Helical conical spring lock-washer and method of formation thereof
US4302136A · kind A · utility
24Cited by
8References
9Claims
0Family size
Inventors
Key dates
| Filing date | Dec 20, 1979 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Dec 20, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B39/24
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A helical conical spring lock-washer includes a lock-washer body having formed on one surface thereof a plurality of triangular pyramid-shaped depressions. Each of the depressions provides a triangular opening formed on the respective surface of the lock-washer body, with the base of the triangular opening positioned adjacent to the outer margin of the lock-washer body and the apex of the triangular opening directed toward the center of the lock-washer body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.