US PATENT SUBCLASS 411 / 28
.~.~.~ Groove and follower

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

15  DF  HAVING SEPARATE EXPANDER MEANS {13}
24  DF  .~ Oppositely acting double wedge expander means {3}
27  DF  .~.~ Having rotation preventing means {1}
28.~.~.~ Groove and follower

DEFINITION

Classification: 411/28

Groove and follower:

(under subclass 27) Subject matter wherein a tapered element and the remainder of the holding device or the anchor are each provided with either a groove means or a protuberance means which cooperate to prevent those members from turning relative to each other when the tapered elements move toward or away from each other.