JP6860324B2 - Chair - Google Patents

Description

The present invention relates to a chair having a seat body that can slide in one direction.

As a chair used for office work, a chair whose seat body can be adjusted in the front-rear direction is known. In this type of chair, a guide mechanism that can slide in one direction is provided between the seat body and the support body that supports the seat body (see, for example, Patent Documents 1 to 3).

In the chair described in Patent Documents 1 and 2, flange portions projecting outward in the chair width direction are provided on both left and right sides of the upper portion of the support, and each flange portion is provided on the back surface side of the seat body and slides into a concave groove. It is movably engaged.

Further, in the chair described in Cited Document 3, fixed rails having a substantially T-shaped cross section are projected on the left and right sides of the upper portion of the support, and the fixed rails are provided on the left and right sides on the back surface side of the seat body. It is engaged with a movable rail.

Japanese Patent No. 3967150 Japanese Patent No. 4456453 Jitsukaisho 61-123756

However, the chair described in Patent Documents 1 and 2 has a structure in which a concave groove on the seat body side is inserted into a flange portion on the support body side from an end portion in the longitudinal direction to assemble the seat body to the support body. In addition to having to increase the wall thickness of the constituent members in order to prevent the flange portion from falling off from the flange, the flange is used when the sliding gap between the flange portion and the concave groove is narrowed to suppress rattling. There is a problem that it becomes difficult to assemble the concave groove to the portion.

The chair described in Patent Document 3 has a structure in which a dovetail groove-shaped movable rail on the seat body side is inserted from an end portion in the longitudinal direction into a fixed rail having a substantially T-shaped cross section on the support body side, and the seat body is assembled to the support body. Therefore, it is possible to prevent the movable rail from falling off from the fixed rail without making the wall thickness of the constituent member extremely thick. However, even in the case of the chair described in Patent Document 2, if the sliding gap between the fixed rail and the movable rail is narrowed to suppress rattling, it becomes difficult to assemble the movable rail to the fixed rail.

Therefore, the present invention is intended to provide a chair in which a seat body and a support body can be easily assembled while narrowing the gap between the sliding portions.

The chair according to the present invention adopts the following configuration in order to solve the above problems.
That is, the chair according to the present invention is held by the seat body on which the seated person is seated, the support body that supports the seat body, and the support body so as to be slidable in one direction, and the seat body. A sliding member to be attached and a fixing means for fixing the sliding member to the seat body are provided, and the seat body abuts on the upper surface of the sliding member to support the sliding member downward. And an upward support surface that abuts on the lower surface of the sliding member on the end side in the sliding direction to support the sliding member, and has a lower surface of the sliding member on the end side in the sliding direction. Is fixed to the upward support surface of the seat body by the fixing means in a state where the sliding member is slidably held by the support in one direction, and the fixing means slides the sliding member. It is characterized by including a female threaded portion provided on the end side in the moving direction and a bolt that penetrates the insertion hole of the seat body from the lower surface side of the seat body and is screwed into the female threaded portion. To do.

With the above configuration, when assembling the seat body to the support body, the sliding member is pre-assembled to the support body in a state where it can slide in one direction. From this state, the end of the sliding member assembled to the support is arranged on the upward support surface of the seat by slightly tilting the seat with respect to the support, and the tilted posture of the seat is based on the tilted posture of the seat. The sliding member is brought into contact with the upward support surface and the downward support surface of the seat body by returning to. After that, the end side of the sliding member in the sliding direction is fixed to the seat body by the fixing means. In the chair according to the present invention, the seat can be easily assembled to the support as described above even if the sliding gap between the sliding member and the support is narrowed.
Further, in this case, in a state where the end side of the sliding member in the sliding direction is in contact with the upward support surface on the seat body side, a bolt is inserted into the insertion hole of the seat body from the lower surface side of the seat body, and the bolt is inserted. Is tightened to the female threaded portion of the sliding member, so that the end side of the sliding member can be easily fixed to the seat body.

A support block that bulges downward from the downward support surface is arranged at a portion of the seat body on which the end side of the sliding member in the sliding direction is arranged, and the sliding member slides on the support block. An insertion groove into which the end portion in the sliding direction of the member is inserted may be provided, and the upper surface of the insertion groove may be the upward support surface.
In this case, when the sliding member pre-assembled to the support is fixed to the seat side, the end of the sliding member in the sliding direction is placed on the seat side in a posture in which the seat is slightly tilted with respect to the support. By inserting it into the insertion groove of the support block and returning the tilted posture of the seat body in that state, it is possible to bring the sliding member into contact with the upward support surface (upper surface of the insertion groove) and the downward support surface on the seat body side. Become. Therefore, by adopting this configuration, it becomes possible to easily assemble the seat body to the support body.

The female screw portion is a fixing nut fixed to the upper surface of the sliding member on the end side in the sliding direction, and the seat body is recessed upward or upward from the downward support surface. A relief groove or a relief hole that is opened to avoid interference with the fixing nut may be formed.
In this case, it is possible to prevent the fixing nut from interfering with the seat body when the end side of the sliding member in the sliding direction is brought into contact with the upward support surface of the seat body. Therefore, when this configuration is adopted, it is possible to easily assemble the sliding member to the seat body.

The support has a guide rail that projects upward to guide the sliding member slidably in one direction and regulates displacement in a direction intersecting the sliding direction of the sliding member. The lower surface of the seat may be provided with a concave portion that is recessed upward and in which the sliding member and the upper portion of the guide rail are arranged.
In this case, since the sliding member and the upper portion of the guide rail that slidably guides the sliding member are arranged in the concave portion on the lower surface of the seat body, the sliding portion of the guide rail and the sliding member is exposed from the surroundings. In addition to making it difficult for foreign matter to enter and be bitten, the sliding part becomes difficult to see from the outside and the appearance is improved.

The sliding member has a through hole penetrating in the vertical direction, and one of the seat body and the support body has a locking projection protruding through the through hole, and the seat body and the support body are supported. The other side of the body may be configured to have a regulating recess that regulates the range of movement of the seat in the sliding direction with respect to the support by abutting with the locking projection that protrudes through the through hole.
In this case, the support protrusions protruding from one of the seat and the support penetrate through the through holes of the sliding member and come into contact with the regulation recesses provided on the other of the seat and the support to support the support. The displacement of the seat with respect to the body is regulated. Therefore, by adopting this configuration, it is possible to regulate the movement range of the seat body in the sliding direction with respect to the support, even though it is a simple configuration with a small number of parts.

It is desirable that the locking projection is provided on the seat and the regulating recess is provided on the support.
In this case, since the locking projection is provided on the seat side that moves integrally with the sliding member, the through hole formed in the sliding member can be reduced to increase the contact area of the sliding member with respect to the support. The rigidity of the sliding member can be ensured.

According to the present invention, the sliding member is preliminarily assembled to the support in a state where it can slide in one direction, and the lower surface of the sliding member on the end side in the sliding direction abuts on the upward support surface on the seat side. In a state where the upper surface of the sliding member is brought into contact with the downward support surface on the seat body side, the end side of the sliding member in the sliding direction can be fixed to the seat body by the fixing means. The seat body and the support can be easily assembled while keeping the gap between the portions narrow.

It is a perspective view which looked at the chair which concerns on one Embodiment of this invention from the side. It is a perspective view which looked at the chair which concerns on one Embodiment of this invention from the rear (backrest side). It is a perspective view which looked at the chair which concerns on one Embodiment of this invention from the lower left front. It is a figure which looked at a part of the chair which concerns on one Embodiment of this invention from the bottom. It is a perspective view which looked at a part of the chair which concerns on one Embodiment of this invention from the diagonally upper right. It is sectional drawing which follows the VI-VI line of FIG. 5 of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the line VII-VII of FIG. 4 of the chair which concerns on one Embodiment of this invention. It is a perspective view which looked at a part of the seat body of the chair which concerns on one Embodiment of this invention from below. It is a figure which looked at a part of the seat body of the chair which concerns on one Embodiment of this invention from the bottom. It is a perspective view which made a part of the component member of the chair which concerns on one Embodiment of this invention a cross section. It is sectional drawing which follows the XI-XI line of FIG. 4 of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the XII-XII line of FIG. 4 of the chair which concerns on one Embodiment of this invention. It is sectional drawing which shows typically the structure of the attachment part of the operation lever which concerns on one Embodiment of this invention, and the assembly procedure.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the chair 100 according to the present embodiment as viewed from the side. FIG. 2 is a perspective view of the chair 100 as viewed from the rear (backrest side).
In the following description, for convenience of explanation, the direction in which the seated person seated in the seat body 4 in the normal posture faces forward is referred to as "forward", and the opposite direction is referred to as "rear". Further, the up-down, left-right orientations in the following description mean orientations that match the orientations centered on the seated person when the seated person sits on the seating body 4 in a normal posture. At appropriate points in the figure, an arrow FR pointing forward, an arrow UP pointing upward, and an arrow LH pointing to the left are written.

As shown in FIGS. 1 and 2, the chair 100 is provided on the leg 1 installed on the floor surface F, the box-shaped support 2 installed on the upper part of the leg 1, and the upper part of the support 2. The attached seat support member 3, the seat body 4 supported on the upper part of the seat support member 3 so as to be adjustable in the front-rear direction, and the support base 2 pivotally supported on both sides of the support base 2 (not shown). A side view substantially L-shaped backrest support 70 that can be tilted by the reclining mechanism, a backrest main body 71 attached to the front side of the upper part of the backrest support 70, and the front of the lower side of the backrest support 70. It is equipped with a pair of left and right armrests 74, which are attached to the edges and on which the elbow tips of the seated person are placed. The backrest support 70 and the backrest main body 71 constitute a backrest 7 that supports the load on the back of the seated person.

The leg portion 1 has a multi-leg 11 with casters 11A, and a pedestal 12 that stands up from the center of the multi-leg 11 and incorporates a gas spring (not shown) which is an elevating mechanism.
The outer cylinder 13 constituting the lower part of the pedestal 12 is non-rotatably fitted and supported by the multi-legged legs 11. The inner cylinder 14 constituting the upper portion of the pedestal 12 is supported by fixing the support base 2 to the upper end portion, and the lower portion is rotatably supported by the outer cylinder 13 in the horizontal direction.
The support base 2 has a built-in elevating adjustment mechanism for the pedestal 12 and a reclining mechanism for the backrest 7.

FIG. 3 is a view of the chair 100 from which some parts have been removed as viewed from the lower left front of the seat body 4.
As shown in FIG. 3, in the seat receiving member 3, the front region and the rear region on both the left and right sides are swingably connected to the upper part of the support base 2 via the front arm 60f and the rear arm 60r. The front arm 60f extends outward in the chair width direction while curving upward from the front end portion of the support base 2, and the lower end side is rotatably supported by the front portion of the support base 2 about an axis along the chair width direction. Has been done. The lower end of the rear arm 60r is integrally connected to the forward arm portion 72b of the backrest support 70, which will be described later, and extends outward in the chair width direction while being curved upward from the forward arm portion 72b. The front end of the forward arm 72b of the backrest support 70 is connected to the axis of the reclining mechanism near the rear in the support 2. Therefore, the rear arm 60r tilts around the axis along the chair width direction in response to the operation of the reclining mechanism.

The seat member 3 is rotatably connected to the upper ends of the front arm 60f and the rear arm 60r. Therefore, the seat receiving member 3 constitutes a parallel link mechanism together with the front arm 60f, the rear arm 60r, and the support group 2, and is displaced in the front-rear direction in conjunction with the tilting motion of the backrest support 70. There is.

FIG. 4 is a view of the seat body 4 and the seat receiving member 3 connected to the seat body 4 as viewed from below. FIG. 5 is a view of the left front region of the seating member 3 as viewed from the upper right front side, and FIG. 6 is a view showing a cross section along the VI-VI line of FIG. Although only the left half of the seat body 4 and the seat support member 3 is shown in FIGS. 4 and 5, the seat body 4 and the seat support member 3 are formed in a substantially symmetrical shape.
As shown in these figures, the seat receiving member 3 has a pair of left and right side frame portions 61, and a connecting frame portion 62 that connects the front regions of the left and right side frame portions 61 to each other. .. In the case of this embodiment, the left and right side frame portions 61 and the connecting frame portion 62 are formed as an integral member. The left and right side frame portions 61 are arranged so as to be parallel to each other. A guide rail 63 is projected above the left and right side frame portions 61 in order to slidably support the seat body 4 in the front-rear direction. In the present embodiment, the side frame portion 61 (seat receiving member 3) constitutes a support that supports the seat body 4.

The left and right side frame portions 61 are formed of substantially rectangular parallelepiped blocks that are elongated in the front-rear direction. On the other hand, as shown in FIG. 5, the connecting frame portion 62 connected to the side frame portion 61 is formed in a shape in which a substantially arcuate cross-sectional shape that is concave downward extends in the chair width direction. In other words, a recess 62a continuous in the chair width direction is formed on the upper surface side of the connecting frame portion 62. As shown in FIG. 6, a lightening portion 61a that opens concavely on the lower side is provided at an extension upper position of the connecting frame portion 62 of each of the left and right side frame portions 61. An inner side wall 61b adjacent to the recess 62a of the connecting frame portion 62 is provided inside the lightening portion 61a of each side frame portion 61 in the chair width direction, and downwards outside the lightening portion 61a in the chair width direction. A protruding support wall 61c is provided. Fitting holes 61b-h and 61c-h into which the pivot pin 64 is fitted are formed in the inner side wall 61b and the support wall 61c, respectively.

A connecting piece 65 to be inserted into the lightening portion 61a of the side frame portion 61 is projected from the upper end portion of the front arm 60f described above. The connecting piece 65 is formed with an insertion hole 65a into which the pivot pin 64 is rotatably inserted. A sliding bush 33 for rotatably supporting the pivot pin 64 is press-fitted into the insertion hole 65a. In the connecting piece 65, the pivot pin 64 that is fitted and fixed to the inner side wall 61b and the support wall 61c is inserted in the state where the connecting piece 65 is arranged in the lightening portion 61a of the side frame portion 61, whereby the side frame portion 61 is inserted. It is rotatably connected to. Reference numeral 66 in FIG. 6 is a shielding wall projecting from the connecting piece 65 at the upper end of the front arm 60f at an outer position in the chair width direction. The shielding wall 66 is arranged outside the support wall 61c in the chair width direction, and shields the fitting portion between the support wall 61c and the pivot pin 64 from the outside in the chair width direction. Since the shielding wall 66 does not directly support the pivot pin 64, the wall thickness in the chair width direction is thinner than that of the inner side wall 61b and the support wall 61c.

Further, the pivot pin 64 is formed in a non-circular outer surface shape having a width across flats, and the fitting holes 61b-h, 61c-of the inner side wall 61b and the support wall 61c into which the pivot pin 64 is fitted are formed. h is also formed in a non-circular shape so as to match the outer surface shape of the pivot pin 64. Reference numeral 67 in FIGS. 5 and 6 is a set screw for restricting pulling out, which is screwed into the pivot pin 64 from the direction orthogonal to the axis in a state where a part of the screw is locked to the side frame portion 61. The pivot pin 64 is restricted from rotating and coming off with respect to the side frame portion 61 by fitting in the non-circular portion with the fitting holes 61b-h and 61c-h and by cooperating with the set screw 67.

As shown in FIGS. 3 and 4, the seat body 4 includes a seat shell 40 (load support member) made of hard resin for receiving a seating load, a cushion member (not shown) arranged above the seat shell 40, and a cushion. It has a skin member 41 that covers the upper part of the member and the seat shell 40 and a peripheral area, and a pair of frame receiving portions 42 provided at positions separated from each other in the chair width direction on the lower surface of the seat shell 40. The left and right frame receiving portions 42 are provided at positions corresponding to the left and right side frame portions 61 of the seat receiving member 3, and extend along the front-rear direction of the seat body 4. The frame receiving portion 42 is formed to be wider than the guide rail 63 of the side frame portion 61 and longer in the front-rear direction than the guide rail 63. The left and right frame receiving portions 42 are configured as an integral part with the seat shell 40. However, the frame receiving portion 42 may be formed as a separate part from the seat shell 40 and fixed to the seat shell 40 by fixing means.

The main part of the backrest support 70 is made of a metal material such as an aluminum alloy, and as shown in FIGS. 1 to 3, a pair of left and right main frames 72 arranged apart from each other in the chair width direction and a chair width are provided. A connecting frame 73 that extends in the direction and connects the upper ends of the main frame 72 to each other is provided. The left and right main frames 72 are formed in a substantially L-shape in side view, and have a standing portion 72a that stands upward from the rear lower position of the seat body 4 and a forward facing portion that extends forward while being curved from the lower end of the standing portion 72a. It has an arm portion 72b and. The front end portion of the forward arm portion 72b is coupled to the shaft of the reclining mechanism provided on the support base 2 as described above. Further, the upright portions 72a of the left and right main frames 72 are inclined outward in the chair width direction so that the separation width between the two main frames 72 gradually increases toward the upper side.

The backrest main body 71 has a backrest frame 75 made of resin and a tension member 76 that is stretched on the backrest frame 75 and directly receives an input load from the back of the seated person. As shown in FIG. 2, the backrest frame 75 is an upper portion in which the distance between the left and right frame sides 75s gradually narrows downward and the upper ends of the left and right frame sides 75s extend in the chair width direction. It is formed in an inverted triangular front view shape connected by a side frame side 75u. On each of the left and right frame sides 75s of the backrest frame 75, an upper connecting arm 69u projecting from the upper region toward the rear side and a lower connecting arm 69l projecting from the lower region toward the rear side extend. It is installed. The upper connecting arm 69u is connected to the upper region of the standing portion 72a of the left and right corresponding main frames 72 of the backrest support 70, and the lower connecting arm 69l is the left and right corresponding main frames of the backrest support 70. It is connected to the lower region of the upright portion 72a of 72.

FIG. 7 is a view showing a cross section taken along the line VII-VII of FIG. 4, and FIG. 8 is a view of the left rear portion of the seat body 4 as viewed from the front lower side.
On the lower surface of each frame receiving portion 42 provided on both the left and right sides of the lower surface of the seat body 4, a concave portion 43 having a substantially rectangular cross section extending substantially along the front-rear direction of the seat body 4 is formed.

The concave portion 43 includes a bottom wall 43a that is long in the front-rear direction of the seat body 4, a side wall 43s that rises downward from each end of the bottom wall 43a in the chair width direction, and a front end of the bottom wall 43a. It has a front wall 43f that rises downward from the portion, and a rear wall 43r that rises downward from the rear end portion of the bottom wall 43a. A long guide metal fitting 44 (sliding member), which will be described in detail later, is accommodated and arranged in the concave portion 43. A part of the lower surface of the bottom wall 43a of the concave portion 43 constitutes a downward support surface 43a-1 that abuts on the upper surface of the guide metal fitting 44 and supports the guide metal fitting 44. Further, in the central region of the rear wall 43r in the concave portion 43 in the width direction, a substantially rectangular parallelepiped support block 45 that bulges forward is extended. An insertion groove 46 into which the rear end portion (end portion in the sliding direction) of the guide metal fitting 44 is inserted from the front is formed in the upper portion of the support block 45. The upper surface of the insertion groove 46 constitutes an upward support surface 46u that abuts on the lower surface on the rear side of the guide fitting 44 inserted into the insertion groove 46 and supports the guide fitting 44.

As will be described in detail later, the guide metal fitting 44 is assembled to the guide rail 63 of the left and right side frame portions 61 of the seat receiving member 3, and then its lower surface faces upward by inserting the rear end portion into the insertion groove 46. It abuts on the support surface 46u, and the upper surfaces of the central region and the front side region abut on the downward support surface 43a-1 in the concave portion 43. In this state, the guide metal fitting 44 has a trailing edge portion and a front edge portion bolted to the frame receiving portion 42. The guide metal fitting 44 is made of a robust metal plate and functions to reinforce the lower side portion of the seat shell 40 of the seat body 4 when attached to the corresponding frame receiving portion 42 of the seat body 4. ..

A bolt insertion hole (reference numeral omitted) is formed in the trailing edge of the guide metal fitting 44, and a fixing nut 47 is welded and fixed to the upper surface thereof. The fixing nut 47 constitutes the female thread portion in the present embodiment. An insertion hole 48 penetrating in the vertical direction is formed in the support block 45, and a bolt Br for fixing the guide metal fitting 44 is inserted into the insertion hole 48. The bolt Br is inserted into the insertion hole 48 from the lower side of the support block 45, and is tightened to the fixing nut 47 of the guide metal fitting 44 in that state. The trailing edge portion of the guide metal fitting 44 is thereby fixed to the support block 45 in a state of being in contact with the upward support surface 46u. Further, the front edge portion of the guide metal fitting 44 is fastened and fixed to the bottom wall 43a in the concave portion 43 by the bolt Bf in a state of being in contact with the downward support surface 43a-1. In the present embodiment, the bolt Br and the fixing nut 47 form a fixing means for fixing the lower surface of the guide metal fitting 44, which is a sliding member, on the end side in the sliding direction to the upward support surface 46U.

Further, in the rear end side region in the concave portion 43 of each frame receiving portion 42, a relief groove 49 recessed above the downward support surface 43a-1 is formed. The relief groove 49 is formed in the central region of the bottom wall 43a in the concave portion 43 in the width direction in a width slightly wider than that of the support block 45. Further, the relief groove 49 is formed over a range extending from the front side of the support block 45 by a predetermined distance to the rear wall 43r in the concave portion 43. In the relief groove 49, when the rear end portion of the guide metal fitting 44 is inserted into the insertion groove 46 with the seat body 4 tilted rearward and downward, the fixing nut 47 fixed to the upper surface side of the guide metal fitting 44 is recessed. Avoid interfering with the bottom wall 43a side of 43. Instead of the escape groove 49, an escape hole may be used to penetrate the frame receiving portion 42 in the vertical direction.

As shown in FIG. 7, a through hole 39 penetrating in the vertical direction is formed at a position closer to the rear side than the central portion in the front-rear direction of the guide metal fitting 44. The through hole 39 is formed in a long hole shape that is long in the front-rear direction. Further, a locking projection 38 that penetrates the through hole 39 and projects downward is provided on the bottom wall 43a of the concave portion 43 to which the guide metal fitting 44 is attached. On the other hand, the upper surface of the guide rail 63 that slidably holds the guide metal fitting 44 is brought into contact with the locking projection 38 protruding downward from the through hole 39 in the front-rear direction of the seat 4 with respect to the guide rail 63. A regulation recess 37 that regulates the movement range (sliding direction) is formed. The seat body 4 is restricted from sliding backward by the locking projection 38 abutting on the rear wall 37r of the regulation recess 37, and the locking projection 38 abuts on the front wall 37f of the regulation recess 37. Slide movement to the front side is restricted. The locking projection 38 may be projected from the upper surface of the guide rail 63 to form a regulation recess 37 on the bottom wall 43a side of the concave portion 43.

FIG. 9 is a view of a part of the frame receiving portion 42 on the left side of the seat body 4 as viewed from below. FIG. 10 is a view of a part of the assembled portion of the frame receiving portion 42 on the left side of the seat body 4 and the side frame portion 61 of the seat receiving member 3 as a cross section and viewed from the upper side of the left front portion. 11 is a diagram showing a cross section taken along the line XI-XI of FIG. 4, and FIG. 12 is a diagram showing a cross section taken along the line XII-XII of FIG.
As shown in FIGS. 10 to 12, the left and right side frame portions 61 of the seat receiving member 3 have guide rails 63 that hold the guide metal fittings 44 so as to be slidable back and forth. The guide rail 63 is formed in a substantially T-shaped cross section in which the width of the lower region connected to the main body portion of the side frame portion 61 is narrower than the width of the upper region. Regarding the guide rail 63, the narrow lower region is referred to as a constricted portion 63a, and the wide upper region is referred to as a head 63b.
A thin resin member 36 having good slidability is adhered to the upper surface and the left and right side surfaces of the head 63b of the guide rail 63. An opening (reference numeral omitted) having the same shape is formed in the portion of the resin member 36 corresponding to the regulation recess 37 of the guide rail 63.

On the other hand, the guide metal fitting 44 abuts on the upper wall 44u that abuts on the upper surface of the head 63b of the guide rail 63 via the resin member 36 and on the left and right side surfaces of the head 63b of the guide rail 63 via the resin member 36. It has a pair of side walls 44s and a pull-out control wall 44a that bends from the lower ends of the left and right side walls 44s in the direction of the constricted portion 63a of the guide rail 63. The left and right side walls 44s regulate the displacement of the seat 4 in the chair width direction by abutting on the side surface of the head 63b of the guide rail 63 via the resin member 36. Further, the pull-out control wall 44a regulates the upward displacement (upward pull-out) of the seat body 4 from the guide rail 63 by abutting on the lower surface of the head 63b of the guide rail 63. The guide rail 63 of the side frame portion 61 slidably guides the guide metal fitting 44, which is a sliding member, in the front-rear direction (one direction) and intersects the sliding direction of the guide metal fitting 44 (vertical direction). And the displacement in the left-right direction).

Further, in the upper wall 44u of the guide metal fitting 44, the upper surfaces of the front region and the central region abut on the downward support surface 43a-1 in the concave portion 43, and the rear end region is inserted into the insertion groove 46 of the support block 45. Then, the lower surface of the rear end region (the lower surface on the end side in the sliding direction) comes into contact with the upward support surface 46u of the support block 45. In the present embodiment, the lower surface of the rear end region of the upper wall 44u of the guide fitting 44 is in contact with the upward support surface 46u on the seat body 4 side, but other than the upper wall 44u of the guide fitting 44. The structure may be such that the lower surface on the rear end side (lower surface on the end side in the sliding direction) of the portion, for example, the pull-out control wall 44a, comes into contact with the upward support surface on the seat body 4 side.

By the way, between the frame receiving portion 42 on the left side of the seat body 4 and the side frame portion 61 on the left side of the seat receiving member 3, a slide lock for fixing the slide position of the seat body 4 in the front-rear direction with respect to the seat receiving member 3 A mechanism 20 is provided.

An operation lever 21 (rotation operation member) having a lock claw 30a is rotatably attached to the frame receiving portion 42 on the left side. On the other hand, a plurality of lock grooves 31 are formed along the front-rear direction (along the longitudinal direction of the side frame portion 61) on the left side surface of the side frame portion 61 on the lower side of the guide rail 63. ..

The lock claw 30a of the operation lever 21 is selectively engaged with any of the lock grooves 31 on the side frame portion 61 side according to the moving position of the seat body 4 in the front-rear direction. The slide lock mechanism 20 includes a lock claw 30a and a plurality of lock grooves 31 as main components.

As shown in FIG. 9, the left side portion of the left frame receiving portion 42 is provided with a recess 50 recessed inward in the width direction of the chair. A pivot 51 is projected from the front wall and the rear wall in the recess 50 so as to face each other. The pivot 51 projects so as to follow the slide direction (front-back direction) of the frame receiving portion 42.

The outer peripheral surface of the pivot 51 is not a perfect circle as shown in FIGS. 10 and 11, but has an arc shape centered on the axis (axis o) of the pivot 51 and both ends of the arc portion 51a. It is formed in a non-circular shape having a straight portion 51b that connects the portions in a straight line. The arc portion 51a has an arc shape having a central angle of 180 ° or more. Further, as shown in FIG. 9, a bracket 52 having a substantially L-shaped bottom view is projected from the wall on the bottom side of the recess 50. The bracket 52 has a columnar spring holding portion 52a, and the spring holding portion 52a is arranged so as to be coaxial with the pivot 51.

An operation lever 21, which is a rotation operation member, is rotatably held by a pair of pivots 51 of the frame receiving portion 42. Further, the spring holding portion 52a of the bracket 52 holds an urging spring 53 (coil spring) that rotates and urges the operating lever 21 toward the initial position.

FIG. 13 is a diagram showing a schematic cross section showing the structure of the mounting portion of the operating lever 21 and the assembling procedure of the operating lever 21 in the order of (A), (B), and (C).
As shown in FIGS. 10 to 13, the operation lever 21 grips a pair of pivot holding portions 22 that rotatably hold the pivot 51, a flat plate-shaped gripping operation piece 23 connected to the pivot holding portion 22, and gripping. It has an arm portion 24 extending in a direction intersecting the gripping surface of the gripping operation piece 23 from a position separated from the operation end of the operation piece 23. The lock claw 30a described above is bent and protrudes in a substantially right-angled direction from the tip of the arm portion 24. In the case of this embodiment, a pair of lock claws 30a are provided.

Hereinafter, for convenience of explanation, the operating lever 21 will be referred to as a width direction along the pivot 51 when held by the pivot 51.
The pair of pivot holding portions 22 are installed at two positions separated from each other in the width direction of the gripping operation piece 23. Each pivot holding portion 22 is formed so as to bulge in a direction intersecting the gripping surface of the gripping operation piece 23. The pivot holding portion 22 has an insertion opening 25 capable of inserting and engaging the corresponding pivot 51 from a direction substantially orthogonal to the axis o direction of the pivot 51, and the pivot 51 can be rotated inside (back side) of the insertion opening 25. It has a holding hole 26 for holding.

The insertion opening 25 is formed so that the opening width w1 is wider than the minimum diameter Dmin of the pivot 51 (diameter in a direction substantially orthogonal to the extending direction of the straight portion 51b) and narrower than the maximum diameter Dmax of the pivot 51. Has been done. Therefore, as shown in FIG. 13A, the pivot 51 can pass through the holding hole 26 when inserted into the insertion opening 25 in an angular posture having a minimum diameter of Dmin, but has a maximum diameter of Dmax. When inserted into the insertion opening 25 in an angular position, it cannot pass through the holding hole 26.
The relative rotation position range between the pivot holding portion 22 and the pivot 51 that can allow the pivot 51 to pass through the insertion opening 25 is referred to as a first relative position range P1. In the present embodiment, the relative rotation range that allows the pivot 51 to pass through the insertion opening 25 is narrow. Therefore, in FIG. 13, the first relative position range P1 is shown as a position having no width. It is shown.

As will be described in detail later, the range P2 to P3 (hereinafter, referred to as "operation angle range P2 to P3") of the relative rotation positions of the pivot holding portion 22 and the pivot 51 when the operating lever 21 is used is the first. Relative position range It is set to a relative position range away from P1. Therefore, the operating lever 21 can attach / detach the pivot holding portion 22 to / from the pivot 51 when the relative rotation positions of the pivot holding portion 22 and the pivot 51 are in the first relative position range P1, but the relative rotation of the two. When the moving position is in the operating angle range P2 to P3, the attachment / detachment of the pivot holding portion 22 from the pivot 51 is restricted.

The holding hole 26 of the pivot holding portion 22 has an arcuate surface 26a having an arcuate inner peripheral surface and a substantially triangular cross section that bulges from both ends of the arcuate surface 26a in the circumferential direction toward the center of the arcuate surface 26a. It has a regulating protrusion 26b and. The regulation protrusion 26b has a pair of contact surfaces 26b-1 and 26b-2 extending linearly from both ends of the arcuate surface 26a toward the top of the protrusion.
The central angle of the arcuate surface 26a of the holding hole 26 is set to be larger than the central angle of the arcuate portion 51a of the pivot 51. Further, the diameter of the arcuate surface 26a of the holding hole 26 is set to be substantially equal to the maximum diameter Dmax of the pivot 51 (slightly larger than the maximum diameter Dmax of the pivot 51).

When the operating lever 21 is in use, when the pivot 51 is inserted into the holding hole 26 through the insertion opening 25, the regulation protrusion 26b in the holding hole 26 comes into contact with the straight portion 51b on the outer peripheral surface of the pivot 51. The operating angle range P2 to P3 of is regulated. That is, the operating lever 21 has a rotation position P2 in which one of the contact surfaces 26b-1 of the regulation protrusion 26b abuts on the straight portion 51b of the outer peripheral surface of the pivot 51, and the contact surface 26b-2 is the outer peripheral surface of the pivot 51. It is possible to rotate between the rotation position P3 and the linear portion 51b of the above.

Further, the operating lever 21 is attached to the pivot 51 of the frame receiving portion 42 in the first relative position range P1 before the frame receiving portion 42 of the seat body 4 is assembled to the side frame portion 61 of the seat receiving member 3. It can be assembled against. At this time, one end of the urging spring 53 is locked to the operating lever 21. As a result, the urging force of the urging spring 53 acts on the operating lever 21 in the direction toward the first relative position range P1.

After that, when the frame receiving portion 42 is assembled to the side frame portion 61, the operating lever 21 is relatively rotated to a relative rotation position separated from the first relative position range P1 against the urging force of the urging spring 53. Let me do it. When the frame receiving portion 42 is assembled to the side frame portion 61 in this way, the lock claw 30a of the operating lever 21 receives the urging force of the urging spring 53 and fits into any of the lock grooves 31 on the side frame portion 61. Contact in a state. At this time, the operating lever 21 is restricted from rotationally displaced to the first relative position range P1 and is maintained in the operating angle range P2 to P3 during use.

As described above, the chair 100 according to the present embodiment has a downward support surface 43a-that abuts on the frame receiving portion 42 on the seat body 4 side and abuts on the upper surface of the guide metal fitting 44 which is a sliding member to support the guide metal fitting 44. An upward support surface 46u is provided which abuts 1 and the lower surface of the guide metal fitting 44 on the rear end side (end side in the sliding direction) to support the guide metal fitting 44, and the lower surface of the guide metal fitting 44 on the rear end side. Is fixed to the upward support surface 46u by bolts Br and fixing nuts 47, which are fixing means. Therefore, the guide metal fitting 44 is preliminarily assembled to the side frame portion 61 which is a support body so as to be slidable in the front-rear direction, and the lower surface of the guide metal fitting 44 on the rear end side is the upward support surface 46u on the frame receiving portion 42 side. The rear end side of the guide metal fitting 44 can be fixed by the bolt Br and the fixing nut 47 in a state where the upper surface of the guide metal fitting 44 is in contact with the downward support surface on the frame receiving portion 42 side. ..
Therefore, in the chair 100 according to the present embodiment, the seat body 4 is placed on the seat receiving member 3 in a state where the sliding gap between the guide metal fitting 44 and the side frame portion 61 is narrowed to suppress rattling between the two. Can be easily assembled.

Further, in the chair 100 according to the present embodiment, a support block 45 that bulges downward from the downward support surface 43a-1 is provided at a portion where the guide metal fitting 44 at the rear portion of the frame receiving portion 42 on the seat body 4 side is arranged. The support block 45 is provided with an insertion groove 46 into which the rear end portion of the guide metal fitting 44 is inserted, and the upper surface of the insertion groove 46 is an upward support surface 46u. Therefore, when the guide metal fitting 44 slidably assembled to the side frame portion 61 is fixed to the frame receiving portion 42 on the seat body 4 side, the guide metal fitting 4 is slightly tilted rearward and downward. By inserting the rear end portion of the 44 into the insertion groove 46 of the support block 45 and returning the inclined posture of the seat body 4 in that state, the guide is provided to the upward support surface 46u and the downward support surface 43a-1 on the frame receiving portion 42 side. The metal fitting 44 can be brought into contact with the metal fitting 44.
Therefore, when this configuration is adopted, the seat body 4 can be more easily assembled to the seat receiving member 3.

Further, in the present embodiment, the guide is guided by the fixing nut 47 fixed to the upper surface on the rear side of the guide metal fitting 44 and the bolt Br which penetrates the insertion hole 48 of the support block 45 and is screwed into the fixing nut 47. A fixing means for fixing the rear side of the metal fitting 44 to the seat body 4 is configured. Therefore, by adopting this configuration, the bolt Br is inserted into the insertion hole 48 from the lower surface side of the seat body 4, and the bolt Br is tightened to the fixing nut 47 of the guide metal fitting 44 to tighten the bolt Br to the rear portion of the guide metal fitting 44. The side can be easily fixed to the seat body 4.

Further, in the chair 100 according to the present embodiment, the frame receiving portion 42 on the seat body 4 side has a relief groove 49 that is recessed upward from the downward support surface 43a-1 to avoid interference with the fixing nut 47. It is formed. Therefore, it is possible to prevent the fixing nut 47 from interfering with the frame receiving portion 42 when the rear side of the guide metal fitting 44 is brought into contact with the upward supporting surface 46u on the frame receiving portion 42 side. Therefore, when this configuration is adopted, the guide metal fitting 44 can be easily assembled by the frame receiving portion 42.

Further, in the chair 100 according to the present embodiment, the side frame portion 61, which is a support, guides the guide metal fitting 44 in the front-rear direction so as to be slidable, and the direction intersects the sliding direction of the guide metal fitting 44. It has a guide rail 63 that regulates the displacement of the guide rail 63, and the lower surface of the frame receiving portion 42 on the seat body 4 side is recessed upward in a concave shape, and the guide metal fitting 44 and the upper portion of the guide rail 63 are arranged in the concave shape. A portion 43 is provided. Therefore, the guide metal fitting 44 and the upper portion of the guide rail 63 are arranged in the concave portion 43 on the lower side of the seat body 4, and are surrounded by the front wall 43f of the concave portion 43, the left and right side walls 43s, and the rear wall 43r. It will be. Therefore, when this configuration is adopted, foreign matter is less likely to be bitten into the sliding portion of the guide metal fitting 44 and the guide rail 63, and the sliding portion is less likely to be seen from the outside, so that the appearance is improved.

Further, in the chair 100 according to the present embodiment, a through hole 39 penetrating in the vertical direction is formed in the guide metal fitting 44, and a locking projection 38 penetrating the through hole 39 of the guide metal fitting 44 and projecting downward is seated. A regulation recess 37 formed in the frame receiving portion 42 on the body 4 side and restricting the movement range of the seat 4 in the front-rear direction by abutting with the locking projection 38 is provided on the guide rail 63 of the side frame portion 61. ing. Therefore, when this configuration is adopted, the movement range of the seat body 4 in the front-rear direction can be regulated even though the configuration is simple with a small number of parts.

Further, the locking projection 38 can be provided on the side frame portion 61 side which is the support, and the regulation recess 37 can be provided on the frame receiving portion 42 on the seat body 4 side, but in the present embodiment, the locking projection 38 is provided. The protrusion 38 is provided on the side of the frame receiving portion 42 that moves integrally with the guide fitting 44, and the regulation recess 37 is provided on the side of the side frame portion 61 that is displaced relative to the guide fitting 44. Therefore, when the configuration of the present embodiment is adopted, the opening area of the through hole 39 formed in the guide metal fitting 44 can be made smaller, the contact area of the guide metal fitting 44 with respect to the guide rail 63 can be increased, and the guide The rigidity of the metal fitting 44 can also be ensured.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist thereof. For example, in the above embodiment, the member constituting the upward support surface 46u (insertion groove 46) is composed of the support block 45, but the member constituting the upward support surface 46u (insertion groove 46) is plate-shaped. It may be a member of.
Further, the seat body 4 of the above embodiment has a structure in which a cushion material is arranged on the upper part of the seat shell 40 and the peripheral area of the cushion material and the seat shell 40 is covered with the skin member 41. May have a structure in which a mesh-like upholstery material is stretched on the seat frame.

4 Seat body 37 Regulatory recess 38 Locking protrusion 39 Through hole 43 Concave part 43a-1 Downward support surface 44 Guide bracket (sliding member)
45 Support block 46 Insertion groove 46u Upward support surface 47 Fixing nut (female thread, fixing means)
48 Insertion hole 49 Relief groove 61 Side frame part (support)
63 Guide rail Br bolt (fixing means)

Claims (6)

The seating body on which the seated person sits and
A support that supports the seat and
A sliding member that is held by the support in a slidable state in one direction and is attached to the seat.
A fixing means for fixing the sliding member to the seat body is provided.
The seat body abuts on the upper surface of the sliding member to support the sliding member, and the sliding member abuts on the lower surface on the end side in the sliding direction of the sliding member. Has an upward support surface to support,
The lower surface of the sliding member on the end side in the sliding direction is held by the fixing means on the upward support surface of the seat body in a state where the sliding member is slidably held by the support in one direction. Fixed ,
The fixing means is screwed into the female screw portion through the female screw portion provided on the end side of the sliding member in the sliding direction and the insertion hole of the seat body from the lower surface side of the seat body. A chair characterized by being equipped with bolts. A support block that bulges downward from the downward support surface is arranged at a portion of the seat body where the end side of the sliding member in the sliding direction is arranged.
The support block is provided with an insertion groove into which the end portion of the sliding member in the sliding direction is inserted.
The chair according to claim 1, wherein the upper surface of the insertion groove is the upward support surface. The female screw portion is a fixing nut fixed to the upper surface of the sliding member on the end side in the sliding direction.
The seat body is characterized in that a recess is formed above the downward support surface, or a relief groove or a relief hole is formed which is opened upward to avoid interference with the fixing nut. The chair according to claim 1 or 2. The support has a guide rail that projects upward to guide the sliding member slidably in one direction and regulates displacement in a direction intersecting the sliding direction of the sliding member.
The lower surface of the seat body, the depression in the concave upward, according to claim 1, characterized in that recessed portions which the upper is disposed in the guide rail and the slide member therein is provided The chair according to any one item. The sliding member has a through hole that penetrates in the vertical direction.
One of the seat and the support has a locking projection that protrudes through the through hole.
The other of the seat and the support has a restricting recess that regulates the range of movement of the seat in the sliding direction with respect to the support by abutting with the locking projection that protrudes through the through hole. The chair according to any one of claims 1 to 4, wherein the chair is provided. The chair according to claim 5, wherein the locking projection is provided on the seat body, and the regulation recess is provided on the support body.

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