Title:
ドライバービット
Document Type and Number:
Japanese Patent JP3147157
Kind Code:
U
Abstract:
An improved screwdriver head structure having a blade portion 21 and a connecting portion 31, characterized in that: the blade portion 21 is located on one end of the screwdriver head 11 and has two or more engaging surfaces 24, wherein each of the engaging surfaces 24 is regularly disposed with a plurality of protruding cones 26 at equal distance, the tip of each of the protruding cones 26 has a touching point 28, and the touching points 28 of the protruding cones 26 are on the same plane 51; the connecting portion 31 is located on the other end of the screwdriver head for the connection with a screwdriver handle; and when a user uses the blade portion 21 to fasten a screw 41, the touching points 28 of the protruding cones 26 on the blade portion 21 fully engage with the screw 41, thereby providing larger friction and even force distribution.
Inventors:
Yellow
Application Number:
JP2008006992U
Publication Date:
December 18, 2008
Filing Date:
October 06, 2008
Export Citation:
Assignee:
Yellow
International Classes:
B25B15/00
Attorney, Agent or Firm:
Masaki Hattori
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