Grammer Ag

Grammer Sitzsysteme Gmbh

Josef Dotzler

Johann Meier

Johann Grassl

A vehicle seat which is adjustable in height and which affords automatic adjustment to the seat occupant weight comprises a gas spring between a seat frame and a base frame, a valve arrangement actuable by an actuating element to adjust the pressure in the gas spring in dependence on the weight of the seat occupant, and a means for setting the desired seat height. Disposed between the seat and base frames is a belt reel device with a coupling means, which like the gas spring, can be subjected to the action of pressure gas from a pressure source. The pressure source comprises a compressor driven by a drive motor, which are disposed on the vehicle seat. The valve arrangement includes a 2/2-way valve which serves only for the release of pressure gas from the gas spring, and a 3/2-way valve between the pressure source and the coupling means of the belt reel device. The valve arrangement may be mechanical/pneumatic in operation or may be controlled by an electronic control arrangement.

Vehicle seat which is adjustable in height and with automatic weight

A springing arrangement comprises a coil spring and a spring-engaging member acting thereon between the two ends of the spring and in a direction which differs from the longitudinal direction of the spring, thereby to provide non-linear dependency of the spring force on the distance covered by the spring-engaging member. The spring-engaging member is made up of two elements on respective sides of the spring, each element bearing against the spring by way of a curved surface and extending over a plurality of turns of the coil spring.

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Amberg, Germany

Josef Dotzler