Fluid handling – Convertible – Unit orientable in a single location between plural positions
Patent
1980-12-22
1983-02-01
Cohan, Alan
Fluid handling
Convertible
Unit orientable in a single location between plural positions
137516, 137532, F16K 1712
Patent
active
043709990
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for limiting the pressure to at least two pressure levels for a steam pressure-cooker, more particularly to a device of the type comprising a cap which starts to rotate when the level of pressure selected for cooking is reached.
In known devices of this kind, the cap, to which a valve is attached, has an axial passage, the steam escape-duct, secured to the lid of the cooker, being adapted to slide in the said axial passage when the unit is in service. The centre of gravity of the cap is located below the seat arranged around the end of the duct for accommodating the valve, and the said cap is traversed by substantially tangential, eccentric vents connecting the said axial passage to the outside of the cap. Thus, as soon as the cooking pressure is reached, the valve lifts very slightly and starts to rotates, as a result of the escape of steam through the eccentric vents. One or two detachable tubular sockets may be fitted to the cap to increase the weight thereof, thus defining different cooking-pressure levels in the cooker.
These known devices have numerous disadvantages. For instance, if the user wishes to alter the cooking pressure, he must fit or remove the sockets. These sockets may furthermore fall while the cap is being handled, causing burns if they are hot as a result of a use of the cooker. Where cooking is carried out at a low pressure, the said sockets must be stored independently of the cap. Anyway, the user comes often to loss them definitively, leaving the cooker useless for anything but low-pressure cooking.
It is the purpose of the invention to overcome these disadvantages by providing a device limiting the pressure to at least two levels, the said device being of the type having a rotating cap, in which all of the constituent elements are secured either to the lid or the cap, and permitting quite simply a change from one cooking pressure to another.
The invention therefore relates to a device for limiting the pressure to at least two levels for a steam pressure-cooker, comprising a steam-escape-duct terminating externally in a valve-seat surrounding the duct aperture, the valve adapted to bear upon the seat in order to shut off the said duct, this valve being arranged in a cap having an axial cavity adapted to accomodate the escape-duct and connected to the outside by two substantially tangential vents, the said cap being weighted in such a manner that the centre of gravity thereof, when the unit is in use, is below the said seat.
According to the invention, this device is characterized in that it comprises an element permanently attached to the cap and displaceable manually between at least two positions, each defining a different pressure at which the valve lifts in relation to the steam-escape-duct.
All that is required to alter the maximal pressure in the cooker is to move the said element from one position to another. This eliminates any complex adjustments, and the user needs not worry about detachable parts which may easily be lost.
According to certain embodiments of the invention, the different settings of the displaceable element define different sections of closure of the duct by the valve, while the said valve comprises a plurality of different shut-off surfaces designed to bear upon the seat in the various settings of the mobile element.
The two different shut-off surfaces co-operate with the seat to define two different cross-sections for the action of the steam upon the cap, the largest cross-section corresponding to the lowest cooking pressure. This eliminates the need for the detachable sockets used in the prior art.
According to other embodiments of the invention, the displaceable element is a moving weight which, in the one position, is suspended from the cap, whereas in the other position it rests upon the lid of the cooker and is thus free of the cap.
If is therefore unnecessary to remove the moving weight, even for low-pressure cooking. The device, therefore, offers two pressure levels by varying the weight, but lacks the dis
REFERENCES:
patent: 2428483 (1947-10-01), Wittenberg
patent: 2485380 (1949-10-01), Hansen et al.
patent: 2524996 (1950-10-01), Sayers
patent: 2544186 (1951-03-01), Sayers
patent: 2692613 (1954-10-01), Waite
Cohan Alan
Seb S.A.
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