Screw with protruding sheets on head portion

Details Screw with protruding sheets on head portion Screw with protruding sheets on head portion

2005-05-03

2005-05-03

Miller, William L. (Department: 3677)

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

C411S387200, C411S411000, C411S424000

Reexamination Certificate

active

06887023

ABSTRACT:
A screw with protruding sheets on a head portion comprises a thread portion; a screw tail at one end of the thread portion, a slot formed on the screw tail; a plurality of screwing sheets formed at another end of the thread portion; a plurality of recesses formed between the plurality of screwing sheets for removing undesired pieces; a drilling head being formed at front ends of the screwing sheets; the drilling head formed with a plurality of protruding sheets made of soft metal. By screwing the screw by rotating from the slot, the screw will rotate so as to drill a hole and enter into a wood plate. Then the protruding sheets enlarge the hole. The undesired wood pieces are removed from the recesses. When the screw further drills into a metal plate, the protruding sheet will be worn out because the protruding sheet is made of soft metal.

REFERENCES:
patent: 3665801 (1972-05-01), Gutshall
patent: 3699841 (1972-10-01), Lanius, Jr.
patent: 4028987 (1977-06-01), Wilson
patent: 4538486 (1985-09-01), Lutrat
patent: 4645396 (1987-02-01), McCauley et al.
patent: 4874278 (1989-10-01), Kawashita
patent: 6739815 (2004-05-01), Takasaki

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