Pressure checked electrical pressure switch
US4752658A · kind A · utility
32Cited by
8References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1987 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | Jun 22, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/2685
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical pressure switch is used on a hydraulic system to indicate the presence of a minimum operating pressure. The hydraulic fluid acts on a piston to move the piston against a force exerted by a calibration spring. Movement of the piston ultimately closes the contacts of a switch, thereby delivering an electrical signal indicative of minimum operating pressure. A check valve moves in concert with the piston and isolates the internal structure of the pressure switch from escalating hydraulic pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.