Self adjusting, high strength, screw system

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure

Reexamination Certificate

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Details

C411S016000, C411S438000

Reexamination Certificate

active

06860691

ABSTRACT:
A faster system includes a screw or bolt having two interleaved helical threads, which bracket a helicoil. The helicoil expands and torques by various means to maintain hold and purchase between the screw coil combination and the substrate into which the screw and helicoil are inserted even when the substrate recedes a significant distance from the screw and helicoil combination. The fastener system includes means for latching the tilt of the coil so as to minimize the constraining forces and optimize the motion of the helicoil, that results in the screw or bolt being pushed into the substrate.

REFERENCES:
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patent: 1468074 (1923-09-01), Peirce
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patent: 5536126 (1996-07-01), Gross
patent: 5961266 (1999-10-01), Tseng
patent: 6276883 (2001-08-01), Unsworth et al.
patent: 6461092 (2002-10-01), Tseng
patent: 6494657 (2002-12-01), Unsworth et al.
patent: 20010053317 (2001-12-01), Unsworth et al.
patent: WO 9318312 (1993-09-01), None
patent: WO 0198672 (2001-12-01), None

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