Measuring and testing – Testing sealed receptacle
Patent
1978-12-15
1980-02-19
Myracle, Jerry W.
Measuring and testing
Testing sealed receptacle
73 454, 73 493, G01M 336
Patent
active
041888197
ABSTRACT:
A check is provided of the gas pressure in a closed container having in its bottom wall a snap-action diaphragm of a type which assumes its concave-inward configuration when there is a vacuum of at least a predetermined level in the container, and assumes its convex-outward configuration when the vacuum level in the container is zero or less than said predetermined level. A test stand applies to the exterior of the diaphragm a vacuum sufficient normally to assure that it will assume its convex outward configuration, and then releases the applied vacuum to permit the diaphragm to snap to its concave-inward configuration. A proximity sensor produces an electrical signal representing the position of the diaphragm, which signal is differentiated to produce a signal indicating the speed of inward motion of the diaphragm. The differentiated signal is compared with a reference, and if it exceeds the reference, produces an indication that the inward snap-action has occurred and that the vacuum level in the container is adequate. The arrangement is applied to the high-speed checking of food containers for gas leaks.
REFERENCES:
patent: 1825699 (1931-10-01), Landrum
patent: 1825744 (1931-10-01), Landrum
patent: 1974026 (1934-09-01), Hicks
patent: 2040798 (1936-05-01), Schoonmaker
patent: 3094239 (1963-06-01), Baker
patent: 3371781 (1968-03-01), Armbruster et al.
patent: 3441132 (1969-04-01), Browning
patent: 3736899 (1973-06-01), Manske
patent: 3859844 (1975-01-01), Hruby
Egee Walter W.
Weaver George R.
Campbell Soup Company
Myracle Jerry W.
Roskos Joseph W.
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