JPH1057179A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair which save manufacturing labor and cost by adopting a structure for reducing the number of parts, can secure a smooth and light operation and is provided with a swing linking mechanism for seat and back rest improving the attitude or feeling of sitting rather than conventional proposed articles. SOLUTION: A seat frame for holding the seat of the chair is divided back and forth and at this divided section, the rear end part of a front seat frame and the front end part of a rear seat frame are linked through a horizontal link shaft. At the same time, outer shells 21 and 22 for seat frame integrally forming a freely bending elastic bond part 20 along the link shaft are bridged and fixed on the upper surface of the linked seat frame, and a seat S is provided on the outer shells 21 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair provided with a swinging mechanism for a seat plate and a backrest, which is useful mainly as a swivel chair for office use. An outer shell for a seat frame is provided on the upper surface of the seat frame. The present invention relates to a chair to be attached.

[0002]

2. Description of the Related Art Recently, a swing mechanism of a seat or a backrest, which is designed to improve the comfort of an office swivel chair, is seated for a long time, and is less tired even in various postures,
A number of ergonomic seats and backrest swing mechanisms have been proposed that can respond ergonomically in response to various posture changes during that time.Some of them have been put to practical use. I can see it.

[0003]

However, most of the conventionally proposed seat and backrest swing mechanisms consist of a seat frame for supporting a chair seat and a backrest support frame for supporting a backrest. The link is connected via a link mechanism, and the vertical swinging of the seat (sinking operation) and the back-and-forth swinging of the backrest are linked in a fixed relationship.

However, the link mechanism for linking the swinging motion of the seat and the backrest, which has been conventionally proposed, has a complicated structure. Then, the number of parts becomes extremely large, which not only increases manufacturing costs and parts costs, but also requires a great deal of manufacturing effort,
Further, it has been pointed out that the operation is not smooth and smooth due to the complicated mechanism, and therefore, the seating posture becomes unnatural and the tired person is rather tired.

[0005] In view of the above, the present invention takes a structure with a small number of parts, thereby reducing manufacturing labor and cost, ensuring smooth and smooth operation, and improving the seating posture and seating feeling. It is an object of the present invention to develop a chair having a better interlocking mechanism of the seat and the backrest than the proposed product.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a seat frame supporting a chair seat is divided into front and rear portions. The front end of the end and the front end of the rear seat frame are connected via a horizontal connection shaft, and an elastic joint is formed on the upper surface of the connected seat frame, which is flexibly bendable along the connection shaft. Mounted and fixed the outer shell for the seat frame,
A seat is provided on the outer shell.

[0007] The seat frame divided into two in the front and rear swings up and down about a horizontal connecting axis set in the vicinity of the dividing point, and the upper surface of the front and rear seat frames is provided with the seat frame. Since the outer shell for the seat frame integrally formed with the elastic joint portion of the bending itself along the connection axis is mounted and provided, the structure of the seat portion of the chair is simplified, The number of parts is reduced and the manufacture is easy, and smooth operation is easily realized.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an outline of an example of the mechanism of the present invention,
2 is a plan view of the same, FIG. 3 is a perspective view showing the relationship between the front seat frame and the legs of the rear seat frame connected thereto, FIG. 4 is a perspective view showing the relationship between the seat member and its outer shell, and FIG. FIG. 6 is a perspective view showing the relationship between the backrest member and its mounting frame, and FIG. 6 is a side view of an example of an office swivel chair formed with the members shown in FIGS.

First, in FIGS. 1 and 2, reference numeral 1 denotes a bearing hole for supporting a horizontal first shaft 10 (described later) disposed on the front end side along the width direction of the seat surface of the chair. A front seat having a substantially rectangular shape in plan view and a substantially inverted concave cross section in a main body 1a having a vertical mounting hole 3 supported on the upper end side of a leg support P of a swivel chair on the rear end side while forming a rear end side. It is a frame. The seat frame 1 is formed with wing-like portions 1b and 1c in which an intermediate portion of a main body 1a projects substantially horizontally to the left and right as viewed from a plane. The wings 1b and 1c support a front half Sf of a seat member S disposed on an upper surface of the front seat frame 1 via outer shells 21 and 22 described later, as shown in FIGS. At the same time, it functions as an end mounting portion of the armrest member E.

At the rear end of the main body 1a of the seat frame 1, a second shaft 11 (described later) parallel to the first shaft 10 is provided.
A bearing hole 4 is formed for mounting the bearing. The bearing hole 4 and the mounting hole 3 of the leg post P are provided close to each other, and the center of the mounting hole 3 is on or near a vertical axis passing through or near the sitting reference point Sp in the seat member S of the chair. Is formed so as to be located at

Reference numeral 5 denotes a rear seat frame. In this case, the front end sides of the left and right walls as viewed from the front of the main body 5a, the front end of which is formed to have substantially the same width as the front seat frame 1, are slightly inclined forward and downward. In addition to forming extended extensions 5b, 5c, short wings 5d,
5e is formed.

An intermediate portion of the rear seat frame 5 is bent and raised by approximately 90 degrees with a relatively large radius to stand up, and an upper portion for connecting and fixing a lower half 9a of a backrest support frame 9 described later. The lower half 6a of the connecting portion 6 having the half 6b is integrated with the frame 5.

Actually, as shown in FIG. 3, the rear seat frame 5 and the connecting portion 6 are formed in advance by integral molding. It is optional whether they are formed integrally or separately and then integrated later.

On the other hand, in the extension portions 5b and 5c provided in front of the rear seat frame 5, a bearing hole 7 corresponding to the bearing hole 4 in the front seat frame 1 is formed at the rear end of the extension portions 5b and 5c. At the same time, a bearing hole 8 for mounting a third shaft 12 (described later) in a direction parallel to the first shaft 10 is formed at the tip of the extension portions 5b and 5c.

In FIG. 1, a backrest support frame 9 is attached to the upper end of the upper half 6b of the connecting portion 6 integral with the rear seat frame 5. This frame 9
Here, it has elasticity by itself and is formed in a substantially rectangular shape having a shallow angle when viewed from the side. The mounting frame 9 is actually formed so as to also serve as the outer shell 23 (see FIGS. 5 and 6) of the backrest member B, as shown in FIG.

The front end of the front seat frame 1 and the front end of the rear seat frame 5 are horizontally inserted into bearing holes 4 and 7 formed in that portion with or without a bearing. By attaching the second shaft 11 as a connecting shaft,
Both frames 1 and 5 are connected so as to be swingable about the shaft 11. Actually, since the front seat frame 1 is integrated with the leg L side of the chair with the rear mounting hole 3 fitted and supported by the leg support P, the front seat frame 1 actually swings only in the rear seat frame 5. Only on the side.

The seat frames 1 and 5 before and after assembling as described above have horizontal shafts 10 and 12 attached to bearing holes 2 and 8 formed respectively as first and third shafts. A buffer member 13 of a coil spring or a gas spring is provided between the two shafts.

When the cushioning member 13 is a coil spring, the rear seat frame 5, the connecting portion 6 integrated with the frame 5, and the backrest support frame 9 are secured to swing about the second shaft 11. , The swing of which is buffered by the spring.

On the other hand, when the cushioning member 13 is a gas spring, the cushioning action of the gas is substantially the same as that of the spring due to the compressibility of the gas. The angle and the inclination angle of the connecting portion 6 and the backrest mounting frame 9 integral with the frame 5 can be locked at desired positions. The coil spring and the gas spring described above may be used in combination.

In the chair according to the present invention configured as described above, the seat member S is divided on the upper surfaces of the seat frames 1, 5 divided into front and rear portions in the vicinity of the sitting position reference point Sp. In this case, the connecting portion 20 is provided on the upper surfaces of the front and rear seat frames 1 and 5 to cover the frames 1 and 5 shown in FIG.
The outer shells 21 and 22 which are integrally formed are mounted on the
The front and rear integrated sheet member S is placed and held on the shells 21 and 22.

In the above, the outer shells 21 and 22 having the front and rear portions integrally formed before being mounted on the upper surfaces of the front and rear seat frames 1 and 5 are connected to the second shaft 11 by the connecting portion 20.
The connecting portion 20 is provided with elasticity capable of bending. The outer shells 21 and 22 having the front and rear portions integrally formed are formed with fitting portions 21a and 22a for fitting and receiving the front seat frame 1 and the rear seat frame 5, respectively, on their lower surfaces. The screw holes 21b and 21c and the screw holes 22b are respectively inserted into the screw holes of the sheet seats 1 and 5 in the screw holes 22b.
By screwing with d or the like, it is attached to the frames 1 and 5 on each side.

On the other hand, a backrest member B is formed separately from the seat member S on the upper half 6b of the connecting portion 6 integrated with the rear seat frame 5 and on the backrest support frame 9. . That is, as shown in FIG. 5, a backrest mounting frame 9 also serving as the outer shell 23 of the backrest member B is provided in the screw hole 6c in the upper half 6b of the connecting portion 6 of the rear seat frame 5 shown in FIG. A plurality of screws, here, three connecting screws 23a, are attached, and a backrest member B is attached to the front surface of the frame 9, that is, the outer shell 23.
An office chair Ch as shown in FIG. 6 is formed.
Reference numeral 24 denotes a seat frame cover attached to the lower surface side of the front seat frame 1, 24a denotes an insertion hole of the support P, 24b,
Reference numeral 24c denotes a wing-like cover corresponding to the wings 1b and 1c of the frame 1.

Here, the connecting portion 6 between the seat frames 1 and 5 and the backrest support frame 9, the outer shells 21 to 23 attached to the lower surface and the back side of the backrest support frame 9, and The cover 24 is made of, for example, a synthetic resin made of polypropylene, but may be made of a material other than the synthetic resin. Further, the shapes and structures of the outer shell and the cover are not limited to the illustrated example.

In the chair Ch of the present invention described above, the sitting reference point positioned on the seat member S
The seat rear side Sr side of the sheet member S sinks around the second shaft 11 near Sp, and in conjunction with this, the backrest member B side also leans backward about the second shaft 11. .

The backrest member B which tilts rearward in conjunction with the depression of the rear portion Sr of the seat has a backrest point Bp of a seated person on its abutting surface in the shape of a substantially rectangular side surface with a shallow angle. The backrest support frame 9 or the backrest member B of the same shape, or the side cross-sectional shape of the frame 9 and the member B, and the backrest point Bp is set to the second The backrest point Bp is always seated around the shaft 11 regardless of the degree of inclination of the back of a person sitting on the seat member S, since the backrest point Bp is always urged forward about the shaft 11. Acts to hold the waist of the person who did it. The above operation is smooth and light because the number of parts is small.

The seat member S has a front portion Sf.
The front end of the seat is not displaced at all by the sinking operation of the seat rear portion Sr around the second axis 11 or the returning operation thereof, so even when the backrest member B is greatly inclined backward, the back side of the knee is The disadvantageous phenomenon often seen in such a conventional rocking mechanism that the front end of the member S is lifted by being displaced upward does not occur at all.

[0027]

According to the chair of the present invention which operates as described above, the front and rear seat frames which are divided into front and rear parts and connected by the connecting shaft are covered from the upper surface by one outer shell integrally formed. Since the seat member is formed so as to be mounted on it, only the rear half of the seat frame does not seem to sink in appearance, and the view is good.

In addition, since the integrally formed outer shell is formed by imparting elasticity capable of bending the connecting portions of the front half and the rear half, only the rear portion of the seat frame sinks. However, since the outer shell mounted on the upper surface of the seat frame can follow the operation well, the smooth operation is not impaired at all.

Therefore, even if the chair of the present invention takes various postures while sitting for a long time, the chair is biased toward the waist and buttocks due to the smooth squatting action of the rear part of the seat and the back and forth swinging action of the backrest that moves with it. The load is hard to be applied, and the clothes near the waist of the seated person are hard to be turned up.
In addition to the basic effect of greatly reducing or alleviating the fatigue that is likely to be caused by sitting in such a chair for a long time, the following unique effects are exhibited.

That is, in a chair having a seat frame in which the seat frame is bisected in front and rear and these are connected by a connecting shaft, a portion corresponding to the connecting shaft is provided on the upper surface of the seat frame by a flexible connecting portion. The structure is such that the outer shell for the seat frame is mounted and mounted, so the structure of the seat part of the chair is simplified, the number of parts is reduced, manufacturing is easy, and the swinging operation is smooth. Is easy to realize.

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of an example of a swing mechanism of a chair according to the present invention.

FIG. 2 is a plan view of the mechanism of FIG. 1;

FIG. 3 is a perspective view showing a relationship between a front seat frame and legs of a rear seat frame connected to the front seat frame.

FIG. 4 is a perspective view showing a relationship between a seat member and an outer shell for a seat frame in the chair of the present invention.

FIG. 5 is a perspective view showing the relationship between a backrest member and its mounting frame.

FIG. 6 is a side view of an example of an office swivel chair formed with the members shown in FIGS. 3 to 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front seat frame 2 Bearing hole of 2nd shaft 11 3 Mounting hole 4, 7 Bearing hole of 1st shaft 10 5 Rear seat frame 6 Connecting part 8 Third shaft 9 Backrest support frame 21-23 Seat frame Outer shell for seat S Seat member E Armrest B Backrest member P Leg support Sp Sitting reference point Bp Backrest point

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Atsuro Egami 1-4-18, Imafukuhigashi, Joto-ku, Osaka-shi, Osaka Inside the Itoki Works

Claims (2)

[Claims] 1. A seat frame supporting a chair seat is divided into front and rear portions, and a rear end portion of a front seat frame and a front end portion of a rear seat frame are connected via a horizontal connecting shaft at the divided portion. At the same time, on the upper surface of the connected seat frame, an outer joint for the seat frame, which is formed integrally with the flexible joint formed to be flexible along the connection axis, is mounted and fixed, and the upper shell is fixed on the outer shell. A chair provided with a seat. 2. A seat frame supporting a chair seat is divided into front and rear portions with reference to a sitting reference point or a vicinity thereof, and a rear end portion of the front seat frame and a rear seat frame of the rear seat frame are divided at the divided portion. The front of the front end is connected via a horizontal connection shaft, and the rear end of the rear seat frame is formed as a substantially right-angled connecting portion for mounting the lower end of the backrest supporting frame for supporting the backrest. While being formed integrally with the rear seat frame, the front end side of the seat frame is formed to extend downward under the front seat frame side, and the gas is supplied between the extended end portion and the front seat frame. A cushioning member such as a spring is erected, and an elastic joint is formed on the upper surfaces of the front and rear seat frames so as to be flexible along the connection axis of the seat frames. 2. The body-molded outer shell for a seat frame is mounted and fixed, and a rear end of a front seat frame is attached to a leg support on a vertical axis passing through or near the sitting reference point. Chair.