JP2000236978A - Chair with footrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair with a footrest having a backrest-footrest linkage mechanism for linking the movement of the backrest and the footrest so that the footrest is brought up horizontally when the backrest is brought down and the footrest is almost in the vertical condition (storage condition) when the backrest is brought up, capable of storing the footrest in the vertical condition to make the package size smaller by releasing the linkage of the linkage mechanism when the backrest is brought down, and capable of returning the link release condition to the linkage condition automatically only by bringing up the backrest. SOLUTION: A link lever 24 constituting the linkage mechanism of this chair is divided into a lever unit 24A and a lever unit 24B, which are connected to each other rotatably by a connecting shaft 31. A holding means is mounted for integrally holding the link lever units in a straight line when the lever is used in an ordinary condition, and the holding condition can be released by a releasing means. And a return means is also mounted for automatically returning the released lever units to the straight-lined condition by bringing up the backrest.

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 footrest and having a reclining mechanism for raising and lowering a backrest, wherein a reclining operation of the backrest and a rotating mechanism of the footrest are interlocked, and the footrest is interlocked with an operation of lowering the backrest. And a device for accommodating a footrest in conjunction with an operation of raising a backrest.

[0002]

2. Description of the Related Art With reference to FIGS. 11 to 14, a conventional reclining operation of a backrest and a rotation mechanism of a footrest are interlocked, and a footrest is lifted in conjunction with an operation of tilting a backrest and interlocked with an operation of raising a backrest. The configuration of a chair that accommodates a footrest will be described.

[0003] Reference numeral 1 denotes a seat frame (hereinafter referred to as a seat) serving as a frame of the seat, which is supported on a support frame 3 erected on a base frame 2. A backrest frame (hereinafter referred to as a backrest) 4 serving as a frame of a backrest is rotatably supported on a shaft 5 as a fulcrum behind the seat 1, and a footrest frame is provided at a front end of the seat 1. A footrest frame (hereinafter referred to as a footrest) 6 is rotatably supported by a shaft 7. The seat 1, the backrest 4, and the footrest 6 are cushions 50.
Covered with.

A reclining mechanism 8 for raising and lowering the backrest 4 is provided between the lower end of the backrest 4 and the lower front surface of the seat 1. The reclining mechanism 8 includes a case 9 and a rod 11 that moves inside the case 9 by a motor 10. One end of the case 9 is connected to a lower end of the backrest 4 by a shaft 12, and one end of the rod 11 is When the rod 11 moves in the direction in which the rod 11 is accommodated in the case 9, the backrest 4 falls down, and when the rod 11 moves in the opposite direction, the backrest 4 is raised.

A support frame 14 is fixed to the lower surface of the seat 1, and an operation lever 15 is rotatably supported by the support frame 14. One end of a link lever 17 is fixed to a shaft 16 of the operation lever 15. At the other end of the link lever 17, one end of a link lever 18 is pivotally supported by a shaft 19, and the other end of the link lever 18 is pivotally supported by a shaft 20 to the footrest 6.

At the lower end of the backrest 4, one end of a link lever 24 is further pivotally supported by a shaft 51.
4 is connected to one end of a link lever 25 by a shaft 26, and the other end of the link lever 25 is connected to the operation lever 1
5, and a push-up roller 27 is rotatably supported by a link lever 17.

FIG. 1 shows the state in which the backrest 4 is raised.
1, the link lever 25 and the push-up roller 27 are separated, but when the backrest 4 is tilted down by the reclining mechanism 8, the link lever 25 rotates counterclockwise about the shaft 16 to push the push-up roller 27. As a result, the link lever 17 rotates and lifts the footrest 6 via the link lever 18. FIG. 12 shows a state in which the backrest 4 is most down. Conversely, when the backrest 4 comes up, the footrest 6 returns to the state shown in FIG.

Here, the link levers 24 and 25 and the push-up roller 27 constitute a link mechanism for interlocking the reclining operation of the backrest 4 and the rotating mechanism of the footrest 6.

The footrest 6 is provided with an operation lever 15
Thereby, the turning operation can be performed irrespective of the raising / lowering operation of the backrest 4. That is, by rotating the operation lever 15 in the counterclockwise direction, the operation lever 15 is lifted regardless of the backrest 4. A shaft 19 connecting the link levers 17 and 18 is provided.
When the footrest 6 moves upward from a line connecting the shaft 16 of the operation lever 15 and the other end shaft 20 of the link lever 18, the footrest 6 attempts to rotate clockwise, and this movement causes the link lever 18 to rotate as shown in FIG. Abuts against the notch 23 formed at the other end of the link lever 17,
The footrest 6 is self-locked (self-locked) at this position.

By the way, when packing such a chair, the height increases when the backrest 4 is raised.
The backrest 4 is folded down for packing, but this causes the footrest 6 to be lifted as shown in FIG.

Therefore, conventionally, a shaft 51 which is a connecting portion between one end of the link lever 24 and the backrest 4 is removed, and the shaft 51 shown in FIG.
As described above, the link lever 24 is lowered, the support that lifts the footrest 6 is removed, and the footrest 6 is packed in a storage form as shown in the figure.

Therefore, a tool is required to remove the shaft 51, which is troublesome, and when the chair is used after being removed from the package, the removed link lever 24 must be connected to the backrest 4. It was very troublesome.

[0013]

SUMMARY OF THE INVENTION The present invention is intended to facilitate the compact packing by allowing the footrest to be easily stored in a state in which the backrest is tilted, and to facilitate unpacking and use. Another object of the present invention is to provide an extremely usable chair with a footrest which does not require any special operation so that the chair can be returned to a normal usable state only by raising the backrest.

[0014]

According to the present invention, there is provided a linkage mechanism for interlocking a reclining operation of a backrest with a rotation mechanism of a footrest. The linkage mechanism raises the footrest in conjunction with an operation of tilting the backrest, and lifts the backrest. Releasing means for releasing the linkage of the linkage mechanism with a chair adapted to store the footrest in conjunction with the raising operation;
There is provided a return means for automatically returning the released linkage in conjunction with the operation of raising the backrest.

With this configuration, the link of the link mechanism is released by the release means with the backrest down, so that the footrest can be put in the stored state. In addition, simply by raising the backrest, the link mechanism released by the return means automatically returns to the original state, so that the chair can be used without any special operation.

More specifically, one of the link levers constituting the linking mechanism is divided into two parts, and each of the two divided link levers is rotatably connected by a connecting shaft. Has a holding means for integrally holding the holding means so as to form a straight line, and the holding means releases the holding of the holding means.

With this configuration, when the holding means is released by the releasing means with the backrest tilted down, each link lever is bent around the connecting shaft, and has no function as a linking mechanism. Becomes stored.

Further, as the holding means, a holding lever is provided on one of the divided link levers for engaging with the other linear link lever, and the holding lever is operated to release the engagement. By doing so, the integration of both link levers is released. With this configuration, the holding means and the releasing means can be shared by one holding lever.

Further, the two link levers, which have been released from the integration, return to a straight line in conjunction with the operation of the backrest, and the holding lever provided on one link lever is automatically connected to the other link lever. Is to be engaged. With such a configuration, the chair returns to a normal usable state without any special operation.

Further, there is provided an urging means for urging the holding lever in a direction to always engage with the other link lever. With this configuration, it is possible to reliably perform the holding of the two link levers by the holding lever and the return operation in which the two link levers that have been released from the union return in conjunction with the operation of causing the backrest.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 9. The same components as those in the prior art will be denoted by the same reference numerals and description thereof will be omitted.

In the present invention, one of the link levers 24, 25 constituting a link mechanism for linking the operation of the backrest 4 and the operation of the footrest 6 is divided into two parts 24A and 24B, and each of the link levers 24A , 24B
Are rotatably connected by a connecting shaft 31. The two link levers 24A and 24B have a U-shaped cross section. One of the link levers 24A is disposed so that the open surface of the U-shape faces upward, and the other link lever 24B is formed.
Are arranged such that the open surface of the U-shape faces downward.

The connecting shaft 3 of the one link lever 24A
5, a laterally elongated slit 32 is formed as shown in FIG. 5, and one end 34 of a holding lever 33 is pivotally connected to the other side facing the slit 32 as shown in FIG. The tip of the holding lever 33 is
More protruding. With the protruding portion, the holding lever 33 can be swung right and left along the slit 32 with the one end 34 as a fulcrum.

As shown in FIG. 10, one end 34 of the holding lever 33 has a hole 3 provided on the other side of the link lever 24A.
A male screw 36 is screwed into this protruding portion, and a nut 38 is tightened to the male screw 36 via a washer 37, so that the holding lever 33 swings left and right around the one end 34 as a fulcrum. Configuration.

A washer 39 is attached to the center of the holding lever 33, and a coil spring 40 is provided between the washer 39 and the other side of the link lever 24A.
Is interposed. The coil spring 40 urges the holding lever 33 so as to be perpendicular to the link lever 24A.

A notch 41 as shown in FIG. 8 is formed at one end of the other link lever 24B near the connection shaft 31. The concave portion 4 at the tip of one side
The surface adjacent to 1 is an arc surface 42.

A toggle spring 43 is wound around a shaft 51 which is a connecting portion of one link lever 24A with the backrest 4. The toggle spring 43 applies a clockwise rotational force to the link lever 24A about the shaft 51 in FIG.

In a normal use state, as shown in FIGS. 4 and 5, both link levers 24A and 24B are in a straight line, and the side surface of the holding lever 33 is engaged with the concave portion 41. This engagement is achieved by the coil spring 40 urging the holding lever 33 so as to be perpendicular to the link lever 24A, or by the toggle spring 43 urging the link lever 24A clockwise. Holding lever 3
3 does not come off due to strong engagement with the concave portion 41, that is, both link levers 24A and 24B are integrated in a straight line.

Therefore, in this state, the integrated link levers 24A and 24B work in the same manner as the conventional link lever 24. FIG. 3 shows a state in which the backrest 4 has been raised, and FIG.
Indicates a state in which the backrest 4 has fallen.

Here, the holding lever 33, the coil spring 40 and the concave portion 41 are used during normal use.
A holding means for integrally holding the 4A and 24B so as to be linear is constituted. Further, the coil spring 40 serves as the urging means according to the fifth aspect.

In the state where the backrest 4 is tilted as shown in FIG. 2, when the projecting end of the holding lever 33 is swung to the left along the slit 32 as shown in FIG. Is disengaged and both link levers 2
The integration of 4A and 24B is released. As a result, as shown in FIG. 1, the footrest 6 cannot be supported while being lifted, the link levers 24A and 24B bend in a U-shape around the connection shaft 31, and the footrest 6 is in the housed state. .

Therefore, when packing, the footrest 6 can be stored by simply swinging the holding lever 33 in the state where the backrest 4 is tilted in this manner, and the compact packing can be performed by simple operation. Becomes possible.

Here, the holding lever 33 serves as a releasing means for releasing the linkage of the linkage mechanism for linking the reclining operation of the backrest 4 and the rotating mechanism of the footrest 6.
That is, the holding lever 33 is both a holding means and a releasing means.

Next, the case where the chair is used after unpacking from the packed state will be described. When the backrest 4 is raised, the link lever 24A starts to rotate clockwise via the toggle spring 43, and the angle formed by the two link levers 24A and 24B gradually decreases. When the holding lever 33 hits the circular arc surface 42 and retreats to the left against the coil spring 40, moves along the circular arc surface 42, and is rotated to a position corresponding to the concave portion 41 (both link levers 24A and 24B are moved). When it becomes linear, the spring 41 automatically engages with the concave portion 41 by the biasing force of the coil spring 40 or the toggle spring 43. Then, both link levers 24A and 24B are integrally held in a straight line.

Therefore, upon use, it automatically returns to a usable state without any special operation.

Here, the toggle spring 43, the coil spring 40, and the arc surface 42 automatically return the release state of the linkage mechanism for interlocking the reclining operation of the backrest 4 and the rotating mechanism of the footrest 6 in conjunction with the operation of raising the backrest. It is a component of the return means for causing the return.

[0037]

According to the present invention, the release means for releasing the linkage of the linkage mechanism for linking the reclining operation of the backrest and the rotation mechanism of the footrest, and automatic release of the released linkage in conjunction with the operation of raising the backrest Since it has a return means to make it stand, when packing it,
By releasing the linkage of the linkage mechanism by the release means,
The footrest can be stowed and compact packaging is possible with simple operation. In addition, when unpacking and using the product, simply by raising the backrest, the linkage mechanism released by the return means automatically returns to the original state and can be returned to the usable state, so there is no special operation Since it is not necessary, it is extremely excellent in usability.

[Brief description of the drawings]

FIG. 1 is a side view of a chair of the present invention when being packed.

FIG. 2 is a side view of the chair in a normal use state with a backrest fully depressed.

FIG. 3 is a side view of the chair with a backrest in a normal use state.

FIG. 4 is a plan view in a normal use state of a link lever constituting the link mechanism of the present invention.

FIG. 5 is a side view of the link lever in the same state.

FIG. 6 is a plan view when the link lever constituting the link mechanism of the present invention is released from being integrated.

FIG. 7 is a side view of the link lever in the same state.

FIG. 8 is an enlarged side view of a main part of the chair of the present invention in a state where the linkage of the linkage mechanism is released.

FIG. 9 is an enlarged side view of a main part when the linkage of the linkage mechanism of the chair is restored.

FIG. 10 is an enlarged sectional view of a main part showing a mounting state of a holding lever of the present invention.

FIG. 11 is a side view of a conventional chair in a state in which a backrest is raised.

FIG. 12 is a side view of the chair in a state where a backrest is turned down.

FIG. 13 is a side view showing a state in which the footrest of the chair is self-locked by being most lifted by an operation lever.

FIG. 14 is a side view when the chair is packed.

[Explanation of symbols]

 Reference Signs List 4 backrest 8 reclining mechanism 6 footrest 17 link lever 18 link lever 24 link lever 24A one link lever 24B the other link lever 25 link lever 27 push-up roller 33 holding lever 31 connecting shaft 40 coil spring 41 concave portion 42 arc surface 43 toggle spring

Claims (5)

[Claims] An interlocking mechanism for interlocking a reclining operation of the backrest and a rotation mechanism of the footrest is provided. The interlocking mechanism raises the footrest in conjunction with the operation of tilting the backrest, and lifts the footrest in association with the operation of raising the backrest. A chair with a footrest, wherein the chair is provided with a release means for releasing the linkage of the linkage mechanism and a return means for automatically returning the released linkage in conjunction with an operation of raising a backrest. 2. One of the link levers constituting the link mechanism is divided into two, and each of the two divided link levers is rotatably connected by a connection shaft. In normal use, both link levers are in a straight line. The chair with a footrest according to claim 1, further comprising holding means for integrally holding the holding means so that the holding means is released by the releasing means. 3. As the holding means, a holding lever is provided on one of the divided link levers to engage with the other linear link lever, and the holding lever is operated to release the engagement. The chair with a footrest according to claim 2, wherein the link levers are released from each other by doing. 4. The two link levers, which have been released from integration, return to a straight line in conjunction with the movement of the backrest, and the holding lever provided on one link lever automatically moves to the other link lever. 4. The chair with a footrest according to claim 3, wherein the chair is engaged with the chair. 5. The chair with a footrest according to claim 3, further comprising: urging means for urging the holding lever in a direction in which the holding lever always engages with the other link lever.