Fastener having recessed, non-circular head, and...

B - Operations – Transporting – 25 – B

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B25B 21/00 (2006.01) B25B 23/00 (2006.01) B25B 23/08 (2006.01) B25B 23/10 (2006.01) F16B 23/00 (2006.01) E04D 15/04 (2006.01) F16B 5/01 (2006.01) F16B 25/10 (2006.01)

Patent

CA 2051728

An improved fastener having a non-circular head with a concave recess providing a datum useful in centering the head relative to a non-circular socket of a driving member. The recess may have a frusto-conical wall defining an upper, circular edge or substantially triangular walls defining an upper, non-circular edge. An improved tool useful to drive the improved fastener. In the improved tool, a driving member has a tubular extension with a non-circular socket, and a centering pin is movable axially toward an extended position, in which a convex end of the centering pin fits into the concave recess when the socket is fitted axially over the fastener head. The centering pin is biased toward the extended position.

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