JP5497075B2 - Chair - Google Patents

Description

  The present invention relates to a chair in which a backrest is pivotally attached to a leg that supports a seat so as to be tilted backward.

  This type of chair is described in Patent Documents 1 and 2, for example, and is known.

JP 2002-282077 A JP 2004-16516 A

  In each of the chairs described in Patent Documents 1 and 2, the lower end of the backrest that can be tilted backward is pivotally attached to the leg at the same height as the rear end of the seat. Therefore, the radius of rotation from the pivot part to the upper end of the backrest is naturally limited.

  As described above, when the rotation radius from the pivot portion to the upper end of the backrest is limited, the rotation angle when the backrest is tilted backward is increased. It is necessary to increase the height of the seat.

  Moreover, like the chair described in Patent Document 1, if the lower end of the backrest is simply pivotally attached to the leg at the rear end of the seat, the seat back when the backrest is tilted backwards When the chair is installed, a large installation space in the front-rear direction is required.

In the chair described in Patent Document 2, the structure is complicated and the number of parts is large because the chair is lifted by a link mechanism and then tilted backward so that the backrest can be tilted largely backward. Has the problem.
Also, since is provided a armrest stand on both sides of the seat, there is a problem that the separation dimension of the armrest stand together can not be large.

  The present invention has been made in view of the above problems, and the backrest can be greatly tilted backward at a small rotation angle without increasing the height of the leg body and the seat body, and at the time of backward tilting. An object of the present invention is to provide a chair capable of reducing the rearward projecting dimension.

According to the present invention, the above problem is solved as follows.
(1) In a chair formed by pivotally mounting a backrest supporting frame with a backrest attached to the front surface to a leg that supports the seat so that it can be tilted backward from a position standing up behind the seat. A pair of left and right mountains in a side view having a leg that has a front leg that slopes forward and downward, and a rear leg that slopes rearward and downward and expands outward so as to form a rearward C-shape in plan view. Side legs, the front ends of a pair of left and right forward arms that are connected to the lower end of the back support frame, and the front arms are located between the left and right rear legs. In order to be able to incline, it is pivotally attached to an appropriate position of the leg below the seat between the left and right side legs, and a lower end portion of an armrest is placed on the left and right forward arms, and an upper portion thereof is connected to the front leg. Attach so that it is located outside the vicinity of the connection with the rear leg.

With such a configuration, the front ends of the pair of left and right forward arms facing the front in the back support frame are arranged on the left and right sides so that both forward arms can tilt backward between the left and right rear legs. By pivoting between the legs at the appropriate position of the lower leg of the seat, the radius of rotation from the pivoting part of the forward arm to the upper end of the backrest is increased, and the backrest is increased with a small rotation angle. It can be tilted backward, and the rearward projecting dimension when tilting backward is also reduced.
In addition, since the leg and the seat can be tilted rearward without increasing the height of the leg or the seat, it is possible to provide a low seat height type chair that can be seated in an easy posture.
Further, since the left and right rear legs are widened outward so as to form a backward C-shape in plan view, the stability of the chair when the backrest is tilted backward is improved.

(2) In the above item (1), the lower end portion of the armrest is attached to the armrest attaching portion protruding from the upper surface of the forward arm portion.

  With such a configuration, the position of the lower end of the armrest inevitably increases, so that when the forward arm is tilted backward, the lower end of the armrest does not easily interfere with the rear leg.

(3) In the above paragraph (1) or (2), the front ends of the pair of left and right forward arms are pivotally attached to the appropriate position of the leg at a position that is substantially level with the top of the side leg that forms the chevron. To do.

  With such a configuration, the rotational radius of the backrest becomes larger and the pivoting position becomes higher, so that the backrest can be largely inclined backward with a smaller rotation angle.

(4) In any one of the above items (1) to (3), the vicinity of the tops of the left and right side legs are connected by a connecting member facing in the left-right direction, and a seat is supported on the upper surface of the central portion of the connecting member. A support base is provided.

  With such a configuration, the load of the seat is substantially supported near the top of the left and right side legs, that is, in the central part between the both side legs, in the vicinity of the connecting part of the front and rear legs. , Stability of the chair when sitting is improved.

(5) In any one of the above items (1) to (4), the front legs of the left and right side legs are also expanded outward so as to form a square shape in plan view.

  With such a configuration, the stability of the entire chair is improved, and the possibility that the lower leg portion of the seated person will hit the front leg is reduced.

(6) In any one of the above items (1) to (5), the side leg is shaped like a side view in which the longitudinal dimension of the rear leg is longer than that of the front leg.

With such a configuration, the stability when the backrest is tilted backward is further increased.
In addition, since the side legs are shaped like a side view, it is possible to provide a low-sitting-type chair in which the height of the legs and seats is lower.

According to the present invention, the radius of rotation from the pivoting portion of the forward arm portion to the upper end of the backrest is large, the backrest can be greatly tilted backward at a small rotation angle, and the rearward when tilting backward The projecting dimension to becomes smaller.
In addition, since the leg and the seat can be tilted rearward without increasing the height of the leg or the seat, it is possible to provide a low seat height type chair that can be seated in an easy posture.

It is a front perspective view showing one embodiment of a chair of the present invention. It is also a front view. It is a side view similarly. Similarly, it is a side view when the backrest is tilted backward. Similarly it is a rear view. It is a perspective view of a leg. It is also a plan view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front perspective view of the chair of the present invention, FIG. 2 is a front view, FIG. 3 is a side view, FIG. 4 is a side view when the backrest is also tilted backward, and FIG. 5 is a rear view. The chair includes a leg 1, a seat 2 supported by the leg 1, a back support frame 3 pivotally attached to the leg 1, and a mesh-like backrest attached to the front surface thereof. A backrest 6 composed of a plate 4 and a cushion body 5 and a pair of left and right armrests 7 having a substantially rhombus shape in side view attached to the lower end of the backrest support frame 3 are provided.

  As shown in the perspective view of FIG. 6 and the plan view of FIG. 7, the leg body 2 includes a front leg 9 a having a caster 8 at the front end and a front-falling slope, and a rear end that is longer than the front end. A pair of left and right side legs 9, 9 having a caster 8 and a rear leg 9 b that has a rearwardly descending slope, and a pair of left and right side legs 9. It consists of a connecting member 10 having a U-shape.

  The reason why the rear leg 9b is longer than the front leg 9a is to ensure the stability of the chair when the backrest 6 is tilted backward.

  The front legs 9a and the rear legs 9b of the left and right side legs 9 are outwardly centered on their tops so as to expand outwardly into a front-shaped C-shape and a rear-shaped C-shape in a plan view, respectively. It is bent and the stability of the leg 1 is enhanced.

  A short shaft portion 11 facing in the left-right direction is integrally connected to the top portion of each side leg 9, and a mounting piece 12 protrudes downward on the inner surface of the front end portion of the rear leg 9 b ( (See FIG. 3).

  On the inner end surface of the left and right short shaft portions 11, the upper ends of a pair of left and right standing uprights 10 a, 10 a in the connecting member 10 are on the inner end surface, and on the inner side surface of the mounting piece 12, on the connecting member 10. Both side surfaces of the horizontal flange 10b located slightly on the rear leg 9b side from the standing piece 10a are screwed with bolts 13 inserted from the outside.

  The head of the bolt 13 inserted into the short shaft portion 11 is covered with a circular cap 14 (not shown in FIG. 5) fastened to a concave hole on the side surface of the short shaft portion 11.

  On the upper surface of the upward bulging portion 10c formed at the center portion in the left-right direction of the horizontal flange 10b in the connecting member 10, the rear end of the support base 15 for supporting the seat body 2 and the front end portion of the support base 15 are lateral. The bolts 16 are fixed so as to protrude forward of the flange 10b.

  The height of the upper end of the support base 15 is such that the connecting member 10 has an upward U-shape, the upper end of the upright piece 10a is fixed to the top of the side leg 9, and the horizontal rod 10b is fixed to the mounting piece 12 of the rear leg 9b. As a result, the upper end of the side leg 9 protrudes slightly upward.

  As shown in FIGS. 3 and 5, the backrest support frame 3 stands on the rear side of the seat body 2 and has a pair of left and right arms provided with a forward arm portion 17 a inclined obliquely rearward and upward at the lower end. Side frames 17 and 17 and a rearward convex arc-shaped upper frame 18 that joins the upper ends of both side frames 17, and the overall shape is substantially vertically long and downward U-shaped. ing.

  As shown in FIGS. 4 and 5, the left and right dimensions of the front arm portions 17 a and 17 a connected to the lower ends of the left and right side frames 17 are determined between the rear legs 9 b and 9 b of the pair of left and right side legs 9. When the backrest support frame 3 is tilted backward, the forward arm portion 17a can be tilted without interfering with the left and right rear legs 9b.

  As shown in FIG. 6, an inward bent portion 17b that is substantially coaxial with the short shaft portion 11 at the top of the side leg 9 is connected to the front ends of the left and right forward arm portions 17a, and the inward bent portion 17b. Is urged by a torsion shaft (both not shown) in a reclining mechanism such as a known rubber torsion unit provided in the support base 15 so as to be rotatable and always counterclockwise in a side view. Are connected together. As a result, the backrest support frame 3 and the backrest 6 attached thereto tilt backward with the support base 15 as the center when the seated person pushes the backrest 6 backward (see FIG. 4).

  As shown in FIG. 3 and FIG. 6, as shown in FIGS. 3 and 6, the left and right side ends projecting outward from the support base 15 are connected to the front end of the support base 15. The inner side surface of the inwardly bent portion at the lower ends of the pair of left and right seat support links 20, 20 is pivotally attached to the front and rear by a pivot 21 that faces in the left-right direction.

  Further, seat support pieces 22, 22 project upward from the upper surfaces of the front end portions of the left and right forward arm portions 17 a in the back support frame 3. Reference numeral 23 denotes a rectangular parallelepiped armrest mounting portion which is provided on the upper surface of the forward arm portion 17a so as to be continuous with the seat support piece 22, and the lower end portion of the armrest 7 is attached to the armrest mounting portion 23. Yes.

  The left and right sides of the front end of the seat frame 24 attached to the lower surface of the seat body 2 are pivotally attached to the upper ends of the left and right seat support links 20 so as to be rotatable by pivots 25 that face in the left-right direction. On the upper ends of the left and right seat support pieces 22, left and right side portions on the rear side of the seat frame 24 are pivotally attached by pivots 26 facing the left and right directions (see FIG. 3).

  As a result, the front portion of the seat body 2 is supported by the left and right side portions of the front end of the support base 15 that is substantially integrated with the leg body 1 via the pair of left and right seat support links 20. 2 is supported by the left and right forward arms 17a of the back support frame 3 via a pair of left and right seat support pieces 22.

  Therefore, as shown in FIG. 4, when the backrest support frame 3 is tilted backward together with the backrest 6, the seat body 2 is also tilted rearward and downward in conjunction therewith. After the seat body 2 is attached, the rear part of the front leg 9a and the front part of the rear leg 9b of the both side legs 9 are located inward of the both side edges of the seat body 2, and the both side legs 9 of the leg body 1 are It does not protrude greatly outward (see FIG. 2).

  As described above, in the chair of the above-described embodiment, the front and lower ends of the backrest support frame 3 are located at the center upper part between the both side legs 9, 9 of the leg 1, that is, below the front side of the seat body 2. Since the pivot base 15 is pivotally attached to the support base 15 that is substantially integrated with the body 1, the radius of rotation from the pivot portion to the upper ends of the backrest support frame 3 and the backrest 6 becomes large, and the rotation is small. The backrest 6 can be greatly tilted rearward at an angle, and the rearward projecting dimension during rearward tilting is also reduced.

Further, since the legs 1 and the seat 2 can be tilted rearward without increasing the height thereof, a low seat height type chair that can be seated in an easy posture can be provided.
In addition, in the above-described embodiment, the top portions of the side legs 9 are provided such that the back support frame 3 and the front portion of the seat body 2 are provided on the horizontal rod 10a of the connecting member 10 having a U-shape in the front view in the leg body 1. Therefore, the seat height is lower and the user can sit in a more comfortable posture.

  The front and rear arm portion 17a of the backrest support frame 3 has a relatively long front and rear dimension and a large radius of rotation, and is inclined obliquely rearward and upward below the seat body 2, and its front lower end is Since the pivotable angle of the forward arm portion 17a can be increased, the rear end may interfere with the floor surface. There is no.

The front leg 9a and the rear leg 9b in the both side legs 9 of the leg 1 are expanded outward so as to form a square shape in plan view, and the front and rear dimensions of the rear leg 9b are longer than the front leg 9a. And the stability when the backrest 6 is tilted backward is also excellent.
Further, since the left and right front legs 9a are expanded outward, there is little possibility that the lower limbs of the seated person will hit the front legs 9a.

  In the above embodiment, the forward arm portion 17a of the backrest support frame 3 is pivotally attached to the support base 15, but on the tops of the left and right side legs 9, that is, on the inner surface of the short shaft portion 11. In some cases, it is pivotally attached via an appropriate reclining mechanism.

  Further, in the above embodiment, the seat body 2 is also tilted backward in conjunction with the tilting of the backrest support frame 3, but the seat body 2 is simply fixed at an appropriate upper position of the leg body 1 including the support base 15. It may be provided.

DESCRIPTION OF SYMBOLS 1 Leg body 2 Seat body 3 Backrest support frame 4 Backrest board 5 Cushion body 6 Backrest 7 Armrest 8 Caster 9 Side leg 9a Front leg 9b Rear leg 10 Connecting member 10a Standing piece 10b Side ridge 10c Upward bulging part 11 Short Shaft portion 12 mounting piece 13 bolt 14 cap 15 support base 16 bolt 17 side frame 17a forward arm portion 17b inwardly bent portion 18 upper frame 19 shaft-like support portion 20 seat support link 21 pivot 22 seat support piece 23 armrest attachment portion 24 seat frame 25 pivot 26 pivot

Claims (6)

In a chair formed by pivoting a backrest supporting frame with a backrest attached to the front surface to a leg that supports the seat so as to be able to tilt backward from a position standing up behind the seat.
The left and right 1 in a side view mountain shape having a front leg that tilts forward and downward and a rear leg that slopes rearward and downward and expands outward so as to form a backward C-shape in plan view. A pair of side legs are provided, and the front end portions of a pair of left and right front arms facing the front and connected to the lower end of the backrest support frame are disposed between the front arms and the left and right rear legs. In order to be able to tilt backward, it is pivotally attached to the right leg below the seat between the left and right side legs, and the left and right forward arms are provided with lower ends of armrests, the upper part of which is the front legs. A chair that is mounted so as to be located on the outer side than the vicinity of the connection portion between the rear leg and the rear leg.   The chair according to claim 1, wherein the lower end portion of the armrest is attached to an armrest attachment portion protruding from the upper surface of the forward arm portion.   The chair according to claim 1 or 2, wherein the front end portions of the left and right forward arm portions are pivotally attached to appropriate positions of the leg bodies at a position substantially equal to a top portion of the side leg that forms a mountain shape.   The vicinity of the tops of the left and right side legs are connected to each other by a connecting member facing in the left-right direction, and a support base that supports the seat body is provided on the upper surface of the central portion of the connecting member. Chair.   The chair according to any one of claims 1 to 4, wherein the front legs of the left and right side legs are expanded outward so as to form a C-shape in a plan view.   The chair according to any one of claims 1 to 5, wherein the side legs are formed in a shape of a side view in which the front and rear dimensions of the rear legs are longer than the front legs.

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