JPH04193108A - Chair - Google Patents

Abstract

PURPOSE:To reduce the production man-hours and cost and secure smooth and nimble actions by extendedly forming the front end side of a rear seat frame below a front seat frame, suspending a buffer member between an extension section and the front seat frame, and fitting the front seat frame to a stanchion. CONSTITUTION:The seat rear section Sr side of a seat member S is sunk centering on the second shaft 11 near the seat position reference point Sp located on the seat member S of a chair Ch, and the seat back member B side is tilted centering on the second shaft 11 in conjunction with it. The seat back point Bp of a seated person is formed by the side cross section shape of a seat back support frame 9 with a nearly dog-legged side face at a shallow angle or the seat back member B with the same shape or the frame 9 and the member B on the contact face of the seat back member B tilted backward in conjunction with the sinking of the seat rear section Sr. The seat back point Bp is invariably excited forward centering on the second shaft 11 by the action of a buffer member 13. The seat back point Bp invariably holds the waist section of the seated person centering on the shaft 11 regardless of the degree of the tilt of the back of the person seated on the seat member S.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is provided with a swinging mechanism for a seat plate and a backrest which is mainly applied to a rotary chair for office use.

[Prior art] Recently, Kake has been trying to improve the comfort of office rotating chairs.
A seat with a rocking mechanism for the seat and backrest that reduces fatigue even when sitting for long periods in a variety of postures, or a seat that can ergonomically follow various posture changes during that time. Numerous proposals have been made for oscillating mechanisms for backrests and backrests, and some of them have even been put into practical use.

[Problems to be Solved by the Invention] Most of the seat and backrest rocking mechanisms that have been proposed so far have a seat frame that supports the seat of a chair, and a backrest support frame that supports the backrest. They are connected via a link mechanism, so that the vertical swinging (sinking motion) of the seat and the back and forth swinging of the backrest are linked in a certain relationship.

However, the link mechanisms that have been proposed in the past to link the rocking movements of the seat and backrest are unnecessarily complicated in structure, so it is difficult to actually manufacture an office chair using these mechanisms. , the number of parts becomes extremely large, which not only increases the manufacturing cost and parts cost, but also requires a great deal of manufacturing effort.Furthermore, the complicated mechanism does not operate smoothly and easily, and therefore the seating position becomes unstable. Problems have been pointed out, such as making it look unnatural and causing fatigue.

In view of these points, the present invention aims to reduce manufacturing labor and cost by adopting a structure with a small number of parts, and also ensures smooth and light operation, and the seating posture and seating feeling are better than those of conventional proposals. The objective was to develop a chair with a rocking interlocking mechanism for the seat and backrest that was better than the original.

[Means to solve the problem]

The configuration of the present invention, which was made for the purpose of solving the above problems, divides the seat frame that supports the seat of the chair into front and rear parts based on the sitting position reference point or the vicinity thereof, and in this divided part, the front, While the rear seat frames are connected via a horizontal axis, the rear end side of the rear seat frame is integrated as a connection part raised at a substantially right angle to attach the lower end side of the backrest support frame that supports the backrest. At the same time, the front end side of the rear seat frame is the front seat frame side and extends downward, and a buffer member such as a gas spring is provided between the extension part and the front seat frame. erected,
The present invention is also characterized in that the front seat frame is attached to the pillar.

[Function] The seat frame is divided into front and rear parts near the seat reference point, and the rear seat frame swings up and down on a horizontal connecting shaft set near the dividing point, and the rear seat frame has a backrest at the rear. The connection part of the backrest support frame to which the backrest mounting frame is integrated is formed integrally with the backrest.

The center of swing of the rear half of the seat can be positioned at a fixed position near the sitting position reference point.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing an overview of an example of the mechanism of the present invention, FIG. 2 is a plan view, and FIG. 3 is a perspective view showing the relationship between the front seat frame and the rear seat frame connected to the legs. Fig. 4 is a perspective view showing the relationship between the seat member and its outer shell, Fig. 5 is a perspective view showing the relationship between the backrest member and its mounting frame, and Fig. 6 is a perspective view showing the relationship between the seat member and its outer shell. It is a side view of an example of the rotary office chair formed by comprising members.

First, in FIGS. 1 and 2, reference numeral 1 indicates a horizontal first
The main body 1a has a substantially rectangular planar shape and has a bearing hole 2 for supporting a shaft 10 (described later) and a vertical mounting hole 3 on the rear end side to be supported by the upper end side of the leg support P of the rotating chair. The front seat frame has a generally mouth-shaped cross section. The seat frame 1 has a main body 1a with an intermediate portion formed into wing-like portions 1b and lc that extend substantially horizontally from side to side when viewed from above.

The wing-shaped portions 1b and lc cover the front half side Sf of a seat member S disposed on the upper surface of the front seat frame 1 via an outer shell 21, 22, which will be described later, as shown in FIGS. 4 and 6. It provides support and serves as a terminal attachment for the armrest member E. - Furthermore, a bearing hole 4 is formed at the rear end of the main body 1a of the seat frame 1 for attaching a second shaft 11 (described later) parallel to the first shaft IO. The bearing hole 4 and the mounting hole 3 of the leg support P are provided close to each other, and the center of the mounting hole 3 is located on or near the vertical axis passing through the seat reference point Sp of the seat member S of the chair or its vicinity. It is positioned and formed so that it is located at

Reference numeral 5 denotes a rear seat frame, in which the leading end sides of the left and right side walls when viewed from the front of the main body 5a, which is formed to have approximately the same width as the front end side or the above-mentioned front seat frame 1, are each slightly extended diagonally downward in the front direction. Extension portions 5b and 5c are formed, and wing portions 5d and 5 with short eyelets on the left and right sides are formed on the upper surface side of the both side walls.
e is formed.

The rear seat frame 5 has an intermediate portion bent at approximately 90 degrees with a relatively large radius, and an upper half 6b for connecting and fixing a lower half 9a of a backrest support frame 9, which will be described later. The lower half side 6a of the connecting portion 6, which is provided with the connecting portion 6, 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 it is integrally formed or formed separately and later integrated.

On the other hand, an extension portion 5b provided at the front of the rear seat frame 5
, 5c, a bearing hole 7 that matches the bearing hole 4 in the front seat frame 1 is formed at the rear end of the extension portions 5b, 5c, and a bearing hole 7 is formed at the tip end of the extension portion 5b, 5c. A third axis 12 oriented parallel to the first axis 10
A bearing hole 8 is formed for mounting a bearing (to be described later).

Here, in FIG. 1, a backrest support frame 9 is attached to the upper end of the upper half side 6b of the connecting portion 6 that is integral with the rear seat frame 5. The frame 9 has elasticity by itself and is formed in a generally dogleg shape with a shallow angle when viewed from the side.

This mounting frame 9 is actually as shown in FIG.
It is formed so as to double as the outer shell 23 (see FIGS. 5 and 6) of the backrest member B.

The front seat frame 1 and the rear seat frame 5 can be assembled by attaching the second shaft 11 to the bearing holes 4 and 7 of the second shaft with or without bearings.
, 5 are connected to be swingable about this shaft 11. In reality, the front seat frame 1 is integrated with the leg side of the chair by having its rear mounting hole 3 fitted and supported by the leg support P, so it is the rear seat frame 1 that actually swings. Only on that side.

Before and after the seat frames 1 and 5 are assembled as described above, the bearing holes 2 of the first shaft 1O and the third shaft 12,
Horizontal shafts 102.12 are attached to 8 as the first and third shafts, and a buffer member 13 made of a coil spring or a gas spring is installed between these two shafts.

When the buffer member 13 is a coil spring, the rear seat frame 5, the connecting portion 6 and the backrest support frame 9 integrated with the frame 5 are ensured to swing about the second axis 11, and the swinging is damped by the spring.

On the other hand, when the buffer member 13 is a gas spring, it has a buffering effect similar to that of a spring due to the compressibility of the gas, and
By blocking the flow of gas within the gas cylinder, it is possible to lock the depression angle of the rear seat frame 5 and the inclination angle of the connecting portion 6 and the backrest mounting frame 9, which are integral with the frame 5, at desired positions. I can do it. It goes without saying that the above-mentioned coil spring and gas spring may be used in combination.

The rocking mechanism of the chair of the present invention configured as described above includes a seat frame 1 divided into front and rear parts near the sitting position reference point Sp.
, 5, the seat member S is attached to the front and rear of the frame 1.5, with or without being divided, but in reality, the seat member S is attached to the upper surface of the front and rear seat frames l, 5 as shown in FIG. An integrally molded outer shell 21.22 that covers both the frames 1 and 5 shown in FIG.
The seat member S, which is integral with the front and rear, is placed on top of the seat member S and held there.

Here, the front and rear outer shells 21 and 2 are integrally molded.
2, the connecting portion 20 is formed along the second axis 11, and this connecting portion 20 is provided with elasticity that allows it to bend. In addition, the outer shells 21 and 22, which are integrally formed at the front and rear, each include a front seat frame 1.
A fitting portion 21a that fits and accommodates the rear seat frame 5 and the rear seat frame 5.
, 22a are formed respectively, and screw holes 21b,
It is attached to the frames 1 and 5 on the respective sides by fixing screws 21c and 22b to the screw holes of both sheet seams 1 and 5 using screws 21cl and the like.

On the other hand, a backrest member B is attached to the upper half 6b of the connecting portion 6 integrated with the rear seat frame 5 and the backrest support frame 9.
It is formed separately from the sheet member S and attached.

That is, as shown in FIG. 5, a backrest mounting frame which also serves as the outer shell 23 of the backrest member B is inserted into the screw hole 6C of the upper half side 6b of the connecting portion 6 of the rear seat frame 5 shown in FIG. 9 is attached by a plurality of connecting screws 23a, here three, and a backrest member B is attached to the front surface of this frame 9, that is, the outer shell 23, to form an office chair as shown in FIG. It is formed into one Ch. In addition, 24 is a seat frame cover attached to the lower surface side of the front seat frame 1, 24a is an insertion hole for the support column P, and 24b.

24c is a part of a wing-shaped cover corresponding to the wing-shaped parts 1b and lc of the frame 1.

Here, the frames 1 and 5 and the connecting portion 6, the outer shells 21 to 23 attached to the lower surface or the back side of the support frame 9, and the cover 24 are, for example,
Although it is made of synthetic resin such as polypropylene, the material may be other than synthetic resin. Furthermore, the shapes and structures of the outer shell and cover are not limited to the illustrated examples.

〔Effect of the invention〕

In the chair ch of the present invention described above, the seat rear Sr side of the seat member S sinks around the second axis 11 near the sitting position reference point Sp positioned on the seat member S, and Simultaneously, the side of the backrest member B also tilts rearward about the second axis 11.

The backrest member B, which tilts backward in conjunction with the above-mentioned sinking of the seat rear part Sr, has a backrest support on its abutting surface, where the backrest point Bp of the seated person forms a dogleg shape with a shallow side surface. It is formed by the frame 9, the backrest member B having the same shape, or the side cross-sectional shape of the frame 9 and the member B, and the backrest point Bp is formed by the action of the buffer member I3 so that the second axis 11 is Since the center is always biased forward, regardless of the degree of inclination of the back of the person sitting on the seat member S, the backrest point Bp is always centered on the axis 11. It acts to hold the lower back of the body.

The above operation is smooth and light because the number of parts is small.

In addition, since the front end of the seat front portion Sf of the seat member S is not displaced at all by the sinking movement of the seat rear Sr about the axis 11 or its return movement, when the backrest member B is tilted significantly backward. However, the disadvantageous phenomenon often seen in conventional rocking mechanisms of this type, in which the back side of the knee is lifted by the upward displacement of the front end of the seat member S, does not occur at all.

Furthermore, since the seat frame, which is divided into front and rear parts and connected together, is covered with a single integrally molded outer shell, and the front and rear integral seat members are mounted on this shell, it appears that only the rear half of the seat frame sinks. It doesn't seem to be working too hard, and the view is good.

Moreover, since the connecting portion between the front half and the rear half of the integrally molded outer shell has elasticity that allows bending,
Even if only the rear side of the seat frame sinks, the outer shell can follow the movement well, so the smoothness of the operation is not impaired at all.

Therefore, even if you sit in the chair of the present invention in various postures for a long period of time, the smooth sinking motion of the rear part of the seat and the simultaneous back-and-forth rocking motion of the backrest will not bias the load on your lower back or buttocks. Furthermore, since the clothes near the waist of the person sitting on the chair are less likely to roll up, the fatigue that is likely to occur when sitting on this type of chair for a long time can be significantly alleviated.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an overview of an example of the mechanism of the present invention, FIG. 2 is a plan view, and FIG. 3 is a perspective view showing the relationship between the front seat frame and the rear seat frame connected to the legs. Fig. 4 is a perspective view showing the relationship between the seat member and its outer shell, Fig. 5 is a perspective view showing the relationship between the backrest member and its mounting frame, and Fig. 6 is a perspective view showing the relationship between the seat member and its outer shell. It is a side view of an example of the rotary office chair formed by comprising members.

Claims (1)

[Scope of Claims] 1. A seat frame that supports the seat of a chair is divided into front and rear parts based on a sitting position reference point or its vicinity, and at this divided part, the front and rear seat frames are connected through a horizontal axis. On the other hand, the rear end side of the rear seat frame is integrally formed as a connecting part raised at a substantially right angle in order to attach the lower end side of the backrest support frame that supports the backrest, and the rear end side of the rear seat frame The front end side is the front seat frame side and extends downward, and a buffer member such as a gas spring is installed between the extension part and the front seat frame, and the front seat frame is A chair characterized by being attached to a support. 2. The rear seat frame of a chair according to claim 1, wherein the rear seat frame is formed to also serve as an outer shell of a connecting portion between the frame and the backrest support frame. 3. A seat member integrally formed with an elastic joint that is flexible along the connecting axis of the seat frame on the upper surface of the front and rear seat frames which are connected to each other and are formed to be able to swing upward and downward. A chair characterized by having an outer shell fixed to the rack. 4. The backrest is an integrated backrest support that connects the lower end side of the backrest support frame, which is also formed as an outer shell of the backrest member, to a connecting part that is integrally formed on the rear end side of the rear seat frame. 4. The chair according to claim 1, wherein the chair is mounted on the front side of the frame.