Screw anchor

Details Screw anchor Screw anchor

1990-05-07

1991-01-22

Wilson, Neill R.

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

Having separate expander means

Bulged by axially contracting ends

411 55, 411427, F16B 1304

Patent

active

049867105

ABSTRACT:
A screw anchor formed from a stamped blank. The nut has inner, outer and intermediate layers which are folded prior to rolling the nut into its final form. The inner and outer layers have a common edge and the inner layer tapers inwardly from the ends of the common edge. The formed nut exhibits tremendous strength.

REFERENCES:
patent: 2559281 (1951-07-01), Croessant
patent: 2762252 (1956-09-01), Karitzky
patent: 3497890 (1970-03-01), Coyle
patent: 4269106 (1981-05-01), Leibhard et al.
patent: 4657456 (1987-04-01), Anquetin

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