Rotational actuator

Details Rotational actuator Rotational actuator

1996-07-25

1998-08-04

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81467, 81 52, 81 5739, 81465, B25B 1300, B25B 2100

Patent

active

057877700

ABSTRACT:
A rotational actuator includes an actuator case, a first rotor supported on the actuator case for rotation about an axis of rotation, a second rotor supported on the actuator case coaxially with the first rotor and for rotation independent of the first rotor, an expandable member having one end secured to the second rotor and the other end secured to the first rotor for relatively rotating the first and second rotors by expansion or contraction thereof, and an expandable member controller for controlling the extent of expansion and contraction of the expandable member. The momentum of the first rotor in the rotational direction thereof when the expandable member is expanded or contracted is set to be higher than the momentum of the second rotor in the rotational direction thereof at this time.

REFERENCES:
patent: 2263709 (1941-11-01), Sittert
patent: 2600327 (1952-06-01), Ridge
patent: 3494592 (1970-02-01), Meschonat et al.
patent: 4418768 (1983-12-01), Swenson
patent: 4585078 (1986-04-01), Alexandrov et al.
patent: 4813312 (1989-03-01), Wilhelm
patent: 5076120 (1991-12-01), Lin
patent: 5509330 (1996-04-01), Nick
IBM Technical Disclosure Bulletin, vol. 30, No. 8, Jan. 1988, "Piezoelectric Rotator and Micropositioner", pp. 56-57.

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