Method of producing left-right screw

Details Method of producing left-right screw Method of producing left-right screw

2007-05-15

2007-05-15

Tolan, Ed (Department: 3725)

Threaded, headed fastener, or washer making: process and apparat

Process

Making externally threaded fastener, e.g., screw or bolt

C470S066000, C470S185000

Reexamination Certificate

active

10567955

ABSTRACT:
The present invention provides a method for manufacturing a right- and left-hand screw having a first external right-handed thread and a second external left-handed thread formed by an inexpensive rolling process using a rolling die with a first thread-cutting die for the first thread and a second thread-cutting die for the second thread.

REFERENCES:
patent: 2419555 (1947-04-01), Fator
patent: 3260100 (1966-07-01), Wieber
patent: 3600981 (1971-08-01), Wagner
patent: 3854350 (1974-12-01), Bauer et al.
patent: 5569009 (1996-10-01), Suzuki
patent: 6957557 (2005-10-01), LeVey
patent: 2866462 (1998-12-01), None
patent: 11-25472 (1999-09-01), None
patent: 2003-184848 (2003-07-01), None

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