Abstract: A ball screw and nut linear actuator has a motor and a ball nut and screw assembly in side by side disposition. Gearing connects with the motor shaft to drive the screw and a housing for the gearing and ball nut and screw assembly includes an elongate housing tube within which the screw assembly is housed. The nut incorporates an extension sleeve assembly for extending movement out of the housing tube which anchors the screw against axial movement while jounaling it for rotation. A pin and axial track connection between the extension sleeve assembly and the housing tube guides the extension sleeve assembly in axial movement and prevents relative rotation of the housing tube and sleeve assembly.

Abstract: A method and apparatus wherein a travel limit/dampening device is coupled to the end of a screw of a linear ball screw actuator device for limiting the travel of an actuator extension coupled to a nut supported for linear driven displacement in either direction along the screw. The travel limit/dampening device includes a gas shock supported within a double acting reaction device reactive axially between the nut and screw when the extension is fully retracted and extended, respectively, to collapse the shock absorber and thereby dampen the movement of the extension at each end of its stroke.