Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1999-08-09
2000-05-23
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
4113871, 411418, F16B 2500, F16B 3504
Patent
active
06065919&
ABSTRACT:
A self-tapping screw with improved cutting point includes a head, a screw body, a double cutting point, and a washer. A first thread and a second thread are formed on the screw body. The second thread has the same pitch as the first thread and is formed between the first thread. The second thread has a major diameter which is less than the major diameter of the first thread. The first thread starts at substantially a shoulder and continues to a point of the screw body The second thread starts at substantially the shoulder and continues to the point of the screw body. The shoulder is formed on a bottom of the head. A washer preferably metal with rubber vulcanized thereon is placed under the shoulder of the head. The rubber seals the hole created by the self-tapping screw with improved cutting point. A notch may be included to improve the deburring and drilling ability thereof. The major diameter of the second thread may be increased to equal the major diameter of the first thread near the head to facilitate the automated application of the washer.
REFERENCES:
patent: 3541918 (1970-11-01), Johnson
patent: 4329099 (1982-05-01), Shimizu et al.
patent: 5294227 (1994-03-01), Forster et al.
patent: 5779417 (1998-07-01), Barth et al.
patent: 6015252 (2000-01-01), Peck
Ersler Donald J.
Wilson Neill
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