Pressure lid can

Details Pressure lid can Pressure lid can

1992-06-08

1994-08-23

Shoap, Allan N.

Receptacles

Closures

Removable closure retained by ductile in situ deformation

220308, 220284, 220672, B65D 4304

Patent

active

053399773

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a pressure lid can with an at least one-piece body member and a lid member which, together with a body element located on the closure-side end of the body member forms a tight closure, in which a lever gap is left between the body member and the lid member for the application of a lever by means of which the lid member can be levered up, as well as to a method for the manufacture of a hermetically sealed lid closure for a pressure lid can.
Such a pressure lid can is e.g. used as a paint can, whereof the press-in lid has a radially projecting rim, beneath which can be applied a lever, e.g. a screwdriver and the latter opens the lid closure in conjunction with the upper edge of the body member.
Such a pressure lid can is not suitable for perishable foods, which have to be sterilized, because during sterilization a high internal pressure occurs, which cannot be withstood by the closure.
In addition, a sterilizable grooved lid can is known (EP-OS 0 377 788), whose lid is fixed by a double grooved closure to the body member. The lid is provided in its marginal area with a ring groove-like depression serving as a lever gap, so as to be able to apply a lever, e.g. a spoon and in this way lever up the lid. For this purpose the sheet metal thickness in the bottom of the ring groove-like depression is weakened in the manner of tear-open lids by a crevice, so that on applying the lever the lid opens in the manner of tear-open closures without it being necessary to fix a pulling tab to the lid. The disadvantage of this sterilizable grooved lid can is the injury risk constituted by the sharp edge of the closure left behind on the body member. In addition, the disadvantages known in connection with tear-open closures still exist with respect to the functional reliability, if the weakening of the lid thickness by means of the crevice is not carried out with extreme accuracy. In addition, the handling security is impaired in that even minor impacts on the lid, e.g. during the transportation of grooved lid cans, can result in a closure leak due to the breaking open of the crevice. An additional disadvantage is that the lid is destroyed on opening, so that the can cannot be resealed with the original lid. Due to the necessary manufacturing precision such a closure is also expensive.


SUMMARY AND OBJECTS OF THE INVENTION

The problem to which the invention is directed to is to create a pressure lid can with a leverable lid closure, which on the one hand has a high sealing action and on the other which is easy to open and whose closure can be manufactured more simply and less expensively.
According to the invention this problem is solved in that the lid body has an all-round, resilient engagement or application lip, which engages in a closure corrugation of the body element from the inside and is accompanied by pretension.
The invention advantageously makes it possible to resiliently secure the lid member in the closure corrugation of the body element, so that the closure is held in the closure corrugation plane under pretension, in that the engagement lip is pressed with elastic force into the closure corrugation. The application of the lever to the lever gap ensures that on the one hand the engagement lip is drawn radially inwards, whilst the body element is pressed outwards. Thus, in the vicinity of the lever the engagement lip is disengaged from the closure corrugation, so that during further pivoting of the lever the lid can be completely levered out. The cross-sectional form of the closure corrugation is adapted to the engagement lip form, which ensures a more reliable seating of the closure and a high sealing action.
On closing the pressure lid can the engagement lip is initially pressed back radially inwards by the deformation of the all-round, resilient leg of the upper part and subsequently is locked under pretension in the body corrugation. The resilient design of the engagement lip additionally assists the sealing action in the body corrugation. The main advantage

REFERENCES:
patent: 1643252 (1927-09-01), McCrery
patent: 2344894 (1944-03-01), Ottesen
patent: 2416693 (1947-03-01), Hills
patent: 2467392 (1949-04-01), Kinberg
patent: 3329302 (1967-07-01), Kitchen
patent: 3456837 (1969-07-01), Medley
patent: 3514011 (1970-05-01), Madeira et al.
patent: 3616962 (1971-11-01), Phipps
patent: 3791551 (1974-02-01), Madeira
patent: 4171063 (1979-10-01), Cloutier
patent: 4676392 (1987-06-01), Giggard et al.

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