ねじおよびドライバビット

Japanese Patent JP5303080

B2

Provided are a screw (11) which can significantly reduce the cam-out if a dedicated driver bit is (14) used, and which also allows the use of a driver (6) bit for a standard cross recess and can reduce the cam-out to some extent, and a dedicated driver bit (14) for such a screw (11). Of a recess (13), a central portion (17) and proximal end side portions (18a) of blade engaging portions (18) are configured in the same manner as in a standard cross recess. The tightening side sidewall (20) or the loosening side sidewall (21) in the distal end side portions (18b) of blade engaging portions (18) are bent at an oblique angle. A dedicated driver bit has a corresponding cross-sectional configuration to that of the recess (13). Because the dedicated driver bit is hard to tilt relative to the screw (11) and the engagement between the blades (19) of the driver bit (14) and the blade engaging portions (18) is improved, the cam-out becomes hard to occur. A standard driver bit can also be used, because the central portion (17) and the proximal end side portions (18a) of four blade engaging portions (18) are similar to those of a standard cross recess.

JPS6123512	[Title of the device] Anti-theft Nut
JPS60127110	[Title of the device] Co-rotating prevention bolt
JP3206548	Bolt nut

Terubun Nojikawa

JP2007168378A

October 02, 2013

June 27, 2007

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Terubun Nojikawa

F16B23/00

JP11311226A
JP2000108043A
JP2001193719A
JP2005106269A
JP6511303A
JP56014614A
JP2004144250A
JP2000230526A

US4187892

Izumi Omori

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