Abstract: A linear actuator wherein a load-bearing body or structure made of relatively heavy metal provides for flexibly supporting an electric motor, the output shaft of which is connected, via a belt drive, to a tubular shaft parallel to the output shaft of the motor, and connected in rotary manner, at a first point, to the load-bearing structure and, at a second point, to a plastic element integral with the load-bearing structure; the output member of the actuator consisting of a screw coaxial with the tubular shaft and connected to the same via a recirculating-ball screw-nut-screw coupling.

Abstract: A recirculating ball screw-nut screw coupling wherein the nut screw is defined by a cylindrical body having an internal helical groove for a number of balls located between the screw and nut screw, and two substantially radial holes each larger in diameter than the helical groove and each engaged by a plug having a hole facing the aforementioned groove; both plugs being connected integral with the opposite ends of a U-shaped fastener fitted on to the outside of the nut screw and having an internal recirculating channel connecting the holes in the plugs to each other, as well as externally via a radial loading hole.

Abstract: A vehicle power seat, wherein the seat portion presents a carriage having a center cavity for a spring cushion, and hinged at the rear to a reclinable backrest. The carriage is mounted in axially-sliding manner on two substantially horizontal lateral guides located on opposite sides of the center cavity, and supported on a slide traveling along two fixed inclined lateral guides. Backrest rotation in relation to the carriage, axial slide of the carriage along the horizontal lateral guides, and slide travel along the inclined lateral guides, are each controlled by a pair of electric linear actuators on opposite sides of the carriage center cavity.

Abstract: An axial actuator wherein an output rod is controlled axially by a recirculating-ball screw-nut screw coupling, the screw of which is formed on the rod, and the nut screw of which is supported in rotary and axially-fixed manner on a support and rotated in relation to the same by a motor; the nut screw constituting the intermediate ring of a double thrust bearing mounted, via the interposition of a flexible support, between two opposite surfaces on the support.

Abstract: A control system for a vehicle power seat, which includes at least an electric actuator for powering at least one seat movement and a controller for operating the same. The system includes an electronic control system for detecting operation of the aforementioned controller and connecting the actuator to an electric power supply over wires which, when the actuator is idle, are cut off from the power supply.