US PATENT SUBCLASS 188 / 71.9
.~.~.~.~ Including unidirectionally rotating screw

Current as of: June, 1999
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188 /   HD   BRAKES

*  DD  WHEEL {10}
71.1  DF  .~ Axially movable brake element or housing therefor {8}
71.7  DF  .~.~ With means to adjust for wear of brake {1}
71.8  DF  .~.~.~ Self-adjusting means {1}
71.9.~.~.~.~ Including unidirectionally rotating screw

DEFINITION

Classification: 188/71.9

(under subclass 71.8) Apparatus wherein the altering means includes a helically threaded member that is caused to turn relative to a mating member in one direction only, thus causing said threaded member to advance along its axis of turning.

(1) Note. Usually the screw rotates by reason of a ratchet fixed thereto that cooperates with a pawl oscillating relative to the screw.