Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1999-02-18
2000-01-18
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
4113872, 411412, 411418, F16B 2500, F16B 3504
Patent
active
060152524
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 is placed under the shoulder of the head. The rubber washer 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.
REFERENCES:
patent: 1084643 (1914-01-01), Lasater
patent: 1651796 (1927-12-01), Arenz
patent: 2169408 (1939-08-01), De Vellier
patent: 3056234 (1962-10-01), Nelsson et al.
patent: 4329099 (1982-05-01), Shimizu et al.
patent: 4621963 (1986-11-01), Reinwall
patent: 4834602 (1989-05-01), Takasaki
patent: 5061136 (1991-10-01), Dixon et al.
patent: 5294227 (1994-03-01), Forster et al.
Ersler Donald J.
Wilson Neill
LandOfFree
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