Over-ride mechanism for screw drive actuator

Details Over-ride mechanism for screw drive actuator Over-ride mechanism for screw drive actuator

1976-03-24

1977-09-06

Scott, Samuel

192 clutches and power-stop control

Stop mechanism

Overload release

74 5915, 744245R, 64 28R, F16P 300

Patent

active

040462412

ABSTRACT:
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 conditions 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 outwardly 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.

REFERENCES:
patent: 1607628 (1926-11-01), Hume
patent: 2612051 (1952-09-01), Felt
patent: 3161240 (1944-12-01), Horowitz
patent: 3260334 (1966-07-01), Johnson
patent: 3487902 (1970-01-01), Persson et al.
patent: 3968705 (1976-07-01), Amano et al.

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