Cable drum latching and unlatching mechanism
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United States of America Patent
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Sep 15, 1987
Grant Date -
N/A
app pub date -
May 19, 1986
filing date -
May 19, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cable winding drum is provided with a ring gear having internal gear teeth and external ratchet teeth, and the drum and gear are supported in a housing for rotation in opposite directions about a drum axis to achieve winding and unwinding of a cable relative to the drum. The drum is rotated in opposite directions by an operating mechanism including a crank actuated crank and pinion assembly, a pawl and a pawl actuating lever. The pinion is supported by the housing and engages the internal gear teeth and, during rotation of the crank in the winding direction, the pinion rotates the drum and the pawl engages the ratchet teeth to preclude rotation of the drum in the unwinding direction. Upon rotation of the crank in the unwinding direction during engagement of the pawl with the ratchet teeth, the cam displaces the pawl actuating lever to release the pawl from engagement with the ratchet teeth to release the drum for rotation in the unwinding direction. Upon subsequent rotation of the crank in the drum winding direction the cam displaces the actuating lever to re-engage the pawl with the ratchet teeth and thus preclude rotation of the drum in the unwinding direction during rotation thereof by the crank in the winding direction.
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