US PATENT SUBCLASS 254 / 376
.~.~.~ Ratchet wheel or formation and locking pawl

Current as of: June, 1999
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254 /   HD   IMPLEMENTS OR APPARATUS FOR APPLYING PUSHING OR PULLING FORCE

264  DF  APPARATUS FOR HAULING OR HOISTING LOAD, INCLUDING DRIVEN DEVICE WHICH CONTACTS AND PULLS ON CABLE {4}
266  DF  .~ Device includes rotatably driven, cable contacting drum {34}
375  DF  .~.~ Including means for preventing or retarding rotation of drum in at least one direction {3}
376.~.~.~ Ratchet wheel or formation and locking pawl

DEFINITION

Classification: 254/376

Ratchet wheel or formation and locking pawl:

(under subclass 375) Apparatus wherein the means consist of either (a) a wheel having teeth located on its perimeter, the wheel being rotatably interconnected to the drum, and a pawl which interlocks with the teeth in one direction of the wheel's rotation to prevent movement of the drum and which disengages from the teeth in the other direction of the wheel's rotation to allow movement of the drum, or (b) a stationary ratchet formation having teeth located on its perimeter and a pawl connected to the drum which revolves around an axis when the drum is rotated, the pawl interlocks with the teeth in one direction of its travel to prevent movement of the drum and disengages from the teeth in the other direction of its travel to allow movement of the drum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

223, for implements or apparatus for tensioning flexible material or for extracting stumps or poles including a rotatably driven drum provided with a ratchet wheel and locking pawl for preventing rotation of the drum in one direction.

306, 320, 352, and 369, for a drum having a drive train which includes a ratchet wheel and a pawl interengaging therewith, and which may also include an additional pawl for preventing movement of the drum in one direction.