Chair

Abstract

The utility model relates to chair furniture, in particular to an office chair with a rotatable backrest, which provides a comfortable sitting posture for a user. The chair comprises a backrest and a seat which is located on a base with a central supporting column and connected with the backrest, the central supporting column is provided with a swing mechanism, the swing mechanism comprises a supporting platform and a supporting box installed on the supporting platform, the supporting box is fixedly provided with the base, and the base is composed of two side plates matched with the bent shape of the backrest. The bottom, the middle and the top are rigidly connected through profile pipes, a first transverse plate and a second transverse plate respectively, the backrest frame is fixed in a hinged connection mode at the position, at the height of the second transverse plate, of the base, and the axis of the hinged connection is located in the middle of the height of the backrest. A pneumatic lifting module is arranged between the second transverse plate and the backrest frame transverse plate. Adjusting screws are installed on a first transverse plate of the base and used for supporting and adjusting the initial position and the stop position of the backrest. According to the design of the chair, a comfortable back position can be provided for a user when different sitting postures are adopted.

Description

[0001] The utility model belongs to a seat furniture, especially an office chair with a rotatable backrest, which can provide a comfortable sitting posture for users.

[0002] Known adjustable chairs with backrest supports include a seat for supporting the user, a backrest, a base, and a control device mounted on the base. The control mechanism connects the backrest to the seat and includes a device for adjusting the tilting resistance so that the user can move the backrest backward from the vertical position. The resistance adjustment device includes an elastic element that bears the load when the chair tilts to provide resistance against the tilting force (US 8297701 B2, IPC A47C1 / 32, issued on October 19, 2010).

[0003] The disadvantages of such chairs are the complexity of the backrest tilting resistance adjustment device. In addition, the chair cannot provide sufficient comfort for the user's back position.

[0004] Known rocking-back chairs (RU 2437605, IPC A47C1 / 032, issued on December 27, 2011) include a support structure, a seat, a backrest with a support, and an elastic device. The seat is connected to the support structure through a hinged parallelogram connecting member, including a first arm and a second arm, to ensure the movement of the seat between the lowered position and the raised position. The backrest is arranged to be able to slide between the vertical position and the reclined position. Moving the backrest to the reclined position causes the seat to move to the raised position, and vice versa. The elastic device returns the seat to the lowered position and the backrest to the vertical position. The seat has a sliding support, which is installed in such a way that when the backrest support reclines, it causes the sliding support to descend relative to the seat support.

[0005] The disadvantage of the known design is the limited rotational ability of the backrest, which does not provide sufficient flexibility when adopting different sitting postures.

[0006] Known office chairs (EP 2787860, IPC A47C 1 / 032, issued on January 10, 2018) include a backrest, a seat connected to the backrest, and a connecting component connecting the backrest and the seat. The connecting component is designed to elastically counteract the rotational movement of the backrest. The connecting component rotates the seat surface relative to the backrest by a specified ratio, so that when the backrest rotates, the backrest and the seat surface open at an angle relative to each other.

[0007] Such office chairs also cannot provide sufficient comfort and flexibility when adopting different sitting postures.

[0008] The problem to be solved by the utility model is to provide a chair that is reliable and convenient to use.

[0009] The technical result is to provide a comfortable back position when adopting different sitting postures.

[0010] This chair solves this problem and achieves technical results. The chair includes a backrest and a seat that is functionally connected to the backrest. The seat is located on a base with a central pillar, and a swing mechanism is provided on the central pillar. The swing mechanism includes a support platform, a support box is installed on the support platform, and a backrest base is fixed on the support box. The backrest base is composed of two side plates, and the shapes of the two side plates match the curved shape of the backrest. The two side plates are rigidly connected by a profile tube at the bottom, and are rigidly connected by a first transverse plate and a second transverse plate in the middle and at the top respectively. At the height of the second transverse plate 13 on the backrest base, a backrest frame is fixed by a hinge connection, so that the axis of the hinge connection is located in the middle of the backrest height; a pneumatic lifting module is installed between the second transverse plate of the backrest base and the upper transverse plate of the backrest frame; an adjusting screw is installed on the first transverse plate of the backrest base for supporting and adjusting the initial position and stop position of the backrest.

[0011] According to the chair of the present utility model, the support box can be fixedly connected to the support platform of the swing mechanism by bolt connection.

[0012] According to the chair of the present utility model, the side plates of the backrest base can be connected to the profile tube and the transverse plate by welding.

[0013] The essence of the present utility model can be illustrated by the overall view of the chair.

[0014] The chair includes a backrest 1 and a seat 2. The seat 2 is located on a five-beam base 3 equipped with rollers 4. The base has a central pillar 5, and a swing mechanism 6 is located on the central pillar 5. The swing mechanism 6 includes a support platform 7 and a support box 8 installed on the support platform. A backrest base 9 is fixed on the support box 8. The backrest base 9 is composed of two side plates 10 whose shapes match the curved shape of the backrest. The two side plates are rigidly connected by a profile tube 11 at the bottom, and are rigidly connected by a first transverse plate 12 and a second transverse plate 13 in the middle and at the top respectively. At the height of the second transverse plate 13 on the backrest base, a backrest frame 15 is fixed by a hinge connection 14, so that the axis of the hinge connection is located in the middle of the backrest height. This position of the hinge connection ensures the redistribution of the load on different back muscle groups when the user leans on the backrest. A pneumatic lifting module 17 is provided between the second transverse plate 13 of the backrest base and the upper transverse plate 16 of the backrest frame, which can ensure the smooth rotation of the backrest around the axis of the hinge connection 14. An adjusting screw 18 is installed on the first transverse plate 12 of the backrest base for supporting and adjusting the initial position and stop position of the backrest.

[0015] Therefore, the present utility model provides a reliable and comfortable chair design that provides a comfortable back position for the user when adopting different sitting postures.

Claims

1. A chair, comprising a backrest and a seat functionally connected to the backrest, the seat being located on a base having a central pillar, a swing mechanism being provided on the central pillar, the swing mechanism comprising a support platform and a support box mounted on the support platform, a backrest base being fixed on the support box, the backrest base being composed of two side plates whose shapes match the curved shape of the backrest, the two side plates being rigidly connected at the bottom by a profile tube, and being rigidly connected at the middle and top by a first transverse plate and a second transverse plate respectively, at the height of the second transverse plate on the backrest base, the backrest frame is fixed by a hinge connection such that the axis of the hinge connection is located in the middle of the backrest height; a pneumatic lifting module is installed between the second transverse plate of the backrest base and the upper transverse plate of the backrest frame; an adjusting screw is installed on the first transverse plate of the backrest base for supporting and adjusting the initial position and the stop position of the backrest.

2. The chair according to claim 1, characterized in that, The support box is fixed on the support platform of the swing mechanism by a bolt connection.

3. The chair according to claim 1, characterized in that, The side plates of the backrest base are connected to the profile tube and the transverse plates by welding.

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