JPH0539Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a seat height-adjustable chair that allows the seat height to be changed depending on the purpose and use.

[Prior Art] Conventionally, this type of chair has been constructed by making the support of the main body of the chair expandable and retractable, and changing the length of the support by using a screw-feed type or gas spring type lifting/lowering position adjustment mechanism. The seat height can be adjusted. This allows the chair to be used appropriately depending on the purpose and use.

[Problem that the invention aims to solve] By the way, in general, when the same person uses multiple chairs, the dimensions of each chair (seat height plus seat depth) for that person are the same, regardless of the type. It is said that sitting at a specific value according to the person's physique is the most comfortable and desirable. However, in the conventional type, the seat can be used only by adjusting the height, which causes some inconvenience in the sitting posture.

The object of the present invention is to solve the above-mentioned problems and provide a chair that provides comfortable sitting comfort depending on the purpose and use.

[Means for Solving the Problems] In order to achieve the above-mentioned objects, the present invention provides a seat height-adjustable chair in which a lifting device is interposed between the chair body and the seat. The device is connected to a pair of left and right X-link mechanisms each having first and second link members pivotally connected to each other at the center, and the first and second link members of each of these X-link mechanisms. and a lifting position adjustment mechanism configured to fix both link members at a fixed intersecting angle position and to change the fixed angle position by operating the operating section, The upper and lower ends of the first link member, which is in the posture of It is characterized in that the front part of the main body and the rear part of the seat are respectively rotatably and slidably supported.

[Function] With this configuration, the lower end of the first link member of the X-link mechanism is pivotally connected to the rear part of the chair body, and the lower end of the second link member is rotatably and slidably supported by the front part of the chair body. Therefore, by operating the operation part of the elevation position adjustment mechanism, the first link member rotates about its lower end, and the lower end of the second link member rotates correspondingly. and slide, the X-link mechanism can change its intersection angle.

The front part of the seat is pivotally connected to the upper end of the first link member of such an X-link mechanism, and the rear part is rotatably and slidably supported by the upper end of the second link member. The above-mentioned first part assumes a posture of rising forward while maintaining a horizontal posture.
It becomes possible to operate by following the movement of the upper end (front end) of the link member.

That is, the seat moves backward as it rises and moves forward as it descends.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, this chair includes a chair body 1, a seat 2 that can be raised and lowered relative to the chair body 1, and a seat 2 that can be raised and lowered between the seat 2 and the chair body 1. It is equipped with a device 3.

The chair body 1 is, for example, made of wood and has an integral backrest 11, and a horizontal seat support 12 located below the seat 2 has front and rear horizontal members 14, 15 between the left and right side plates 13. It is constructed in the form of a frame. And, the seat support part 12 of this chair body 1
The elevating device 3 is provided between the seat 2 and the seat 2.

The elevating device 3 includes a pair of left and right X link mechanisms 4 that connect the seat 2 to the chair body 1 in order to raise and lower it in a constant posture, and an elevating position adjustment mechanism 5 that allows the elevating position of the seat 2 to be changed by manual operation. It is equipped with.

As shown in Figs. 3 and 4, each X-link mechanism 4 comprises a first link member 41 in the form of an elongated plate,
The first link member 41 is pivotally connected to a second link member 42, which is also in the form of a long, narrow plate, at its center by a fulcrum pin 43. As shown in Figures 2 to 4, the upper end 41a and the lower end 41b of the first link member 41, which is in a raised-front position, are pivotally attached to the front of the seat 2 and the rear of the chair body 1 via an upper bracket 6 and a lower bracket 7, respectively. At the same time, the lower end 42a and the upper end 42b of the second link member 42, which is in a lower-front position, are rotatably and slidably supported to the front of the chair body 1 and the rear of the seat 2 via the lower bracket 7 and upper bracket 6, respectively.

Specifically, the upper end 41a and lower end 41b of the first link member 41 are pivotally connected to the vicinity of the front end of the corresponding upper bracket 6 and the vicinity of the rear end of the lower bracket 7 via pins 41c and 41d. The lower bracket 7 is supported by a seat support portion 12 provided on the chair body 1. Further, pins 42c and 42d are horizontally protruded from the lower end 42a and upper end 42b of the second link member 42, respectively.
2d is rotated and slid into a horizontal elongated hole 71 extending in the front-back direction provided near the front end of the lower bracket 7 and a horizontal elongated hole 61 extending in the front-rear direction provided near the rear end of the upper bracket 6, respectively. It is possible to insert it. In addition, between the lower end portions of the first link member 41 and between the upper end portions of the second link member 42, there are connecting bars 44 for preventing the left and right X link mechanisms 4 from moving differently. 45 have been constructed respectively. The connecting bars 44 and 45 are pipe-shaped and are rigidly attached to the corresponding link members 41 and 42 by welding. The lift position adjustment mechanism 5 is attached to the link members 41 and 42 of the X link mechanism 4 constructed as described above.
Stays 51 and 52, which will be described later, are engaged with each other.

As shown in FIG. 3, the elevating position adjustment mechanism 5 is
An upper stay 51 installed between the first link members 41 of both the X-link mechanisms 4, a lower stay 52 located below this lower stay 51 and installed between the second link members 42, and this lower stay A screw shaft 53 is screwed into a vertical screw hole 52c provided in the upper stay 52, and has an upper end 53a connected to the upper stay 51 so as to be rotatable and immovable in the axial direction.
Then, by rotating this screw shaft 53, both stays 5
It is provided with an operation handle 54 which is an operation section for changing the distance between 1 and 52. Upper stay 51
is in the shape of a rectangular pipe, and connecting pins 51b are provided protruding from end plates 51a covered on the left and right sides thereof. Then, connect the connecting pin 51b to the first link member 4.
It is rotatably connected to 1. Lower stay 52
is in the shape of a rectangular pipe, and connecting pins 52b are provided protruding from end plates 52a covered on the left and right sides thereof. Then, connect the connecting pin 52b to the second link member 4.
It is rotatably connected to 2. Note that a nut (not shown) is embedded in the center of the lower stay 52 to form the screw hole 52c.

Next, the operation of this embodiment will be explained. As shown in FIGS. 2 and 3, when the seat 2 is raised, the operating handle 54 is rotated in a desired direction to lower the screw shaft 53 into the screw hole 52c. The screw shaft 53 uses the lower stay 52 as a foothold to pull the upper stay 51 downward. As a result, in the X link mechanism 4, the first link member 41 rotates about the lower end 41b, and the lower end 42a of the second link member rotates and slides accordingly, and both link members 4
1 and 42 operate in the direction of decreasing the crossing angle. If rattling and deflection of various parts are ignored, the seat 2 is maintained in a horizontal position by the position maintaining action of the X link mechanism 4, and follows the upper end 41a of the rotating first link member 41. As the chair rotates and descends, it advances forward relative to the chair body 1 as shown in FIG.

Further, when the operation handle 54 is rotated in the opposite direction, the screw shaft 53 is screwed into the screw hole 52c and raised, and the seat 2 is raised while maintaining the horizontal position by the operation opposite to the above, At the same time, the chair body 1 is evacuated rearward as shown in FIG.

In this way, the seat 2 can be moved forward and backward with respect to the chair body 1 in addition to the up and down movement, but with this configuration, the seat 2 can be adjusted to a high position for office use. When the seat 2 is adjusted to a lower position for comfort, the seat 2 moves backward relative to the chair body 1 and the depth of the seating area becomes shallower. However, when the seat 2 is adjusted to a lower position for comfort, the seat 2 moves forward relative to the chair body 1. As it moves forward, the seating area becomes deeper. Therefore, with such a chair, the dimensions of the seat height plus the seat depth do not change significantly, making it possible to obtain a comfortable sitting position depending on the purpose and use. .

The cross-sectional shape of each link member and stay is
The present invention is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

[Effects] Since the present invention has the above configuration, the following effects can be obtained.

That is, the upper and lower ends of the first link member, which is in a forward-looking position, are pivotally connected to the front part of the seat and the rear part of the chair body, respectively, and the lower and upper ends of the second link member, which is in a forward-downward position, are connected to the chair body. Since the front part of the main body and the rear part of the seat are rotatably and slidably supported, the seat can move forward and backward relative to the chair main body depending on the height. As a result, when the seat is adjusted to a high and low position for office use, the seat retreats to the rear of the chair body, reducing the depth of the seating area, and when the seat is adjusted to a low position for comfort, the seat is It moves forward in relation to the main body, and the seating area becomes deeper.

The present invention is designed to automatically adjust the depth of the seating area according to the height of the seat, thereby providing a seat height adjustable system that can provide optimal sitting comfort depending on the purpose and use. Chairs can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a sectional view taken along line A-A in FIG. 5
The figures are action explanatory diagrams corresponding to FIG. 3 and FIG. 2, respectively. 1...Chair body, 2...Seat, 3...Elevating device,
4...X link mechanism, 5...Elevating position adjustment mechanism,
41...First link member, 42...Second link member, 41a...Top end, 41b...Bottom end, 42
a...lower end, 42b...upper end, 54...operation unit (operation handle).

Claims (1)

[Claims for Utility Model Registration] A seat height-adjustable chair comprising a lifting device interposed between the chair body and the seat, the lifting device being connected to a first and a first seat pivotally connected to each other at the center. A pair of left and right X-link mechanisms each having two link members, and a first and second link member of each of these X-link mechanisms are connected to each other and both link members are fixed at a constant intersection angle position. and an elevating position adjustment mechanism configured to be able to change the fixed angular position by operating an operating part, and the upper and lower ends of the first link member, which is in a forward-upward posture, are The lower end and the upper end of the second link member, which is pivotally connected to the front part of the seat and the rear part of the chair body and has a forward-sloping posture, are rotated and slid to the front part of the chair body and the rear part of the seat, respectively. A chair with an adjustable seat height.