JPH0514570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interlocking shock absorbing mechanism between the seat plate and backrest of a chair such as an office chair.

[Conventional technology]

As an interlocking shock absorbing mechanism for the seat plate and backrest of office chairs, etc., gas springs, coil springs, torsion bars, etc. have been used as shock absorbing bodies, and the slow movement of the seat plate and backrest is interlocked with this via a link mechanism. A slow-moving mechanism has been proposed.

[Problem that the invention seeks to solve]

Regarding shock absorbing mechanisms in which the seat plate and backrest are interlocked, the ones proposed so far have complicated interlocking mechanisms, or are capable of changing the degree of shock absorption, such as the hardness of the spring or the repulsive force. The proposed system has a complicated mechanism and a large number of parts.
Another problem is that since it is large-scale, there are many failure elements.

[Means to solve the problem]

In view of the problem of the shock absorbing mechanism in which the seat plate and the backrest are interlocked, the present invention provides an interlocking shock absorbing mechanism between the seat plate and the backrest that uses a shock absorber such as a coil spring, and the mounting structure of the shock absorber is simple. In addition, the purpose was to provide an interlocking shock absorbing mechanism for the seat plate and backrest that allows the shock absorber to be easily changed. An operating link whose lower end is pivotally connected to the leg frame in a chair in which the chair is pivotally connected and the up and down swinging movement of the seat plate about the pivot point is damped via a buffer such as a spring. A backrest support whose upper end is supported and guided by a guide formed horizontally on the lower surface of the seat plate, and whose lower end near the upper end of this operating link is pivotally movable back and forth behind the seat plate. It is characterized in that the lower ends of the members are connected via a connecting link.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side cross-sectional view of an example of the mechanism of the present invention, FIG. 2 is an end view taken along line A-A, and FIG. 3 is an end view taken along line B-B.

In these figures, 1 is a leg frame formed by tilting the upper end of a vertically rising pipe-shaped support P horizontally at an angle of about 85 degrees, and the cross-sectional shape of this frame 1 is It has a box shape as shown in FIGS. 2 and 3, and its tip is formed into a block shape that stands up in a vertical direction, and is a pivot shaft attachment part that is pivotally connected to the seat frame 7, which will be described later. 6.

Reference numeral 2 denotes a coil spring housed inside the frame 1, and two coil springs are used here.
Reference numerals 3 and 4 apply to the front and rear ends of this spring 2, and the spring receiver has an oblong plate-like front shape. Reference numeral 5 has a rear end fixed to the spring receiver 4 5a and a tip end thereof passed through the spring receiver 3. With the tension reload facing the pivot shaft mounting part 6 of the seat frame 7,
Two rods 5 are also used.

In addition, in the leg frame 1, between the spring receiver 3 and the lid 1a formed at the tip of the frame 1, the front surface of the spring receiver 3 and the rear surface of the lid 1a are formed with a tapered interval 1b. A wedge member 1c is held in the gap 1b, and a threaded rod 1 is attached to this wedge member 1c.
d is screwed.

When the threaded rod 1d is rotated, the wedge member 1c moves up and down between the gaps 1b and the spacing between the two spring receivers 3 and 4 can be changed, in other words, the degree of compression of the spring 2 can be changed. It is configured. Note that 1e is a knob for rotating the screw rod 1d.

On the other hand, reference numeral 7 denotes a seat frame in a substantially horizontal position with a seat plate S attached to its upper surface, and a lever block 8 protruding downward from the front lower surface corresponding to the seat frame pivot shaft mounting portion 6 of the leg frame 1. In addition, a cavity G is formed between the lower surface of the seat plate S and the upper surface of the frame 7 for accommodating an interlocking mechanism to be described later.

The block 8 has an upper portion that is parallel to the front and back of the seat plate S and has a horizontal shaft 9 that connects the pivot shaft mounting portion 6.
At the same time, the tip of the tension rod 5 is attached to the lower end of the block 8 at an axis 10 parallel to the axis 9.
It is pivoted by.

As a result, the lower surface of the seat frame 7 and the leg frame 1
A space is formed between the upper surfaces of the seat plate S, and this space becomes a stroke space in the rocking motion of the seat plate S.

Reference numeral 11 denotes an operating link installed between the leg frame 1 and the seat frame 7 so as to be tilted forward, and the lower end of this link 11 is pivoted to the leg frame 1 at an axis 11a that is horizontal to the axis 9 At the same time, the upper end 11b is supported and guided by a guide 11c formed by a long hole formed in the seat frame 7 in the horizontal direction.

Thus, when the seat plate S swings clockwise about the shaft 9, the upper end 11b of the link 11 is moved forward (to the left in the figure) along the guide 11c.

Reference numeral 12 denotes a support frame member for the backrest BR, whose lower end is pivoted 12a to the rear end of the seat frame 7, so that this backrest can be attached to the seat plate S.
It supports the BR in a swingable manner.

Therefore, by connecting the lower end 12b of the frame member 12 to the upper end of the operating link 11, the swing of the seat plate S is caused by the movement of the link 11 and the frame member 1.
2 to the backrest BR, and the backrest BR swings in conjunction with the seat plate S. Moreover, on the contrary, even if the backrest BR is tilted, the seat plate S can be swung. Backrest BR here
The interlocking degree of inclination is between the pivot portion 12a and its lower end 12b.
You can adjust the distance to your liking by adjusting the size of the distance.

In this embodiment, two connecting links 1 are provided between the operating link 11 and the backrest support frame 12.
3 and 14 are interposed. Among these, the connecting link 14 is connected to the operating link 1 in the narrow space G.
1 to the backrest support frame 12, the connecting link 14 is not necessary if the space G is sufficient.

Further, the number of springs 2 serving as a buffer body may be two or more, or one. In this case, leg frame 1
Needless to say, the cross-sectional shape of will depend on the number and shape of shock absorbers such as springs to be accommodated.
Note that the buffer may be something other than a spring, such as a gas spring.

Furthermore, a mechanism for adjusting the degree of compression of the spring 2 can also be provided on the rear end side of the spring 2, that is, on the side of the spring receiver 4.

[Action of the invention]

When a load is applied to the seat plate S of the chair having the above-mentioned shock absorbing mechanism, such as when a person hangs it, the seat frame 7 tends to rotate about the shaft 9 in the clockwise direction in the figure. This movement rotates the screw block 8 in the seat frame 7 clockwise about the shaft 9 while pulling the shaft 10 forward (to the left in the figure).

The forward rotation of the block 8 causes the tension rod 5 plugged to the shaft 10 to be pulled forward (to the left in the figure), so the coil spring 2 is moved through the spring receiver 4 to the spring receiver 3.
It will be compressed towards the side of .

On the other hand, the clockwise rotation of the seat frame 7 causes the tip 11b of the operating link 11 to
Since the backrest support frame 12 is connected to this link 11 via the connecting links 13 and 14, its pivot shaft 12a
The lower end 12b is pulled forward (to the left in the figure) about the shaft 12a, and the backrest BR is therefore tilted clockwise, ie, backward, about the shaft 12a.

Therefore, the load applied to the seat plate S is buffered by the repulsive force of the compressed spring 2.
This will cause the backrest BR to tilt clockwise (sink) and at the same time tilt the backrest BR backwards.
This mechanism, together with the cushion mechanism of the seat plate S, functions as an interlocking tilting mechanism of the backrest.

4 and 5 are side sectional views showing another embodiment of the present invention.

The mechanism of the embodiment shown in FIGS.
The mounting manner of the coil spring 2, the compression mechanism, and the structure of the front side of the seat frame 7 are different between the illustrated mechanism and the seat plate buffer mechanism.

That is, in this embodiment, the coil spring 2 is directly installed between the legs frames 1 and 7 in the swing stroke space of the seat frame 7 formed by the leg frames 1 and the seat frame 7. Therefore, the downward rocking (sinking) movement of the seat frame 7 directly compresses the coil spring 2 and is damped thereby. Therefore, the front end of the seat frame 7 is pivotally connected to the front end of the leg frame 1 by the shaft 9, and the lever block 8 in the previous embodiment is not formed.

Further, the seat frame 7 is separated 7c into a front side 7a and a rear side 7b with the pivot shaft 9 as a boundary, and the front side 7a is fixed to the upper surface of a bracket-shaped portion 1f formed in front of the shaft 9 in the leg frame 1. ing.

In this way, when the seat frame 7 swings, the front side 7a does not rotate (see FIG. 5), but the rear side 7b swings.

Therefore, there is an advantage that the front end of the seat plate S is not displaced due to sinking of the seat plate S, making it easier to sit on.

Of course, the above configuration can also be applied to the chair having the structure shown in the first figure.

Note that the same reference numerals as in FIG. 1 indicate the same members.

As shown in the above embodiments, the present invention can be suitably used in so-called rotating chairs for office use because the springs and connecting links can be housed in the frame.

Note that the mechanism of the present invention may be used for chairs other than rotating chairs, such as four-legged chairs and other chairs with simple leg frames or seat frames. something similar,
An interlocking shock absorbing mechanism can be provided with a relatively simple structure by forming it on the upper part of the leg of the chair.

In addition, the spring housed in the leg frame is
The degree of compression may be easily adjusted so that the degree of cushioning can be freely adjusted according to the user's preference.

[Effects of the Invention] The present invention converts the rocking motion of a seat frame pivotally attached to a leg frame into a reciprocating motion via a link mechanism, and the coil spring provided on the leg frame. The shock absorbing mechanism is configured such that the spring is compressed by the reciprocating motion, and this swinging motion is transmitted to the backrest support frame through a simple connecting link provided within the seat frame. The chair can be formed without exposing the chair to the outside, and therefore the degree of freedom in terms of the shape and configuration of the chair design etc. is increased.

Further, the present invention can be suitably used in a so-called rotating chair for office use since the spring and the connecting link can be housed in the frame.

Since the present invention is as described above, it is extremely useful as an interlocking shock absorbing mechanism for a chair seat plate and a backrest.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a main part showing an example of the implementation of the present invention, FIG. 2 is an end view taken along the line A in FIG. 1, FIG. 3 is an end view taken along the line B-B in FIG. 4, and FIG. , FIG. 5 is a side sectional view of another example. 1...Leg frame, 2...Coil spring,
3, 4... Spring holder, 5... Tension rod, 6
... Pivot shaft attachment part, 7 ... Seat frame, 8 ... Leopard block, 9 ... Shaft, 10 ... Shaft, P ... Leg support, S ... Seat plate.

Claims (1)

[Claims] 1. The upper end of the leg frame is pivotally connected to the lower front surface of the seat plate, and the vertical swinging movement of the seat plate about the pivot portion is damped via a buffer such as a spring. In the chair, the upper end of the operating link whose lower end is pivotally connected to the leg frame is supported and guided by a guide formed horizontally on the lower surface of the seat plate, and the lower end of the operating link is attached to the upper end side of the operating link. An interlocking shock absorbing mechanism for a seat plate and a backrest, characterized in that the lower end of a backrest support member, which is pivotally mounted near the rear of the seat plate so as to be movable back and forth, is connected via a connecting link. 2 The pivot between the lower front surface of the seat plate and the upper end of the leg frame is as follows:
An interlocking shock absorbing mechanism for a seat plate and a backrest according to claim 1, wherein the front side of a seat frame attached to the lower surface of the seat plate is pivotally connected to the upper end of a leg frame. 3. The vertical swinging movement of the seat plate is achieved by pivoting the upper end of a lever block protruding from the lower front surface of the seat frame and a pivot shaft mounting portion formed upright at the tip of the leg frame, A patent that converts the compressive action of the shock absorber into the compressive action of the shock absorber by pivotally connecting the tip to the lower end of the block and connecting the rear end to the rear of the shock absorber disposed along the leg frame. An interlocking shock absorbing mechanism for a seat plate and a backrest according to claim 2. 4. The seat plate according to claim 2, wherein the vertical swinging motion of the seat plate is converted into a compressive action of the buffer body by installing a buffer body between the seat frame and the leg frame. Interlocking shock absorbing mechanism for backrest.