Press-type composite internally and externally threaded portion forming system for manufacture of drum bungs

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United States of America Patent

PATENT NO 11135640
APP PUB NO 20190247911A1
SERIAL NO

16264647

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Abstract

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The present invention relates to a press-type composite internally and externally threaded portion forming system. In this case, the press-type composite internally and externally threaded portion forming system includes an expansion-type collet core unit (10) and a contraction-type collet core unit (20) as its principal components so that internally and externally threaded portions are formed by means of a press method in a composite manner in such a way that the expansion forming force of the expansion-type collet core unit (10) and the contraction forming force of the contraction-type collet core unit (20) simultaneously act on the inner and outer circumferential surfaces of a workpiece in opposite directions.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kim, Mansoo Seoul, KR 12 27

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