Vibration resistant screw
US4258607A · kind A · utility
38Cited by
14References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Sep 28, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B25/0063
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The shank of a self tapping screw has a thread forming section, a threaded section, and a reduced diameter section interconnecting the forming and threaded sections. The thread forming section forms internal threads into a known thread form that has a wedge ramp at its root. The threaded section comprises threads of standard form having the same pitch as the thread forming section. The reduced diameter section is slightly longer than an integer multiple of the pitch so that the threaded section is backset slightly from the forming section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.