Tapping screw
US4793756A · kind A · utility
6Cited by
7References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1986 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Oct 14, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9093
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A tapping screw includes a screw head, a self-tapping thread portion and a drilling point. The drilling point has a pair of approximately axially extending flutes which are located diametrically opposite each other relative to the shank axis and include clearing surfaces and cutting surfaces. The cutting surfaces end in cutting edges facing the point of the screw and lateral outer knives. Immediately adjacent the cutting edges or cutting knives, the cutting surfaces have a convexly arched cross-sectional shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.