Foods and beverages: apparatus – Cooking – Diverse cooker types
Reexamination Certificate
1999-08-06
2001-01-16
Alexander, Reginald L. (Department: 1761)
Foods and beverages: apparatus
Cooking
Diverse cooker types
C099S403000, C099S413000, C219S440000, C219S439000
Reexamination Certificate
active
06173643
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pressure cooking utensil which is a combination of a current electric pressure cooker and an electric rice cooker, and is a kind of a pressure electric steaming pot.
BACKGROUND OF THE INVENTION
Existing electric pressure cookers on sale in the current market have no built-in electric heating device. As such, they can not work under a condition without an outside heating source, and this is an inconvenience for the existing electric pressure cookers. Moreover, electric pressure cookers are not very safe, resulting frequent accidents from overpressure explosions, thus hurting people. Furthermore, existing electric pressure cookers are accompanied by a huge loss of steam, such that cooked foods will lose some of their deliciousness and flavor, and will not achieve original extract and inherent tastiness to give perfect satisfaction.
Existing electric pressure cookers on sale in the current market, despite having a heating source, can only cook under atmospheric pressure, and do not have the advantages and functions of electric cookers.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a new generation of cooking utensils possessing not only an electric pressure cooker pressure cooking function but also automatic control and a self-contained heating source function.
Another object of the present invention is to provide a safety type pressure cooking utensil with a dynamic pressure release type safety pressure control arrangement aiming at solving the safety problems of existing electric pressure cookers.
A further object of the present invention is to provide a new type of electric pressure cooker that exhausts less steam or no steam during cooking, so as to keep the original extract and inherent flavor of foods and to give no greasy smoke pollution for a clean and hygienic environment.
These objects are achieved utilizing a multifunctional electric pressure cooker comprising a pot cover, a pot body, a turning handle cooking setting mechanism, an automatic temperature control mechanism and a built-in electric heating device. The pot body further comprises an outer pot built-in inside of a housing, an inner pot rested in an overlap-sleeve inside the outer pot. The outer pot constitutes an elastic buckle-joint between the pot body and pot cover through a buckle coupling of its elastic pot flange with elastic flange of the pot cover. The inner pot and the pot cover, through a seal ring, form a dynamic hermetic holding chamber able to expand and contract along a vertical direction. The outer pot has a bottom with elastic corrugated slots, which when receiving pressure from an upper side of the inner pot will produce a downward displacement magnitude (deformation magnitude) for controlling pressure and temperature inside the pot and eventually controlling the touch to cut off the power supply to an electric heating disc. In the hollow chamber formed between the housing inner wall and the outer pot outside wall is provided a cooking state setting mechanism to carry on settings using a rotary cam, which further comprises a heat expansion displacement chain constituting an inner pot, heating disc, outer pot bottom and displacement transfer rod at the lower side of the outer pot bottom, which further comprises a preset displacement chain constituting a cam, cam driving rod, and a spiral adjusting rod, between the terminal of the preset displacement chain, which is connected to an electric current flash activate switch. The flash activate switch comprises a pair of contacts and a horizontally arranged spring leaf. The static contact of the flash activate switch keeps a relative static fixation with the displacement transfer rod. While its moving contact is fixed on the lower lateral surface of the spring leaf, the inner end of the spring leaf, through clamping of an insulating bead, keeps a relative static fixed connection with the displacement transfer rod. Its outer end is fixedly connected with the lowest end (terminal) of the vertically arranged preset displacement chain. The displacement transfer rod is generally in a horizontal arrangement. Its inner end is fixedly connected with the outside of the outer pot bottom on the lower lateral surface. A contact head is fixed on its free end, and is always in pressure connection with the arch portion of the flash activate switch spring leaf. The flash activate switch, after receiving a slight contact pressure, will jump in a flash to cut off current supply required by the electric heating device and to stop the entire cooking process. Under common action of two displacement chains, the pressure and temperature are under effective control in the pot during the entire cooking procedure. Between the pot cover and inner pot is provided a dynamic pressure release seal device. The device is mutually formed by a flexible seal ring fixed on the pot cover inner chamber peripheral wall. Pressure release notches are cut on the inner pot upper rim outward-folded annular edge. The flexible seal ring has a skirt ring hanging downward. Under a hermetic state, the skirt ring under action of internal steam pressure is mutually nestled against the inner wall of the inner pot upper rim to completely close the pressure notches. When pressure in the pot increases, the pot cover produces an upward elastic displacement while the inner pot produces a downward displacement. Thus, the skirt ring of the flexible seal ring will move relatively upward. When the displacement makes the skirt ring open, hot steam in the pot will release out through the pressure release notches to lower the steam pressure. Under the action of the elastic force of the elastic cover flange of the pot cover and the elastic pot flange of the outer pot, the pot cover will automatically restore. The turning handle is hollow and is fixed on the top surface of the pot cover to stretch from the pot cover center to a periphery, with a total length slightly larger than a pot cover radius. In the inner chamber, a hollow turning handle is provided for a forced pressure release steam exhaust mechanism, which further comprises a lever mechanism for opening a steam exhaust slide valve, and a button cam mechanism to drive the lever in motion. A pot cover positioning and locking mechanism is provided in the turning handle. The pot cover positioning and locking mechanism is composed of an elastic protrusion head fixed at the horizontal lever terminal, which is able to bounce in a turning handle bottom plate through hole, and a spring to always keep the horizontal lever tail in a downward moving trend, as well as the horizontal lever itself. A steam exhaust slide valve is in the turning handle body at the central portion of pot cover. The steam exhaust slide valve intercommunicates the pot body inside with the outside atmosphere. The steam exhaust slide valve further comprises a slide valve sleeve fixedly connected into an integral unit with the pot cover top surface and a slide valve core able to make axial bouncing in the slide valve sleeve. The fore end of the lever mechanism horizontal lever pierces through the valve sleeve and can poke the slide valve core inside it. In the slide valve core are disposed a vertical passage and a horizontal transverse passage located below its lower portion, both of which form a passage to intercommunicate the pot inside pressure with the outside atmosphere. The lever mechanism further comprises a horizontal lever, a hinge support device for hanging the horizontal lever, a button cam mechanism to drive the lever to make it poke the slide valve core downward for carrying on pressure release and steam exhaust, a spring to keep the lever fore end always in a raising upward trend, and a pot cover positioning elastic protrusion head located at the lever tail to always keep a protruding downward trend. The button cam mechanism further comprises a planar cam fixedly connected into an integral unit with the button, which always keeps an elastic pressure connection with the horizontal lever fore sectio
Qian Anguo
Tang Chunde
Alexander Reginald L.
Ningbo Tang Ren Cooker Ware Co., Ltd.
Rabin & Champagne, P.C.
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