Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1995-03-08
1997-03-25
Crane, Daniel C.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
163 5, 604272, 72703, B21H 714
Patent
active
056133910
ABSTRACT:
A machine and method for knurling an end portion of a cylindrical workpiece including a hypodermic needle or biopsy needle. The machine includes a base to which a reciprocating mechanism and a serrated block are attached. A pressure bar is positioned above the base and has a second serrated block attached thereto. The pressure bar is reciprocated back and forth, each movement comprising a stroke. A pair of lobes are attached to the top surface of the pressure bar. A pair of roller blocks are also attached to the base, each roller block having a rectangular opening and a roller located therein. The pressure bar passes through the rectangular openings. As the pressure bar is reciprocated back and forth and the lobes come into contact with the rollers, the pressure bar is biased toward the base whereby a knurl is formed in a workpiece placed between the two serrated blocks. A method for knurling an end portion of a cylindrical workpiece is also disclosed.
REFERENCES:
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patent: 2020659 (1935-11-01), Frost
patent: 2191771 (1940-02-01), Olson
patent: 2411932 (1946-12-01), Mitchell
patent: 4252009 (1981-02-01), Grohoski
patent: 4869259 (1989-09-01), Elkins
patent: 5201760 (1993-04-01), West
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