Grammer Ag

Hubert Wittmann

Roland Übelacker

Tobias Stahl

Konstantin Lorey

Konstantin Krivenkov

Johann Meier

Manfred Schlierf

Nikolaus Haller

Roland ÜBelacker

Rupert Bauer

Volkhart Meyder

Christian Strohal

Martin Hegen

Volkhardt Meyder

Johanna Trepschick

The invention relates to a method for monitoring a state of wear of a damping device within a system. The system includes a vehicle seat having a first portion which is movably mounted in at least one direction with respect to a second portion, a damping device for damping oscillations is arranged between the first portion and the second portion, and a first sensor that determines an instantaneous relative position of the first portion with respect to the second portion. A displacement function in relation to the relative position of the first portion with respect to the second portion is defined as a function of time, and a current value of the displacement function is determined at selected intervals and summed. The sum is compared with a predetermined first limit.

Method for monitoring a state of wear of a damping device

The invention relates to a system for seat occupancy detection, comprising a vehicle seat for a driver with an upper part and at least one suspension-damper system, wherein an acceleration sensor is arranged on the upper part and is designed to detect a characteristic of an acceleration of the upper part as a function of a time, an evaluation unit being provided which is designed to generate an evaluation of the characteristic of the acceleration and optionally to transmit a signal to a higher-level control unit, the evaluation unit also being designed to assign the evaluation to one of several states, wherein the states are selected from a group comprising an occupied state and an unoccupied state of the vehicle seat.

Seat occupancy detection with acceleration signal

The invention relates to a system for seat occupancy detection, comprising a vehicle seat for a driver with an upper part and at least one suspension-damper system, an acceleration sensor being arranged on the upper part which is designed to determine a characteristic of an acceleration of the upper part as a function of time, an evaluation unit being provided which is designed to create an evaluation of the characteristic of the acceleration and optionally to send a signal to a higher-level control unit, the evaluation unit also being designed to assign the evaluation to a value of a mass of an object with which the vehicle seat is currently occupied.

The invention relates to a vehicle seat having a roller guide which has at least one guide rail which is at least partially sideways open and at least one running roller rolling in the guide rail, connected to parts of the vehicle seat via an axle member, wherein a running surface of the running roller is rollable along a roller-underside inner wall of the guide rail arranged parallel or at an angle to a middle axle of the running roller, wherein the running roller comprises at least a first area and a second area, wherein the first area forms at least a part of the running surface and the second area is arranged in a radial direction of the running roller at least partially between the axle member and the first area and in contact with both. According to the invention, an electrical conductivity of the first area is lower than an electrical conductivity of the second area.

Vehicle seat having a roller guide

A vehicle seat comprising a device for levelling the vehicle seat is provided. The vehicle seat including an upper seat element, which can be moved relative to a lower seat element by a first air spring and on which a mass can be arranged The lower and the upper seat element are arranged at a predetermined distance from one another, and the first air spring is fluidically connected to an additional volume of an additional volume module by a first fluid connection. The internal pressure of the first air spring is controllable by the additional volume module. The device comprises a limited auxiliary volume, which is fluidically coupled to the additional volume by means of a fluid conveying unit and a second fluid connection, it being possible, when the distance changes between said seat elements due to a shift in weight of the mass on the upper seat element, to change the internal pressure of the additional volume and, indirectly, of the first air spring by a fluid being conveyed between the auxiliary volume and the additional volume by means of the fluid conveying unit in order to compensate for the change in distance.

Vehicle seat comprising an additional volume for levelling and stabilization

The invention relates to a seat suspension device for a vehicle seat, in particular a commercial vehicle seat, comprising at least one air spring, said air spring being disposed between an upper seat portion of the vehicle seat and a lower seat portion of the vehicle seat, and at least one hose-like member connected to the air spring via a first connection line for an extension volume of the air spring is provided, said hose-like member being arranged along at least one fold of a bellows-like facing extending between an upper seat portion and a lower seat portion of a vehicle seat.

Growing community of inventors

Amberg, Germany

Hubert Wittmann