F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/71
F16H 25/12 (2006.01) F16H 25/22 (2006.01) F16P 3/00 (2006.01)
Patent
CA 1049290
OVER-RIDE MECHANISM FOR SCREW DRIVE ACTUATOR ABSTRACT OF THE DISCLOSURE A spring clip over-ride mechanism for screw drive actuators which convert rotary motion to linear motion. The screw drive actuator of the invention has a tubular rotatably driven member and a screw threaded rod axially located inside the tubular member. The tubular member has a plurality of apertures therein. The spring clip of the invention surrounds the tubular member and biases a ball occupying each aperture into engagement with the threads on the rod member such that under normal con- ditions the balls drivingly engage the threaded rod to convert the rotary motion of the tubular member into linear motion of the rod member. In the event the rod member jams, the spring clip overload mechanism of the invention allows the driving balls to move radially out- wardly so as to disengage themselves from the rod threads. Thus, the spring clip of the invention allows the screw drive actuator to be manually moved as well as provides a yieldable overload mechanism which allows the tubular member to continue to rotate even if the rod member is jammed.
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