Gear drive unit

Details Gear drive unit Gear drive unit

1991-07-23

1992-11-03

Herrmann, Allan D.

Machine element or mechanism

Gearing

Reversal of direction of power flow changes power...

74 8914, 192 41S, 192 4892, 454155, 454315, F16D 1308, F16D 4700, F24F 1315

Patent

active

051598540

ABSTRACT:
A gear drive unit of the type including a twin-shaft selective output mechanism is disclosed wherein first and second overrunning clutch mechanisms constituting the twin-shaft selective output mechanism are each composed of a spring-receiving chamber, a coiled spring and a driven gear. The first overrunning clutch mechanism, in response to rotation of a worm wheel in a forward direction, radially expands a first coiled spring to connect the worm wheel and a first driven gear, thereby connecting the worm wheel and a first driven gear to transmit the forward rotation of the worm wheel to the driven gear. Similarly, the second overrunning clutch mechanism is responsive to rotation of the worm wheel in the reverse direction to enlarge the diameter of a second coiled spring, thereby connecting the worm wheel and a second driven gear to transmit the reverse rotation of the worm wheel to the second driven gear. The twin-shaft selective output mechanism using such coiled springs is simple in construction and easy to manufacture.

REFERENCES:
patent: 2894403 (1959-07-01), Tomko
patent: 3035504 (1962-05-01), Cline et al.
patent: 4676146 (1987-06-01), Takahashi et al.
patent: 4986400 (1991-01-01), Heller

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