Abstract: An actuator includes an inner tube, an outer tube disposed over the inner tube in a manner such that the tubes reciprocate with respect to one another. A removably operably disposed ball screw having a ball nut thereon extends through the tubes, the ball screw having an outer diameter which is less than an inner diameter of the tubes such that an annular space exists between the screw and the tubes. A brake assembly is operably disposed within outer tube and at least a part of said brake assembly, and said ball screw and said ball nut are removable from the tubes without causing damage thereto.

Abstract: Power transmission and actuator apparatus especially advantageous in application to outdoor antennas, particularly TVRO parabolic antennas, to be operated by remote control, comprises a tub-shaped receptacle including a base having a peripherally encompassing relatively projected wall structure defining therewith a cavity, the major extent of the opening to the cavity being bridged by a releasably attached plate mounting a terminal strip adapted for connection thereto of a remote source of electrical energy, the base mounting a first integrated adapter for mounting a drive motor and a second for mounting an actuator assembly in a manner to provide for an inherent evacuation of water from each thereof during its use. The plate commonly mounts a perpendicularly related shaft and a multiplicity of control elements and the shaft has thereon a slip fit output gear in mesh with further gear means intermediate said plate and the base of the receptacle.