Title:
ねじとドライバービットの組合せ
Document Type and Number:
Japanese Patent JP4493135
Kind Code:
B2
Abstract:
A combination of a screw and a screw driver bit and a header punch for its manufacture capable of effectively preventing a come-out phenomenon of the screw driver bit by improving the structure of a groove part in a cross groove of a screw to prevent a conventional damage.
Inventors:
Katsuyuki Tozu
Application Number:
JP2000000673A
Publication Date:
June 30, 2010
Filing Date:
January 06, 2000
Export Citation:
Assignee:
Katsuyuki Tozu
International Classes:
F16B23/00; B21K1/46; B21K1/48; B25B15/00
Domestic Patent References:
| JP3292407A |
Foreign References:
| US2216381 | ||||
| WO1999043472A1 |
Attorney, Agent or Firm:
Honda Takashi