Fluid handling – Inflatable article – With gauge or indicator
Patent
1987-07-09
1989-04-11
Rivell, John
Fluid handling
Inflatable article
With gauge or indicator
137227, 137233, 116 34R, 731468, F16K 1520, F16K 3700
Patent
active
048196860
ABSTRACT:
A valve cap adapted to be screwed onto the valve of a pneumatic tire gives a pressure drop indication. To this end the valve cap comprises a deflectable diaphragm which separates the housing interior into a first chamber adjacent a transparent section of the closed housing end portion and a second chamber which is in communication with the tire interior through a port formed in a transverse housing wall and through the open tire valve. When the valve cap has been tightly screwed onto the tire valve and the tire valve has been opened, the desired tire pressure will be built up in both chambers. Upon closing of the second chamber a reference pressure corresponding to the desired tire pressure will prevail therein. Any reduction of the tire pressure relative to the reference pressure will cause the diaphragm to converge towards the transparent housing portion, thus serving as an indication.
REFERENCES:
patent: 2697999 (1954-12-01), Crookston et al.
patent: 2704045 (1955-03-01), Riesing
patent: 2866432 (1958-12-01), Laurie, Jr.
patent: 3111930 (1963-11-01), Zipper
patent: 3241514 (1966-03-01), Grimland
patent: 3792677 (1974-02-01), Frost
patent: 4082056 (1978-04-01), German
patent: 4103549 (1978-08-01), Schmidt
patent: 4606391 (1986-08-01), Achterholt
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