JP2023044259A - Chair - Google Patents

Abstract

To provide a chair capable of satisfactorily suppressing a damage of appearance caused by visual recognition of a screw.SOLUTION: The chair comprises a lower frame material cover Q which is attachable and detachable to and from a back frame constituting a backrest and is attached to a normal fitting position with respect to the back frame in a case where a head vt of a screw v is positioned at a deep wall u1 of the back frame. The lower frame material cover Q comprises a lower frame cover body q1 and a concealment body q2 which projects from the lower frame cover body q1 and can conceal the head vt of the screw v to be invisible from the outside while locking with the head vt of the screw v.SELECTED DRAWING: Figure 39

Description

The present invention relates to chairs.

2. Description of the Related Art Conventionally, there has been known a chair in which a backrest is attached to a back support that is rotatably supported with respect to a support base using attachment screws (see Patent Document 1, for example).

In this type of chair, there are various types of chairs in which a plate-shaped cap material is used to hide the mounting screws so that the screws are not exposed on the back side of the backrest.

However, since the conventional cap material is a relatively small part, it causes an increase in the number of parts required for manufacturing the chair, and is not preferable in terms of management during manufacturing.

In addition, conventional chairs have a structure in which it is difficult to easily confirm whether or not the backrest is properly screwed to the back support. It was a thing.

JP 2020-69349 A

The present invention has been made in view of the circumstances as described above, and is capable of suitably suppressing at least the deterioration of the appearance due to visible screws, and an increase in the number of parts. To provide a chair having a structure that enables confirmation of whether or not screws are properly attached to a backrest without causing a failure.

That is, the present invention has the following configurations.

According to a first aspect of the invention, there is provided a chair in which a backrest is supported by a support base through a back support, wherein the backrest has a screw insertion hole and is attached to the back support by screws. The backrest base is provided with a positioning portion for positioning the head of the screw, the backrest base is detachable from the backrest base, and the screw head of the backrest is positioned in the positioning portion, the cover body is mounted in a normal mounting position with respect to the backrest base, and the cover body includes a cover body and a cover body protruding from the cover body. and a concealing body which is provided and is in contact with the head of the screw and can conceal the head of the screw from the outside so that it cannot be seen.

According to the second aspect of the invention, when the screw is inserted into the screw insertion hole and the head of the screw is not positioned in the positioning portion, the concealer is positioned at the head of the screw. 2. The chair according to claim 1, wherein the chair cannot be hidden from the outside.

According to a third aspect of the invention, when the screw is not inserted into the screw insertion hole, a gap of a certain width can be formed between the edge of the cover body and the backrest base. 3. A chair according to claim 1 or 2.

According to a fourth aspect of the present invention, the backrest base is penetrated through a recess that is open rearward and has a back wall as the positioning portion, and an upper wall portion that can form the recess, and the shielding body is provided. 4. The chair according to claim 1, 2 or 3, further comprising a through hole through which the chair can pass.

According to a fifth aspect of the invention, the backrest base has a lower base portion extending in the front-rear direction and having a portion connected to the back support, and the cover body includes the lower base portion. 5. The chair according to claim 1, 2, 3 or 4, which covers the upper side of the base portion.

The invention according to claim 6 is the chair according to claim 5, wherein the cover body has a front cover part extending from the front end part of the cover main body and covering the front side of the lower base part. .

According to a seventh aspect of the invention, the screw insertion holes are provided in a pair on the left and right, and the shielding bodies are paired on the left and right corresponding to the screws inserted through the screw insertion holes. 7. A chair according to claim 1, 2, 3, 4, 5 or 6, provided as a .

The invention according to claim 8 is characterized in that the shielding body is provided vertically from the cover body so that the back side can be visually recognized, and the shielding body is provided on the front side of the shielding body and has a front end of the screw. 8. The chair according to claim 1, 2, 3, 4, 5, 6, or 7, further comprising a head engaging portion that can be engaged with the head.

According to a ninth aspect of the invention, the backrest base is a back frame capable of supporting a tension member on which the backrest surface is formed. chair.

According to the tenth aspect of the invention, the back support member extends in the front-rear direction and couples a pair of left and right arms pivotally supported to the support base through a shaft, and the rear portions of the pair of left and right arms. 10. The chair according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9, further comprising a coupling member, wherein said coupling member is provided with a nut portion into which said screw can be screwed. is.

As described above, according to the present invention, at least, it is possible to preferably suppress deterioration of the appearance due to the screw being visible, and the screw can be supported without increasing the number of parts. It is possible to provide a chair having a configuration that allows confirmation of whether it is properly attached to the chair.

1 is a perspective view showing one embodiment of the present invention; FIG. The front view in the same embodiment. The rear view in the same embodiment. The right side view in the same embodiment. The top view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The exploded front view of the seat in the same embodiment. The bottom view of the seat main body in the same embodiment. FIG. 14 is a sectional view along the line AA in FIG. 14; FIG. 14 is a cross-sectional view along the line BB in FIG. 14; FIG. 4 is an exploded right side view of the seat body in the same embodiment; The top view which shows the positional relationship of the seat support and support member (seat main body) in the same embodiment. The top view which shows the positional relationship of the seat support and support member (seat main body) in the same embodiment. The left side view which shows the positional relationship of the seat support and the support member (seat main body) in the same embodiment. The left side view which shows the positional relationship of the seat support and the support member (seat main body) in the same embodiment. The disassembled perspective view in the same embodiment. The partial expansion perspective view in the same embodiment. The partial enlarged front view in the same embodiment. FIG. 2 is a partially enlarged rear view of the same embodiment; The partial enlarged left side view in the same embodiment. The partial expansion perspective view in the same embodiment. The front view for demonstrating the structure of the tension member in the same embodiment. FIG. 4 is a partially enlarged front view for explaining the structure of the upholstery member in the same embodiment; CC line sectional view in FIG. The partial enlarged front view which fractured a part of tension member in the same embodiment. The partial enlarged plan view of the regulation mechanism in the same embodiment. FIG. 32 is a sectional view taken along line DD in FIG. 32; The partial expansion perspective view of the regulation mechanism in the same embodiment. The top view of the lower frame material cover (cover body) in the same embodiment. The front view of the lower frame material cover (cover body) in the same embodiment. The bottom view of the lower frame material cover (cover body) in the same embodiment. The back view of the lower frame material cover (cover body) in the same embodiment. EE line sectional view in FIG. FF line cross-sectional view in FIG. FIG. 39 is a cross-sectional view corresponding to FIG. 39 for explaining the posture of the lower frame member cover (cover body) in the same embodiment; FIG. 39 is a cross-sectional view corresponding to FIG. 39 for explaining the posture of the lower frame member cover (cover body) in the same embodiment;

An embodiment of the present invention will now be described with reference to FIGS. 1-42.

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

The chair comprises legs A, a support base B pivotally supported with respect to the legs A, a seat C arranged on the support base B, and a back support D with respect to the support base B. It is provided with a backrest E supported so as to be able to tilt, and a lumbar support R attached to the backrest E.

The chair is provided with a backward tilting degree setting mechanism X between the support base B and the back support D, which can set the backward tilting degree of the backrest E. The chair has a lower cover body I that covers the lower side of the back support D and the rotating member x2 that constitutes the backward tilting degree setting mechanism X. As shown in FIG.

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 distal ends, and a leg strut a2 erected from the base ends of the leg blades a1.

<<Support Base B>>
The support base B supports the seat C and the backrest E. The support base B is mainly composed of a support base main body 1 which is an integrally molded article made of synthetic resin and is open upward. The support base main body 1 is connected to the upper end of the leg support a2.

The support base B includes an elongated front shaft support MS capable of slidably supporting the front shaft jk2. The support base B can support the front portion of the seat C via the front shaft jk2.

The support base body 1 rotatably supports a reaction force adjustment lever 11 that can adjust the reaction force against the backward tilting motion of the backrest E by expanding and contracting the reaction force spring HG housed in the support base body 1 . It is

<<Seat C>>
The seat C is arranged on the support base B. The seat C includes a synthetic resin seat support c1 also called an outer shell, a seat main body c2 having a seating surface and supported by the seat support c1, and a space between a position above and a position below the seat main body c2. and an operating member c3 which can move the seat body c2 in the longitudinal direction when it is in the upper position.

A plurality of regulation mechanisms V are provided between the seat support c1 and the seat body c2 to regulate the movement range of the seat body c2 in the front-rear direction. The regulating mechanisms V are provided at a total of four locations, two each at the front and rear, between the seat support c1 and the seat main body c2.

The front portion of the seat C is movably supported with respect to the support base B via the front shaft jk2. The central portion of the seat C in the front-rear direction is supported by the support base B via the back support D holding the rear shaft jk3. The central portion of the seat C in the front-rear direction is rotatably supported with respect to the rear shaft jk3.

<Seat c1>
The seat support c1 has a shell shape having a size capable of supporting the seat body c2 at its upper portion.

The seat support c1 has a slightly curved shape in which the front portion is convex rearward in a plan view or a bottom view. The seat support c1 has a curved shape such that the rear portion thereof is convex rearward in plan view or bottom view. The seat support c1 has four rounded corners, and has a generally laterally long rectangular shape as a whole.

As shown in FIGS. 19 and 21, the seat support c1 has a front position (F) in which the front portion of the seat body c2 protrudes farther forward than the front edge of the seat support c1 in plan view or bottom view. As shown in 18 and FIG. 20, the seat body c2 can be slidably supported in the longitudinal direction between the front position (F) and the rear position (N) located behind the front position (F).

The seat support c1 includes a seat support main body ca that constitutes a shell-shaped main part capable of supporting the seat main body c2 at the upper part, and four substantially T-shaped retaining projections projecting upward from the seat support main body ca. W. The retaining projection W constitutes a restricting mechanism V. As shown in FIG. In this embodiment, the seat receiving main body ca and the retainer projection W are integrally formed of synthetic resin.

[Seat support body ca]
The seat support body ca includes a seat support base c10 having an upper surface formed with a lower support region L that can be in contact with the lower surface of the support member main body c211, and a seat support base c10 provided at the center in the left-right direction of the front portion of the lower surface side of the seat support base c10. The front downwardly extending wall c11 is paired with the seat support base c10 at the center in the left-right direction on the lower surface side and extends downward from both ends of the front downwardly extending wall c11. The left and right downwardly extending walls c12 provided, and the downwardly extending walls provided at the center in the left-right direction of the rear portion of the lower surface side of the seat support base c10 and provided so as to connect the rear portions of the left and right downwardly extending walls c12. c13.

The seat support base c10 is provided with a plurality of exposed ribs extending in the front-rear direction and the left-right direction for ensuring rigidity on the upper surface side. The seat support base c10 is formed with a lower support area L that can come into contact and slide contact with the lower surface of the support member main body c211 by the upper ends of the ribs that stand on the upper surface side.

The lower receiving region L forms a portion with which the lower surface of the support member main body c211 can contact and slide. When the seat body c2 slides in the longitudinal direction, the lower surface of the support member body c211 can come into sliding contact with the lower receiving region L. As shown in FIG. The lower receiving region L has a curved shape such that the central portion is positioned lower than the outer portions when viewed from the front and rear.

Both side edges of the seat support base c10 extend substantially linearly in the front-rear direction. Upper end portions y1 at both side edges of the seat support base c10 constitute the uppermost portion of the seat support main body ca.

When the seat main body c2 is at the rear position (N), the front portions of the upper end portions y1 of the left and right side edges of the seat support base c10 are positioned on the left and right side portions cf of the front portion of the support member c21. It is disposed at a position intersecting the wall c214.

On the other hand, when the seat main body c2 is in the front position (F), the rear portions of the upper end portions y1 of the left and right side edges of the seat support base c10 are positioned on the left and right side portions cr of the rear portion of the support member c21. It is disposed at a position intersecting with the support wall c214.

The front right portion of the seat support base c10 is provided with a seat support slit cs that penetrates in the vertical direction and extends in the front-rear direction in which the operation member c3 is disposed.

On the lower surface side of the front left portion of the seat support base c10, an operation piece CH is pivotally supported so as to operate the leg support a2 in the vertical direction by acting on a gas spring (not shown) constituting the leg support a2 so that the leg support a2 can be expanded and contracted. ing.

A rear shaft holding portion ce capable of rotatably holding the rear shaft jk3 is provided in the front-rear direction central portion of the lower surface side of the seat support base c10. The rear axle holding portion ce is provided between the left and right downwardly extending walls c12 of the seat support base c10 in bottom view.

[Retaining protrusion W]
The retaining projection W constitutes a restricting mechanism V. As shown in FIG. The retaining projections W are erected at four locations on the seat support body ca so as to correspond to the guide portions J provided at four locations on the support member c21. The retaining projection W is erected on the seat support body ca and has a substantially T-shaped appearance when viewed from the front and from the rear.

The retainer projection W is engaged with a guide portion J provided on the support member c21 of the seat body c2 to support the seat body c2 in a non-separable manner with respect to the seat support c1, and to hold the seat body c2 relative to the seat support c1. can be positioned so as to be slidable back and forth.

The details of the retainer projection W that constitutes the restriction mechanism V will be described later.

<Seat body c2>
The seat body c2 is configured to be slidable in the longitudinal direction between the front position (F) and the rear position (N) with respect to the seat support c1.

The seat main body c2 is supported by a shell-shaped support member c21 which is larger in longitudinal and lateral dimensions than the seat support c1, and is supported by the support member c21 and is larger in longitudinal and lateral dimensions than the support member c21. and a seat cushion c23 covering the peripheral edge portions of the seat cushion c22 and the support member c21 from the outside.

When the seat main body c2 is at the rear position (N), the left and right corners cx of the front portion of the seat support c1 are positioned closer to each other than the left and right corners cz of the front portion of the support member c21 in plan view or bottom view. It is located on the front side.

That is, in the seat body c2, at the rear position (N), the edge y3 of the central portion in the lateral direction of the front portion of the support member c21 is substantially the same as the edge portion y4 of the central portion in the lateral direction of the front portion of the seat support c1. It is configured to be positioned at the front-rear direction position.

Further, in the seat body c2, at the rear position (N), the front end portions y5 of the left and right side portions of the front portion of the support member c21 are positioned behind the front end portions y6 of the left and right side portions of the front portion of the seat support c1. is configured to

When the seat main body c2 is in the front position (F), the rear edge of the seat support c1 is located behind the rear edge of the support member c21 in plan view or bottom view. .

[Support member c21]
The support member c21 is made of synthetic resin and is also called an inner shell. The support member c21 is attached to the lower surface of the seat cushion c22 and plays a role of evenly supporting the load of the seated person.

The support member c21 has a curved shape such that the central portion is positioned lower than the outer portion when viewed from the front and rear.

The support member c21 has a curved shape in which the front portion is convex forward in a plan view or a bottom view. The support member c21 has a curved shape such that the rear portion thereof is convex rearward in plan view or bottom view. The support member c21 has four rounded corners, and has a substantially oblong rectangular shape as a whole.

In this embodiment, the degree of curvature of the front portion of the support member c21 is set to be greater than the degree of curvature of the front portion of the seat support c1. The degree of curvature of the rear portion of the support member c21 is set to be substantially the same as or very close to the degree of curvature of the rear portion of the seat support c1.

That is, the outer edge shape of the front portion of the support member c21 is different from the outer edge shape of the front portion of the seat support c1. On the other hand, the outer edge shape of the rear portion of the support member c21 is similar to the outer edge shape of the rear portion of the seat support c1.

The support member c21 has a support member main body c211 disposed in the central portion in the front-rear direction and the left-right direction, and a stepped portion c212 extending outward from the peripheral edge portion of the support member main body c211. and a support wall c214 provided so as to protrude downward along the entire circumference of the outer peripheral edge of the peripheral wall c213.

The support member main body c211 has a relatively flat plate-like shape, and is configured to flexibly bend under the load of the seated person. The support member main body c211 is provided at the center in the front-rear direction so as to extend in the front-rear direction, and constitutes a plurality of seat center slits c215 provided in the left-right direction corresponding to the concave portions c222 of the seat cushion c22, and the restriction mechanism V. A guide portion J extending in the front-rear direction with which the retaining projection W provided on the seat support c1 can be engaged, and an operation member c3 vertically penetrating and capable of supporting the operating member c3 so as to be able to move up and down but not to come off downward. A member holding hole c216 is provided.

Details of the guide portion J will be described later.

The peripheral wall portion c213 is located outside the supporting member main body c211 and arranged above the supporting member main body c211. The stepped portion c212 interposed between the support member main body c211 and the peripheral wall portion c213 is for positioning the peripheral wall portion c213 above the support member main body c211. In this embodiment, the stepped portion c212 is mainly composed of a wall portion erected on the outer peripheral edge of the support member main body c211.

The peripheral wall portion c213 is arranged so as to surround the outside of the support member body c211 in bottom view. The edge y2 of the seat upholstery c23 is arranged on the lower surface side of the peripheral edge wall c213.

The support member c21 has a downwardly open space surrounded by a peripheral wall portion c213, a stepped portion c212, and a support wall c214 in a substantially downward U-shape and capable of accommodating the edge y2 of the seat cushion c23. sr is formed.

Hooking pieces cn for hooking the edge y2 of the upholstery c23 are provided at the four corners of the peripheral wall c213 and at the central portions in the left-right direction of the front and rear portions of the peripheral wall c213. there is

The support wall c214 is provided around the entire periphery of the outer peripheral edge of the support member c21 and has a shape that protrudes downward. The support wall c214 has a wall shape extending downward from the outer peripheral edge of the peripheral wall portion c213.

The support wall c214 plays a role of stably holding the peripheral edge portion G of the seat cushion c22 in cooperation with the seat upholstery c23, and the outer surface sm is inside the vertical portion c221 which is the inner surface of the seat cushion c22. It can be attached to the side surface sn.

In this embodiment, the vertical dimensions of the support walls c214 located at the front and rear portions of the support member c21 are set so as not to interfere with the seat support c1. More specifically, the vertical dimension of the support wall c214 formed in the entire front portion of the support member c21 (left and right side portions cf and regions therebetween) is shorter than the vertical dimension of the support wall c214 in other portions. is set.

In addition, the support wall c214 of the other part can include the support wall c214 located in the front-back direction center part in the right-and-left both sides of the support member c21.

Left and right side portions cf of the front portion of the support member c21 (that is, left and right corner portions of the front portion of the support member c21) are set at positions in the left-right direction that coincide with both side end portions of the seat support body ca in a front view. ing. Upper end portions y1 at both side end portions of the seat support body ca constitute the uppermost portion of the seat support body ca.

That is, the support wall c214 of the support member c21 extends vertically as a whole in order to stably hold the peripheral edge portion G of the seat cushion c22 in cooperation with the seat upholstery c23. When the body c2 slides in the front-rear direction, in order to prevent it from interfering with the upper end y1 on both side ends of the seat support body ca, the vertical dimensions of the portions located on the left and right side portions cf of the front portion are extremely large. is set to be short.

In addition, the support wall c214 of the support member c21 is such that the vertical dimension of the portions located in the left and right side portions cr in the rear portion is set short similarly to the left and right side portions cf in the front portion.

The height of the support wall c214 located in the left and right side portions cf in the front portion of the support member c21 and set relatively short in vertical dimension compared to other portions is the height of the rear, that is, the front and rear of the left and right side portions of the support member c21. It returns gently so that it may become high gradually toward the center part of the direction.

The height of the support wall c214 located in the left and right side portions cr at the rear portion of the support member c21 and having a relatively short vertical dimension compared to other portions is set at the center of the rear end portion of the support member c21 in the left-right direction. It gently returns so that it gradually rises toward the part.

[Seat cushion c22]
The seat cushion c22 is mainly made of urethane foam, which is a foam material. A support member c21, which is a shell-shaped member, is attached to the lower surface of the seat cushion c22. In a bottom view, the outer edge shape of the seat cushion c22 has a shape similar to the outer edge shape of the support member c21.

The seat cushion c22 has a shape that can be fitted onto the support member c21 from above.

The seat cushion c22 has a larger shape than the support member c21 in bottom view. In other words, the longitudinal and lateral dimensions of the seat cushion c22 are set longer than the longitudinal and lateral dimensions of the support member c21.

A peripheral edge portion of the seat cushion c22 is provided with a vertical portion c221 having an inner surface sn which is an inner surface that can be in contact with the outer surface sm of the support wall c214. The hanging portion c221 is a portion that hangs downward at the peripheral portion of the seat cushion c22. The vertical portion c221 is arranged outside the support wall c214.

A peripheral edge portion G including the vertically provided portion c221 of the seat cushion c22 has a shape that protrudes outward from the support member c21. In other words, the peripheral portion G of the seat cushion c22 overhangs the support member c21.

In addition, a plurality of recesses c222 opened downward corresponding to the seat center slits c215 provided in the support member c21 are provided in the front-back direction central portion of the lower surface side of the seat cushion c22.

[Upholstery c23]
The seat upholstery c23 is mainly made of elastic fabric. The seat upholstery c23 can cover the upper surface, the outer surface of the seat cushion c22, and the lower surface of the peripheral edge portion G (the lower surface of the vertical portion c221) from the outside, and is provided so as to hang down from the peripheral edge of the support member c21. The support wall c214 thus formed can be covered from the space sr side.

The seat upholstery c23 wraps the seat cushion c22 and the lower surface side of the peripheral portion of the support member c21, and the end edge y2 is tightened by a string member (not shown), thereby tightening the seat cushion as a whole. c22 and support member c21.

That is, the edge y2 of the seat upholstery c23 is narrowed in the direction in which the opening formed by the edge y2 is narrowed (the direction in which the diameter is reduced). The edge y2 of the seat upholstery c23 after the operator has finished narrowing it down is arranged under the peripheral edge wall c213 of the support member c21 so as to be hooked on the hook cn.

The peripheral edge portion G of the seat cushion c22, particularly the vertical portion c221 of the seat cushion c22 located outside the support wall c214, receives a tensile force in the direction of the edge y2 by the taut seat upholstery c23 and is supported. It is in close contact with the wall c214 and stably supported.

In particular, in this embodiment, the degree of curvature of the front portion of the support member c21 is set to be greater than the degree of curvature of the front portion of the seat support c1, so that the seat upholstery c23 wrinkles the peripheral edge portion G of the seat cushion c22. It is easy to wrap in a well-balanced manner while suppressing the appearance of .

That is, since the left and right corners cz of the support member c21 are less angular than the corners cx of the seat support c1, the edge y2 of the seat upholstery c23 forms a substantially annular shape on the bottom surface side of the support member c21. Even when the seat cushion c22 is narrowed down in this way, it is difficult to cause an imbalance in the squeeze pressure with respect to the peripheral edge portion G of the seat cushion c22. As a result, the seat body c2 of this embodiment has a structure in which wrinkles are less likely to occur on the outer surface side of the seat cushion c22.

Moreover, on the inner surface side of the seat upholstery c23, the vertical portion c221 of the peripheral edge portion G of the seat cushion c22 is preferably backed and supported by the support wall c214 of the support member c21. Due to the presence of , unevenness caused by the tension of the upholstery c23 is less likely to appear.

Further, the lower edge of the support wall c214 is pressed against the upholstery c23. Therefore, gather-like wrinkles generated at the edge y2 of the seat upholstery c23 are preferably blocked by the lower edge of the support wall c214, and are less likely to affect the seat cushion c22.

Therefore, in the seat C of this embodiment, when viewed from the front side, the appearance of the seat main body c2 located near the upper end of the seat support c1 is suppressed from appearing unevenness, wrinkles, etc., and has a good appearance. It is something that can be done.

In other words, the seat body c2 in this embodiment is configured so that the lower end looks good when viewed from the front.

<Operating member c3>
The operating member c3 is supported so as to be vertically movable between an upper position and a lower position with respect to the seat body c2. The lower end, which is the operating end of the operating member c3, is exposed below the seat support c1 through the seat support slit cs.

When no load is applied, the operating member c3 is positioned at the lower position by receiving the biasing force of the seat cushion c22. The operation member c3 can receive the operation force of the user and change its position to the upper position against the biasing force of the seat cushion c22.

The operating member c3 can position the seat body c2 at a predetermined position on the seat support c1 when it is in the lower position. On the other hand, when the operation member c3 is in the upper position, the restraint on movement in the front-rear direction with respect to the seat support c1 is released, and the seat main body c2 can be slid in the front-rear direction with respect to the seat support c1. It has become.

<Regulatory organization V>
The regulating mechanisms V are arranged at four locations, left and right on the front side and left and right on the rear side of the seat support c1 and the support member c21. Each of the four restricting mechanisms V includes a retainer protrusion W on the seat support c1 and a guide portion J provided on the support member c21 and extending in the front-rear direction with which the retainer protrusion W can be relatively movably and non-separably engaged. is mainly composed of

[Retaining protrusion W]
The retaining projection W has a columnar standing portion w1 extending in the vertical direction, and a retaining portion w2 provided at the tip of the standing portion w1 and having a width larger than that of the standing portion w1. The retaining projection W has a substantially T-shape when viewed from the front or from the rear.

The upright portion w1 is in the shape of a quadrangular prism, and its proximal end portion is integrally connected to the seat support base c10.

The retaining portion w2 is in the shape of a substantially rectangular block elongated in the left-right direction. A center portion in the left-right direction of the retainer portion w2 is integrally connected to the upper end portion of the upright portion w1.

When the seated person sits on the seat C and slides the seat main body c2 in the front-rear direction, the support member main body c211 is flexurally deformed, so that the lower surfaces of the left and right ends of the retaining portion w2 are displaced. , and the upper surfaces of the left and right extension portions j2 of the corresponding guide portion J, respectively.

[Information part J]
The guide portions J are provided at four front and rear corner portions of the support member main body c211. The guide portion J has a guide slit j1 extending in the front-rear direction and capable of guiding the upright portion w1 so as to be relatively movable in the front-rear direction. It has left and right along-line portions j2 that can be fitted together, and an upright wall portion j3 surrounding the guide slit j1 and the along-line portions j2.

The along portion j2 includes a along portion main body j21 extending in the front-rear direction and a convex portion j22 projecting from the along portion main body j21.

The along portion main body j21 has a substantially plate shape extending in the front-rear direction.

The convex portion j22 can slide against the lower surface of the retaining portion w2 of the retaining projection W. As shown in FIG. The convex portion j22 is provided on each of the left and right side portions j2. The convex portion j22 has a substantially semicircular shape in a cross-sectional view, and has a rail shape extending in the front-rear direction. Two convex portions j22 are provided so as to be parallel to each other with respect to the main portion j21.

Grease or the like, which is a lubricant, can be preferably accumulated between the convex portions j22 protruding parallel to the main body j21.

The inventors of the present invention have found a problem with the conventional chair that "when the seat body is slid in the front-rear direction, an abnormal noise may be generated due to the sliding of some members." As a result of searching for a solution to the problem, the inventors found that "the retainer portion of the retainer projection and the portion along the guide portion are tightly attached in a no-load state in which the occupant is not seated on the seat body. When the occupant sits on the seat body even though it is not engaged with the seat body, the retaining part and the peripheral part are tightly engaged due to the bending deformation of the support member body. There is a case to do.” Then, the inventors came to the knowledge that "an abnormal noise may be generated when the retaining portion and the along-side portion are tightly engaged with each other."

In this embodiment, a protruding portion j22 is provided on the along-line portion j2 of the guide portion J that constitutes the regulating mechanism V. As shown in FIG. Therefore, even when the seat body c2 is slid in the front-rear direction while the seated person is seated on the seat C, the protruding portion j22 and the portion j2 along the lower surface of the retainer portion w2 are not in contact with each other. contact only point-wise, and the occurrence of abnormal noise and poor slippage due to surface-to-surface contact can be favorably avoided.

For this reason, with the configuration of the regulation mechanism V of this embodiment, not only is it less likely that abnormal noise will be generated when the seat body c2 slides, but the seat body c2 can be slid smoothly with respect to the seat support c1. It can be moved.

<<back support D>>
The back support D is interposed between the support base B and the backrest E and between the support base B and the seat C. As shown in FIG. The back support D includes a rear shaft jk3 extending in the left-right direction and engaged with a rear shaft holding portion ce provided on the seat support c1 of the seat C. As shown in FIG.

The back support D has the shape of an upright plate extending in the front-rear direction, and is provided with a pair of left and right arms d1 pivotally supported on the support base main body 1 of the support base B via a main shaft jk1, and between the rear portions of the pair of left and right arms d1. a connecting member d2 in the shape of an upright plate that connects the pair of left and right arms d1, a rear shaft jk3 that extends in the left and right direction supported by a portion on the front side of the main shaft jk1 of the pair of left and right arms d1, and a rear shaft jk3 that extends in the left and right direction from the pair of left and right arms d1 It comprises a pair of left and right receiving shaft support members d3 arranged on the central side and having an upper portion connected to the rear shaft jk3, and a receiving shaft d4 connected between the lower portions of the pair of left and right receiving shaft support members d3. .

<Left and right arms d1>
The left and right arms d1 are made of metal. The left and right arms d1 are in the form of standing walls having left and right arm main bodies d11 which are portions extending in the front-rear direction. The left and right arms d1 are arranged outside the left and right side walls 14 of the support base body d1.

The left and right arms d1 have left and right arm main bodies d11 extending in the front-rear direction and capable of supporting the main shaft jk1 at the front ends thereof. Left and right front arm portions d12 for supporting the rear shaft jk3 engaged with C, and main shaft insertion penetrating in the left-right direction provided between the left and right arm bodies d11 and the left and right front arm portions d12 and capable of holding the main shaft jk1. and a hole d13.

The left and right arm bodies d11 extend substantially linearly in the front-rear direction. The rear portions of the left and right arm bodies d11 are connected by a connecting member d2. The rear ends of the left and right arms d11 protrude behind the connecting member d2, and the protruding portion dt is fitted in the back support connecting portion 41 provided on the lower frame member 4 of the backrest E. It is possible.

Axial holes (not shown) penetrating in the left-right direction are provided in front of the portions of the left and right arm bodies d11 to which the connecting members d2 are secured, and the rearward tilting degree setting levers x1 are rotatable in these shaft holes. Supported.

<Coupling member d2>
The coupling member d2 is made of metal. The coupling member d2 is in the shape of an upright plate extending in the left-right direction. The left and right ends of the coupling member d2 are rigidly welded to the inner portions of the left and right arms d1.

The coupling member d2 is provided with a nut portion nt to which a screw v for attaching the backrest E is screwed.

In addition, the back support D has a backrest mounting portion configured in an H shape in a plan view or a bottom view by the rear portions of the left and right arms d1 and the connecting member d2 connecting the rear portions of the left and right arms d1. formed.

<Rear axle jk3>
The rear shaft jk3 extends in the left-right direction and is connected to the upper end portions of the left and right front arm portions d12.

<Right and left bearing shaft support members d3>
The left and right receiving shaft support members d3 support the receiving shaft d4 that is pressed by the reaction spring HG. The left and right receiving shaft support members d3 rigidly connect both ends of the receiving shaft d4 at their lower ends.

<Receiving shaft d4>
The receiving shaft d4 extends in the left-right direction and is arranged inside the support base main body 1. As shown in FIG. The receiving shaft d4 constitutes a portion that directly receives the biasing force of the reaction force spring HG disposed on the support base B. As shown in FIG.

<<lower cover body I>>
The lower cover body I is an integrally molded article made of synthetic resin that is attached to the back support body D. As shown in FIG. The lower cover body I includes left and right arm cover portions i1 that cover the front portions of the pair of left and right arms d1 from below, and rear end portions of the left and right arm cover portions i1 that are connected to the rear ends of the left and right arm cover portions i1. a rear cover portion i2 that covers the back cover portion i2, and a rear engagement that is erected from the rear edge of the rear cover portion i2 and that engages with the upper edge while being in contact with the rear surface of the central portion in the left-right direction of the connecting member d2 of the back support D. It has a claw i3.

A front engaging claw i11 that engages with the upper ends of the pair of left and right arms d1 is provided at the upper end of the central portion of the arm cover portion i1 in the front-rear direction.

The rear cover portion i2 hides the rotating member x2 disposed between the rear portions of the pair of left and right arms d1 so as not to be visually recognized from the outside.

The rear engaging claw i3 has its upper end hooked on the upper edge of the connecting member d2 and is sandwiched between the lower frame member 4 of the back frame M and the connecting member d2.

The lower cover body I is preferably attached to the back support D in a manner that is difficult to come off because the front engaging claws i11 and the rear engaging claws i3 respectively engage corresponding portions of the back support D. It has become.

<<Backward Tilt Setting Mechanism X>>
The backward tilting degree setting mechanism X sets the backward tilting degree of the backrest E, which is supported by the back support D with respect to the support base B so as to be capable of tilting backwards, from two or more by the user's operation. You can choose.

The backward tilt setting mechanism X includes a backward tilt setting lever x1 rotatably supported by the back support D, and a backward tilt setting lever x1 that is integrally rotatably attached to the backward tilt setting lever x1 to set a plurality of backward tilt degrees. and a rotary member x2 on which a plurality of corresponding contact surfaces are arranged.

<<Reclining Back E>>
The backrest E is composed of a back frame M, which is a backrest base portion having screw insertion holes h and is attached to the back support D with screws v, and a lower base portion of the back frame M, which is a member separate from the back frame M. and a mesh-like tension member P stretched on the back frame M.

<back frame M>
The back frame M has left and right side frame members 2 having upholstery member mounting grooves mz that open outward, and upholstery member mounting grooves mz that open upward to connect the upper portions of the left and right side frame members 2. An upper cavity sa is formed between the upper frame member 3, a lower frame member 4 connecting the lower portions of the left and right side frame members 2, and the upper frame member 3 having a tension member mounting groove mz opening downward. In addition, it has an intermediate connecting frame member 5 that connects the left and right side frame members 2 with a lower cavity sb formed between them and the lower frame member 4 .

In this embodiment, the left and right side frame members 2, the upper frame member 3, the lower frame member 4, and the intermediate connecting frame member 5, which constitute the back frame M, are integrally molded from synthetic resin. .

The back frame M comprises left and right side frame members 2 which are first frame members extending in a predetermined direction, that is, in the vertical direction, and is connected to the left and right side frame members 2 and intersects the left and right side frame members 2. an upper frame-shaped portion wa in which an upper cavity sa is formed inside by an upper frame member 3 which is a second frame member extending in the left-right direction and an intermediate connection frame member 5 extending in the left-right direction; A lower frame-shaped portion wb in which a lower cavity sb is formed by left and right side frame members 2, a lower frame member 4, and an intermediate connection frame member 5 is provided.

Corner portions K are formed between the left and right side frame members 2 and the upper frame member 3 that constitute the upper frame-shaped portion wa.

The backrest E is provided with a tension member P that can form a backrest surface pm only on the upper frame-shaped portion wa provided on the back frame M. As shown in FIG. On the other hand, the tension member P is not stretched on the lower frame-shaped portion wb.

[Left and right side frame materials 2]
The left and right side frame members 2 extend vertically. The left and right side frame members 2 have bent portions 23 in their vertical intermediate portions, and have a substantially "<" shape when viewed from the side.

On the outer surfaces of the left and right side frame members 2, tension member mounting grooves mz are formed that extend from the upper ends of the side frame members 2 to a height position substantially corresponding to the lower edge of the intermediate connection frame member 5. As shown in FIG. A tension member P is stretched between the left and right side frame members 2 extending in the vertical direction.

The left and right side frame members 2 are composed of an outer frame portion 21 having a tension member mounting groove mz that opens outward, and a front portion positioned inside the outer frame portion 21 behind the front portion of the outer frame portion 21. and a positioned inner frame portion 22 .

In the vertical intermediate portion of the left and right side frame members 2, which is the height position corresponding to the waist of the seated person, more specifically, in the vertical intermediate portion of the inner frame portion 22 of the left and right side frame members 2, A lumbar support holding portion N is provided which can hold the lumbar support R so that its vertical position can be changed.

[Upper frame material 3]
The upper frame member 3 extends in the left-right direction. The upper frame member 3 includes an outer frame portion 31 formed with a tension member mounting groove mz that opens upward for mounting the tension member P, and an inner frame portion 32 arranged below the outer frame portion 31. ing.

The end accommodation space zs of the upholstery member P formed by the upholstery member mounting groove mz of the upper frame member 3 is the end accommodation space zs of the upholstery member P formed by the upholstery member mounting grooves mz of the left and right side frame members 2. It is connected with In other words, the corners K provided between the upper frame member 3 and the left and right side frame members 2 are also formed with end accommodation spaces zs.

[Configuration of Corner K]
At the corner K of the back frame M, the outer space side of the upper frame-shaped portion wa, that is, the outer space not surrounded by the upper frame-shaped portion wa, and the inner side, that is, the upper space surrounded by the upper frame-shaped portion wa. A through hole ka is provided to penetrate between the cavity sa side.

The through hole ka is provided at the central portion of the corner K in the thickness direction in the front-rear direction. The through hole ka extends obliquely so as to be positioned gradually inward downward.

The through hole ka has an upper opening kb located on the side of the external space not surrounded by the upper frame-shaped portion wa, and a lower opening kb located on the side of the upper cavity sa surrounded by the upper frame-shaped portion wa. and an opening kc. The upper opening kb is provided at a position facing the end accommodation space zs, and the lower opening kc is provided at a position facing the locking member disposing region ks provided at the lower front side of the corner K. is provided in

A concave portion hc is formed in the lower portion of the outer frame portion 31 of the upper frame member 3 at the portion corresponding to the corner portion K, the concave portion hc forming a concave shape toward the upper side. A spatial region obtained by the concave portion hc recessed upward serves as a locking member disposing region ks in which the locking member p3 provided on the tension member P is disposed. The locking member p3 arranged in the locking member arrangement region ks is almost invisible due to the tension member main body p1 stretched on the front side of the upper frame-shaped portion wa.

Locking members p3 provided on the tension member P are inserted into the through holes ka provided at the left and right corners K of the back frame M from the outside toward the inside. All or at least a part of the locking member p3 inserted into the through hole ka is prevented from slipping off or reversed by the lower opening kc after passing through the through hole ka, and is arranged in the locking member arrangement region ks. It has become so.

[Lower frame material 4]
The lower frame member 4 has a portion that connects the lower portions of the left and right side frame members 2 and connects to the back support D. As shown in FIG. Further, the lower frame member 4 is formed with a fitting frame portion 4w on the upper surface side into which the lower frame member cover Q is fitted.

The lower frame member 4 includes a lower outer wall 4a having an outer surface portion facing downward, left and right side outer walls 4b having an outer surface portion rising from both sides of the lower outer wall 4a and facing sideways, and the center of the lower outer wall 4a in the left-right direction. and a rear outer wall 4c having a rearwardly facing outer surface extending upwardly from the rear edge of the rear wall 4c.

The lower frame member 4 is surrounded by left and right front ends e1 of the lower outer wall 4a, front ends e2 and upper ends e3 of the left and right side walls 4b, upper ends e4 of the rear outer wall 4c, and front ends e5 of the horizontal ribs 2a. A fitting frame portion 4w is provided. A lower frame member cover Q can be fitted to the fitting frame portion 4w.

The horizontal rib 2a has a plate shape extending forward from the lower end portions of the left and right side frame members 2, and the front end portion e5 is positioned above the lower frame member 4. As shown in FIG.

The lower frame member 4 has a forwardly open recess that fits over the rear ends of the left and right arms d1 in a region surrounded by the lower outer wall 4a, the left and right side outer walls 4b, and the rear outer wall 4c. Left and right arm connecting portions 41 are provided.

The left and right arm connecting portions 41 include the lower outer wall 4a, the left and right intermediate standing walls 4d erected from the lower outer wall 4a, and the upper wall portions 4e extending inwardly from the upper ends of the left and right intermediate standing walls 4d. It is composed of

Next, the recess U provided in the lower frame member 4 will be described.

The recess U has a back wall u1 which is a screw engagement wall in which a screw insertion hole h is formed and which can be engaged with the head vt of the screw v, and an opening which is behind the back wall u1. A standing wall u2, which is a front wall positioned forward of uk, a peripheral wall u3 extending in the front-rear direction and facing the housing space sd on the inner surface side, and a surface extending in the front-rear direction and facing the screw housing space sd and standing up. It has an intermediate wall u4 that connects the outer end of the wall u2 and the inner end of the back wall u1.

The rearward surface of the inner wall u1 constitutes a positioning portion for positioning the head vt of the screw v. A pair of inner walls u1 having screw insertion holes h through which screws v are inserted are provided on the left and right sides. The inner wall u1 is formed with a screw insertion hole h penetrating in the front-rear direction at the center thereof. The front surface, which is the opposite surface of the back wall u1, is in contact with the rear surface of the connecting member d2 of the back support D. As shown in FIG. In other words, the back wall u1 also serves as a positioning wall for the head vt of the screw v and an engaging wall for the coupling member d2 of the back support D. As shown in FIG.

The upright walls u2 are provided inside the inner walls u1 provided on the left and right sides in a rear view. The upright wall u2 is longitudinal in the left-right direction and arranged in a posture substantially parallel to the back wall u1. The rear surface of the standing wall u2 forms a surface that is visually recognized when viewed from the rear. The standing wall u2 is set so as to be substantially flush with the outer surface of the shielding body q21 of the shielding body q2 in the lower frame member cover Q that has passed through the passage hole u32.

The peripheral wall u3 has an inner peripheral surface facing in a direction substantially perpendicular to the front-rear direction. A rear end portion of the peripheral wall u3 reaches the rear outer wall 4c, and an opening uk is formed in the rear outer wall 4c. The peripheral wall u3 includes an upper wall portion u31 located on the upper side. The upper wall portion u31 is provided with a pair of right and left through holes u32 at positions corresponding to the screw housing spaces sd. The passage hole u32 is vertically penetrated at a position facing the screw housing space sd, so that the shield q2 of the lower frame member cover Q can pass therethrough.

In other words, the recess U is provided in the central portion of the lower frame member 4 in the left-right direction and is open to the rear. The recess U is formed with a screw accommodating space sd capable of accommodating the head vt of the screw v for connecting the back frame M to the back support D. As shown in FIG. The screw v is inserted through the opening uk from the rear of the lower frame member 4 . The recess U is recessed forward when viewed from the rear side.

[Intermediate connection frame member 5]
The intermediate connection frame member 5 extends in the left-right direction. The intermediate connection frame members 5 are installed between the forwardly inclined parts of the left and right side frame members 2 in a side view.
The intermediate connection frame member 5 has a curved shape that protrudes rearward in a plan view. The intermediate connection frame member 5 is formed with a tension member mounting groove mz that opens downward.

<<Lower frame material cover Q>>
The lower frame member cover Q covers the upper side of the lower frame member 4 of the back frame M, which is the lower base portion of the backrest base.

The lower frame material cover Q is configured to be detachable from the back frame M. As shown in FIG. When the head vt of the screw v is positioned on the inner wall u1, which is the positioning portion provided on the lower frame member 4, the lower frame member cover Q is positioned at the normal mounting position with respect to the back frame M, that is, the fitting frame portion 4w. It is designed to be installed in a position where it fits into the

When the head vt of the screw v for connecting the back frame M and the back support D is properly regulated by the rear surface of the inner wall u1 of the lower frame member 4, the lower frame member cover Q is positioned at the lower frame member. It is constructed so that it can be properly fitted to a fitting frame portion 4w provided on the material 4. As shown in FIG.

The lower frame member cover Q includes a lower frame member cover body q1 that covers the upper surface side of the lower frame member 4, which is a lower base portion, and a lower frame member cover body q1 that protrudes downward from the central portion of the lower frame member cover body q1 in the front-rear direction. A shielding body q2 that engages with the rear portion of the head vt of the screw v and can conceal the head vt of the screw v from the outside, i.e., from the rear, invisibly, and extends downward from the front end portion of the lower frame member cover main body q1. A pair of left and right front cover portions q3 for covering the left and right front sides of the lower frame member 4 is provided.

<Lower frame material cover body q1>
The lower frame member cover main body q1 has a plate shape extending in the front-rear direction and the left-right direction.

The lower frame member cover main body q1 is provided at cover side end portions t3 corresponding to upper end portions e3 of the left and right side wall portions 4b forming the fitting frame portion 4w, and at upper end portions e4 of the rear wall portion 4c forming the fitting frame portion 4w. A corresponding cover center rear end portion t4 and cover left and right rear end portions t5 corresponding to front end portions e5 of the horizontal ribs 2a constituting the fitting frame portion 4w are provided.

Positioning protrusions q11 are vertically provided on the left and right sides of the rear portion of the lower frame cover main body q1, and have cylindrical lower ends whose lower ends can come into contact with the upper surfaces of lower horizontal ribs 4r provided on the left and right sides of the lower frame member 4. It is

Engagement projections q12 that can be engaged with the front ends e5 of the horizontal ribs 2a forming the fitting frame portion 4w are provided on the left and right rear edges of the lower frame member cover main body q1, that is, the left and right rear end portions t5 of the cover. there is

<Concealer q2>
The shielding body q2 is composed of a shielding body q21 which is in the form of a projecting piece vertically provided from the lower frame member cover body q1 and whose back side can be visually recognized, and a shielding body q21 which is provided on the front side of the shielding body q21 and whose front end is screw v. and a head engagement portion q22 that can be engaged with the head vt of the head.

The shielding bodies q2 are provided in pairs on the left and right so as to correspond to the screws v inserted through the screw insertion holes h of the back wall u1 provided in the recess U.

[Concealer body q21]
The shield main body q21 is a plate-like one elongated in the vertical direction and the horizontal direction, and the bottom edge thereof is formed in a substantially semicircular shape.

[Head engagement portion q22]
The head engaging portion q22 has a plate-like shape elongated in the vertical direction and the front-rear direction, and has an upper end connected to the lower frame member cover main body q1 and a rear end connected to the concealer main body q21. is set.

<Front cover portion q3>
The front cover portion q3 has a substantially triangular shape with a width gradually narrowing downward.

The front cover portion q3 corresponds to the cover lower end portion t1 corresponding to the left and right front end portions e1 of the lower outer wall 4a that constitutes the fitting frame portion 4w, and to the front end portions e2 of the left and right side wall portions 4b that constitute the fitting frame portion 4w. It has a front end t2 of the cover.

[Confirmation function for screw v based on position of lower frame cover Q]
When the screw v is inserted into the screw insertion hole h and the head vt of the screw v is not positioned on the rear surface of the back wall u1, which is the positioning portion, the lower frame member cover Q is The structure is such that the head vt of the screw v cannot be hidden from the outside.

As shown in FIG. 41, when the head vt of the screw v is not properly screwed into the back wall u1, the lower end of the shield q2 engages the upper end of the head vt. It will be. As a result, the shielding body q2 cannot be lowered to the proper position on the back side of the inner wall u1, and the peripheral edge of the lower frame member cover main body q1 to be fitted to the fitting frame portion 4w is , cannot be moved to a predetermined position. A worker who sees this state notices that the screw v is not properly screwed into the screw insertion hole h (the screwed state is insufficient; the screw v is not screwed in sufficiently). It is possible to do so.

Also, if the screws v are not inserted into the screw insertion holes h, the lower frame member cover Q will not be positioned at the predetermined position of the lower frame member 4 and will rattle. , a gap sk having a constant width can be formed between the edge of the lower frame member cover main body q1 and the base of the backrest.

As shown in FIG. 42, when the back frame M is attached to the back support D without inserting the screws v into the screw insertion holes h, the lower frame member cover Q is stabilized at the desired position. It is designed so that it is not possible to move it forwards and backwards and that any slippage in the fore-aft direction is evident. As a result, the peripheral edge portion of the lower frame member cover main body q1 becomes wobbly with respect to the fitting frame portion 4w (a state in which the gap sk easily appears). A worker who sees this state can notice that the screw v is not inserted into the screw insertion hole h.

<Upholstery member P>
The upholstery member P consists of a upholstery member main body p1 which is mainly made of a mesh-like fabric and can form a backrest surface pm, left and right side frame members 2 attached to the outer edge of the upholstery member main body p1, an upper frame member 3, and an upper frame member 3. Then, the band-shaped member p2 as a held member held in the tension member mounting groove mz provided in the intermediate connection frame member 5 and the through hole ka at the corner K of the back frame M are passed from the outside to the inside through the through hole ka. is provided with a locking member p3 that can be locked to the lower opening kc of the .

The tension member main body p1 is stretched on the front side of the upper frame-shaped portion wa of the back frame M and has a substantially rectangular shape when viewed from the front.

The belt-shaped member p2 is press-fitted into the tension member mounting groove mz together with the end portion of the tension member main body p1 during assembly. The belt-shaped member p2 is attached to the outer edge of the upholstery member main body p1 so as to substantially correspond to the substantially linear portions of the left and right side frame members 2, the upper frame member 3, and the intermediate connection frame member 5 when viewed from the front. It is The belt-like member p2 is made of synthetic resin and is sewn to the upholstery member main body p1 and extends substantially linearly when viewed from the front.

The belt-shaped member p2 is not sewn to the tension member main body p1 at the portion corresponding to the corner K of the back frame M.

The locking member p3 can be inserted into the through hole ka of the corner K and then locked to the lower opening kc of the through hole ka facing the upper cavity sa.

The engaging member p3 is formed of a piece-like or band-like cloth pa integrally extending from the tension member main body p1.

The locking member p3 is formed by folding and laminating a projecting piece-like or band-like cloth pa extending integrally from the tension member main body p1. More specifically, the locking member p3 is formed by folding back the strip-shaped cloth portion pa extending from the tension member main body p1 one or more times, and then forming a lump-like shape (laminated state) that appears by folding back. ) is sewn between the folded parts in order to maintain the

The locking member p3 is in the form of a mass that can be expanded and contracted. The locking member p3 is set to be temporarily compressed when passing through the through hole ka. After passing through the through-hole ka, the locking member p3 is released from the state of being clamped and compressed by the through-hole ka, and assumes a bulging shape than when passing through the through-hole ka. will return.

In the tension member P of this embodiment, the locking member p3 that has passed through the through hole ka of the corner K is less likely to return through the through hole ka. Therefore, the portion of the upholstery member P corresponding to the corner K has a suitable configuration that makes it difficult to separate from the corner K. As shown in FIG.

<< Lumbar Support R >>
The lumbar support R is detachably supported on the backrest E.

The lumbar support R is installed between the left and right side frame members 2 so as to be vertically changeable. The lumbar support R is positioned behind the upholstery member P and can support the lower back of the seated person.

The lumbar support R consists of a lumbar base RB, which is a single part that spans between the left and right side frame members 2 of the backrest E so that its position can be changed in the vertical direction, and the position of which can be changed in the horizontal direction with respect to the lumbar base RB. and a pair of left and right lumbar pads RP supported on each other.

The lumbar support R of this embodiment can be attached to the backrest E as an afterthought or removed from the backrest E by temporarily bending the components.

In the above-described embodiment, the chair has a structure that can appropriately prevent the deterioration of the appearance due to the screw v being visible by the concealer q2 projecting from the lower frame member cover Q. be able to provide.

Further, in the above-described embodiment, the seat body c2 can be suitably slid in the front-rear direction with respect to the seat support c1, and the seat body c2 stably provided with the seat cushion c22 larger than the support member c21. and can form a suitable appearance of the peripheral portion G of the seat body c2, especially a suitable appearance of the appearance of the front lower end portion of the seat body c2. becomes.

Further, according to the embodiment described above, it is possible to provide a chair having a suitable structure in which the corners K of the upper frame-shaped portion wa of the backrest E can support the upholstery member P.

Further, in the above-described embodiment, the seat main body c2 can be preferably moved back and forth with respect to the seat support c1, and the phenomenon of abnormal noise caused by the sliding contact between the seat main body c2 and the seat support c1 can be suppressed. It will be possible to provide a chair with a constraining configuration.

As described above, in the chair according to this embodiment, the support base B supports the backrest E through the back support D. As shown in FIG. The backrest E is provided with a back frame M which is a backrest base portion having screw insertion holes h and attached to the back support D with screws v. As shown in FIG. The back frame M has a back wall u1 as a positioning portion on which the head vt of the screw v is positioned. A lower frame member cover Q, which is a cover body that is detachable from the back frame M and is attached to the back frame M at a regular attachment position when the head vt of the screw v is positioned on the back wall u1, is provided. It is prepared. The lower frame member cover Q is composed of a lower frame member cover body q1 serving as a cover body and a lower frame member cover body q1 projecting downward from the lower frame member cover body q1. and a concealer q2 capable of concealing from the outside so as to be invisible.

Therefore, with the configuration according to the present embodiment, at least, it is possible to suitably suppress deterioration of the appearance due to the visible appearance of the screw v. It is possible to provide a chair with a structure that allows confirmation of whether v is properly attached to the backrest E.

In other words, the lower frame member cover body Q is detachable from the back frame M, and is attached to the back frame M at a regular attachment position only when the head vt of the screw v is positioned on the back wall u1. It is something to be gained.

Therefore, when the head vt of the screw v is not positioned on the back wall u1 (when the screw v is not sufficiently screwed into the back support D), the lower frame member cover Q The shielding member q2 cannot move to the desired position, and accordingly is not attached to the back frame M at the proper attachment position. With such a configuration, a suitable configuration is realized that can confirm whether or not the screw v is properly attached to the backrest E.

When the screw v is inserted into the screw insertion hole h and the head vt of the screw v is not positioned on the inner wall u1, the cover q2 hides the head vt of the screw v from the outside so that it cannot be visually recognized. It has a configuration that does not work.

Therefore, depending on whether or not the concealer q2 cannot conceal the head vt of the screw v invisibly from the outside, the screw v can properly screw the back frame M to the back support D. It is possible to determine whether or not it is worn.

When the screw v is not inserted into the screw insertion hole h, the cover side end portion t3, the cover center rear end portion t4, and the cover left and right rear end portions t5, which are the edge portions of the lower frame member cover main body q1. A gap sk having a constant width can be formed between the fitting frame portion 4w of the back frame M and the fitting frame portion 4w.

For this reason, even if the screws v are not inserted into the screw insertion holes h, the back frame M can be fixed to the back by relying on the relative positional deviation between the lower frame member cover Q and the back frame M. It can be determined that the support D is not properly attached.

The back frame M is provided with a recess U having a rear wall u1 that is open rearward and serving as a positioning portion, and a passage hole u32 that penetrates through an upper wall portion u31 capable of forming the recess U and through which the shielding body q2 can pass. and

Therefore, the shield q2 passes through the passage hole u32 and reaches a predetermined position near the back wall u1.

The back frame M has a lower frame member 4 as a lower base portion extending in the front-rear direction and having a portion connected to the back support D. It covers the top side of the

Therefore, the lower frame member cover Q covers the upper surface side of the lower frame member 4, thereby realizing an excellent appearance.

The lower frame member cover Q includes a front cover portion q3 extending from the front end portion of the lower frame member cover main body q1 and covering the front side of the lower frame member 4. As shown in FIG.

Therefore, by covering the front side of the lower frame member 4, the lower frame member cover Q can realize an excellent appearance.

The screw insertion holes h are provided in pairs on the left and right, and the shields q2 are provided in pairs on the left and right corresponding to the screws v inserted through the screw insertion holes h. be.

Therefore, the right and left pair of shielding members q2 can appropriately cover and conceal the left and right paired screws v.

The shielding body q2 is provided vertically from the lower frame member cover body q1 and has a rear side that can be visually recognized. It is provided with a head engagement portion q22 that can be in contact with.

For this reason, the shield q2 has a shape that suitably conceals the screw v so that it cannot be visually recognized from the outside by a user or the like, and has a suitable shape that can be formed on the head vt of the screw v. there is

A pair of left and right arms d1 pivotally supported on the support base B via a main shaft jk1, which is a shaft formed by the back support D extending in the front-rear direction, and a connecting member d2 connecting the rear portions of the pair of left and right arms d1. A nut portion nt with which a screw v can be screwed is provided on the coupling member d2.

Therefore, the back frame M can be preferably attached to the back support D using the screws v.

The present invention is not limited to the embodiments detailed above.

The backrest base is not limited to the back frame on which the mesh-like upholstery member is stretched, and may be configured to hold the backrest cushion, for example.

The cover body may be provided with a cover body and a concealing body projecting from the cover body, and the specific configuration thereof can be flexibly changed without departing from the gist of the present invention. is.

The backrest base may have a portion that can be covered by the cover main body and a portion that can be provided with the concealer, and may not have a recess that is open in a predetermined direction. .

The cover body may cover areas other than the upper surface side of the backrest base. For example, the cover body may be configured to cover the lower surface side of the backrest base.

The cover body may not have the front cover portion.

The number of screws for attaching the backrest base to the back support may be singular or two or more.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible without departing from the scope of the present invention.

B... Support base D... Back support E... Backrest M... Back frame (backrest base)
Q... Lower frame material cover (cover body)
h... Screw insertion hole q2... Concealing body u1... Back wall (positioning part)
v...Screw vt...Head

Claims (10)

A chair in which a backrest is supported by a support base via a back support,
The backrest includes a backrest base having a screw insertion hole and attached to the back support by screws,
The backrest base includes a positioning portion for positioning the head of the screw,
a cover body that is detachable from the backrest base and that is attached to the backrest base at a regular attachment position when the head of the screw is positioned in the positioning portion;
The cover body comprises a cover body and a concealing body protruding from the cover body and capable of concealing the head of the screw from the outside while engaging with the head of the screw. A chair that is. When the screw is inserted into the screw insertion hole and the head of the screw is not positioned in the positioning portion, the shield cannot hide the head of the screw from the outside. 2. The chair of claim 1, comprising: 3. The structure according to claim 1, wherein when the screw is not inserted into the screw insertion hole, a gap of a constant width can be formed between the edge of the cover body and the base of the backrest. chair. The backrest base includes a recess that is open rearward and has a back wall as the positioning portion, and a passage hole that is provided through an upper wall that can form the recess and allows the shield to pass through. 4. A chair according to claim 1, 2 or 3, which is a chair. The backrest base has a lower base portion extending in the front-rear direction and having a portion connected to the back support,
5. The chair according to claim 1, 2, 3 or 4, wherein the cover body covers the upper surface side of the lower base portion. 6. The chair according to claim 5, wherein said cover body has a front cover portion extending from a front end portion of said cover body and covering a front side of said lower base portion. The screw insertion holes are provided in pairs on the left and right,
7. The chair according to claim 1, 2, 3, 4, 5 or 6, wherein said shielding bodies are provided in pairs on the left and right sides corresponding to said screws inserted through said screw insertion holes. The shielding body is provided vertically from the cover body so that the rear side thereof can be visually recognized, and the head hook is provided on the front side of the shielding body and the front end thereof can be engaged with the head of the screw. 8. A chair according to claim 1, 2, 3, 4, 5, 6 or 7, comprising joints. 9. A chair according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein said backrest base is a back frame capable of supporting an upholstery member from which the backrest surface is formed. The back support includes a pair of left and right arms that extend in the front-rear direction and are pivotally supported on the support base via shafts, and a connecting member that connects the rear portions of the pair of left and right arms. ,
10. The chair according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein said connecting member is provided with a nut portion into which said screw can be screwed.

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