Abstract: An apparatus is disclosed for the positive retention of a closure panel alternately in an open position or a closed position with respect to a compartment. The apparatus comprises push rod means, crank pin means for rotatively capturing an end of the push rod means, and resilient pocket means cupped in an adjacent inner wall of the compartment for receiving the distal end of the push rod means. The effect according to the invention is such that as the panel is alternately opened or closed, the intermittent rotary-to-reciprocal motion of the crank pin/push rod means causes the crank pin means to rotate past the dead center of the pivot means against the restorative force of the resilient pocket. The subsequent contraction of the pocket provides for positive retention of the closure panel in an open or closed position.

Abstract: An ultra-compact projection television receiver is disclosed comprising in combination cabinet means for enclosing the receiver components including a vertically reciprocable, rear projection viewing screen selectively storable in the cabinet. Precision elevating means provides for raising and lowering the screen between a stored position in the cabinet and a receiver-operable viewing wherein the screen is emerged. A television system has an ON control mode for providing television sound and pictures and an OFF control mode. Control means coupled to the elevating means and the television system provide for sensing the position of the screen in its reciprocation, and obstructions to said reciprocation manifested by increased resistance to said reciprocation, and correlatively controlling the elevating means and the OFF/ON control modes of the television system in response thereto.