US PATENT SUBCLASS 254 / 223
.~.~.~ Ratchet wheel or formation and pawl

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

199  DF  PORTABLE IMPLEMENTS OR APPARATUS FOR TENSIONING FLEXIBLE MATERIAL OR FOR EXTRACTING STUMPS OR POLES {12}
213  DF  .~ Including rotatably driven drum for engaging either material or force transmitting cable {9}
222  DF  .~.~ With means for preventing or retarding rotation in at least one direction {1}
223.~.~.~ Ratchet wheel or formation and pawl

DEFINITION

Classification: 254/223

Ratchet wheel or formation and pawl:

(under subclass 222) Implements or apparatus wherein the means consists 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:

217+, for a drum having 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.

357, and 376, for load-hauling or -hoisting apparatus including a rotatably driven drum provided with a ratchet wheel and locking pawl for preventing rotation of the drum in one direction.