Method and apparatus for producing dual synchronized threads

Details Method and apparatus for producing dual synchronized threads Method and apparatus for producing dual synchronized threads

1994-01-07

1999-02-16

Hail, III, Joseph J.

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

Process

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

470 80, 470199, B21H 302

Patent

active

058714030

ABSTRACT:
Method and apparatus are disclosed for forming dual synchronized threads on the interior and exterior cylindrical portions of a tube or pipe, and in the inner and outer cylindrical surfaces of an annular channel formed in an object. The method for producing dual synchronized threads includes initially defining a rotational zero point on the object where the first set of threads is to begin, cutting or forming the first set of threads, determining a rotational zero point on the object where the second set of threads is to begin, the second rotational zero point being relative to the first rotational zero point, and cutting or forming the second set of threads with the same lead as the first so that the two sets of threads will be synchronized and their starting points will be in some specified relationship to each other. An apparatus is also disclosed for cutting dual synchronized threads, the apparatus comprising a combination tap and die for simultaneously cutting dual threads on and in an object. The tap threads and die threads of the combination tap and die are synchronized such that their thread leads are identical, and their rotational zero points are related such that the resulting male and female threads on the object are synchronized.

REFERENCES:
patent: 1494464 (1924-05-01), Cressey
patent: 3344450 (1967-10-01), Russo
patent: 4170050 (1979-10-01), Bosse
patent: 5076744 (1991-12-01), Kitagawa et al.
patent: 5098232 (1992-03-01), Benson

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