Expansion fastener

Details Expansion fastener Expansion fastener

1982-02-16

1984-10-02

Holko, Thomas J.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having separate expander means

Helical anchor

411 51, 411 60, F16B 1304

Patent

active

044745150

ABSTRACT:
The utility of an expansion fastener including an externally threaded shaft having a head shaped so as to be capable of being engaged by a manipulative tool, a generally cylindrical longitudinally split sleeve located around the shaft, a nut threaded on the shaft, the sleeve and the nut including coacting surfaces capable of expanding the sleeve as the nut is moved on the shaft can be improved by utilizing coacting structures on the end of the sleeve remote from the head and on the nut for preventing relative rotation between the sleeve and the nut as the shaft is turned. Preferably the sleeve is twisted slightly in a spiral-like manner so that an end of the sleeve serves as one of the coacting structures which engages an adjacent ridged or other not smooth surface of the nut serving as the other coacting structure. An edge or an irregular surface of both at the other end of the sleeve can effectively be utilized to hold the sleeve against rotation relative to a panel or similar member as the shaft is turned relative to the nut.

REFERENCES:
patent: 2955504 (1960-10-01), Lovrinch
patent: 2959999 (1960-11-01), Wing
patent: 3373648 (1968-03-01), Pitzer
patent: 3855896 (1974-12-01), Kaufman

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