A device for level regulation and level stabilization of a vehicle seat upper part. The device includes an air spring that spring loads a movement of the vehicle seat lower part and of the vehicle seat upper part relative to one another, the vehicle seat lower part and the vehicle seat upper part are arranged in a non-deflected state at a predeterminable distance from one another. The air spring is fluidically connected to a working volume of an additional volume module. A control unit decreases the volume of the working volume in the event of an increase in the distance and increases the volume of the working volume in the event of a decrease in the distance such that the pressure in the air spring can be changed such that the distance between the vehicle seat upper part and a reference surface is substantially unchanged.

The present invention relates to an aircraft seat comprising: a guide rail (26); a rack (34); an actuator (30) provided with a gear (31); at least one connection portion (35) providing a mechanical connection between the guide rail (26) and the rack (34),
characterized in that the connection portion (35) included a zone (36) of mechanical weakness and in that a first bearing element (37) and a second bearing element (38) are disposed on either side of the rack (34), such that, if the deformation of the seat generates a movement of the gear (31), said gear (31) or the corresponding shaft (32) comes into abutment against one of the bearing elements (37, 38) and in this way deforms the connection portion (35) along the zone (36) of mechanical weakness.

A height adjusting mechanism (100) is provided for a vehicle seat (1), in particular for a utility vehicle seat, including a scissors-type frame (3). The height adjusting mechanism (100) includes a gas spring (12) that cooperates with the scissors-type frame (3) as well as a valve device (40) for ventilating and/or evacuating the gas spring (12). The valve device (40) is located on a control unit (110). The control unit (110) includes a control element (82) for actuating the height adjusting mechanism (100). A vehicle seat (1) is also provided including a height adjusting mechanism (100).

Roller guide comprising at least one guide rail, which has at least one first and one second planar region, and comprising a first and a second roller, which are each in contact with the guide rail and roll thereon, wherein the first and the second roller are mounted so that they are rotatable about a common axis of rotation and are formed rotationally-symmetrically about the axis of rotation and a radius of the first roller is smaller than a radius of the second roller, the first roller has a first circular-segment-shaped surface rolling region and the second roller has a second circular-segment-shaped surface rolling region and a centre point of the first surface rolling region and a centre point of the second surface rolling region are arranged on the axis of rotation.

An active suspension system comprises at least one biasing device configured to support a body from a structure, and at least one motor. A magnetorheological (MR) fluid clutch apparatus(es) is coupled to the at least one motor to receive torque from the motor, the MR fluid clutch apparatus controllable to transmit a variable amount of torque. A mechanism is between the at least one MR fluid clutch apparatus and the body to convert the torque received from the at least one MR fluid clutch apparatus into a force on the body. Sensor(s) provide information indicative of a state of the body or structure. A controller receives the information indicative of the state of the body or structure and for outputting a signal to control the at least one MR fluid clutch apparatus in exerting a desired force on the body to control movement of the body according to a desired movement behavior.

The invention relates to a vehicle cab or a vehicle seat comprising an upper part and a lower part which are vertically spring-mounted relative to one another by means of at least one height-adjustable scissor-action frame comprising two scissor arms which are pivotable about a common axis, and at least one air spring having a variable air volume, it being possible for movements of the scissor-action frame to be transmitted to a switching element, by means of a transmission element that is mechanically operatively connected to the scissor-action frame, in order to control the air volume of the air spring, wherein a height-adjustment device for the scissor-action frame, comprising a manually actuable control lever element and a guide element that is mechanically operatively connected thereto, the switching element being able to be pivoted about a first axis of rotation and the transmission element being able to be pivoted about the first axis of rotation in the opposite direction to the switching element by means of the guide element, in order to change a neutral position of the switching element that is between two switches provided for controlling an air volume of the air spring.

A vehicle seat control system (1) includes a first backrest portion (302) rotatably connected to a seating portion (301) by a first connection unit (308), a second backrest portion (302) rotatably connected to the first backrest portion by a second connection unit (309), a folding adjustment unit (304) that adjusts an angle of the second connection unit, a seat surface adjustment unit (304) that adjusts a height of the seating portion, a first angle detection unit (308a) that detects a first angle that is formed between the first backrest portion and a floor surface, a second angle detection unit (309a) that detects a second angle that is formed between the second backrest portion and the first backrest portion, and a control unit (160) that controls the folding adjustment unit on the basis of the first angle at the time of automatic driving of the vehicle to adjust the second angle, and controls the seat surface adjustment unit to maintain a height of a reference position in the second backrest portion to be equal to or greater than a reference height in a case that the height of the reference position in the second backrest portion is smaller than the reference height.

An electromotive ancillary unit of a motor vehicle, particularly a seat adjustment, having a mounting plate and an adjustment drive having an electric motor and a gearing mechanism. The gearing mechanism is disposed within a gearbox closed by means of a cover through which an output shaft connected to the gearing mechanism protrudes. The gearbox is mounted on the mounting plate, and the cover abuts to the mounting plate via a damping element in the axial direction of the output shaft. The invention further relates to a seat of a motor vehicle having a seat adjustment.

A pressure reducer, comprising an outer cylinder with a first air supply connector on a first end side of the outer cylinder and a second air supply connector on a second end side of the outer cylinder is provided. A piston can be guided movably in the outer cylinder. A first air chamber is arranged between the first air supply connector of the outer cylinder and the first front surface of the piston, and a second air chamber is arranged between the second air supply connector of the outer cylinder and a second front surface of the piston. The surface areas of the two front surfaces of the piston are of different size. The pressure reducer is suitable for reducing a second air pressure which prevails in the second air chamber in a pulsed manner proportionally to a first air pressure which prevails in the first air chamber, by a first air connection.

The invention relates to a vehicle cab or a vehicle seat comprising an upper part and a lower part which are vertically spring-mounted relative to one another by means of at least one height-adjustable scissor-action frame comprising two scissor arms which are pivotable about a common axis, and at least one air spring having a variable air volume, it being possible for movements of the scissor-action frame to be transmitted to a switching element, by means of a transmission element that is mechanically operatively connected to the scissor-action frame, in order to control the air volume of the air spring, wherein a height-adjustment device for the scissor-action frame, comprising a manually actuable control lever element and a guide element that is mechanically operatively connected thereto, the switching element being able to be pivoted about a first axis of rotation and the transmission element being able to be pivoted about the first axis of rotation in the opposite direction to the switching element by means of the guide element, in order to change a neutral position of the switching element that is between two switches provided for controlling an air volume of the air spring.