seat frame at both left and right ends. A chair in which the central portion in the left-right direction of the first bridge frame is rotatably supported in the front-rear direction at the rear portion of the support base portion via a spindle extending in the left-right direction.

The chair according to claim 2 has a first bridge frame body in which the first bridge frame is curved downward so as to be convex downward in a front view, and a center in the left-right direction of the first bridge frame body. The chair according to claim 1, further comprising a spindle holding portion that protrudes downward from the portion and is capable of holding the spindle.

The chair according to claim 3 includes a second bridge frame that extends in the left-right direction and is rotatably supported in the front-rear direction at the front portion of the support base, and the seat frame has a frame shape. The chair according to claim 1 or 2, wherein the seat frame main body is provided, and the seat frame main body is supported by the first bridge frame and the second bridge frame.

The chair according to claim 4 is the chair according to claim 3, wherein the seat frame main body and the second bridge frame are integrally formed of synthetic resin.

The chair according to claim 5 includes a second bridge frame main body having a curved portion in which the second bridge frame is curved downward so as to form a convex downward in a front view, and the second bridge. The chair according to claim 3 or 4, further comprising a front shaft holding portion that protrudes downward from the central portion in the left-right direction of the frame body and is provided on the support base portion and can hold the front shaft.

The chair according to claim 6, wherein the support is provided with a backrest attachment portion to which a backrest can be attached and an armrest attachment portion to which an armrest can be attached. The chair described.

In the chair according to claim 7, the support includes the first bridge frame, the left and right side frames extending rearward from the left and right side portions of the first bridge frame, and the left and right side frames. The chair according to claim 1, 2, 3, 4, 5 or 6, which includes a rear frame connecting the rear ends.

The chair according to claim 8 is a link in which the support base is pivotally attached to the support base main body on which the main shaft is arranged, and the base end portion is pivotally attached to the support base main body and the tip portion is pivotally attached to the seat frame. The chair according to claim 1, 2, 3, 4, 5, 6 or 7, which is provided with a member.

As described above, according to the present invention, it is possible to provide a chair having an excellent degree of freedom in design that can form a space under the seat.

The perspective view which shows one Embodiment of this invention. Front view in the same embodiment. The rear view in the same embodiment. Left side view in the same embodiment. The right side view in the same embodiment. The plan view in the same embodiment. Bottom view in the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. The exploded right side view in the same embodiment. The rear view of the same embodiment excluding the backrest. Partially enlarged front view of the backrest in the same embodiment. FIG. 4 is a cross-sectional view taken along line XX in FIG. FIG. 2 is a cross-sectional view taken along the line YY in FIG. An exploded perspective view of the same embodiment. The plan view in the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. The plan view in the same embodiment. Partially enlarged perspective view in the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. Partially enlarged perspective view in the same embodiment. Enlarged left side view of the support base in the same embodiment. Enlarged right side view of the support base in the same embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 27.

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

The chair has 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 with respect to the support base B. It is provided with a seat D that is rotatably supported and whose rear portion is rotatably supported with respect to the support C, a backrest E that is supported by the support C, and an armrest F that is supported by the support C. It is a thing.

In the chair, the backrest E, the seat D, and the armrest F are operated between the normal posture in which there is no load and the backward leaning posture (not shown) in which the posture is tilted backward from the normal posture. A locking mechanism Rc configured to obtain is provided.

Hereinafter, each configuration of the chair will be described in detail.

<< Leg A >>
The leg A includes a plurality of leg blades a1 having casters a11 at the tip thereof and arranged radially, and leg columns a2 erected at the base end portion of the leg blades a1.

Inside the leg support a2, a gas spring a3 that can expand and contract in the vertical direction is provided. The leg support a2 is configured to be stretchable in the vertical direction by a gas spring a3, and 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 able to rotate. The support base portion B includes a support base body 1 fixed to the upper end of the leg support a2 and a link member 2 rotatably supported on the front end of the support base 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 forms a reaction force spring arrangement space in which the reaction force spring 13 can be arranged. A cylindrical leg connecting portion 11 to which the upper end portion of the gas spring a3 is connected is provided at the rear portion of the support base main body 1.

A spindle j1 for rotatably supporting the support body C is arranged on the support base main body 1. That is, a pair of left and right spindle support portions 12 that can support both ends of the spindle j1 extending in the left-right direction are projected upward at the rear portion of the support base body 1.

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

The rear link shaft j3 also serves as the rotation shaft j7 of the reaction force operating lever 14 capable of operating 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 spindle support portion 12.

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

The rotating shaft j7 is provided with a cam member 13d in which the tip end portion of the reaction force adjusting pin 13c in the reaction force spring 13 is directly engaged. The reaction force adjusting pin 13c constitutes the axial center of the reaction force spring 13. The reaction force adjusting pin 13c is configured so as to be able to protrude from the front mount portion 13b arranged at the front end portion of the spring body 13a of the reaction force spring 13. Then, the elastic repulsive force of the reaction force spring 13 can be changed by rotating the reaction force operation lever 14 to rotate the cam member 13d and retracting the reaction force adjustment pin 13c.

In this embodiment, the reaction force operating lever 14 can be rotated so as to be able to take three postures capable of changing the engagement between the cam member 13d and the reaction force adjusting pin 13c.

That is, the chair has a backward tilted lock state in which the backrest E and the seat D do not tilt backward due to the reaction force operating lever 14 taking three postures, and the backrest E and the seat D have a relatively strong reaction force. A strong reaction force that allows backward tilting (not shown) and a weak reaction force that allows backward tilting while the backrest E and seat D have 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 main body 1. That is, the link member 2 has a normal posture extending in the longitudinal direction substantially matching the longitudinal direction of the support base main body 1 in a side view, and a front end portion of the link member 2 in conjunction with the backward tilting motion of the backrest E and the seat D. Is rotatably supported with respect to the support base main body 1 with the standing posture (not shown) that has moved upward.

The link member 2 has a base end portion pivotally attached to the support base body 1 and a tip end portion pivotally attached to the seat frame S. The front portion of the link member 2 is connected to the seat D via the front link shaft j2 which is the front shaft, and the rear portion of the link member 2 is connected to the support base main body 1 via the rear link shaft j3. The rear end edge and the front end edge of the link member 2 have a partial circular shape in a side view. Both side portions of the front end edge of the support base main body 1 have a shape recessed in a partial circular shape according to the shape of the rear end 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 (opposite the end to which the lever body 141 is attached) are not exposed to the outside. .. Specifically, the link member 2 is formed by supporting both ends of the front link shaft j2 by a left link material 2a and a right link material 2b which are divided into left and right parts and have a substantially half shape.

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

That is, as shown in FIGS. 26 and 27, the support base main body 1 has a first upper edge portion u1 forming a straight line configured to gradually move away from each other in the rearward direction in a lateral view, and a first lower edge portion u1. It has an edge s1. Similarly, the link member 2 includes a second upper edge portion u2 forming a straight line configured to gradually move away from each other in the rearward direction in a lateral view, and a second lower edge portion s2.

The support base portion B includes a first virtual intermediate line c1 located between the first upper edge portion u1 and the first lower edge portion s1 of the support base body 1, and a second upper edge portion u2 of the link member 2 in a normal posture. The relative positions of the support base 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 is located on the same straight line.

Further, the support base portion 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.

Further, the support base portion B has a substantially surface surface of an upper surface portion 16 corresponding to the first upper edge portion u1 of the support base main body 1 and an upper surface portion 22 corresponding to the second upper edge portion u2 of the link member 2 in a normal posture. It is set to make one. Similarly, the support base portion B includes a lower surface portion 17 corresponding to the first lower edge portion s1 in the support base body 1 and a lower surface portion 23 corresponding to the second lower edge portion s2 in the link member 2 in the normal posture. Is set to be approximately flush with each other.

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 portion 6 constituting the seat frame S in bottom view. The outline of a substantially rectangular shape is formed.

<< Support C >>
The support C can support the seat D in cooperation with the support base B. The support body C is interposed between the support base B and the backrest E, and is interposed 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 C is provided with backrest attachment portions k1 and L1 to which the backrest E can be attached, and an armrest attachment portion 32 to which the armrest F can be attached. The support C is set to take a posture of leaning forward with respect to the horizontal as a whole in a normal posture.

The support 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 sides. It is provided with a rear frame L that connects the rear ends of the side frame K. The support C has an annular frame portion w1 that is continuous in an annular shape.

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 body C is rotatably supported in the front-rear direction via the spindle j1 at the rear portion of the support base portion B attached to the upper end portion of the leg A. The support body C can rotatably support the seat frame S arranged on the support body C in the front-rear direction.

<Rear bridge frame J>
The rear bridge frame J is arranged below the seat D. The rear bridge frame J is projected downward from the rear bridge frame main body 3, which is the first bridge frame main body curved so as to be convex downward in the front view, and the central portion in the left-right direction of the rear bridge frame main body 3. It is provided with a spindle holding portion 4 capable of holding the spindle j1 supported by the support base B.

[Rear bridge frame body 3]
The rear bridge frame main body 3 is long in the left-right direction, and its left-right width dimension is set to substantially the same as the left-right width dimension in the seat frame main body M. The rear bridge frame main body 3 has a form in which a strip-shaped plate material extending in the left-right direction as a whole is curved so that an intermediate portion is located below both end portions. In other words, the rear bridge frame main body 3 has an inverted arch shape when viewed from the front.

When the support C takes a normal posture, the rear bridge frame main body 3 is set so that its upper surface faces diagonally upward. That is, the rear bridge frame main body 3 is configured so that when the backrest E is tilted backward, the portion supporting the seat support shaft j4 can be located above the main shaft j1 as compared with the normal posture.

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

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

The central portion 3a of the main body integrally projects the spindle holding portion 4 downward from the intermediate portion in the left-right direction.

The rear bridge frame main body 3 can rotatably support the seat frame S at both left and right ends via the seat support shafts j4. That is, the rear bridge frame main body 3 is provided with first shaft holding portions 31 projecting upward on both left and right side portions, and each shaft holding portion 31 is provided with a seat support shaft j4 that pivotally supports the seat D. I'm holding it.

In other words, the first shaft holding portion 31 capable of rotatably supporting the seat D via the seat support shaft j4 is raised on both end portions 3b of the main body. The seat support shaft j4 is set so as to be located above the main shaft j1 and in front of the main shaft j1 in the side view so that the body weight sensing type locking mechanism Rc can be formed.

The rear bridge frame main body 3 includes armrest attachment portions 32 to which armrests F can be attached to both ends. The armrest mounting portion 32 is provided with a recess b1 that is open to the outside, and the base end portion f21 of the armrest F or the cover material G can be internally fitted into the recess b1. The armrest mounting portion 32 is formed on both end portions 3b of the rear bridge frame main 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 portion f21 of the armrest F is inserted into the insertion space b11, and the base end portion f21 of the armrest F is internally fitted into the recess b1. On the inner surface side of the upper wall b12, a guide recess b17 extending in the insertion / removal direction of the base end portion f21 of the armrest F and nut portions n1 provided on both sides of the guide recess b17 are provided.

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

When the armrest F is not attached to the chair of this embodiment, as shown in FIG. 20, the cover material G is internally fitted to the recess b1 so that the recess b1 is not exposed to the outside. You can do it.

[Spindle holder 4]
The main shaft holding portion 4 can hold the main shaft j1 which is projected downward from the central portion in the left-right direction of the rear bridge frame main body 3 and is arranged on the support base portion 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 spindle holding portion 4 is set to a size that can be arranged between the spindle support portions 12 provided in a standing wall shape in pairs on the support base portion B on the left and right.

The spindle holding portion 4 is provided with holding arms 42 that are paired to the left and right toward the front and lower directions at a position below the spindle insertion hole 41. A pressed shaft j5 to which the rear end portion of the reaction force spring 13 is connected is supported between the tip portions of the holding arm 42. That is, the support C is set so that the pressed shaft j5 located below the main shaft j1 can take a normal posture in a no-load state by being pressed backward by the reaction force spring 13.

<Left and right side frames K>
The left and right side frames K extend substantially linearly from the inner portion of both end portions 3b of the main body of the rear bridge frame main body 3 toward the rear. The left and right side frames K are provided with a backrest mounting portion k1 to which a backrest E is attached to the left and right outer portions.

The backrest mounting portions k1 provided on the left and right side frames K penetrate in the left-right direction through which the fitting portion, which is a portion to be internally fitted into the backrest E, and the screw v2 screwed to the backrest E are inserted. It is provided with a screw insertion hole h2. More specifically, the fitting portion of the backrest mounting portion k1 is mainly composed of a positioning projection k11 projecting outward from the vertical intermediate portion of the outer portion of the left and right side frames K. There is.

<Rear frame L>
The rear frame L is bridged between the rear ends of the left and right side frames K. The rear frame L has a shape curved so as to form a convex rearward as a whole. The rear frame L is provided with a backrest mounting portion L1 to which the backrest E is attached to the outer side, that is, the rear portion.

The backrest mounting portion L1 provided on the rear frame L is a fitting portion that is internally fitted into the backrest E and a screw that penetrates in the front-rear direction through which the screw v3 screwed to the backrest E is inserted. It is provided with an insertion hole h3. More specifically, the fitting portion of the backrest mounting portion L1 is mainly composed of a positioning projection L11 projecting outward from the vertical intermediate portion of the outer portion of the rear frame L.

<Circular frame part w1>
The support C includes an annular frame portion w1 having a fitting portion that can be fitted with the connecting portion 8 of the backrest main body Q. The annular frame portion w1 is composed of 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 a plan view. The 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 constituting the annular frame portion w1 and the rear side portions of the rear frame L.

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

As shown in FIG. 18, in order to preferably secure a downward bending allowance for the seat body P, the chair has a space w2s surrounded by a frame-shaped portion w2 of the seat frame body M and a support in a plan view. The positions of the seat frame S and the support 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 a posture tilted forward with respect to the horizontal as a whole in the normal posture.

<< Seat D >>
The seat D includes a seat frame S including an annularly continuous frame-shaped member, and a seat body P having a seating surface and mounted on the seat frame S.

<Seat frame S>
The seat frame S includes a frame-shaped seat frame main body M and a front bridge frame T which is a second bridge frame provided in a bridge shape connecting the left and right end portions 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 annularly continuous frame-shaped portion w2.

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

The seat frame body M is behind the left and right seat side frame portions m1 extending in the front-rear direction, the seat front frame portion m2 connecting the front ends of the left and right seat side frame portions m1, and the left and right seat side frame portions m1. It is provided with a seat rear frame portion m3 that connects the ends. That is, the seat frame main body M is composed of the left and right seat side frame portions m1, the seat front frame portion m2, and the seat rear frame portion m3 to form a frame-shaped portion w2 that is continuous in a rectangular ring shape.

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

The left and right seat side frame portions m1 extend substantially linearly in the front-rear direction. The left and right seat side frame portions m1 are provided with a second shaft holding portion m11 capable of holding the seat supporting shaft j4 downward from the inner edge portion of the rear portion. That is, the seat support shaft j4 is held by the second shaft holding portion m11 provided on the seat frame S and the first shaft holding portion 31 provided on the support C, so that the seat frame S moves back and forth with respect to the support C. It can rotate in the direction.

The seat front frame portion m2 extends substantially linearly in the left-right direction. The rear frame portion m3 has a shape curved so as to form a convex rearward as a whole.

[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 rotatably supported in the front-rear direction with respect to the support base portion B at the front portion of the support base portion B.

The front bridge frame T has a front bridge frame body 5 which is a second bridge frame body having a curved portion 5a curved so as to form a convex downward in the front view, and a center in the left-right direction of the front bridge frame body 5. It is provided with a front shaft holding portion 6 that is projected downward from the portion and is provided on the support base portion B and can hold the front link shaft j2 which is the front shaft.

On the left side of the front bridge frame T, an operating lever V for raising and lowering the seat is provided so that the seat D can be moved up and down with respect to the legs A.

(Front bridge frame body 5)
The front bridge frame main body 5 has a curved shape portion 5a that is curved so as to form a convex downward in a front view, and the left and right upper ends of the curved shape portion 5a that extend upward from the left and right end portions of the seat frame main body M. It is provided with left and right upright walls 5b and 5c connected to the seat side frame portion m1.

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

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

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

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

The operation lever V is supported by the operation lever support portion 51. The operation lever V extends forward and rearward so as to project outward through the through hole 5d formed in the left upright wall 5b and to project forward and rearward from the base end portion va and pivotally supported by the lever holding member Z. It is provided with a lever shaft j6 and a wire support portion ws disposed under the lever shaft j6 at the base end portion va. The wire support portion ws can support the end portion wyt of the wire wy that transmits the operating force to the gas spring a3 provided on the leg A.

The operation lever support portion 51 includes a lever holding member Z that is attached to the inner surface of the left upright wall 5b and the left end portion of the curved shape portion 5a and can rotatably support the operation end tn of the operation lever V in the vertical direction. I have.

The lever holding member Z includes a shaft support portion z1 capable of rotatably supporting the lever shaft j6 arranged at the base end portion va of the operation lever V, a wire communication passage z2 for communicating the wire wy in the left-right direction, and an inner portion. A screw insertion hole h5 through which a screw v5 is inserted and screwed into a curved portion 5a, and a screw v6 through which a screw v6 is inserted in an outer portion and screwed to the upper part of the left upright wall 5b. It is provided with an insertion hole h6. The lever holding member Z is formed with an accommodating space za capable of accommodating the base end portion va of the operating lever V.

When the operation end nt of the operation lever V is moved upward by the operation of the user's finger, the end portion wyt of the wire wy supported by the wire support portion ws is pulled toward the operation end nt side. Then, the wire w actuated by the operating lever V can rotate the pressing member ps pivotally supported at the rear end portion of the support base portion B and press the operating pin of the gas spring a3 downward by the pressing member ps. ing.

In this embodiment, since the wire wy that can be operated by the operation lever V is provided so as to be located on the curved shape portion 5a and the support base portion B of the front bridge frame T, it is less noticeable from the outside.

(Front shaft holding portion 6)
The front shaft holding portion 6 is provided so as to hang downward from the central portion in the left-right direction of the curved shape 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 sandwiched between the left link material 2a and the right link material 2b in the link member 2. That is, the front shaft holding portion 6 is arranged on the left link material 2a and the right link material 2b. In other words, the left and right width dimensions of the front shaft holding portion 6 are set to be 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 body p1 arranged on the seat frame body M, a seat cushion p2 arranged on the seat intermediate frame body p1, and upper surfaces of the seat intermediate frame body p1 and the seat cushion p2. It is provided with a cushioning material p3 which is an exterior material that covers the side surface and the side surface side.

The seat intermediate frame body p1 comprises an outer frame portion p11 having substantially the same shape as the seat frame main body M in a plan view, and a flexible mesh-like tension member p12 stretched inside the outer frame portion p11. I have. In FIG. 18, the upholstery material p12 is displayed in a coarse mesh for convenience of explaining other parts with reference numerals.

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

The seating area p3 is sewn with a cloth material. The end portion, that is, the peripheral edge of the seating ground p3 is housed on the lower surface side of the outer frame portion p11 of the seat intermediate frame body p1, and the outer frame portion p11 of the seat intermediate frame body p1 and the seat frame body M of the seat frame S Can be pinched by.

When a downward load is applied by the seated person, the seat body P is deformed by bending downward as a result of the central portion of the seat cushion p3 and the seat cushion p2 being pressed downward. become. The seat frame body M arranged under the seat intermediate frame body p1 has a frame shape corresponding to the outer frame portion p11, and the front bridge frame T and the rear bridge frame J supporting the seat frame body M are respectively. It has a curved shape that is convex downward.

Therefore, even if the central portion of the seat body P is greatly bent downward due to the load of the seated person, the seat frame body M cooperates with the seat intermediate frame body p1 in which the tension material 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 bend in a certain range. Moreover, the front bridge frame T and the rear bridge frame J, which are curved downward, each have a suitable form in which they are unlikely to interfere with the seat body P, which is bent downward.

<< Backrest E >>
The backrest E includes a backrest main body Q formed of a synthetic resin and a stretched material R as an exterior material that covers the backrest main body Q. The backrest E is rotatably supported in the front-rear direction with respect to the support base B via the support C.

<Backrest body Q>
The backrest main body Q is provided under the 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 is provided under the backrest base 7 in plan view and bottom view. It has a substantially U-shape and is provided with a connecting portion 8 connected to the support C.

The connecting portion 8 includes left and right side connecting portions 81 that form a pair on the left and right and extend in the front-rear direction, and a rear connecting portion 82 that connects the rear end portions of the left and right side connecting portions 81. Then, each inner portion of the left and right side connecting portions 81 can be fitted to the outer portion of the side frame in the support C, and the front portion of the rear connecting portion 82 is fitted to the rear side portion of the rear frame L in the support C. It has become a match.

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

The connecting portion 8 has a substantially U-shaped plan view as a whole due to 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 having a convex shape in a plan view as a whole, which is composed of the left and right side frames K and the rear frame L.

In other words, the backrest main body Q has outer fitting portions 81a and 82a that can be externally fitted to the fitting portion for mounting the backrest provided on the support C, and is the inner portion and the rear connecting portion of the left and right side connecting portions 81. It is provided at the front part of 82.

The outer fitting portions 81a of the left and right side connecting portions 81 are recessed portions 81b provided in the intermediate portion in the vertical direction and into which positioning protrusions k11 formed on the left and right side frames K of the support C can be fitted, and recessed portions 81b. It is provided with an upholstery holding portion 81c provided on the upper and lower sides and capable of holding the end portions of the upholstery R, and a nut portion n2 to which the screw v2 passing through the screw insertion hole h2 of the positioning protrusion k11 is screwed. For example, the end portion of the upholstery R to which a band-shaped member (not shown) made of synthetic resin is sewn is pushed into the upholstery holding portion 81c.

At the front end of the left and right side connecting portions 81, an upholstery end accommodating space 81d capable of accommodating the end of the upholstery R is formed. A notch 81e is formed on the outer edge of the front end portion of the left and right side connecting portions 81 to facilitate the introduction of the end portion of the upholstery R into the upholstery end accommodating space 81d.

The outer fitting portion 82a of the rear connecting portion 82 is provided above and below the recessed portion 82b provided in the vertical intermediate portion and into which the positioning projection L11 formed on the rear frame L of the support C can be fitted. It includes a tension holding portion 82c that can hold the end portion of the tension R, and a nut portion n3 to which the screw v3 that has passed through the screw insertion hole h3 of the positioning protrusion L11 is screwed. For example, the end portion of the upholstery R to which a band-shaped member (not shown) made of synthetic resin 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 constituting the main portion of the backrest base 7, and left and right side members q2 anchored to both left and right side portions of the central member q1. There is. The inner portion of the side member q2 is fixed to the central member q1 by a screw v7 in a state of being internally fitted to the outer portion of the central member q1. The central member q1 is made of a synthetic resin having better flexibility than the side member q2. Since the side member q2 is a member including the left and right side connecting portions 81 protruding forward, it is formed of a synthetic resin having higher strength than the central member q1.

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

As the upholstery R, one having an appropriate structure can be adopted. Examples of the upholstery R include those in which a cushioning material is arranged between two pieces of cloth and then quilted.

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

<< Armrest F >>
The armrest F is a rectangular frame-shaped armrest body f1 having an upward elbow rest f11 at the upper end portion, and an armrest arm f2 extending downward from the front portion of the lower end portion of the armrest main body f1. It is equipped with.

In the armrest arm f2, the base end portion f21, which is the lower end portion, is connected to the armrest attachment portion 32 provided on the rear bridge frame J. The base end portion f21 of the armrest arm f2 is in a form of being internally fitted in the recess b1 of the rear bridge frame J.

The base end portion 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 screw insertion holes h1 provided in front of and behind the positioning protrusion f22 penetrating in the vertical direction. There is. The positioning protrusion f22 of the base end portion f21 can engage with the guide recess b17 formed in the upper wall b12 of the recess b1 in the rear bridge frame J.

<< Rocking mechanism Rc >>
The rocking mechanism Rc is for moving the seat D in synchronization with the tilting motion of the backrest E.

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

In the locking mechanism Rc of this embodiment, the seat support shaft j4 is arranged in front of the main shaft j1 and the link member 2 is rotatably supported in front of the main shaft j1 with respect to the support base main body 1 via the rear link shaft j3. Is arranged. Therefore, the rocking mechanism Rc is 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, since the backrest E is fitted to the support C and is firmly integrated, the backrest E can rotate with respect to the support base B together with the support C.

The chair of the present embodiment has a configuration capable of supporting a frame-shaped seat frame main body M 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 a seating surface has an excellent degree of freedom in design for forming a space sp that can bend downward. Since the front bridge frame T and the rear bridge frame J each extend substantially linearly in the left-right direction in a plan view, it is easy to design to secure the strength without complicating the shape. ..

Moreover, the front shaft holding portion 6 is provided in the left-right intermediate portion of the front bridge frame T extending in the left-right direction, and the spindle holding portion 4 is provided in the left-right intermediate portion of the rear bridge frame J. Therefore, the chair has a degree of freedom in design for locally arranging the front shaft holding portion 6 and the spindle holding portion 4 in the central portion in the left-right direction while maintaining the strength capable of holding the front link shaft j2 and the spindle j1. It has become an excellent one.

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

As a result, the width dimension of the support base portion B that can support the front shaft holding portion 6 and the spindle holding portion 4 can be designed to be as small as possible. The chair having such a configuration makes it easy to design the support base B to have a suitable appearance that can give a slim and neat impression.

In particular, since the front shaft holding portion 6 and the spindle holding portion 4 are arranged in a single mass shape in the central portion in the left-right direction, the support base main body 1 is front on both sides of the spindle holding portion 4 forming a single mass shape. The link member 2 is provided with the shaft support portion 12 and the left and right link members 2a and 2b are provided on both side portions of the front shaft holding portion 6 forming a single mass. Therefore, the support base B is less likely to be complicated as a whole, and it is easy to realize a relatively simple form.

Further, in the chair of the present embodiment, since the armrest mounting portion 32 is provided on the rear bridge frame J capable of rotatably supporting the seat D in the front-rear direction, the armrest F is supported at a suitable position having excellent strength. It is something that can be made to do.

The chair of the present embodiment has a configuration in which the backrest E is fitted to the support C having the annular frame portion w1. Therefore, by using the support C having the annular frame portion w1, the structure excellent in weight reduction and the degree of freedom in design for obtaining a suitable appearance are excellent while maintaining the strength capable of supporting the backrest E. It is possible to provide a chair.

In the chair of the present embodiment, the operation lever V is arranged on the side portion of the front bridge frame T extending in the left-right direction. Therefore, it is possible to provide a chair in which the operation lever V is arranged at a suitable position close to the seating surface of the seat body P and easily operated by the user.

As described above, the chair according to the present embodiment includes the legs A, the support base B attached to the upper end of the legs A, the support C rotatably supported with respect to the support base B, and the support. It is provided with a seat D having a seat frame S rotatably supported with respect to the body C.

Then, the support body C has a rear bridge frame J which is a first bridge frame extending in the left-right direction and capable of rotatably supporting the seat frame S at both left and right ends, and is centered in the left-right direction of the rear bridge frame J. The portion is rotatably supported in the front-rear direction at the rear portion of the support base portion B via a spindle j1 extending in the left-right direction.

Therefore, it is possible to provide a chair having an excellent degree of freedom in design that can form a space sp under the seat D.

That is, since the support C is provided with the rear bridge frame J extending in the left-right direction, the space sp can be flexibly formed under the seat D by setting the shape.

The rear bridge frame J is projected downward from the rear bridge frame main body 3, which is the first bridge frame main body curved so as to be convex downward in the front view, and the central portion in the left-right direction of the rear bridge frame main body 3. It is provided with a spindle holding portion 4 capable of holding the spindle j1.

Therefore, in the rear bridge frame J, the space sp can be suitably formed under the seat D depending on the shape of the rear bridge frame main body 3, and the main shaft j1 and the support base B are compactly arranged in the intermediate portion in the left-right direction. The design that can be arranged can be flexibly performed.

A front bridge frame T, which is a second bridge frame extending in the left-right direction and rotatably supported in the front-rear direction at the front portion of the support base B, is provided, and the seat frame S is a frame-shaped seat frame. The seat frame main body M is provided with the main body M, and the seat frame main body M is supported by the rear bridge frame J and the front bridge frame T.

Therefore, since the seat frame main body M is supported by the rear bridge frame J and the front bridge frame T, the seat frame main body M can be stably supported and the space sp under the seat frame main body M. Can be suitably formed.

The seat frame body M and the front bridge frame T are integrally formed of synthetic resin.

Therefore, the seat frame main body M and the front bridge frame T can be integrally handled in a manner excellent in strength.

The front bridge frame main body 5, which is the second bridge frame main body, and the front bridge frame main body 5 having a curved portion 5a curved so as to form a convex downward in the front view, and the center in the left-right direction of the front bridge frame main body 5. It is provided with a front shaft holding portion 6 that is projected downward from the portion and can hold the front link shaft j2 that is a front shaft provided on the support base portion B.

Therefore, the front bridge frame T can preferably form a space sp under the seat D depending on the shape of the front bridge frame main body 5, and the front link shaft j2 and the support base B are placed in the middle portion in the left-right direction. It is possible to flexibly design a compact arrangement.

The support C is provided with backrest attachment portions k1 and L1 to which the backrest E can be attached, and armrest attachment portions 32 to which the armrest F can be attached.

Therefore, the support C can not only support the seat D in cooperation with the support base B, but also support the backrest E and the armrest F only by the support C, so that the design of the support base B can be designed. The complexity can be suitably suppressed, which contributes to the compactness and simplification of the support base B.

The support C includes a rear bridge frame J, left and right side frames K extending rearward from the left and right side portions 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 a thing.

For this reason, the support C has a structure surrounded by an annular shape, and it is easy to exhibit a predetermined rigidity capable of supporting the seat D, the backrest E, and the armrest F.

The support base B includes a support base body 1 on which the main shaft j1 is arranged, and a link member 2 whose base end is pivotally attached to the support base body 1 and whose tip is pivotally attached to the seat frame S. is there.

Therefore, since the seat frame S is supported by the support base main body 1 via the support body C and is rotatably supported by the link member 2, the locking operation can be suitably taken.

The present invention is not limited to the embodiments described in detail above.

The support may be provided with a bridge frame, and is not limited to the structure shown in the present embodiment. For example, the support may not include the left and right side frames or the rear frame.

The bridge frame constituting the support can be formed in an appropriate form, and is not limited to that shown in the above-described embodiment.

The seat frame is not limited to the one in which the seat frame main body and the bridge frame are integrally formed of synthetic resin. The seat frame body and the bridge frame may be composed of separate and independent parts.

The bridge frame constituting the seat frame can be formed in an appropriate form, and is not limited to that shown in the above-described embodiment.

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 (bridge frame body / first bridge frame body)
4 ... Spindle holding part 5 ... Front bridge frame body (bridge frame body / second bridge frame body)
6 ... Front shaft holding part B ... Support base C ... Support D ... Seat E ... Backrest J ... Rear bridge frame (bridge frame, first bridge frame)
M ... Seat frame body S ... Seat frame T ... Front bridge frame (bridge frame, second bridge frame)

Claims (8)

A seat having a leg, a support base attached to the upper end of the leg, a support rotatably supported for the support base, and a seat frame rotatably supported for the support. It ’s a chair with and
The support has a first bridge frame that extends in the left-right direction and can rotatably support the seat frame at both left and right ends, and the central portion in the left-right direction of the first bridge frame is left-right. A chair that is rotatably supported in the front-rear direction at the rear portion of the support base via an extended spindle. The first bridge frame is a first bridge frame body that is curved so as to be convex downward in a front view, and the main shaft is projected downward from a central portion in the left-right direction of the first bridge frame body. The chair according to claim 1, further comprising a spindle holding portion capable of holding the chair. It is provided with a second bridge frame that extends in the left-right direction and is rotatably supported in the front-rear direction at the front portion of the support base.
Claim 1 or 2 in which the seat frame includes a frame-shaped seat frame body, and the seat frame body is supported by the first bridge frame and the second bridge frame. The listed chair. The chair according to claim 3, wherein the seat frame main body and the second bridge frame are integrally formed of synthetic resin. The second bridge frame has a curved portion that is curved downward so as to form a convex shape in the front view, and the second bridge frame body is downward from the central portion in the left-right direction. The chair according to claim 3 or 4, further comprising a front shaft holding portion that is projected from the support base and is provided on the support base so as to hold the front shaft. The chair according to claim 1, 2, 3, 4 or 5, wherein the support is provided with a backrest attachment portion to which a backrest can be attached and an armrest attachment portion to which an armrest can be attached. The support includes the first bridge frame, the left and right side frames extending rearward from the left and right side frames of the first bridge frame, and the rear frame connecting the rear ends of the left and right side frames. The chair according to claim 1, 2, 3, 4, 5 or 6. A claim in which the support base portion includes a support base main body on which the main shaft is arranged, and a link member whose base end portion is pivotally attached to the support base main body and whose tip end portion is pivotally attached to the seat frame. Item 1. The chair according to 2, 3, 4, 5, 6 or 7.

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