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| Refrigerated filter assembly and method of using same |
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| N-substituted thio alkyl phenothiazines |
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| Solar energy system |
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| Solar water heating apparatus |
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| Liquid fabric-softening composition |
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| Bi-level exhaust venting system for an eye level range |
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Pressure cooker
| Details |
Inventors: Walker, Duane H.; Quarderer, Darrell W.;
Assignee: National Presto Industries, Inc. (Eau Claire, WI)
Primary Examiner: Shoap; Allan N.
Assistant Examiner:
Attorney, Agent or Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt
A pressure cooker has a cover which is removably secured in pressure-tight relation to the cooker body. The cover has a centrally disposed valve, which regulates pressure development in the cooker, and an over-pressure release plug in the cover margin adjacent a cover handle, which separates from the cover in response to excessive pressure development in the cooker is captivated by an overhang portion of the cover handle which directs the escaping fluids away from the hand grip portion of the handle. The cooker also has a pressure-actuated interlock in the margin of its cover opposite the cover handle which inhibits removal of the cover when the cooker is in a pressurized condition, and prevents pressure build up in the cooker when the cover is incompletely locked to the cooker body. |
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DETAILED DESCRIPTION Having described the invention, what we claim is: 1.
A pressure cooker comprising an open top body and a cover which is closeable against the cooker about its open top in one related position only, the cover when closed in said one position against the cooker body being rotatable relative thereto through an angle of limited extent sufficient to effect a fluid tight connection therewith, said cooker body having an interiorly-located abutment adjacent the edge of its open top, the cover having a vent opening adjacent said edge in which is supported the stem of a vertically-reciprocatable lock member, said lock member being located at one end of the abutment member when initially closed in said one position against the cooker body, said lock member including a catch portion which passes beneath the abutment as the cover is rotated to a locking position beyond the abutment as the cover completes its rotation through said angle, said catch member when in said locking position being capable of rising to close the vent opening as pressure commences to develop in the cooker and be retained by said pressure at a height where it inhibits reverse rotation of the cover to its initial position, the catch portion being prevented by the abutment from rising to close the vent opening when the cover is incompletely rotated whereby pressure can build up in the cooker only when the lock member is in its locking position to prevent removal of the cover.
2.
A pressure cooker as claimed in claim 1 wherein the stem of the lock member includes a cap portion which seats over the vent opening when the lock member is in its relaxed position, the stem of the lock member incompletely filling the vent opening such that as the lock member starts to rise, and the cap portion lifts off its seat, air can escape as steam pressure builds until the catch portion is halted by its engagement with the cover and reseals the vent opening.
3.
A pressure cooker as claimed in claim 2 wherein the vent opening of the cover is defined by a sleeve member fixed in the cover, said sleeve member having a central bore through which the stem of the locking member extends, the wall of said bore having spaced vertical channels
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