US PATENT SUBCLASS 411 / 326
.~ Pawl and ratchet

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

190  DF  HAVING STRUCTURE TO RESTRICT ROTATION OF THREADED, MATING PIECES (E.G., NUT LOCK) {13}
326.~ Pawl and ratchet {2}
327  DF  .~.~> Pawl carried by the internally threaded element {2}
330  DF  .~.~> Washer carried pawl {1}

DEFINITION

Classification: 411/326

Pawl and ratchet:

(under subclass 190) Device wherein the threaded elements are locked together by structure comprising a protuberance on one of the elements, or on an additional member, cooperating with a series of cam surfaces and stop shoulders on the other element, or on the member, whereby relative rotation of the elements is permitted in the tightening direction but prevented or restricted in the loosening direction.