The present invention provides a seat adjustment device for an aircraft or spacecraft, comprising: a seat rail for connection to a floor; and a seat connection for connection to at least one seat; and a worm is provided which can be actuated to adjust the seat connection relative to the seat rail.

A motor vehicle seat with a seat inclination adjustment device, with a first base element, a first seat frame element and a first actuator element, the actuator element has a lower link arm connected to the base element and arranged movably relative to the base element, an upper link arm connected to the lower link arm and movably arranged relative to the lower link arm, the upper link arm is connected to the seat frame element and is movably arranged, and a linear actuator with first and second linear actuator elements, the first linear actuator element is movably connected to the second linear actuator element and the first linear actuator element is movably connected to the base element and the second linear actuator element is movably connected to one of the link arms.

A single-stage gear reduction output mechanism for an automotive seat assembly including a gear housing bracket, gear housing, axle shaft, eccentric, and first and second gears. The axle shaft extends through the eccentric with a slip fit, the first gear rotates with the axle shaft, and the second gear is carried on a first bearing surface of the eccentric and meshingly engages the first gear in a planetary arrangement. A locking plate including first, second, and third slot cutouts is disposed within the gear housing. A support pin extends from the gear housing through the first slot cutout and a second bearing surface of the eccentric extends through the second slot cutout to support the locking plate and limit its movement along a lateral axis. The second gear includes a first pin that extends through the third slot cutout to prevent the first gear from back-driving the second gear.

A single-stage gear reduction output mechanism for an automotive seat assembly including a gear housing bracket, gear housing, axle shaft, eccentric, and first and second gears. The axle shaft extends through the eccentric with a slip fit, the first gear rotates with the axle shaft, and the second gear is carried on a first bearing surface of the eccentric and meshingly engages the first gear in a planetary arrangement. A locking plate including first, second, and third slot cutouts is disposed within the gear housing. A support pin extends from the gear housing through the first slot cutout and a second bearing surface of the eccentric extends through the second slot cutout to support the locking plate and limit its movement along a lateral axis. The second gear includes a first pin that extends through the third slot cutout to prevent the first gear from back-driving the second gear.

A seat adjustment device may have a first lead screw, a second lead screw, and a connector. A first portion of the connector may comprise threads that may be adapted to receive threads from the first lead screw. A second portion of the connector may comprise threads that are adapted to receive threads from the second lead screw.