Pressure cooker having safety opening means
AssigneeThe Prestige Group Limited
InventorGeoffrey Robinson
Life of this patent
Estimating the term…
Abstract
The body member and cover member of a pressure cooker are adapted to be held together by means of inter-engageable pairs of lugs arranged on each member. One or more selected pairs of lugs are constructed so that a shoulder on a first lug or lugs can interact with either of two linearly arranged projections carried by a second lug or lugs. The interaction of the selected pair of lugs produces two locking positions of the body and cover. The pressure cooker preferably incorporates a further safety mechanism, such as a gasket off-set device which prevents pressurization of the vessel if there is only partial overlap of the body and cover lugs.
Claims8
A pressure cooker comprising a body member and a cover member, a gasket positioned between the body member and the cover member, the cover member being adapted to be held on the body member by inter-engageable pairs of lugs, each pair of lugs comprising an outwardly directed lug on the body member and an inwardly directed lug on the cover member, the pairs of lugs being adapted to be brought into and out of engagement upon relative rotation of the cover member and body member, one or more selected pairs of lugs comprising a first lug or lugs carried by one member and a corresponding second lug or lugs carried by the other member, the first lug or lugs having a stepped portion forming a shoulder with the surface of the lug, and at least two linearly arranged projections carried by the second lug or lugs, the projections extending towards the surface of the first lug or lugs such that when the inter-engageable lugs are in the fully engaged position and the pressure within the pressure cooker exceeds a predetermined first value, a first projection of the second lug or lugs abuts a shoulder of a first lug preventing relative rotation of the cover and body members and furthermore when the inter-engageable lugs are in a selected partially engaged position with the first projection of the second lug or lugs clear of the shoulder of a first lug, disengagement of the lugs by relative rotation of the cover and body is prevented if the pressure within the cooker exceeds a second predetermined pressure, by abutment of a second projection on the second lug or lugs with a shoulder of the first lug or lugs.
In a pressure cooker made up of a cover member and a body member removably connected by a plurality of inter-engageable pairs of lugs, one lug of each pair being formed on the cover member and the other being formed on the body member, and being brought into and out of engagement upon relative rotation of the cover member and body member, the improvement comprising:
- a. at least one first lug having a stepped portion forming a shoulder with one surface thereof;
- and
- b. at least one second lug inter-engageable with said first lug having first and second projections linearly arranged thereon extending toward said first lug,
- whereby when said first and second lugs are fully engaged and the pressure within the cooker exceeds a predetermined first value, said first projection of said second lug is in a first position which engages said shoulder of said first lug preventing relative rotation of said cover member and said body member, and furthermore whereby when the internal pressure exceeds a second predetermined pressure, said second projection on said second lug is in a second position which engages said shoulder of said first lug preventing relative rotation of said cover member and said body member.
Dependencies are inferred from the claim text.