Fluid handling – Systems – With flow control means for branched passages
Reexamination Certificate
2000-03-27
2001-04-10
Fox, John (Department: 3753)
Fluid handling
Systems
With flow control means for branched passages
C137S066000
Reexamination Certificate
active
06213152
ABSTRACT:
The present invention relates to the installation and configuration of a burner combustion safety valve on a gas cooking hob, as well as to the body of the safety valve operated by electromagnet.
PRIOR ART
Cooking hob gas taps manually regulated by means of a rotary control having no flame safety valve are already known. A second type of tap for gas cookers has a built-in thermoelectric safety valve, which has to be reset initially for ignition by pressing the tap regulation shaft by hand until the flame detector thermocouple generates an e.m.f. to keep the valve open. This latter tap body is more complex because the safety valve housing has a shape and position interrelated with the shaft thrust mechanism.
On cooking hobs already installed that do not have a safety valve, the addition of a safety device is required without replacement of the manual tap. These taps are installed in line in the appliance on a rigid gas supply rail with a separation distance of 50 mm between the tap spindles. An individual rigid pipe runs from each pipe to a burner.
EP-790467 shows a safety valve for protecting a gas cooking hob, which cuts off the main gas supply to the cooker in case of gas leakage or a fault in the cooking hob, and is installed away from the appliance between the gas source and a flex hose supplying gas to the appliance.
DE-3818859 shows a safety device, which is a shut-off valve with two coaxial gas supply ducts, and between them two valve seats operated by the respective stem of a control device, mounted transversely to the two ducts.
DISCLOSURE OF THE INVENTION
The object of the invention is a safety gas valve arrangement for a cooking hob, provided with a valve body intercalated in the appliance between a manual regulating tap and the respective burner gas pipe, as defined in the claims.
The safety valve arrangement according to the invention provides a safety solution against the absence of a flame for cooking hobs currently in operation, wherein the present taps only incorporate a manually turned taper valve sealing member. The body of the safety valve does not require replacement of the rigid burner pipes as it is connected between the manual tap and the burner, occupying the free space already existing in the cooking hob. It also provides a solution for the installation of new cooking hobs, with no need for a tap with a built-in safety valve and manual resetting, as the safety valve according to the invention is operated by an electromagnet assembly, the winding of which is supplied from a DC voltage source. The safety valve electromagnet assembly maintains the size of the miniature thermoelectric magnet assembly that is usually fitted to safety valves operated by means of manual pressure.
REFERENCES:
patent: 1775980 (1930-09-01), Walbridge
patent: 4491142 (1985-01-01), Shimizu
patent: 5094259 (1992-03-01), Hsu
Fagor S. Coop.
Fox John
The Kline Law Firm
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