초록 ▼

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 opp

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.

대표청구항 ▼

A cable winding and unwinding mechanism comprising cable drum means having a drum axis, a cable having one end connected to said drum means and having a free end, support means supporting said drum means for rotation in opposite directions about said drum axis, drum drive means rotatable in opposite

A cable winding and unwinding mechanism comprising cable drum means having a drum axis, a cable having one end connected to said drum means and having a free end, support means supporting said drum means for rotation in opposite directions about said drum axis, drum drive means rotatable in opposite directions about a fixed drive axis, one of said opposite directions of each said drum means and said drive means being a cable winding direction and the other a cable unwinding direction, drum holding means displaceable between holding and release positions respectively holding said drum means against rotation in said unwinding direction and releasing said drum means for rotation in said unwinding direction, and actuator means separate from said drive means and said holding means and mounted on said support means for displacement between first and second positions respectively corresponding to said holding and release positions, and said drive means including means to actuate said actuator means for displacement between said first and second positions respectively in response to rotation of said drive means in said winding and unwinding directions about said drive axis to alternately displace said holding means between said holding and release positions.