US PATENT SUBCLASS 411 / 271
.~.~ Externally threaded element includes an axially extending opening in its free end for receiving an expander member

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}
259  DF  .~ Comprising a thread lock {18}
271.~.~ Externally threaded element includes an axially extending opening in its free end for receiving an expander member

DEFINITION

Classification: 411/271

Externally threaded element includes an axially extending opening in its free end for receiving an expander member:

(under subclass 259) Device wherein the externally threaded element includes, in that end which is opposite its headed end, a longitudinal bore, cavity, slot, etc., into which a distinct member of nonuniform thickness (e.g., a cone, a wedge, etc.) is moved for forcing a portion of the thread of that element generally radially outwardly against a corresponding portion of the thread of the internally threaded element.

(1) Note. While the distinct member ordinarily is a component of the bolt and nut assembly, in rare cases it is a spreader tool (e.g., a chisel) which is associated with the assembly only momentarily.

(2) Note. While the distinct member frequently is driven into the externally threaded element by axially directed blows, it is sometimes pulled or pushed thereinto by the turning of the elements into threaded interengagement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

325, for a structurally similar opening and member, but wherein the expansion of the externally threaded element does not take place in the region of its threaded interengagement with the other element.