US PATENT SUBCLASS 254 / 235
.~.~ Having ratchet wheel and pawl for driving screw

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}
231  DF  .~ Including screw drive {4}
235.~.~ Having ratchet wheel and pawl for driving screw

DEFINITION

Classification: 254/235

Having ratchet wheel and pawl for driving screw:

(under subclass 231) Implements or apparatus in which either the rod, rider or threaded element is rotated about its axis by a drive train which includes a rotatable wheel having teeth on its perimeter and a pawl which is reciprocated along a linear or angular path; the pawl engages the teeth and turns the wheel during movement in one of its directions and disengages from the teeth during its return movement.