Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DRIVER BIT
Document Type and Number:
Japanese Patent JP2011143522
Kind Code:
A
Abstract:

To provide a driver bit capable of surely loosening a screw to remove even when not only an operation groove but also a corner part of a base end part of a fan-shaped wall are completely broken or deformed.

The driver bit 3 includes a tightening/loosening operation part 10 including five or more rib-shaped projections 11 which are radially protruded and formed toward the horizontal outer direction at the lower end of a bit body 8, and a valley groove 12 formed between adjacent rib-shaped projections 11. Each of the rib-shaped projections 11 is composed of a rib peripheral surface 13 formed in vertically cylindrical outer surface shape, and a pair of valley groove peripheral surfaces 14, 14 for sandwiching the rib peripheral surface 13 therebetween. A biting part 20 driven in a peripheral wall 7 of a damaged recessed part 6 is formed at a corner part of the lower outer edge of each of the rib-shaped projections 11 defined by the lower end surface of the rib-shaped projections 11 and the rib peripheral surface 13.


Inventors:
TAKASAKI MITSUHIRO
KAWAI SHINNOSUKE
Application Number:
JP2010007798A
Publication Date:
July 28, 2011
Filing Date:
January 18, 2010
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
ENGINEER INC
International Classes:
B25B15/00
Domestic Patent References:
JP2001162552A2001-06-19
JPS462080Y11971-01-23
Attorney, Agent or Firm:
Satoshi Morimoto