Stake notably for measuring the electrical resistances of ground connections
US4420918A · kind A · utility
9Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1981 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Oct 19, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H12/2223
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stake is provided in the form of a smooth cylindrical metal rod which has a point at its lower end and to which is welded a screw thread formed by a helical spring having a polygonal cross-section, preferably a square section, which is welded to the rod at a limited number of spaced-apart points, at least a part of the spring being thus free to move with respect to the rod. Preferably, only the lower end of the spring is welded to the rod. The stake is more especially, but not exclusively, usable for measuring the electrical resistances of ground connections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.