Low resistance electrical spring probe
US4461993A · kind A · utility
6Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1981 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Sep 21, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R1/067
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electrical probe having a spring loaded moving contact in which a compression spring and the inner end of the contact are confined within a tubular member. Low resistance is maintained between the moving contact and the tubular member by applying a lubricant to the coil spring. The lubricant is a synthetic grease having a synthetic oil base and a lithium hydroxy stearate mixed in the oil base. Because of the high viscosity and high shear strength of the lubricant, it prevents the buildup of particulate matter which tends to increase the resistivity of the sliding interface between the contact and the tubular member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.