Screw head and tool for use therewith
US8739660B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2010 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Feb 2, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B23/0053
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Disclosed is a screw head having a 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, there is a ‘stick fit’ between the surface of the tapered recess (11) and the external surface of the lower engagement section (17), and there is no engagement with the sloping transition surface (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.