Preload release mechanism

摘要

A preload release mechanism comprising a preload spring assembly (26) adapted to apply a preload to a first connector member (16) which is mounted on a support structure (14) and adapted for connection with a second connector member on an object (10). The assembly (26) comprises telescoped bushings (28,29) and a preload spring (25). A tubular shaft (41) extends through the spring assembly (26) and openings in the first connector member and support structure (14), on which it is clamped. A plunger rod (51) in the shaft (41) is provided with a tip end (52) and a recess in the rod near the other end thereof. A retainer (55) precludes passage of the rod (51) through the shaft in one direction and an end cap (62) closes the bore of the shaft at the other end and provides a shoulder which extends radially of the shaft. A plunger return spring (61) biases the plunger rod against the plunger retainer with the plunger tip protruding from the shaft and a spring assembly return spring (63) engages at its ends the shoulder (62a) of the end cap and one end of the spring assembly (26). Detents (70) received in lateral openings in the tubular shaft (41) are held captive by the plunger rod and one end of the spring assembly (26) to lock the spring assembly (26) on the tubular shaft and apply a preload to the first connector member. Upon completion of the connection, detents (71) and spring assembly (26) are released by plunger contact with the object to be connected, thereby releasing the preload while the connection is maintained.