Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1983-02-07
1985-01-29
Swisher, S. Clement
Measuring and testing
With fluid pressure
Dimension, shape, or size
137503, G01B 1300
Patent
active
044957947
ABSTRACT:
An automatic on-off valve for use with a pneumatic micrometer connected between the main body of a pneumatic micrometer and its measuring head for economizing the consumption of pressurized air includes a valve body having, between an inlet and an exit thereof, a main flow passage to be opened and closed by a valve member and a sub-flow passage always open with a slight gap. The valve member is automatically turned on or off by the back pressure difference at the measuring head between a measuring state and a not-measuring state. The total open cross sectional area for both of the flow passages are set to be 6 to 9 times as large as the cross sectional area for a flow passage which is formed between a nozzle of the measuring head and an object to be measured upon the object being placed to measure the maximum gap, whereby a measuring error resulting from the disposition of the automatic on-off valve can be minimized within an allowable range to thereby maintain the measuring accuracy a desired high level.
REFERENCES:
patent: 2192042 (1940-02-01), Hoffman
patent: 2918933 (1959-12-01), Boitnott
patent: 2926523 (1960-01-01), Baker
patent: 3077767 (1963-02-01), Ollivier
Sagara Hisao
Takada Susumu
Huskvarna Transportkonstruktioner AB
Swisher S. Clement
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