Concrete fastener

Details Concrete fastener Concrete fastener

1992-03-02

1993-03-02

Lindsey, Rodney M.

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

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

411386, 411426, F16B 3504

Patent

active

051904268

ABSTRACT:
A fastener for securing fixtures to concrete or masonry. The fastener includes a dual-thread first stage for engaging a bore in the concrete and stabilizing and centering the fastener as it taps its way into the bore. A single-thread second stage has a pitch larger than the threads of the first stage for receiving particulate cut from the bore so that the particulate will not interfere with driving the fastener completely into the bore.

REFERENCES:
patent: Re28111 (1974-08-01), Laverty
patent: 3861269 (1975-01-01), Laverty
patent: 4034641 (1977-07-01), Williams, Jr. et al.
patent: 4439077 (1984-03-01), Godsted
patent: 5061136 (1991-10-01), Dixon et al.

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