Receptacles – Closures – With condition responsive vent or valve
Patent
1977-08-15
1978-08-01
Price, William
Receptacles
Closures
With condition responsive vent or valve
220316, B65D 5116, B65D 4500
Patent
active
041038010
ABSTRACT:
A pressure cooker has a vent opening in its cover in which a sealing plug rises in response to pressure developed in the cooker and the cover handle has a slidably mounted lock member which is manually movable into an "open" position when its abutment portion overlies the vent opening to prevent rise of the plug and thereby development of pressure within the cooker. The lock member can be moved out of said "open" position into a "cook" position where its abutment portion is clear of the vent opening and the plug is free to rise and seal the vent opening to permit pressure development within the cooker. The lock member, however, has a catch portion which, in the cook position of the lock member, catches with a cooker body handle so that the cover cannot be rotated relative to the cooker body, as is required to remove the cover from the cooker. In the raised or "pressure actuated" position of the sealing plug, its stem prevent return of the lock member to its "open" position and the cover cannot be removed from the cooker.
REFERENCES:
patent: 2483297 (1949-09-01), Naylor
patent: 2538583 (1951-01-01), Morrison, Jr.
patent: 3973694 (1976-08-01), Tess
National Presto Industries, Inc.
Price William
Shoap Allan N.
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