Removable, in-place refrigerant pressure check gauge
US4777828A · kind A · utility
Inventor
Key dates
| Filing date | Aug 3, 1987 |
| Grant date | Oct 18, 1988 |
| Priority date | — |
| Expiry date | Aug 3, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L7/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A removable, in-place pressure check gauge connectable to the normally closed low pressure test and service valve fitting in the refrigerant circuit of a car air conditioning system has a hollow cylindrical body with first and second open opposite ends. The first end has secured thereto a connection fitting that may be threaded onto the test and service valve, and functions to hold the valve in an open position to admit pressurized refrigerant into the gauge body. The refrigerant exerts a pressure force on a seal element supported for axial movement within the body against the biasing force of a compression spring therein. Pressure-caused movement of the seal element toward the second body end is operative to move an elongated pressure indicating rod from a retracted position within the body outwardly through the second body end to an extended position indicative of the refrigerant pressure. Visual determination of the refrigerant pressure is facilitated by numerical pressure markings and color-coded pressure zone indicia formed on the pressure indicating rod and corresponding to similar pressure indicia on the exterior of the gauge body. After the refrigerant pressure reading has …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.