Title:
ネジの頭部ならびにそれに用いる工具
Document Type and Number:
Japanese Patent JP2009534618
Kind Code:
A
Abstract:
The invention provides a screw head having a hexalobular slot (2) in the upper surface of the screw head, an upper peripheral wall (9) of hexalobular planform extending down into the screw head, the upper peripheral wall (9) being parallel or near parallel to the axis of the screw, a sloping transition surface (15) extending downwardly and inwardly with respect to the lower edge of the upper peripheral wall (9), and a tapered recess (11) extending downwardly from the lower edge of the sloping transition surface (15), in which the dimensions of the screw head are such that when the screw head is engaged by a tool (6) having upper (16) and lower engagement (17) sections, the lower engagement section (17) is tapered, and there is a ‘stick fit’ between the surface of the tapered recess (11) and the external surface of the lower tapered engagement section (17), and there is no engagement with the sloping transition surface (15).
Inventors:
Edland, Youn
Application Number:
JP2009507612A
Publication Date:
September 24, 2009
Filing Date:
November 09, 2006
Export Citation:
Assignee:
TTAPDRIVE AS
International Classes:
F16B23/00
Domestic Patent References:
| JPS5158256U | 1976-05-07 | |||
| JPS5015897U | 1975-02-19 | |||
| JPS63121807U | 1988-08-08 | |||
| JPS5973623U | 1984-05-18 | |||
| JP2004353831A | 2004-12-16 |
Foreign References:
| US6951158B1 | 2005-10-04 | |||
| US3273442A | 1966-09-20 | |||
| WO2001049459A1 | 2001-07-12 |
Attorney, Agent or Firm:
Keiichi Ota