Title:
ねじ保持形ドライバービット及びねじとの組合せ
Document Type and Number:
Japanese Patent JP4280457
Kind Code:
B2
Abstract:
A screw holding screwdriver bit capable of effectively preventing a come-out from occurring by improving the structure of the blade portions thereof, capable of being manufactured in a simple structure at a low cost, and capable of remarkably increasing a working efficiency by allowing an appropriate and rapid screw tightening operation at all times, and the combination thereof with screws, the driver bit including a plurality of blade portions (12) having generally vertical end edge portions (13) formed at the tip ends (12a) thereof, wherein one of the blade portions (12) is cut out in the axial direction of the bit, a guide passage (16) of a specified length is provided in a shaft (11) portion continued generally on the extension of the cutout portion (15) of the blade portion, and an elastic piece (18) allowed to elastically abut on a bit engagement groove in a screw head and having a screw holding function by the interaction thereof with the blade portion fitted in the bit engagement groove is inserted in the guide passage.
Inventors:
Katsuyuki Tozu
Application Number:
JP2002115972A
Publication Date:
June 17, 2009
Filing Date:
April 18, 2002
Export Citation:
Assignee:
Katsuyuki Tozu
International Classes:
B25B15/00; B25B23/10
Domestic Patent References:
| JP51148795U | ||||
| JP2000108043A | ||||
| JP49069496U | ||||
| JP49007560B1 | ||||
| JP47036000A | ||||
| JP4725115Y1 | ||||
| JP5166898U |
Foreign References:
| US4007768 | ||||
| US3286749 |
Attorney, Agent or Firm:
Honda Takashi
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