Field settable differential pressure switch assembly for low fluid pressure applications
US5061832A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1991 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Jan 28, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/2607
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A differential pressure switch assembly for low pressure applications permitting accurate "in field" set pointing of same, comprising a capsulized instrument that includes housing high and low pressure sections defining in assembled relation a pressure cavity across which such sections mount a flexible diaphragm separating high and low pressure chambers, with the low pressure section mounting at a site on the low pressure section a snap switch unit of a size appropriate for such assembly, which unit has a projecting plunger therefor that has an end portion disposed in the low pressure chamber of the unit, with the assembly further comprising a pressure differential sensor disposed for effecting electrical switching of the snap switch unit when the pressure of the assembly high pressure chamber exceeds that of the low pressure chamber by a predetermined differential. The pressure sensor comprises a leaf spring that is initially flat between its ends and is mounted at one end of same to extend across the assembly low pressure chamber so that the other end of same cooperates with the switch unit plunger to effect said electrical switch of same, and such other end of the leaf spring in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.