JP2015085103A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair in which a support structure of a seat does not greatly disturb a space below the seat and in which a movement locus of the seat in a forward-backward direction can draw a gentler arc than a rotation locus of a seat in the forward-backward direction in the conventional chair with a seat and a leg member rotating around a pivot provided in a support member integrated with a floor, and which can stably support the seat, is excellent in a seating feeling and easy to use, moreover, has a simple structure, and can be manufactured inexpensively.SOLUTION: A chair comprises: a slide mechanism 9 to which a movable plate 8 is mounted movably in a substantially forward-backward direction with respect to a stationary plate 7 fixed on a floor; a base 31 fixed on the movable plate 8 of the slide mechanism 9; a leg post 32 erected on the base 31; and a seat 6 supported on the leg post 32.

Description

  The present invention relates to a chair provided on a floor in combination with a desk in a lecture room or the like.

  This type of conventional chair has a fixed part fixed to the floor, a lower end part of a main link pivotally supported by the front part of the seat at the upper end part, and a backrest supporting saddle with a back part fixed to the upper end part. The lower end is pivotally attached with a common axis facing left and right, and the back of the seat and the middle part of the back support rod are connected with an auxiliary link, so that the back can be rotated back and forth, Can be rotated from a horizontal state to a state in which the rear part is lifted (see, for example, Patent Document 1), or a support fixed to the floor, with the lower end of the pedestal about the axis facing the left-right direction The seat can be pivoted and the seat can be slid in the front-rear direction at the upper end of the pedestal (see, for example, Patent Document 2), or the seat can be attached to the base fixed to the floor. And support with a parallel link mechanism consisting of the rear legs, and the seating part in the front-rear direction There is one that can be translated (see, for example, Patent Document 3).

Japanese Patent No. 2927712 Japanese Patent No. 4659435 Japanese Patent No. 3751802

  However, any of the conventional chairs as described above cannot effectively use the space below the seat because the pedestal pivots greatly in the front-rear direction.

  In particular, in the chair described in Patent Document 1, there are a main link, a backrest support rod, and an auxiliary link below the seat, and they occupy most of the space below the seat, and these The structure of the seat is complicated, and the upward biasing force acts on the seated person's buttocks, and the forward biasing force acts on the backrest, causing problems such as poor seating and usability, and poor seat stability. is there.

  In the chair described in Patent Document 2, not only the pedestal is pivotally attached to the support body, but also the seat is mounted on the upper end of the pedestal so that the seat can slide in the front-rear direction. Unfortunately, the seat support structure is complicated and the manufacturing cost is high.

  In the chair described in Patent Document 3, the base and the seat fixed to the floor must be connected with a parallel link mechanism, so that not only the space below the seat is hindered by the parallel link mechanism, There is a high risk that the seated person's foot will come into contact with the parallel link, and there are problems such as a large number of parts, a complicated structure, and high manufacturing costs.

The present invention has been made in view of the above-mentioned problems of the prior art, and a first object of the present invention is to provide a seat without the seat support structure greatly obstructing the space below the seat. An object of the present invention is to provide a chair that can be stably supported, has a simple structure, and can be manufactured at low cost.
The second object of the present invention is that the movement trajectory of the seat in the front-rear direction is such that the seat and the leg member rotate around a pivot provided on a support unit integral with the floor surface. An object of the present invention is to provide a chair that can draw a gentle arc rather than a turning trajectory in the front-rear direction, and that is easy to use and easy to use.

According to the present invention, the above problem is solved as follows.
(1) A slide mechanism in which a movable member is mounted so as to be movable in the front-rear direction with respect to a fixed member fixed to the floor surface, a base fixed on the movable member of the slide mechanism, and a stand on the base It is assumed that a leg member provided and a seat supported on the leg member are provided.

  According to such a configuration, since the base, the leg member, and the seat can be integrated, not only can the seat be supported stably, but the leg member can be greatly rotated in the front-rear direction as in a conventional chair. Since it does not move, the support structure of the seat does not greatly disturb the space below the seat, and the structure is simple and can be manufactured at low cost.

(2) In the above paragraph (1), the sliding mechanism has a momentary center when the movable member moves in the front-rear direction and is located below the floor surface, and the movable member draws a gentle, upwardly convex arc in a side view. And configured to be guided in the front-rear direction.

  According to such a configuration, in the conventional chair in which the movement trajectory in the front-rear direction of the seat rotates about the pivot axis that faces the left-right direction provided on the support body integrated with the floor surface. It is possible to draw an arc that is gentler than the rotation trajectory of the front and rear direction of the seat, so that the seated person can draw back and sit with a slight force, and after sitting, The seat can be moved in the front-rear direction by moving the upper body slightly back and forth without applying a large force to the heel and buttocks, which improves the seating feeling and ease of use when moving the seat back and forth. .

(3) In the above item (1) or (2), the sliding mechanism includes a pair of front and rear guide pins facing the left-right direction provided on one of the fixed member and the movable member, the fixed member, and the movable member. And a pair of left and right side plates provided with a pair of front and rear guide grooves that guide the guide pins independently of each other when the movable member moves in the front-rear direction. The shape of the guide groove is determined so that when the movable member moves forward, the front part of the movable member tilts downward, and when the movable member moves rearward, the front part of the movable member tilts upward. .

  According to such a configuration, the base can be as close as possible to the floor surface, the space below the seat can be increased, and the structure of the slide mechanism can be simplified and manufactured at low cost. it can.

(4) In any one of the above items (1) to (3), the leg member is provided at the rear part, the front part, or both at the center in the left-right direction of the base.

  According to such a configuration, articles can be taken in and out not only in the left and right direction of the chair, but also from diagonally rearward or diagonally forward in the space below the seat. Easy to use.

(5) In any one of the above items (1) to (4), the upper surface of the base is used as an article placement surface, or a shelf plate is provided on the leg member between the seat and the base.

  According to such a configuration, the space below the seat can be effectively used as the article accommodation space.

(6) In any one of the above items (1) to (5), the fixed member is provided with a biasing unit that biases the movable member forward.

  According to such a configuration, when the chair is not used, the seat can be moved to the forefront close to the top plate of the desk, and a space where a person can pass can be formed behind the chair.

  According to the present invention, the seat support structure can stably support the seat without greatly obstructing the space below the seat, and the seat and the leg member are located on the floor surface. It is possible to draw a gentler arc than the rotation trajectory in the front-rear direction of the seat in the conventional chair that rotates about the pivot provided on the support body integrated with the body, and the seating feeling and usability are good In addition, a chair that has a simple structure and can be manufactured at low cost can be provided.

It is a side view which shows one embodiment of the chair of this invention with the desk arrange | positioned in the back and front, The state in which the seat is located in the front limit of a movable range is a solid line, and it is similarly located in an intermediate position and a rear limit. Is shown by a two-dot chain line. It is a side view when the seat in one embodiment of the chair of the present invention is located in an intermediate position. Similarly, it is a side view when the seat is located at the rear limit. It is a disassembled perspective view of the chair of this invention. It is the perspective view which looked at the chair of this invention when a seat is located in a rear limit from diagonally forward upper direction. It is the perspective view which looked at the chair when a seat is located in the back limit from diagonally forward lower part. It is the perspective view which looked at the movable plate and gas spring in a slide mechanism from diagonally forward lower side. It is the perspective view which looked at the stationary plate and gas spring in a slide mechanism from diagonally upward. It is the IX-IX line expansion vertical front view of FIG. It is the perspective view which looked at the article mounting board from diagonally upward. It is the perspective view which looked at the article mounting board from diagonally forward and lower. It is a bottom view of the base and the movable plate in the slide mechanism. FIG. 13 is a vertical sectional view taken along line XIII-XIII in FIG. 12. It is the XIV-XIV line longitudinal cross-sectional view of FIG. FIG. 5 is a cross-sectional bottom view taken along the line XV-XV in FIG. 2. It is the XVI-XVI line longitudinal cross-sectional view of FIG. It is the XVII-XVII line longitudinal cross-sectional view of FIG. It is an enlarged view of the A section of FIG. It is a disassembled perspective view of the seat except a seat frame. It is the perspective view which looked at the cover member from diagonally downward.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view showing an embodiment of the chair of the present invention together with desks arranged before and after the chair.
As shown in FIG. 1, a plurality of desks (furniture with a top plate) 4 having a horizontally long top plate 3 provided on the upper end of a fixed leg 2 on a floor 1 such as a lecture room are spaced apart in the front-rear direction. A plurality of chairs 5 (only one of which is shown in the figure) are arranged on the floor surface 1 between the desks 4 and 4 adjacent to each other in the front-rear direction, and are arranged so as to be movable in the front-rear direction. ing.

In FIG. 1, a state where the seat 6 of the chair 5 is located at the front limit is indicated by a solid line, and a state where the seat 6 is also located at the middle position and the rear limit is indicated by a two-dot chain line.
FIG. 2 is a side view of the chair with the seat 6 positioned at the intermediate position, and FIG. 3 is a side view of the chair with the seat 6 positioned at the rear limit.

Next, the specific structure of the chair 5 will be described in detail with reference to all the drawings.
The chair 5 includes a slide mechanism 9 in which a movable plate (movable member) 8 can move substantially in the front-rear direction with respect to a fixed plate (fixed member) 7 fixed to the floor surface 1, and the movable plate 8 of the slide mechanism 9. A leg 10 provided above, the seat 6 supported on the leg 10, and a backrest 11 provided integrally with the seat 6 so as to stand up from the rear end of the seat 6 are provided.

  As shown in FIGS. 4 to 9, the slide mechanism 9 has a circular arc shape in a side view in which a central portion is recessed downward in front and rear portions of a pair of left and right side plates 12 and 12 erected on both sides of the fixed plate 7. The guide grooves 13 and 14 are provided, and the front and rear guide grooves 13 and 14 are pivotally attached to the outer surfaces of a pair of left and right side plates 15 and 15 depending from both sides of the movable plate 8 with a shaft 16 facing in the left and right direction. The guide rollers 17 and 18 are fitted. The guide rollers 17 and 18 may be simple guide pins.

  As shown in FIG. 2, the front and rear guide grooves 13 and 14 provided on the side plates 12 and 12 are configured so that the seat 6 is located at an intermediate position and the guide rollers 17 and 18 are front and rear of the guide grooves 13 and 14. As shown by the solid line in FIG. 1, when the seat 6 moves toward the front limit from the position in the middle position in the direction, the front guide roller 17 is almost level with the middle position or As shown in FIG. 3, it is guided by the guide grooves 13 and 14 so that the rear guide roller 18 is located at the lower position and at the upper position as compared with the intermediate position, and the seat 6 is located at the intermediate position. When the seat 6 moves toward the rear limit, the front guide roller 17 is positioned higher than the intermediate position, and the rear guide roller 18 is approximately equal or lower than the intermediate position. It is like that.

The sliding mechanism 9 has a momentary center when the movable plate 8 is moved in the front-rear direction positioned below the floor surface 1, and the movable plate 8 draws an upwardly convex gentle arc in the front-rear direction in a side view. The shapes of the guide grooves 13 and 14 are determined so as to be guided.
The shape of the guide grooves 13 and 14 is not limited to the circular arc shape in a side view in which the central portion is recessed downward. For example, the front guide groove 13 is inclined in a downward direction from the central part, and has a mountain shape in which the rear part is substantially horizontal from the central part or an arc shape in a side view projecting upward from the central part, and the rear guide groove 14 is It is also possible to form a mountain shape in which the front part is substantially horizontal from the central part and the rear part inclines downward from the central part or an arc shape in side view in which the central part protrudes upward.

  Furthermore, the guide grooves 13 and 14 can be provided on the side plates 15 and 15 of the movable plate 8, and the guide rollers 17 and 18 can be provided on the side plates 12 and 12 of the fixed plate 7.

The guide grooves 13 and 14 are preferably provided with guide bushes 13a and 14a for smoothly guiding the guide rollers 17 and 18. In this embodiment, the guide bushes 13a and 14a are attached to the inner surfaces of both side plates 12 and 12 of the fixed plate 7, and the side plate 12 and the outer surface of the side plate 15 of the movable plate 8 inside thereof are directly slid. It is provided integrally with the sliding plate 12a for preventing this (see FIGS. 4, 8, and 9).
The sliding plate 12 a is attached to the side plate 12 by engaging and locking the upward or downward locking claws 12 b in the engaging holes 22 provided in the side plates 12.

A rear end portion of a gas spring 19 acting as a compression spring is pivotally attached to a bracket 20 fixed to a rear portion between the left and right side plates 12 and 12 of the fixed plate 7 with a shaft 20a facing in the left-right direction.
A front end portion of the gas spring 19 is pivotally attached to a bracket 21 fixed to a front portion between the left and right side plates 15 and 15 of the movable plate 8 with a shaft 21a facing in the left-right direction.
By this gas spring 19, the movable plate 8 and eventually the seat 6 are constantly urged toward the front limit, and when the chair 5 is not used, the seat 6 is moved to the front limit close to the top plate 3 of the desk 4. Thus, a space through which a person can pass can be formed behind the chair 5.

By this slide mechanism 9, the seat 6 and the backrest 11 are stopped in the forefront of the desk 4 close to the rear edge of the top plate 3 when not in use, but by pulling the backrest 11 backward, The guide rollers 17 and 18 move rearward along the front and rear guide grooves 13 and 14, and in the state where the instantaneous center is located below the floor surface 1, draw an upward convex gentle arc to the rear. It can be rotated.
The seated person can easily sit up or stand up at the end when the guide rollers 17 and 18 abut against the rear ends of the guide grooves 13 and 14.
After leaving the seat, when the hand is released from the backrest 11, the seat 6 and the backrest 11 are returned to the original limit by following the same trajectory reversely by the biasing force of the gas spring 19.
The movement of the seat 6 and the backrest 11 at this time is the same as the movement of the rocking chair, and the movement trajectory in the front-rear direction of the seat faces the left-right direction in which the seat and the leg are provided on the support body integrated with the floor surface. An arc that is gentler than the turning trajectory in the front-rear direction of the seat in a conventional chair that is turned around the pivot axis is drawn. At this time, the front and rear guide rollers 17 and 18 move in an upwardly convex gentle arc with the instantaneous center positioned below the floor surface 1 on which the seated person's foot is placed as described above. To do.
Accordingly, when sitting, the seated person can pull out the back 11 and the seat 6 in a direction away from the top board 3 with a slight force, and can also sit on the buttocks and the heel after sitting. The slide mechanism 9 can be operated and the integrated seat 6, leg 10, and backrest 11 can be moved to desired positions in the front-rear direction by moving the upper body slightly back and forth without putting it in. The seating feeling and usability when moving the seat 6 back and forth can be improved.

  Portions outside the left and right side plates 12 and 12 of the fixed plate 7 are covered with a detachable cover (not shown). However, this is not directly related to the present invention, and detailed description thereof is omitted.

  The rear portion of the movable plate 8 expands in a dovetail shape on both sides together with the side plates 15 and 15, and a horizontally-long rectangular cut hole 8 a is provided in the central portion of the rear edge.

  At the front and rear ends of the movable plate 8, the front and rear ends of a loop-shaped saddle member 33 that constitutes the base 31 of the leg 10, which will be described later, are placed from above and fixed by welding.

  As shown in FIG. 4, the above-described leg 10 includes a base 31 and a pedestal (leg member) 32 that stands up from the center in the left-right direction at the rear part. The base 31 is formed by bending a single brazing material 33 made of a metal pipe into a substantially square loop shape in plan view.

  The saddle member 33 that is bent in a loop shape terminates at the center of the rear portion of the base 31 in the left-right direction. The above-mentioned pedestal 32 made of the upward facing members 34, 34 is formed so as to be integrated with the base 31. In this example, the opposing surfaces of the left and right upward facing members 34 are in contact with each other, but may be slightly separated from each other.

  At the upper end of the pedestal 32, left and right upward saddle members 34 are bent and extended at the upper end so as to be substantially horizontal toward the front, whereby two left and right forward saddle members 35 are provided. , 35 is formed so as to be integrated with the base 31 and the pedestal 32. The opening hole at the front end of both forward facing members 35 is closed by a cap 37.

An article placement plate 38 made of synthetic resin is attached to the base 31 of the leg 10 as follows.
As shown in FIGS. 4, 5, and 10 to 14, the article placement plate 38 has a substantially rectangular plate shape in plan view, which is the same shape as the base 31, and is fitted to the loop-shaped brim member 33 from above. Thus, the lower surface of the outer peripheral portion is supported by the inner peripheral surface of the upper portion of the loop-shaped brazing member 33 of the base 31. The upper surface excluding the outer peripheral portion of the article placing plate 38 is recessed in a shallow dish shape so as to become deeper toward the rear.

A pair of left and right fittings that can be fitted to the inner peripheral surface of the front brace 33a facing in the left-right direction, with the lower portion curved in a circular arc toward the front, on the lower surface of the front end portion of the article placement plate 38 The pieces 39 and 39 are projected downward. An elastic engagement piece 40 protrudes downward from the center of the rear edge of the article placing plate 38 in the left-right direction, and a pair of left and right engaging claws 40a, 40a protrude from the lower end of the elastic engagement piece 40. Has been.
As shown in FIGS. 11 and 12, the lower surface of the left and right side portions of the article placement plate 38 is fitted from above to the opposing surfaces of the side flange members 33b and 33b in the front-rear direction of the loop-shaped flange member 33. Accordingly, positioning pieces 41 and 41 for positioning the article placement plate 38 in the left-right direction are provided so as to protrude downward.

  In order to mount the article placement plate 38 to the base 31, as shown in FIG. 13, first, the article placement plate 38 is held in the front-down shape by hand, and the front end of the article placement plate 38 is the upper surface of the front saddle member 33a. The left and right fitting pieces 39 are fitted to the inner peripheral surface of the front brim member 33a from above.

Next, as shown in FIG. 14, while the article placement plate 38 is flattened, the rear end thereof is brought into contact with the upper surface of the rear saddle member 33c, and the left and right positioning pieces 41 and 41 are placed on the side saddle members 33b and 33b. The elastic engagement piece 40 is pushed down along the inner surface of the rear saddle member 33c while being slidably contacted with the opposite surface, and the elastic engagement piece 40 is passed through the cut hole 8a provided at the rear end of the movable plate 8, The left and right engaging claws 40a are elastically engaged with the lower surface of the rear edge of the movable plate 8.
As a result, the article placement plate 38 is mounted on the upper portion of the base 31 while being prevented from being displaced in the front-rear and left-right directions and prevented from coming off upward. Since the base 31 is formed by bending a single brazing material 33 into a substantially square loop shape in plan view, the article mounting plate 38 can be easily mounted in the manner described above, and the top surface The shape of the concaved portion can prevent a small article from falling.

  In this way, the pedestal 32 is raised from the central portion of the rear portion of the base 31 in the left-right direction, and the article placement plate 38 is mounted on the upper portion of the base 31. Is fully opened, and at the rear, only the central part in the left-right direction is closed by the pedestal 32, and a wide article storage space S is secured in which both sides thereof are open. As a result, even an article having a large vertical dimension can be easily put in and out of the article placing plate 38 from many directions including obliquely rearward without being obstructed by the pedestal 32, so that the article placing plate 38 is easy to use. improves.

Further, since the entire article placing plate 38 is supported by the base 31 of the leg 10, even an article having a large mass can be placed stably, and the article placing plate 38 is also prevented from being deformed. The
Furthermore, since the article placement plate 38 having a large placement area can be mounted corresponding to the size of the base 31, the usability of the article placement plate 38 is further improved.

  Since the base 31, the pedestal 32, and the seat support rod 36 are integrally formed by bending a single flange member 33 made of a metal pipe, they are individually manufactured by separate members and coupled to each other. It is not necessary to reduce the number of parts and the number of assembling steps, thereby reducing the cost.

Next, the structure of the seat 6 and the mounting structure of the surface member on the surface (upper surface) will be described in detail with reference to FIGS. In addition, the upper part of FIG. 15 is before the seat, and the lower part is after the seat.
The seat 6 serving as a load receiving member includes a metal pipe-like seat frame 50 having a substantially backward U shape in a bottom view, a front frame 50a facing left and right in the seat frame 50, and left and right side frames 50b and 50b. The substrate 51 made of a hard synthetic resin having a substantially square shape in plan view, with the lower surfaces of the first and second sides supported, a cushion material 52 such as urethane placed on the upper surface of the substrate 51, and a cushion on the upper surface of the substrate 51 And a cover member 53 having elasticity, which is made of an elastomer or the like, attached so as to cover the material 52.

  The front end portions and the rear end portions of the left and right side frames 50b are connected to each other by fixing both end portions of the connecting plates 54, 54 facing the left and right directions to their lower surfaces by welding. The connecting plate 54 increases the torsional rigidity of the seat frame 50 (see FIG. 6).

  On the lower surface of the front and rear connecting plates 54, bolts 56, 56 inserted into the left and right ends of seat mounting members 55, 55 for mounting the seat 6 to the seat support rod 36 from below are connected to the upper surface of the connecting plate 54. These are fixed by screwing them into the welding nuts 57, 57 (see FIG. 17).

  An embossed portion 58 that bulges downward is formed on the seat mounting members 55, 55 except for both left and right end portions, and an upward concave portion 59 is formed on the lower surface of the center portion of the embossed portion 58 in the left-right direction. Each is formed. By fitting the upper half of the seat support rod 36 of the above-described leg 10 into the upward recess 59 of the front and rear seat mounting members 55 and welding and fixing them, the entire seat 6 including the board 51 is secured in the left-right direction. The central portion is supported by a seat support rod 36 (see FIG. 6). The seat 6 is substantially cantilevered by the pedestal 32.

  As shown in FIGS. 16 and 17, the substrate 51 has an arcuate cross section that is curved so that the central portion is gently recessed downward, and the left and right side portions are folded so as to form a downward U-shaped cross section. By bending, upward and downward grooves 60, 60 are formed on both the left and right sides so as to face in the front-rear direction and open downward. By fitting the left and right concave grooves 60 on the left and right side frames 50b of the seat frame 50 from above, the lower surfaces of both sides of the substrate 51 are positioned and supported in the left and right directions by the left and right side frames 50b. Has been. The front end portion of the substrate 51 is slightly bent in a front-lowering manner, and the lower surface slightly behind the portion is supported by the front frame 50 a of the seat frame 50.

  As shown in FIG. 17, the substrate 51 supported by the seat frame 50 is fixed to the upper surfaces of the front and rear connecting plates 54 by a plurality of bolts 61. In addition, upward backrest support rods 50c, 50c are connected to the rear ends of the side frames 50b, 50b in the seat frame 50, and the left and right sides of the backrest 11 are connected to the left and right backrest support rods 50c. The backrest 11 is supported by the seat frame 50 by fitting and fixing from above (see FIG. 2).

  An insertion groove 62 having a concave cross section that opens to the front surface side (upward) is formed in a portion inward of the outer peripheral edge of the substrate 51 so as to be continuous in a substantially square shape in plan view in the circumferential direction. . The left and right sides of the insertion groove 62 are positioned inwardly of the left and right side frames 50b and the recessed groove 60, and the front side is positioned slightly forward of the front frame 50a. The cushion material 52 described above is sized to be placed inwardly surrounded by the insertion groove 62.

  The cover member 53 has a substantially square shape in plan view that is slightly smaller than the size of the substrate 51. As shown in the bottom views of FIGS. 16 to 18 and FIG. An insertion piece 63 facing the direction of the substrate 51 that can be fitted from above is provided so as to be continuous in the circumferential direction. The protrusion dimension of the insertion piece 63 from the back surface of the cover member 53 is larger than the depth of the insertion groove 62, and when the insertion piece 63 is fitted into the insertion groove 62 as described later, Protrudes above the insertion groove 62. The cushion material 52 is accommodated in the inner side surrounded by the insertion piece 63.

  A closing piece 64 as a closing portion that is bent toward the surface of the substrate 51 is connected to the outer peripheral end of the cover member 53 outside the insertion piece 63. The front end (lower end) of the closing piece 64 is in contact with or close to the surface of the outer peripheral portion of the substrate 51 when the cover member 53 is attached to the substrate 51 in the manner described later.

As shown in FIGS. 16 and 18 to 20, the front and rear, left and right insertion pieces 63 of the cover member 53 are made of a hard synthetic resin having four vertical dimensions shorter than that of the insertion piece 63. The reinforcing piece 65 is attached as follows.
A plurality of attachment holes 66 are formed in the front and rear, left and right insertion pieces 63 in the circumferential direction, and a plurality of protrusions 67 projecting from the outer surface of each reinforcing piece 65 are provided in the attachment holes 66. By press-fitting from one side, each reinforcing piece 65 is attached to the inner surface of the front and rear, left and right insertion pieces 63 so as to overlap with the lower part thereof. In contrast to the above, the reinforcement piece 65 may be attached to the insertion piece 63 by press-fitting a protrusion protruding from the insertion piece 63 into the attachment hole provided in the reinforcement piece 65.

On the lower edge of each reinforcing piece 65, a plurality (three) of elastic engaging pieces 68 having inward engaging protrusions 68a are provided so as to protrude downward. The cross-sectional shape of each elastic engagement piece 68 is tapered.
An elastic engagement piece 68 that opens downward and inward is fitted to the bottom wall of the insertion groove 62 of the substrate 51 that faces each elastic engagement piece 68 except for a portion that faces the insertion piece 63. An opening 69 is formed, and the lower end of the inner opening of the opening 69, that is, the lower end of the outer peripheral portion of the substrate 51 continuous with the inner inner surface of the insertion groove 62 is the upper end of the engaging projection 68a. The engaging step 70 is engageable.

  In order to attach the cover member 53 to the surface of the substrate 51, the cushion material 52 is accommodated and held inside the insert member 63 of the cover member 53, and then, as shown in FIG. The insertion piece 63 and the reinforcing piece 65 attached thereto are fitted from above into the insertion groove 62 of 51, and each elastic engagement piece 68 at the lower edge of the reinforcement piece 65 is opened at the lower part of the insertion groove 62. The engaging projection 68 a is elastically engaged with the locking step portion 70 while being fitted into the portion 69 and penetrating. At this time, since the protruding dimension of the insertion piece 63 is larger than the depth of the insertion groove 62, the upper half of the insertion piece 63 protrudes above the insertion groove 62.

  Accordingly, the cover member 53 is fixed to the surface of the substrate 51 in a state where the cushion material 52 is accommodated between the opposing surfaces of the substrate 51 and the cover member 53, and the closing piece 64 on the outer peripheral portion of the cover member 53 is also provided. Since the tip of this is in contact with or close to the surface of the outer peripheral portion of the substrate 51, the insertion groove 62 and the insertion piece 63 are not exposed. Note that when the insertion piece 63 is fitted into the insertion groove 62 and the elastic engagement piece 68 is engaged with the locking step portion 70, the closing piece 64 may be elastically deformed upward. In order to do this, the depth of the insertion groove 62 may be increased, or the protruding dimension of the closing piece 63 may be increased.

As described above, when the closing piece 64 is elastically deformed upward, the front end of the closing piece 64 is not separated from the surface of the substrate 51 even when the cover member 53 is bent downward at the time of seating. Since it comes into contact with the surface, no gap is formed on the contact surface with the substrate 51.
Further, since an upward reaction force acts on the insertion piece 63 and the elastic engagement piece 68, the engagement protrusion 68 a is less likely to come off from the locking step portion 70.

  The front portion and the left and right side portions of the base plate 51 of the seat 6 are supported by a seat frame 50 having a rearward U shape that supports the lower surface thereof, and the lower portion of the central portion is supported by the lower surface. The side frames 50b and 50b are respectively reinforced by front and rear connecting plates 54 and 54 having both ends coupled thereto, and the lower surface of the central portion of the substrate 51 in the left-right direction is substantially supported by a seat support rod 55. Therefore, the entire seat 6 including the substrate 51 is prevented from being excessively bent downward due to the load when seated. Therefore, the article storage space S below the seat 6 is not narrowed, and the usability of the article placement plate 57 attached to the base 31 is not hindered.

  According to the mounting structure of the cover member 53 of the above-described embodiment, the insertion groove 62 formed on the outer peripheral portion of the substrate 51 and the insertion piece 63 fitted thereto are more outward than the insertion piece 63 in the cover member 53. The plug 63 is covered with the closing piece 64 provided on the outer peripheral portion and is not exposed to the outside. Therefore, there is no possibility that the plug 63 is pulled out of the plug groove 62 due to mischief or the like. Moreover, since the engagement protrusion 68a of the elastic engagement piece 68 of the reinforcing piece 65 attached to the insertion piece 63 is engaged with the locking step 70 of the lower end of the opening 69 in the substrate 51, it is removed separately. Even if the stop member is not provided, there is no possibility that the insertion piece 63 is detached from the insertion groove 62 due to the parallax.

  Moreover, since the upper half part of the insertion piece 63 protrudes above the insertion groove | channel 62, the protrusion part of the insertion piece 63 also becomes easy to elastically deform inward at the time of seating. As a result, the flexibility of the outer peripheral portion of the cover member 53 is not hindered, and the entire cover member 53 is elastically deformed, so that a flexible seating feeling is obtained.

  Furthermore, since the reinforcing piece 65 is attached to the insertion piece 63 to form a double structure, and the overlapping portion thereof is fitted into the insertion groove 62, the insertion piece 63 is fitted into the insertion groove 62. The strength is increased, the insertion piece 63 can be stably held in the insertion groove 62, and even if the insertion piece 63 is greatly elastically deformed inward, there is no possibility that it will be detached from the insertion groove 62. .

  As described above, in the above-described embodiment, the slide mechanism 9 in which the movable plate 8 is mounted to be movable in the front-rear direction with respect to the fixed plate 7 fixed to the floor 1, and the slide mechanism 9 is movable. Since the base 31 fixed on the plate 8, the pedestal 32 standing up on the base 31, and the seat 6 supported on the pedestal 32, the base 31, the leg member 32, and the seat 6 are provided. And the seat 6 can be stably supported, and the leg member does not rotate greatly in the front-rear direction as in a conventional chair. The space below 6 is not greatly obstructed, and the structure is simple and can be manufactured at low cost.

  Further, the sliding mechanism 9 has an instantaneous center when the movable plate 8 is moved in the front-rear direction, positioned below the floor surface 1, and the movable plate 8 draws an upwardly convex gentle arc in the front-rear direction in a side view. Since it is configured to be guided, the movement trajectory in the front-rear direction of the seat is configured to rotate about a pivot axis that faces the left-right direction provided on the support body integrated with the floor surface. A circular arc that is gentler than the rotational trajectory of the seat in the conventional chair can be drawn, so that the seating feeling and the convenience in moving the seat back and forth can be improved.

  Further, the slide mechanism 9 includes a pair of front and rear guide pins (guide rollers 17 and 18) provided on either one of the fixed plate 7 and the movable plate 8 and facing in the left-right direction, and the fixed plate 7 and the movable plate 8. And a pair of left and right side plates 15 provided with a pair of front and rear guide grooves 13, 14 that guide each guide pin independently of each other when the movable plate 8 moves in the front-rear direction. The shape of the guide grooves 13 and 14 is such that when the movable plate 8 moves forward, the front portion of the movable plate 8 tilts downward, and when the movable plate 8 moves rearward, Since the front portion is set to tilt upward, the base 31 can be brought as close to the floor surface 1 as possible, the space below the seat 6 can be enlarged, and the slide mechanism 9 The structure can be simplified and can be manufactured at low cost.

In addition, the following effects can be obtained by the following configurations.
(1) Since the pedestal 32 is provided in the rear part in the center of the left-right direction of the base 31, or the front part, or both, in the space under the seat 6, not only the left-right direction of the chair 5, but also diagonally backward Articles can also be taken in and out from diagonally forward, and the space below the seat 6 is convenient for use as the article storage space S.

(2) Since the upper surface of the base 31 is used as the article placement surface, or the shelf board is provided between the seat 6 and the base 31, the space below the seat 6 is defined as the article accommodation space S. Can be used effectively.

(3) Since the urging means for urging the movable plate 8 forward is provided on the fixed plate 7, the seat 6 is placed close to the top plate 3 of the desk 4 when the chair 5 is not used. By moving to the limit, a space where a person can pass can be formed behind the chair 5.

The present invention is not limited only to the above-described embodiments, and can be implemented in the following modified modes, for example, without departing from the scope of the claims.
(1) A shelf plate (not shown) is provided on the pedestal 32 between the seat 6 and the base 31.
(2) The slide mechanism 9 has another structure.
(3) The pedestal 32 is provided at the center in the left-right direction at the rear part of the base 31 or at the center in the left-right direction at the front part of the base 31.
(4) The pillars 32 are provided at both the center in the left-right direction at the rear portion of the base 31 and the center in the left-right direction at the front portion of the base 31.

DESCRIPTION OF SYMBOLS 1 Floor surface 2 Fixed leg 3 Top plate 4 Desk 5 Chair 6 Seat 7 Fixed plate 8 Movable plate 8a Cutting hole 9 Slide mechanism 10 Leg 11 Backrest 12 Side plate 12a Sliding plate 12b Locking claw 13, 14 Guide grooves 13a, 14a Guide bush 15 Side plate 16 Shaft 17, 18 Guide roller (guide pin)
19 Gas springs 20, 21 Brackets 20a, 21a Shaft 22 Engagement hole 31 Base 32 Pillar 33 Scaffold 33a Front brace 33b Side brace 33c Rear brace 34 Upward brace 35 Forward brace 36 Seat support杆 37 Cap 38 Article placement plate (article placement section)
39 Fitting piece (fitting part)
40 elastic engagement piece 40a locking claw 41 positioning piece 50 seat frame 50a front frame 50b side frame 50c backrest support rod 51 substrate 52 cushion material 53 cover member 54 connection plate (connection member)
55 Seat mounting member 56 Bolt 57 Weld nut 58 Embossed portion 59 Upward recessed portion 60 Recessed groove 61 Bolt 62 Inserted groove 63 Inserted piece 64 Closed piece (closed portion)
65 Reinforcement piece 66 Mounting hole 67 Protrusion 68 Elastic engagement piece 68a Engagement protrusion 69 Opening 70 Locking step S Article accommodation space

Claims (6)

A slide mechanism that is mounted so that the movable member can be moved substantially in the front-rear direction with respect to the fixed member fixed to the floor surface;
A base fixed on the movable member of the slide mechanism;
Leg members erected on the base;
A chair comprising: a seat supported on the leg member.   The sliding mechanism is configured so that the momentary center when the movable member moves in the front-rear direction is positioned below the floor surface, and the movable member is guided in the front-rear direction while drawing a gentle convex arc in a side view. The chair according to claim 1.   A sliding mechanism is provided on either one of the fixed member and the movable member, and a pair of front and rear guide pins facing in the left-right direction, and on the other one of the fixed member and the movable member, and the longitudinal direction of the movable member And a pair of left and right side plates provided with a pair of front and rear guide grooves that guide the guide pins independently of each other during movement, and the shape of the guide grooves is determined when the movable member moves forward. The chair according to claim 1 or 2, wherein the front portion of the movable member tilts downward and the front portion of the movable member tilts upward when the movable member moves rearward.   The chair in any one of Claims 1-3 which provided the leg member in the rear part in the center of the left-right direction of a base, or a front part, or both.   The chair according to any one of claims 1 to 4, wherein the upper surface of the base is used as an article placement surface, or a shelf is provided on the leg member between the seat and the base.   The chair according to any one of claims 1 to 5, wherein the fixed member is provided with an urging means for urging the movable member forward.

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