JP2003189964A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To elongate service life, prevent abnormal sounds and backlash, or the like in a chair having a common synchronized tilting mechanism. <P>SOLUTION: The chair is provided with a support 4 arranged below a seat 2, a back frame 5 supporting a base end part 5a so that it can tilt between an erected attitude P and a backward tilted attitude Q on the support 4, and a swinging body 6 swingably suspended from the back frame 5. A front end part 2a of the seat 2 is rotatably supported by the support 4, a rear end part 2b of the seat 2 is rotatably supported by the swinging body 6, a seat back 3 is integrally attached to the back frame 5, and the seat 2 is interlocked with a tilting action of the seat back 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having a synchro tilt mechanism capable of synchronizing and tilting a backrest and a seat.

[0002]

2. Description of the Related Art Conventionally, chairs having various synchro-tilt mechanisms have been developed, but typically, a support for attaching legs and the like and a base end portion of the support which is tiltably supported. It is known to have a back frame and a seat in which a front end of the support is slidably and rotatably supported, and a rear end of the seat is rotatably supported near the base end of the back frame. However, this chair is configured such that the seat back end portion is pulled rearward and downward by the back frame to move by tilting the backrest fixed to the back frame.

[0003]

However, with such a structure, since there is a sliding portion, noise and rattling are likely to occur in the first place, and the product life is short, and reliability and stability are short. I don't like the lack of points.

Therefore, an object of the present invention is to provide a chair having a synchro tilt mechanism which is robust and highly stable.

[0005]

That is, a chair according to the present invention supports a base member disposed below a seat and a base end portion supported by the support member so as to be tiltable between a standing posture and a rearward leaning posture. And a swinging body suspended from the back frame so as to swing, the front side of the seat is rotatably connected to the support body, and the seat is located behind the connecting point. The backrest is integrally connected to or attached to the back frame while being rotatably connected to the swing body, and the seat is interlocked with the tilting motion of the backrest.

[0006] In such a case, since the synchro-tilt action is performed only by the rotational connection and there is no sliding portion, the quietness and the reliability are improved, the rattling is reduced and the sitting comfort is improved. Can also contribute.

Further, the elbow is integrated with or attached to the rocking body, so that the rocking body mounting structure and the elbow mounting structure can partially overlap each other.
For this reason, it is more advantageous to secure the attachment destination of the elbow and the attachment space as compared with the case where the rocking body and the elbow are separately supported on the seat or the like.

In order to improve the sitting comfort,
It is preferable that the back of the seat is set to sink as the backrest tilts rearward.

In addition, by providing a link mechanism for connecting the rear portion of the seat to the rear portion of the support body in a rotatable and slidable manner, it is possible to improve the operational stability during the synchro tilt.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to the drawings.

The chair I according to this embodiment is shown in FIGS.
As shown in FIG. 1, a leg 1 and a seat 2 supported by the leg 1,
A backrest 3 standing upright from the rear of the seat 2, a support 4 located below the seat 1, and a tilting motion of the support 4 between a standing posture P (FIG. 3) and a backward tilting posture Q (FIG. 4). Possible proximal end 5
A back frame 5 supporting a and a swing body 6 suspended from a central portion 5c of the back frame 5 so as to swing are provided. Then, the front end portion 2a of the seat 2 is rotatably supported by the support body 4, and the rear end portion 2b of the seat 2 is rotatably supported by the base end portion 6b of the rocking body 6, while The backrest 3 is fixed to the back frame 5 rotatably attached to the tip 6a of the moving body 6,
It is configured to be capable of synchro tilt.

The synchro tilt function in this embodiment means that when the seated person tilts the backrest backward (tilts backward), the seat tilts (tilts backward) so as to sink the rear portion. .

Explaining each part in detail, the support 4 includes a bottom plate 41 and the bottom plate 4 as shown in FIGS. 3, 4 and 8.
1 is made of a metal plate having side plates 42 that are integrally bent and erected from the side edges of the base plate 1. The upper end of the leg column 12 is attached to the rear portion 4b of the bottom plate 41 so that the leg column 12 can be supported. There is. The support 4 is covered with a lower cover 43 from below so that it cannot be directly viewed. Further, the lower cover 43 is attached to the seat outer shell 21, and a long hole is opened in the central portion thereof so that the leg support 12 can be penetrated.

The back frame 5 is integrally molded using a plastic material, and as shown in FIGS. 3 and 4, its back end portion 5a, that is, in the present embodiment, is located at the most forward and lowermost position in the standing posture. It is set so as to extend rearward and upward from the portion to be bent while being viewed in a side view, and the tip end portion 5b reaches substantially the height corresponding to the upper end of the backrest 3. The base end portion 5a includes a pair of plate-shaped frame elements 51 that are separated from each other in the left and right direction, and a connecting plate 52 that horizontally extends between the frame elements 51 and connects them. Then, a frame rotation extending in the horizontal direction is provided in a back frame rotation shaft hole 53 provided in the base end portion 5a of each frame element 51 and a back frame rotation shaft hole 44 provided in each side plate of the support body 4. The back frame 5 is rotatably supported by the support 4 by penetrating the axis R1. Here, "only rotation is possible" includes some rattling necessary for design or assembly. In addition,
In the present embodiment, the base end portion 5a of each frame element 51 is
Is set so as to be located inside each side plate 42 of the support body 4. Further, the distal end portion 5b continuously formed from the base end portion 5a is wider than the base end portion 5a, and has a backrest frame shape having a hollow portion that is open to the front and rear. In addition, as shown in FIG.
The claw portions 55 and 56 are formed on the surface of b, and the back inner shell 3
The backrest 3 can be attached via 1.

The oscillating body 6 includes a pair of oscillating elements 6B made of flat steel, which are separated from each other on the left and right, and a plastic inner cover 6A.
And the outer cover 6C. Then, the oscillating body rotating shaft R2 provided in the central portion 5c of the back frame 5 and extending horizontally in the left and right direction is passed through the oscillating body rotating shaft hole 62 provided in the inner cover 6A and the upper end portion 6a of the oscillating element 6B, It is suspended from the central portion 5c of the back frame 5 so as to be rotatable only around the upper end portion 6a. The oscillating body rotation axis R2 provided on the back frame 5 is a pair of convex portions 54 protruding on both side surfaces of the central portion 5c, and is integrally formed near the lumbar vertebra of the seated person. The convex portion 54 has a retaining groove 52,
Together with the retaining groove 61 provided on the upper end 6a of the rocking body 6,
The sealing S is used to prevent the swinging body 6 from coming off. In the present embodiment, each swing element 6 is
The upper end 6a of B is set to be located outside the back frame 5. Here, “suspend” means that the rotation center of the rocking body 6 with respect to the back frame 5 is positioned above the tip end that is the rotation end thereof.

As shown in FIGS. 3 and 9, etc., the seat 2 is provided with a rib RB on the inner surface thereof, and a seat outer shell 21 made of synthetic resin having rigidity added at least to support the load of the seated person.
A seat inner shell 22 elastically engaged with and fixed to the seat outer shell 21, a seat cushion 23 mounted on the upper surface of the seat inner shell 22, and a seat cushion 23 that covers the seat cushion 23 from above and sits down. And a seat cover 24 that forms a seat surface that supports the buttocks and thighs of a person. As described above, the front end 2a of the seat cover 24 is rotatably supported by the support 4 and the rear end thereof is supported. 2b is rotatably supported by the oscillating body 6.

More specifically, this seat outer shell 21
A front bearing portion 25 and a rear bearing portion 26 are provided at the front end portion of the lower surface and the rear end portion of the lower surface, respectively. Then, the front bearing portion 2
5, the seat front rotation shaft hole 27 and the support 4
The seat front part rotary shaft R4 extending horizontally in the left and right is fitted into the seat front part rotary shaft hole 45 provided at the front end part of the rear bearing part 26.
The seat rear part rotation shaft R3 extending horizontally in the left and right is fitted into the seat rear part rotation shaft hole 28 provided in the seat and the seat rear part rotation shaft hole 63 provided in the oscillating body 6, and the seat 2 is supported by the support member 4 and the rocker. The moving body 6 is supported.

Further, the rear portion 2b of the seat 2 is rotatably and slidably connected to the rear portion 4b of the support body 4 via a link mechanism R. More specifically, the pair of left and right link receivers 29 provided between the rotary shaft holes 28 located in the rear portions 2b of the left and right seats 2 and the rear end portions 7 of the pair of link elements 7.
The seat rear part rotation shaft R3 is fitted into the rotation shaft hole 71 provided in b, and the seat rear part rotation shaft hole 46 provided in the rear part 4b of the support 4 and the length provided at the front end parts 7a of the pair of link elements 7. The seat rear rotation shaft R5 is fitted in the rotation shaft hole 72 of the hole.

As shown in FIG. 3 etc., the backrest 3 is made of a synthetic resin back inner shell 31 having a rigidity sufficient to receive and support the load of a seated person, and the front surface 3 of the back inner shell.
1 and a back cover 34 that covers the back cushion 33 from the front and forms a backrest surface that supports the back of a seated person.
It is fixed to the above-mentioned back frame 5 so as to be capable of synchronous tilting.

Therefore, as described above, the synchro tilt mechanism has the support body 4, the back frame 5, and the swing body 6.
This is realized by the action of the four-sided link mechanism formed by connecting the seat 2 and the seat 2 rotatably to each other and having them function as a link member. In the present embodiment, this four-sided link mechanism is as follows. I am configuring.

That is, in this embodiment, the axis X1 which is the connecting axis between the support 4 and the back frame 5, the axis X2 which is the connecting axis between the back frame 5 and the rocking body 6, and the rocking body 6 and the seat 2. An axis X3 that is a connecting axis and an axis X4 that is a connecting axis between the seat 2 and the support body 4 are X4, X1, X from the front in a side view.
3 and X2 are arranged in this order, and X2 is located above the straight line L1 connecting X4 and X1, and X4
And X3 are located below the straight line L2 connecting X2 and X2. Further, in this embodiment, X1 and X2
X3 is located below the straight line L3 connecting with.

Then, when the back frame 5 is tilted from the standing posture P shown in FIG. 3 toward the backward tilting posture Q shown in FIG. 4, X2 rotates backward and downward around X1 and X2.
It will move in a direction away from 4. Then X3
Rotates around X2 and X4 and tilts the rear part b of the seat 2 rearward. Since the front end of the seat 2 is located in front of the connection point with the support body 4, the front end of the seat 2 slightly rises in this embodiment as the seat 2 tilts backward. Further, the link mechanism R causes X3 to rotate around X5 and slide, thereby tilting the rear end of the seat 2 rearward.

The chair I is provided with a reaction force device and an adjusting device (not shown) so as to be able to return from the backward tilting posture Q to the standing posture P, and to adjust the forces relating to the backward tilting and the standing posture.

Therefore, according to the chair of this embodiment having the above-described structure, since the four-sided link mechanism is formed and the synchro tilt function is performed only by the rotational connection, there is no sliding portion, and the life is long and the quietness is low. , Improved reliability,
Alternatively, it can contribute to reducing rattling and improving sitting comfort.

Further, the link mechanism R can improve the operational stability during the synchro tilt.

The present invention is not limited to the above embodiment.

Specifically, when the backrest is tilted backward, for example, by appropriately changing the positional relationship of the connecting points around the axes connecting the link members and the dimensions of the link members, the seat rises at the rear part. It is possible to easily provide a chair that performs an optimal movement according to the application and the place of use, such as a synchro tilt mechanism that causes the movement. This is derived from the fact that the chair according to the present invention has a structure with a great degree of freedom of design as compared with the conventional chair.

In addition to the above-described embodiment, it goes without saying that various shapes and materials of the respective parts such as the back frame, the support, and the rocking body can be considered.

For example, the same effect can be obtained by applying the present invention to a chair having a structure in which the back side of the seat and the backrest are integrated and the front side of the seat is separated.

Further, in the above-mentioned embodiment, the lower end of the backrest 3 is separated from the rear end of the seat 2, but the lower end of the backrest 3 and the rear end of the seat 2 are brought close to or in close contact with each other, and The moving body 6 and the seat 2 may be positioned near the connecting point. This is because, in this way, the lower end of the backrest 3 and the rear end of the seat 2 do not largely separate from each other and move in a continuous relationship despite the tilting motion.

Further, as shown in FIG. 11, an elbow 8 may be attached to the rocking body 6. In that case,
The base end portion of the elbow rod 81 is fixed to the base end portion 6b of the rocking body 6, and an elbow pad 82 is attached to the tip end portion of the elbow rod 81. Further, as shown in FIG. 12, the rocking body 6 and the elbow 8 may be integrally configured. This allows the mounting structure of the rocking body 6 and the mounting structure of the elbow 8 to partially overlap. For this reason, it is more advantageous to secure the attachment destination of the elbow and the attachment space as compared with the case where the rocking body and the elbow are separately supported on the seat or the like.

Others The present invention is not limited to the illustrated examples described above, and various modifications are possible.

[0033]

As described in detail above, according to the present invention,
Since the synchro-tilt action is performed only by the rotation connection and there is no sliding portion, it can contribute to quietness and reliability, as well as rattling reduction and sitting comfort.

Further, by constructing the swing body by integrating or mounting the elbow, it is possible to partially overlap the swing body mounting structure and the elbow mounting structure.
For this reason, it is more advantageous to secure the attachment destination of the elbow and the attachment space as compared with the case where the rocking body and the elbow are separately supported on the seat or the like.

Further, as the backrest tilts rearward,
The seat is designed so that the rear part of the seat is depressed, so that the sitting comfort can be improved.

In addition, by providing the link mechanism for connecting the rear portion of the seat to the rear portion of the support in a rotatable and slidable manner, it is possible to improve the operational stability during synchro tilt.

[Brief description of drawings]

FIG. 1 is a front view of a chair according to an embodiment of the present invention.

FIG. 2 is a side view of the chair according to the same embodiment.

FIG. 3 is an exploded perspective view of the same embodiment.

FIG. 4 is an operation explanatory view seen from the side for explaining the operation of the chair in the same embodiment.

FIG. 5 is an operation explanatory view seen from the side for explaining the operation of the chair in the embodiment.

FIG. 6 is a side view of a support according to the same embodiment.

FIG. 7 is a side view of the back frame in the same embodiment.

FIG. 8 is a side view of the oscillating body in the same embodiment.

FIG. 9 is a side view of a seat outer shell according to the same embodiment.

FIG. 10 is a side view of the link element according to the same embodiment.

FIG. 11 is a schematic side view of a chair according to another embodiment of the present invention.

FIG. 12 is a schematic side view of a chair according to another embodiment of the present invention.

[Explanation of symbols]

I ... Chair 2 ... 2b ... rear 3 ... back 4 ... Support 4b ... rear 5 ... Back frame 5a ... Base end 6 ... Oscillator P: Standing posture Q: Backward tilt

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nobuyuki Ueda             6-1, 1-1 Minami Oimazato, Higashinari-ku, Osaka             Kuyo Co., Ltd. (72) Inventor Taiki Fukuda             6-1, 1-1 Minami Oimazato, Higashinari-ku, Osaka             Kuyo Co., Ltd. F-term (reference) 3B091 AA04 AB04 AC04                 3B099 AA02 BA09 BA11 CA36

Claims (4)

[Claims] 1. A support body disposed below a seat, a back frame having a base end portion supported by the support body so as to be tiltable between a standing posture and a rearward leaning posture, and swingable from the back frame. And a oscillating body suspended from the seat, the front side of the seat is rotatably connected to the support body, and the seat is rotatably connected to the oscillating body behind the connection point, while A chair characterized in that a backrest is integrated with or attached to a frame so that the seat is interlocked with the tilting motion of the backrest. 2. The chair according to claim 1, wherein an elbow is integrated with or attached to the swing body. 3. The chair according to claim 1, wherein the back of the seat is set so as to be depressed as the backrest tilts rearward. 4. The chair according to claim 1, further comprising a link mechanism for connecting the rear portion of the seat to the rear portion of the support body so as to be rotatable and slidable.