Thread form for soft material
US4576534A · kind A · utility
40Cited by
8References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1983 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Aug 4, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B25/0068
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A screw for soft material having an assymetrical thread form which includes an upper flank comprised of a plurality of continuous helical surfaces. The upper flank surfaces are configured such that a helical protrusion is formed on the upper flank which causes increased friction between the screw and the workpiece only after seating of the screw head has occurred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.