Securing devices

Details Securing devices Securing devices

1993-06-15

1994-05-17

Wilson, Neill R.

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

Having separate expander means

Helical anchor

411324, 411424, 411438, F16B 1304, F16B 3504

Patent

active

053122143

ABSTRACT:
A spiral member for improving the grip of screws in wooden or other receptive substrates is disclosed. The spiral member has a central axial drive pin by which it can be driven into a thread in the receptive substrate, and it has an improved cross section providing wings or protuberances extending out past the side surfaces of the cross section. The spiral member also has an outwardly facing triangular apex which bites into the old thread while the wings bear upon the flanks of the screw thread of the screw that inserted into the spiral member, thereby improving the grip.

REFERENCES:
patent: 730585 (1903-06-01), Thiollier
patent: 1966520 (1934-07-01), Rayner
patent: 3515027 (1970-06-01), Textrom
patent: 4040326 (1977-08-01), Breed

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