Method for integrally forming a stop flange on a self-tapping screw by threading dies

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United States of America Patent

PATENT NO 11739784
APP PUB NO 20210040976A1
SERIAL NO

17083683

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Importance

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Abstract

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A method for forming a stop flange on a self-tapping screw includes locating a shank of a self-tapping screw between two threading dies, fixing one of the two threading dies and moving the other one of the two threading dies to work the shank, the external thread forming section of each of the threading dies performing threading to form an external thread on the shank, inserting the insert and the recessed corner of each of the threading dies into a top of the external thread to form a groove in the shank, and the insert of each of the threading dies gradually squeezing downward an extruded portion that is formed during formation of the groove to form a stop flange on the shank. Thus, the shank is integrally formed with the stop flange, to stop an excessive movement of the external thread.

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Patent Owner(s)

Patent OwnerAddress
CHEN WEI CHIHNot Provided

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Wei-Chih Taichung, TW 184 719

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