Self-penetrating screw

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

C411S424000

Reexamination Certificate

active

07950888

ABSTRACT:
A screw includes a shaft, a trumpet-shaped head provided to a base end of the shaft, and a narrow-tip portion formed at a tip end of the shaft. The shaft has different diameters at a small-diameter portion contiguous to the narrow-tip portion and at a large-diameter portion contiguous to the head. Two screw threads are formed on the small-diameter portion and one screw thread is formed on the large-diameter portion. Therefore, a thread portion can be divided into a double-thread portion and a single-thread portion. It is preferable that the screw threads forming the double-thread portion have different heights. The screw is mainly used for fastening a plasterboard to a frame member.

REFERENCES:
patent: 3233500 (1966-02-01), Devellier
patent: 3524378 (1970-08-01), Wieber
patent: 3703843 (1972-11-01), Laverty
patent: 4329099 (1982-05-01), Shimizu et al.
patent: 5190426 (1993-03-01), Wieder et al.
patent: 5259398 (1993-11-01), Vrespa
patent: 5863167 (1999-01-01), Kaneko
patent: 6086303 (2000-07-01), Fluckiger
patent: 2363111 (2000-02-01), None
patent: 60-23614 (1985-02-01), None
patent: 9-60626 (1997-03-01), None
patent: 9-273526 (1997-10-01), None
patent: 10-246214 (1998-09-01), None
patent: 11-006509 (1999-01-01), None
patent: 2000-266020 (2000-09-01), None
patent: 2001-200822 (2001-07-01), None

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