Receptacles – Closures – Having means for securing or retaining closure in its closed...
Patent
1985-10-29
1986-11-04
Hall, George T.
Receptacles
Closures
Having means for securing or retaining closure in its closed...
B65D 4500
Patent
active
046206434
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a safety device for closing and opening a pressure cooker, such as an autocooker.
This device is applicable to pressure-cooking appliances comprising a vessel on which is mounted a lid, the rim of the lid and the rim of the vessel being provided with locking ramps which are intended to engage beneath each other by rotation of the lid on the pressure vessel. This closure system is commonly referred to as a bayonet locking system.
The lid and the pressure vessel are each fitted with a handle. In order to lock the lid in position, the lid handle is rotated until it comes into position directly above the vessel handle.
At the end of the cooking operation, it is absolutely necessary for the user to produce a pressure drop within the appliance before opening the lid. If this requirement is not met, any abrupt escape of steam from the pressure cooker might produce serious burns.
Accordingly, pressure cookers of known types are usually provided with a relief valve which the user must either remove or place in the steam exhaust position.
However, there is always a possibility that the user may forget to perform this operation.
In consequence, it is highly desirable to produce a safety device which prevents the user from opening the lid as long as the appliance still remains under pressure.
In certain types of cooking appliances such as the pressure cooker described in French Pat. No. 2,484,817 granted to the present Applicant, the lid has an orifice which communicates with the interior of the pressure vessel and in which is mounted a rod fitted with a valve for the purpose of closing said orifice when the pressure within the vessel attains a predetermined value.
In the French patent cited in the foregoing, there was described a pressure-cooking appliance comprising a vessel on which is mounted a lid, the rim of said lid and the rim of the pressure vessel being provided with ramps so arranged as to engage one beneath the other and to lock the lid on the pressure vessel by rotational displacement. Said lid and said vessel are each provided with a handle. The lid is provided with an opening which communicates with the interior of the pressure vessel and in which is mounted a stem fitted with a valve for the purpose of closing said opening when the pressure within the vessel attains a predetermined value.
This cooking appliance is equipped in addition with a safety device comprising associated means for cooperating with the lid-valve stem in order to prevent closure of the valve as long as the two handles are not in the closed position and in order to prevent opening of the lid when the two handles are in the locking position, that is to say as long as the valve is in the closed position.
The means referred-to in the foregoing comprise a stud movably mounted within a handle and adapted to cooperate with the end of one of the ramps for locking the rim of the vessel in order to prevent opening of the lid. Said stud is rigidly fixed to a lug provided with an opening located opposite to the valve when the stud is in the locking position, with the result that the valve is capable of engaging in said opening when the appliance is under pressure, thus preventing any displacement of the lug and of the stud.
Said device provides users with an appreciable degree of safety but is attended by the following drawbacks:
This device makes it necessary to modify one of the locking ramps of the vessel in order to form a notch in the end portion of the ramp for the purpose of ensuring effective locking of the stud. This additional operation complicates the manufacture of the vessel and has the effect of reducing the strength of the locking ramp. Furthermore, this ramp has a thin edge and a level stage of relatively substantial length which is applied against the stud at the time of opening and closing of the lid, thus resulting in rapid and irreparable wear of these two parts.
In addition, the control button which produces the displacement of the stud with respect to the locking ramp is associated with a
REFERENCES:
patent: 2566008 (1951-08-01), Westby
patent: 4103801 (1978-08-01), Walker
patent: 4512495 (1985-04-01), Bauer et al.
patent: 4541543 (1985-09-01), Elexpuru
Hall George T.
Seb S.A.
LandOfFree
Safety device for opening and closing a pressure-cooking applian does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Safety device for opening and closing a pressure-cooking applian, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Safety device for opening and closing a pressure-cooking applian will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-693678