Tapping screw

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United States of America Patent

PATENT NO 8632289
APP PUB NO 20110305541A1
SERIAL NO

13152354

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Tapping screw (1) has conical portion (4) at the end of cylindrical portion (3) and thread (6) of tapered screw portion (M) disposed at conical portion (4) are formed of single-start threads roughly pitched, wherein the tip angle of conical portion (4) is conically formed at an acute angle of about 30 degrees, and second thread (7) extending in parallel with thread (6) of tapered screw portion (M) is disposed at the end of conical portion (4), forming double-start thread (6, 7) at the end of conical portion (4), and the axial length of tapered screw portion (T) formed of double-start thread (6, 7) is greater than the thickness (upper limit 1.6 mm) of the metal sheet to be fastened.

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First Claim

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Patent Owner(s)

  • QP FASTENING WORKS CO., LTD.

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Shinjo, Kimio Osaka, JP 4 24

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