TOOL FOR TIGHTENING SECURITY NUT, TOOL FOR RELEASING SECURITY NUT, TOOL FOR BOTH TIGHTENING AND RELEASING SECURITY NUT, AND SECURITY NUT FOR EXCLUSIVE USE OF THESE TOOLS

WIPO Patent Application WO/2005/028161

A1

A tool for tightening a security nut, a tool for releasing the security nut, a tool for both tightening and releasing the security nut, and the security nut for exclusive use of these tools enabling the easy tightening of the security nut and the easy removal, with an exclusive tool, of the security nut which cannot be easily removed with a normal tool. The tool (1A) for tightening the security nut used for tightening the security nut (N) formed in a generally truncated cone shape by screwing onto a bolt comprises a hollow body part (2) storing the outer peripheral tapered surface (n) of the security nut (N), a holding part (3) for rotation projectedly formed at the upper part of the hollow body part (2), a head part female screw part (4) passed to an internal space (21) along the axis of the holding part (3) for rotation and screwed to the bolt (B), and an elastic friction member (5) fixed to an inner wall surface (22), having an inner peripheral tapered surface (52) formed at a generally equal inclination angle according to the outer peripheral tapered surface (n), and having an elasticity.

ITO KATSUO (JP)

PCT/JP2004/013746

March 31, 2005

September 21, 2004

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KOYOKIZAI CO LTD (JP)
ITO KATSUO (JP)

B25B13/48; F16B23/00; F16B31/02; F16B35/00; F16B37/00; F16B41/00; (IPC1-7): B25B13/48; F16B23/00

JPH11351219A	1999-12-24
JPS4324000Y1	1968-10-09
JPH11156735A	1999-06-15
JPS60120772U	1985-08-15
JPS6457408U	1989-04-10
JP2000205225A	2000-07-25
JPH09183070A	1997-07-15

See also references of EP 1676675A4

Sagawa, Shingo (DANLOP-SK-Building 4-16 Odori-Nishi10-chome Chuo-ku Sapporo-shi Hokkaido, 42, JP)

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