US PATENT SUBCLASS 411 / 449
.~.~.~.~ Axially collapsible section

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

439  DF  IMPACT DRIVEN FASTENER, E.G., NAIL, SPIKE, TACK, ETC. {13}
446  DF  .~ Including integral locking means {3}
447  DF  .~.~ Comprising deformable portion {1}
448  DF  .~.~.~ Expansible on impact {1}
449.~.~.~.~ Axially collapsible section

DEFINITION

Classification: 411/449

Axially collapsible section:

(under subclass 448) Subject matter wherein the alterable portion is designed to collapse upon the application of a predetermined axial force thereby producing radial expansion of adjacent portions of the fastener.