Title:
いじり防止ねじ及びドライバービットとの組合せ並びにいじり防止ねじ製造用ヘッダーパンチ
Document Type and Number:
Japanese Patent JP4197599
Kind Code:
B2
Abstract:
The screw (10A) has slope portions (15) extending from edges (12a) of a screw head (10a), towards the center of neck portion (10b), step portions (14) between the slope portions, and conical bottom face (13) at center where slope portions meet. A hole (16) having maximum diameter and inverted conical trapezoidal shape, is extended to bottom face adjoining slope portions except step portions. Independent claims are also included for the following: (1) combination of screw and screwdriver bit; and (2) header punch.
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Inventors:
Katsuyuki Tozu
Application Number:
JP2002142770A
Publication Date:
December 17, 2008
Filing Date:
May 17, 2002
Export Citation:
Assignee:
Katsuyuki Tozu
International Classes:
F16B23/00; B21J13/02; B21K25/00; B25B13/48; B25B15/00; F16B41/00
Domestic Patent References:
| JP55080512U | ||||
| JP11236910A | ||||
| JP57169812U | ||||
| JP3074989U | ||||
| JP56014614A | ||||
| JP6030514U | ||||
| JP1141914U |
Attorney, Agent or Firm:
Honda Takashi