Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1979-03-30
1981-02-17
Staab, Lawrence J.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
744248R, F16H 118
Patent
active
042507626
ABSTRACT:
A linear actuator includes a nut threaded onto a rotatable drive screw and adapted to be coupled to and uncoupled from an axially movable driven member by a selectively engageable and disengageable helical spring clutch and a friction clutch connected in series with the spring clutch. When the spring clutch is disengaged, the nut is permitted to rotate with the screw and thus the driven member remains stationary. When the spring clutch is engaged, it acts through the friction clutch to couple the nut to the driven member and prevent rotation of the nut so that the driven member advances along the screw. When the driven member reaches a limit position, a positive stop automatically releases the friction clutch to interrupt the drive to the driven member even though the spring clutch remains engaged.
REFERENCES:
patent: 2649300 (1953-08-01), Launder
patent: 2860521 (1958-11-01), Sierant
patent: 2893258 (1959-07-01), Meyer
patent: 3087587 (1963-04-01), Flieg
patent: 3157058 (1964-11-01), Haller
patent: 3393779 (1968-07-01), Sacchini
patent: 3648810 (1972-03-01), Weatherby
Staab Lawrence J.
Warner Electric Brake & Clutch Company
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