A seat component adjustment actuator (1) comprises a housing, an electric motor (5), and a gearing (10) coupled to the electric motor (5) and comprising at least three worm transmission stages (11-16). A first worm transmission stage (11, 12) comprises a first worm (11) and a first worm gear (12) engaged with the first worm (11). A third worm transmission stage (15, 16) comprises a third worm (15) and a third worm gear (16) engaged with the third worm (15). The first worm (11) is supported in the housing such that the first worm (11) is rotatable about an input rotation axis. The third worm gear (16) is supported in the housing such that the third worm gear (16) is rotatable about an output rotation axis which is transverse to the input rotation axis.

A seat component adjustment actuator (1) comprises a housing, an electric motor (5), and a gearing (10) coupled to the electric motor (5) and comprising at least three worm transmission stages (11-16). A first worm transmission stage (11, 12) comprises a first worm (11) and a first worm gear (12) engaged with the first worm (11). A third worm transmission stage (15, 16) comprises a third worm (15) and a third worm gear (16) engaged with the third worm (15). The first worm (11) is supported in the housing such that the first worm (11) is rotatable about an input rotation axis. The third worm gear (16) is supported in the housing such that the third worm gear (16) is rotatable about an output rotation axis which is transverse to the input rotation axis.

Clutch-based adjustment mechanism for motorized multi-way seat adjustment An adjustment mechanism comprises multiplescrew shafts (111, 112, 113) and a motor (150) for driving the screw shafts. Further, the adjustment mechanism comprises a clutch mechanism (160) for selectively engaging the motor (150) with one or more of the screw shafts (111, 112, 113). A rotation of one or more of the screw shafts (111, 12, 113) caused by the motor (150) translates into adjustment of the seat according to a first degree of freedom. A rotation of one or more others of the screw shafts (111, 12, 113) caused by the motor (150) translates into adjustment of the seat according to a second degree of freedom.

A vehicle seat includes a seat cushion, a seatback, and a headrest. At least one of the seat cushion, the seatback, and the headrest includes a fixed part and a movable part. The fixed part and the movable part that is mounted so as to be movable relative to the fixed part are provided adjacent to each other. A border between the movable part and the fixed part is exposed to an outside of the seat. A movable-side edge of the movable part and a fixed-side edge of the fixed part are disposed adjacent to each other along a direction of movement of the movable part so as to form at least a part of the border exposed to the outside of the seat. The movable part moves relative to the fixed part while keeping a constant clearance between the movable-side edge and the fixed-side edge.

A vehicle seat includes a seat cushion, a seatback, and a headrest. At least one of the seat cushion, the seatback, and the headrest includes a fixed part and a movable part. The fixed part and the movable part that is mounted so as to be movable relative to the fixed part are provided adjacent to each other. A border between the movable part and the fixed part is exposed to an outside of the seat. A movable-side edge of the movable part and a fixed-side edge of the fixed part are disposed adjacent to each other along a direction of movement of the movable part so as to form at least a part of the border exposed to the outside of the seat. The movable part moves relative to the fixed part while keeping a constant clearance between the movable-side edge and the fixed-side edge.

The invention relates to a motor-vehicle accessory, comprising a moveable first part and a vehicle-fixed second part, wherein the first part is guided on the second part by a guide (43), wherein the guide (43) comprises at least one rack (22a, 22b, 24a, 24b) in engagement with a gear (21a, 21b, 23a, 23b), wherein the rack (22a, 22b, 24a, 24b) is on one of the parts, and the gear (21a, 21b, 23a, 23b) is on the other part.

The particular feature consists in that the guide additionally comprises a tolerance compensation that comprises at least one running rail (26a, 26b, 28a, 28b) on one of the parts and engages a running wheel (25a, 25b, 27a, 27b) on the other one of the parts, wherein the running wheel (25a, 25b, 27a, 27b) and/or the running rail (26a, 26b, 28a, 28b) is elastically deformable, and a press-fit is formed between the running rail and the running wheel, so that the meshing teeth of the first part and of the second part are urged into a defined position.

The invention relates to a motor-vehicle accessory, comprising a moveable first part and a vehicle-fixed second part, wherein the first part is guided on the second part by a guide (43), wherein the guide (43) comprises at least one rack (22a, 22b, 24a, 24b) in engagement with a gear (21a, 21b, 23a, 23b), wherein the rack (22a, 22b, 24a, 24b) is on one of the parts, and the gear (21a, 21b, 23a, 23b) is on the other part.

The particular feature consists in that the guide additionally comprises a tolerance compensation that comprises at least one running rail (26a, 26b, 28a, 28b) on one of the parts and engages a running wheel (25a, 25b, 27a, 27b) on the other one of the parts, wherein the running wheel (25a, 25b, 27a, 27b) and/or the running rail (26a, 26b, 28a, 28b) is elastically deformable, and a press-fit is formed between the running rail and the running wheel, so that the meshing teeth of the first part and of the second part are urged into a defined position.

A linkage extension system and method for holding an extendable portion of a seat in a desired position while the extendable portion translates from a retracted to an extended position and any intermediate position. A coupled damper produces a holding force to counter gravity or other forces which cause the translation of the seat extension away from a desired position. The linkage extension system is self-powered and operates within the enclosed portion of the seat.

A linkage extension system and method for holding an extendable portion of a seat in a desired position while the extendable portion translates from a retracted to an extended position and any intermediate position. A coupled damper produces a holding force to counter gravity or other forces which cause the translation of the seat extension away from a desired position. The linkage extension system is self-powered and operates within the enclosed portion of the seat.

A linkage extension system and method for holding an extendable portion of a seat in a desired position while the extendable portion translates from a retracted to an extended position and any intermediate position. A coupled damper produces a holding force to counter gravity or other forces which cause the translation of the seat extension away from a desired position. The linkage extension system is self-powered and operates within the enclosed portion of the seat.