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Patent Searching and Data


Title:
DRIVER BIT USED ALSO FOR DETECTING SCREW FLOATING
Document Type and Number:
Japanese Patent JP2011104669
Kind Code:
A
Abstract:

To provide a driver bit used also for detecting screw floating capable of deciding quality as to whether a head seat surface of a screw is surely seated on a workpiece or a part, etc when the screw is fastened.

In the driver bit, a stopper 13 abutting on a head top surface when an engaging part 12 is engaged in a drive hole 22 is formed between a shaft 11 transmitted with a rotary drive force and the engaging part 12, a small clearance is formed between the bottom of the drive hole 22 brought into the engaged state by the abutment of the stopper 13 on the head top surface of the screw 20 and a tip of the engaging part, a diameter (D) of an outer peripheral circle of the stopper 13 is larger than a diameter (m) of a circumscribing circle of the drive hole 22, and thereby whether or not the head seat surface is seated can be exactly decided. The driver bit has a constitution in which the small clearance is formed between the drive hole and the tip of the engaging part of the drive bit, and thereby the quality decision of the screw floating is not adversely affected even if damage is generated in the drive hole or the engaging part due to a certain cause.


Inventors:
HAMANO SHINICHI
Application Number:
JP2009259257A
Publication Date:
June 02, 2011
Filing Date:
November 12, 2009
Export Citation:
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Assignee:
NITTO SEIKO KK
International Classes:
B23P19/06; B25B15/00; F16B23/00
Domestic Patent References:
JPH0224587Y21990-07-05
JPH11311226A1999-11-09
JPH08257849A1996-10-08
JPH08336731A1996-12-24