Tire valve cap for measuring air pressure

Details Tire valve cap for measuring air pressure Tire valve cap for measuring air pressure

1996-09-20

1998-10-13

Rivell, John

Fluid handling

Inflatable article

With gauge or indicator

137228, 731468, P16K 1570

Patent

active

058197796

ABSTRACT:
In the state where a tire valve cap body has been fixedly screwed onto a valve mouthpiece, a top cover is pushed to open a tire valve, allowing introduction of a tire air pressure. A piston is slidably incorporated in a cylinder chamber defined within the top cover and is urged by a return spring. Upon the introduction of the tire air pressure, the piston is displaced to a position at which the biasing force of the return spring balances with the force of the introduced air pressure. An indication mechanism is provided to indicate, through an indication window formed in a cylinder member, a position of the piston member displaced by the tire air pressure introduced, thereby indicating a measurement value of the tire air pressure.

REFERENCES:
patent: 1276089 (1918-09-01), Loomis et al.
patent: 1422256 (1922-07-01), Conrad
patent: 1494001 (1924-05-01), McPherson
patent: 3889530 (1975-06-01), Bluem
patent: 3994312 (1976-11-01), Tanner et al.
patent: 4072048 (1978-02-01), Arvan
patent: 4136560 (1979-01-01), Gellos
patent: 4464929 (1984-08-01), Willis
patent: 4606391 (1986-08-01), Achterholt
patent: 4944323 (1990-07-01), Bartholomew et al.

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