Actuating drive with a wrap spring arrangement

Details Actuating drive with a wrap spring arrangement Actuating drive with a wrap spring arrangement

2007-03-20

2007-03-20

Bonck, Rodney H. (Department: 3681)

192 clutches and power-stop control

Transmission and brake

Torque-responsive brake

Reexamination Certificate

active

10998371

ABSTRACT:
An actuating drive for transmitting drive torque to a power takeoff, comprising a drive unit; a braking device comprising a cylindrical surface; and a wrap spring having a plurality of turns which are concentric to the cylindrical surface, a pair of ends, a first actuating area on one of the ends, and a second actuating area on one of the ends. When the drive unit exerts a drive torque in a first direction, the first actuating area is nonrotatably connected to the drive unit, the turns undergo a diameter change away from the cylindrical surface, and the second actuating area is nonrotatably connected to the power takeoff for transmitting drive torque. When the drive torque is interrupted, the turns undergo a diameter change toward the cylindrical surface and frictionally engage the cylindrical surface to block transmission of restoring torque from the power takeoff to the drive unit.

REFERENCES:
patent: 1687243 (1928-10-01), Haskins
patent: 1965878 (1934-07-01), Briggs
patent: 2145666 (1939-01-01), Roethel
patent: 2598993 (1952-06-01), Gorske
patent: 3235248 (1966-02-01), Hans
patent: 3930566 (1976-01-01), Matsushima
patent: 4499787 (1985-02-01), Leistner et al.
patent: 4871033 (1989-10-01), Odoni et al.
“Schlingfedern: interessante mechanische Servoelemente”,Antriebstechnik,vol. 34, No. 11, 1995, p. 67.

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