DE8808224U1 - Stepless height adjustment device, especially for upholstered furniture - Google Patents

Description

Utility model application

The invention relates to a parallel-acting stepless height adjustment by means of two pressure cylinders, in particular for seating furniture.

The purpose of this invention is to achieve a continuous adjustment of the seat height depending on the user’s wishes or body size.

This should also be provided on a tubular base, as is used in so-called cantilever chairs.

Continuously variable height adjustments for office chairs are known, whereby in these cases a pressure cylinder is arranged approximately centrally under the seat.

The invention was based on the task of finding an equally comfortable horizontal adjustment for a cantilever chair. /T

Since a central arrangement is not possible for a cantilever chair with a tubular base, the only option here was to install two pressure cylinders in parallel, whereby the simultaneous release posed a particular problem.

This object is achieved according to the invention in that two pressure cylinders are arranged in a preferably tubular base frame in such a way that they are connected to the seat body, which can be moved in height, via two guides.

A further embodiment is that the two pressure cylinders have a commercially available blocking device, which is both released together via a release lever that is connected to two pull levers via a connecting rod.

In order to ensure that both pressure cylinders are triggered simultaneously, the trigger mechanism can be adjusted on at least one side using, for example, an adjusting screw.

An embodiment of the invention is shown in the drawings and is described in more detail below. They show:

FIG.1

Seating furniture in oblique view, with the seat body (1) shown in the upper position and the dashed line in the lower position. The base frame (2) is made of tubular steel as a cantilever. The release lever (3) can also be seen, which in this case is located at the front left under the seat.

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Section AA as indicated in FIG ₄ 1«

It is shown how the force introduced by the 1w release lever (3) is
Connecting rod (4) is passed on to the pull levers (6). The connecting rod (4) is held in the bearing bushes (5), which in turn are firmly connected to the seat body (1).

FIG.3

Partial section through the base frame (2), showing how the height adjustment works.

The pressure cylinder (12), for example a commercially available infinitely adjustable gas spring, is held at its lower end in the base frame (2) by a cross pin (15).

The piston rod with release pin (11) is firmly connected to the
Guide (13). The guide (13) in turn slides on the base frame (2) with guide bushes (14). The rocker arm (9) is mounted on the top of the guide (13) with the axle (10), which presses on the release pin (11) when the release lever (3) is activated.

The connection between the rocker arm (9) and the pull lever (6) is formed by the pull cable (7), which can be adjusted using the adjusting screw (8).

Instead of the traction cable (7), a rigid rod can also be installed.

FIG.4

Representation as in FIG. 3”, however, the seat body (1) is from the lower in
upper position,

Claims (5)

-&igr; - Protection claims l.)£Continuously height-adjustable device, in particular for upholstered furniture, characterized in that two pressure cylinders (12) are arranged in a preferably tubular base frame (2) in such a way that they can be connected to the seat body (1) which is movable in height via two guides (13). 2.) Height adjustment device according to claim 1, characterized in that the two pressure cylinders (12) have a commercially available blocking device which can both be released together via a release lever (3) which is connected to two pull levers (6) via a connecting rod (4) mounted in bearing bushes (5), 3.) Height adjustment device according to claim 1 and 2, characterized in that the connection between the pull lever (6) and the release pin on the piston rod (11) is made by a rocker lever (9) that can be moved around the axis (10) and a pull cable (7) attached thereto, the pull cable (7) being fixable in length to the second pull cable (7) via an adjusting screw (8). 4.) Height adjustment device according to claim 3, characterized in that the connection between the pull lever (6) and the release pin on the piston rod (11) is made by, for example, a fixed rod, which can also be fixed in length to the second rod via an adjusting screw (8). 5.) Height adjustment device according to claims 1 to 4, characterized in that the lower end of the pressure cylinder (12) can be firmly connected to the base frame (2) via a cross pin (15) and the guide is slidably arranged on the base frame (2), which is preferably made of round tube, via guide bushes (14), which is connected to the piston rod of the pressure cylinder (12) for example via a thread. * &igr; * i &igr; t » » &igr; • II · I t I t * i Il i I &igr; I 1 * «««11* 1t • t * ti ii int iüi