Chair

Abstract

Chair comprising: - an elastically deformable seat (14), - a backrest (10), and - a mechanism acting between the seat (14) and the backrest (10) of the chair, by which the tilting resistance of the backrest (10) depends on a load on the seat (14) by a user, by which a force caused by the seat (14) acting as a spring is exerted on the backrest (10), which returns the backrest (10) forward to a starting position when the seat (14) is not loaded by the user, and by which the seat (14) is at least partially raised depending on a load on the backrest (10) and causes an upward curvature of the seat (14), and wherein the seat (14) is bent downwards from its edges to the center in a front view when the backrest (10) is not loaded.

Description

[0001] The invention relates to a chair, in particular an office chair, with a mechanism acting between the seat and backrest of the chair, whereby the tilting resistance of the backrest depends on the load on the seat by the user. The seat is at least partially raised depending on the load on the backrest.

[0002] Chairs of this type, in which the force with which the user loads the seat is transferred to the backrest, are known from various patent specifications (DE 4041157 A1, US 7,926,879, US 8777312).

[0003] In these devices, power transmission is achieved through a relatively complex mechanism, which also usually requires an additional energy storage device, such as a spring.

[0004] The invention is therefore based on the objective of proposing a chair of the type mentioned above, whose mechanism is simple and does not require an additional power storage device.

[0005] According to the invention, this problem is solved by the mechanism causing the elastically deformable seat surface to curve upwards. This curvature ensures that the user is lifted when the backrest is loaded.

[0006] The dependent claims specify preferred embodiments.

[0007] The invention is explained below with reference to a preferred embodiment shown in the drawing.

[0008] This shows: Fig. 1 A schematic view of the chair in a side view with the backrest unloaded. Fig. 2 A schematic view of the chair in a side view with the backrest under load. Fig. 3 A schematic view of the chair in a front view with the backrest unloaded. Fig. 4 A schematic view of the chair in a front view with the backrest under load.

[0009] The chair shown consists of a backrest. 10 , which is from the long thigh 10a a pair of L-shaped levers 12 is worn, with an elastic seat surface 14 and one the seat area 14 supporting frame 16 The free end of the short legs 10b of the joint points 18 with the frame 16 connected L-shaped lever 12 This has a direct effect on the seat surface 14. The seat surface 14 This happens when the backrest is under load. 10 arched upwards and thus essentially raised in the middle.

[0010] The seat is attached via hinges. 20 with the frame 16connected, the hinges 20 They form pivot points that absorb the vertical forces that occur.

[0011] In the illustrated embodiment, the two L-shaped levers 12 connected by a bar 19 together which in their middle rests on the downward concave seat 14 It works. When the backrest is under load 10 This will thus change the seating area 14 The seat surface is curved upwards against its own elasticity and against the load acting upon it. This curvature ensures that the user is lifted. This curvature is evenly distributed across the entire surface of the seat. 14 trained, were placed in the seat area 14 a multitude of grooves 21 essentially perpendicular to the plane of the backrest 10 inserted. Conversely, the backrest is 10 when the seat surface is under load 14against the user's pressure on the backrest 10 Force applied, pushed forward.

[0012] Without putting any pressure on the seat surface 14 The user adjusts the backrest 10 due to the elasticity of the seat surface 14 returned to its starting position. The seat surface thus acts as a spring.

[0013] A fixed connection between backrest 10 and seat area 14 is not given. The only joint is the one between the lever. 12 and the frame 16

[0014] The chair proposed here can be designed to be stackable. The mechanism consists of only a few parts and requires no additional height. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 4041157 A1

[0002] US 7926879

[0002] US 8777312

[0002]

Claims

[1] Chair, in particular office chair, with a mechanism acting between the seat (14) of the chair and the backrest (10) of the chair, by which the tilting resistance of the backrest (10) depends on the load on the seat (14) by the user. The seat (14) is raised at least partially depending on the load on the backrest (10), characterized by The mechanism causes the elastically deformable seat surface to curve upwards. This curvature ensures that the user is lifted when pressure is applied to the backrest. [2] Chair according to claim 1, characterized by , that the backrest (10) is supported by the long leg of at least one L-shaped lever (12), the short leg (10b) of which acts directly on the seat (14) with its free end. [3] Chair according to claim 2, characterized by , that the lever (12) is (are) articulated to a frame (16) of the chair. [4] Chair according to any of the preceding claims, characterized by , that the seat surface (14) is provided with a plurality of weakenings oriented substantially perpendicular to the plane of the backrest (10) so that the elastic curvature of the seat surface (14) is formed uniformly over the entire extent of the seat surface (14). [5] Chair according to claim 4, characterized by , that the weaknesses are formed as grooves (21).

Images