Eccentric differential screw actuating, torque multiplying and s

Details Eccentric differential screw actuating, torque multiplying and s Eccentric differential screw actuating, torque multiplying and s

1987-02-26

1988-02-09

Staab, Lawrence

Machine element or mechanism

Mechanical movements

Reciprocating or oscillating to or from alternating rotary

744248R, F16H 2520

Patent

active

047234539

ABSTRACT:
An eccentric differential screw usable for torque multiplying, speed changing, positioning and actuating functions is disclosed. The disclosed device produces output between fixed output member positions.
A rotatable shaft having threaded portions, constrained axially, acting as a screw, is threadably engaged by fine threads to a floating nut-screw acting as a nut. The same floating nut-screw acting as a screw axially eccentric with respect to the axis of the said fine threads is threadably engaged by coarse threads to a rotatable nut. The unique motions of the parts and the self-locking behavior of the device being made achievable by the eccentricity of the axes of the said fine and coarse threads. The speed ratio of the device is dependent on the ratio of the leads of the fine and coarse threads.

REFERENCES:
patent: 2590745 (1952-03-01), Wuensch
patent: 2743618 (1956-05-01), Watson et al.
patent: 3007358 (1961-11-01), Vogel et al.
patent: 3183792 (1965-05-01), Allen
patent: 3184214 (1965-05-01), King
patent: 3248132 (1966-04-01), Pierce
patent: 3329069 (1967-07-01), Feroy
patent: 3583248 (1971-06-01), Langenberg
patent: 3731546 (1973-05-01), MacDonald
patent: 4266437 (1981-05-01), Obergfell

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