Bi-directional clutch

Details Bi-directional clutch Bi-directional clutch

1981-03-18

1983-02-08

Krizmanich, George H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 12BA, 192 33C, 192 41S, 192 43, F16D 6700, B60T 712

Patent

active

043724329

ABSTRACT:
There is disclosed a bi-directional clutch, particularly useful in window shade applications. The bi-directional clutch includes a first or core member and an unwrap spring, that is, a spring having an inside diameter somewhat smaller than the diameter of the core, the spring being wound around the core. The unwrap spring has a number of helical turns and spring tangs which extend outwardly past the circumference of the spring and generally perpendicular to the axis of the spring. The spring is controlled by a second, control or driving member which, when rotated, applies force to one or the other of the spring tangs to unwrap or loosen the spring, thereby allowing the spring to rotate relative to the core. As the spring rotates, one of the spring tangs abuts a third or driven member. The third or driven member is rotated by the spring, allowing the third member to rotate relative to the first or core member. The third or driven member continues to rotate, relative to the first or core member, until the second, control or driving member stops rotating. However, when the driven member is rotated directly, the spring is locked onto the core member and further rotation of the driven member is prevented.

REFERENCES:
patent: Re16565 (1927-03-01), Myers
patent: 823971 (1906-06-01), Remondy
patent: 2145666 (1939-01-01), Roethel
patent: 3135369 (1964-06-01), Nisenson et al.
patent: 3307663 (1967-03-01), Luenberger
patent: 3340975 (1967-09-01), Erickson
patent: 3477486 (1969-11-01), Modrey
patent: 3915268 (1975-10-01), MacDonald

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