Indicating gauge with pressure relief valve
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United States of America Patent
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-
Feb 15, 1983
Grant Date -
N/A
app pub date -
Feb 2, 1981
filing date -
Feb 2, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicular instrument or gauge of the type that has a sealed housing filled with an inert gas and a pressure responsive drive assembly for an indicating element such as a needle pointer. The housing is provided with a pressure relief valve to relieve excessive pressure within the housing that includes an inwardly facing integral frusto-conical projection with a central aperture in the back of the housing that receives a valve member which is actually a rivet covered by a flexible adhesive such as silicone rubber. The amount of adhesive and the housing wall area covered by adhesive determine, with the diameter of the head of the rivet, the pressure at which the rivet will be blown from the housing relieving internal pressure.
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