US PATENT SUBCLASS 411 / 89
.~ Member extending between plural fasteners and restricting the rotation thereof in one direction more than the other (e.g., pawl and ratchet)

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

81  DF  THREADED FASTENER LOCKED TO A DISCREET STRUCTURE (E.G., PLATE, RAIL, WHEEL) {13}
89.~ Member extending between plural fasteners and restricting the rotation thereof in one direction more than the other (e.g., pawl and ratchet)

DEFINITION

Classification: 411/89

Member extending between plural fasteners and restricting the rotation thereof in one direction more than the other (e.g., pawl and ratchet):

(under subclass 81) Device wherein the other element, or at least one of a plurality thereof, comprises a member which extends between two or more bolts or nuts and engages them in such a manner that rotation of the bolt or nut in one direction (e.g., unthreading) can be accomplished only by either the application of an excessive force or the disengagement of the member, or a portion thereof, from the bolt or nut, whereas rotation in the opposite direction e.g., threading) requires little, if any, more force than would be the case if the member was not there.

(1) Note. Exemplary of the types of member-to-bolt-or-nut engagement are: (a) the member may engage merely a corner of a flat-sided bolt head or nut; (b) the bolt, bolt head or nut may be formed with one or more radial projections for engagement by the member; (c) the bolt head or the nut may be formed with an axial extension which carries one or more member-engaging projections; or (d) there may be present an additional element which is coupled against rotation to the bolt or nut and which includes one or more member-engaging projections.

(2) Note. The member-engaging projections of (d) of (1) Note may be in the nature of a ratchet, in which event the member functions as a pawl.