Receptacles – Closures – Crossbar carries closure and serves as closure fastener
Reexamination Certificate
2001-06-27
2002-12-17
Newhouse, Nathan J. (Department: 3727)
Receptacles
Closures
Crossbar carries closure and serves as closure fastener
C220S315000, C220S324000, C220S326000, C292S258000, C292S25900A
Reexamination Certificate
active
06494337
ABSTRACT:
The present invention relates to a lid for a pressure cooking receptacle.
The traditional pressure cooking receptacle of interest for the present invention is that wherein closure of the receptacle is accomplished by a jaws system.
This traditional blocking system is formed by at least two jaws radially mobile on the lid between a retracted position of closure of the receptacle and an extended position of opening of the receptacle.
In particular the edge of the mouth of the cooking receptacle is bent outwards in order to be secured by the jaws and ensure pressure tightness.
An undoubted advantage of such a blocking system, particularly compared to the bayonet blocking system, consists in the fact that, thanks to the configuration of the edge of the mouth, the receptacle can also be used merely as a pan or saucepan for cooking foods at atmospheric pressure.
Other advantages of the jaws blocking system, compared again to the bayonet blocking system, consist in its versatility of operation due to the fact that it allows engaging of the lid on the receptacle irrespective of the relative angular position between the one and the other, and due to the fact that it can also be attached to non-circular, for example oval, lids and hence without restraints as regards the shape of the cooking receptacle.
Contrarily a traditional jaws blocking system has a complex structure due to the need to control the movement of closure and opening of the jaws alternatively.
In this respect in fact the jaws are attached to a respective mobile control arm, and the mobile arms must have interconnection parts such as to perform synchronised actuation of the jaws in the operation of opening and closure of the receptacle.
In some traditionally known solutions separate mechanisms are dedicated to the opening and to the closure of the jaws.
In others, for opening of the receptacle, a push-button is used on the lid which is capable of moving the arms of the jaws radially outwards and special elastic return parts are inserted between the arms of the jaws which are loaded during extension of the jaws so as to return the same subsequently into the initial retracted position.
One object of the present invention is that of remedying the disadvantages suffered by a traditional lid of a pressure cooking receptacle fitted with a jaws closure/opening system.
In particular one object of the present invention is that of providing a lid for a pressure cooking receptacle with a simplified structure and mode of operation for the closure of the cooking receptacle.
Another object of the present invention is that of providing a lid for a pressure cooking receptacle formed by a minimum number of parts which is therefore also less expensive.
The present invention achieves these objects by providing a lid for a pressure cooking receptacle supporting a jaws device for closure/opening of the receptacle, a device for controlling opening/closure of the receptacle and a safety device for blocking closure of the receptacle, characterised in that said closure/opening device comprises a first radially retractable jaw for securing the lid to the receptacle and extensible for release of the lid from the receptacle and at least one second jaw integral with the lid, and in that said control device comprises a radial arm for moving the mobile jaw, attached to the mobile jaw at its radially external end, and a lever which can be actuated manually, fitted with means which can be engaged with said radial arm for controlling the stroke of said radial arm.
The presence of a single mobile jaw allows a considerable reduction in the number of parts forming the mechanism of movement of the system for closure of the receptacle, while the lever control allows the mobile jaw to be actuated during opening and closure simply by reversing the direction of rotation of the lever.
The use of a lever control system also eliminates the need to use return parts for retracting the jaws, whose intactness would moreover guarantee the correct closure of the receptacle.
The other jaw, or possibly other jaws, being integral with the edge of the lid, can easily be designed with a wide angular opening as required, thus contributing to a more even distribution of the stresses, caused by the pressure which is generated inside the receptacle, on the mouth edge of the receptacle itself and on the external edge of the lid.
The safety device for blocking closure of the lid finally is advantageously suitable for a number of alternative solutions, all aimed at blocking the control lever when the receptacle reaches a preset pressure.
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Lagostino S.p.A.
Newhouse Nathan J.
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