초록 ▼

A pressure cooker is disclosed having a safety interlock including a resilient gasket interposed between flat sealing surfaces of a receptacle and a cover, and configured to form a seal against the surfaces when they are spaced by a first distance, and to prevent formation of the seal when the surfa

A pressure cooker is disclosed having a safety interlock including a resilient gasket interposed between flat sealing surfaces of a receptacle and a cover, and configured to form a seal against the surfaces when they are spaced by a first distance, and to prevent formation of the seal when the surfaces are spaced by a second, smaller distance. The receptacle and cover are provided with interlocking lugs which are engageable in two different conditions to determine the first and second distances respectively. The gasket comprises an annular body having inwardly directed, axially diverging leg portions terminating in lip portions to seal against the sealing surfaces, and has faces with peripherally spaced bosses engageable by the sealing surfaces when at the second distance to decrease the divergence of the leg portions and so prevent seal formation. Y-shaped, V-shaped, and W-shaped cross sections for the gasket are shown.

대표청구항 ▼

In a pressure cooker including a receptacle and a cover, safety interlock apparatus comprising: (a) said receptacle and said cover having annular sealing surfaces disposed in juxtaposition; (b) interlocking lugs on said cover and receptacle, said cover being rotatable with respect to said receptacle

In a pressure cooker including a receptacle and a cover, safety interlock apparatus comprising: (a) said receptacle and said cover having annular sealing surfaces disposed in juxtaposition; (b) interlocking lugs on said cover and receptacle, said cover being rotatable with respect to said receptacle in a first direction between a first position in which said lugs are disengaged and a second, fully locked position; (c) a resilient gasket disposed between said sealing surfaces, said gasket having upper and lower faces and comprising upper and lower inwardly extending, diverging leg portions with inner peripheral sealing lip portions, and said gasket further having space, radially extending ribs formed on at least one of said upper and lower faces; (d) said interlocking lugs being so constructed and arranged that in the second position of said cover, a first distance between said sealing surfaces is established such that pressure within said pressure cooker can force the leg portions apart with said sealing lip portions pressed into sealing engagement with said sealing surfaces to thereby permit pressure to build up within said cooker; and (e) means associated with at least selected ones of said lugs for reducing the distance between said sealing surfaces with the cover located between said first and second positions to a second distance at which at least one of said sealing surfaces engage said ribs of said gasket to compress said leg portions together and prevent a seal from forming between said lip portions and said sealing surfaces, and for preventing rotation of said cover toward said first position from said second position so long as the distance between said sealing surfaces is greater than said second distance.