Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Including integral locking means
Patent
1978-10-13
1981-07-28
Nelson, Peter A.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Including integral locking means
411122, G21C 1306
Patent
active
042808758
ABSTRACT:
Safety device for preventing unscrewing of cylinder head screws fastening two structural members together, one of the structural members having receiving bores formed therein, the screws having heads disposed in said receiving bores and being formed with inner polygonal cutouts, the screws extending through the one structural member and being anchored in the other structural member, includes circular grooves cut into the one structural member at the receiving bores, plastically deformable ring collars disposed in the circular grooves and spaced from the screw heads so as to form annular gaps therebetween, at least two arcuate recesses formed at equal distances from one another about the periphery of the screw heads, the ring collars having a first set of portions thereof pushable into the arcuate recesses in tightened condition of the screws.
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patent: 3750732 (1973-08-01), Moebius
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patent: 4077840 (1978-03-01), Aubert
patent: 4100021 (1978-07-01), Silverblatt
Kraftwerk Union Aktiengesellschaft
Lerner Herbert L.
Nelson Peter A.
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