Self-drilling screw
US4114508A · kind A · utility
21Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 10, 1977 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Jan 10, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9093
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A drill embodied in a self-drilling and self-tapping screw has a drill-point comprising a first sharp-pointed tip on the drill axis and a second sharp-pointed tip offset transversely of and axially behind the first tip. First and second cutting edges are inclined similarly to the axis on opposite sides thereof and have the first and second tips respectively at their respective leading ends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.