Abstract: A water heater is disclosed having a heat exchanger, a main burner means for heating the heat exchanger, a standing burner, a main fuel passage means for supplying fuel to the main burner, a manual valve on the main fuel passage means which is operable by a manual operation member, an automatic valve disposed on the main fuel passage means at a point downstream from the manual valve, the automatic valve adapted to open in response to the pressure of a supply of water at a water pressure sensitive member, and a standing burner fuel passage means for supplying fuel to the standing burner, the standing burner fuel passage means drawing fuel from the main fuel passage means at a point in between the manual valve and the automatic valve.

Abstract: An oxygen sensing probe includes a substrate of sintered zirconia or titania, which is formed with a pair of elongate sensing elements integral with a bridging portion of the substrate, the sensing elements having rare-earth metal electrodes on opposite parallel faces thereof which terminate on the bridging portion, at which point they are connected to electrical leads.

Abstract: A water heater is disclosed having a main burner for heating a heat exchanger and a standing burner, and is also provided with an electromagnetic safety valve which is opened by a manual operation member and which is kept in its valve open condition by the electric current from a thermocouple element exposed to the standing burner and a water pressure sensitive member such that it opens in response to a supply of water to the heat exchanger (that is, the water flow is turned on). Both the electromagnetic safety valve and the water pressure sensitive valve are interposed in a fuel passage connected to the main burner. A standing burner fuel passage is connected on one end to the standing burner and is connected at its other end to a point located in between the two valves.

Abstract: A safety apparatus for shutting down a room heating device upon detecting incomplete combustion in the burner of the heating device. A detecting element is arranged to provide an output to a setting circuit. When the output changes due to a change in combustion, the circuit cuts off fuel supply. Additional circuitry is provided to vary the predetermined operation level of the circuit depending on whether a room air circulation fan is operating or not.

Abstract: A combustion detecting element is provided which comprises an element body generating an electric change which corresponds to a difference in oxygen concentration between a first surface and a second surface thereof. Catalytic electrode layers are provided on both surfaces for carrying out catalytic reaction with combustible gas and a lead wire is connected to each layer, the catalytic electrode layers being characterized in that each catalytic electrode layer has substantially different capabilities in catalytic reaction with combustible gas.

Abstract: There is provided a combustion safety apparatus where the main burner has a combustion detecting element such as an oxygen concentration cell element, and the element is arranged so that one electrode thereof is always heated by a flame of a standing burner and into an oxygen lack condition while the other electrode is heated by the main burner. When the main burner is in its complete combustion condition, there is a difference in oxygen concentration between the two electrodes and thereby there is generated an output at the element. On the other hand, when the main burner is in its incomplete combustion condition, the difference in oxygen concentration therebetween is decreased and thereby the output is lowered. In addition there is provided a safety device such as a gas safety valve or the like.

Abstract: A combustion safety arrangement in which a switch is connected in an electrical power circuit for an electromagnetic valve in a fuel passage. A combustion detecting element responds to a change of a flame caused by incomplete combustion or the like, and generates a signal or change in an electrical characteristic. The switch and the combustion detecting element are interconnected through a control circuit which has a level detector for detecting a predetermined level of the change in electrical characteristics. The arrangement is such that the switch may be opened by the predetermined level of the change in electrical characteristics. The control circuit has a time limit operation circuit so that only when the generation of the change in electrical characteristic is continued for a delayed time set by that time limit operation circuit, the switch may be opened.

Abstract: A combustion safety apparatus wherein combustion exhaust gas of a burner is arranged to be introduced into a detecting tube having a tubular oxygen concentration cell element, and a safety valve is arranged to be controlled in operation by the output of the cell element. The detecting tube is in communication at its outlet opening with a mixing tube of the foregoing burner or another burner.

Abstract: This invention relates to an infrared radiation gas burner plate of the type that a plate member composed chiefly of ceramic is provided with a large number of distributed burner holes therethrough.

Abstract: A microwave cooking device having a main body provided therein with a heating chamber adapted for receiving foodstuffs to be cooked, a magnetron for irradiating microwave energy onto the interior of the heating chamber, and an air charging and discharging fan for forcing air to charge into and out of the heating chamber, such charging and discharging occurring through an air charging opening disposed in the heating chamber, the invention characterized in that a circulation fan for circulating air within the heating chamber is provided within the heating chamber in a fashion such that said fan is connected to a shaft common to both the air charging and air discharging fan.

Abstract: A cooking gas oven of the type with a heating housing having a door on its front and a combustion chamber of forcible exhaust type disposed below the heating housing. A burner is provided in an oven main body. There is formed in the combustion chamber, an intake passage for introducing the external air from an air intake opening in an outside surface of the combustion chamber, into a position of the burner. In the passage, there is a regulating plate for flowing the air over the burner at accelerated speed.

Abstract: A door locking apparatus has a grip bar mounted on the main handle for operating a door locking bolt. The grip bar is movable forward and rearward. A pair of links are located within the handle, facing the grip bar and forming therewith an isoceles triangle, the base of which is the grip bar. The intermediate portion of each link is pivotally attached to the handle. These links are interconnected to each other at their forward end portions, and are connected at their base end portions to the grip bar, for relative movement therebetween. Consequently, the grip bar can be given a parallel motion even when the same is gripped at any portion.

Abstract: A cooking apparatus of the type that a heating chamber is provided with a heat source and a magnetron so that cooking by heat of the heat source and cooking by microwave of the magnetron can be carried out. There are provided, on the outer side of the heating chamber, a stirrer chamber and a waveguide which is in communication therewith and is disposed on the output side of the magnetron. There is provided, on the further outer side thereof, a ventilation duct which is in communication with a cooling fan. There are disposed in the ventilation duct on the upstream side and on the downstream side thereof a radiation fin of the magnetron and a windmill for driving a stirrer provided in the stirrer chamber.

Abstract: A safety arrangement for microwave ovens or similar cooking devices, in which a circuit breaking element and a main switch, which is arranged to be open in conjunction with an unlocking operation of a lock for a door, are interposed in a load circuit connecting between an electric source of power and a load. A first door switch is arranged to be closed when the door is opened and is connected to the load circuit in parallel with the load. An auxiliary switch becomes opened upon unlocking of the lock, and is connected in the load circuit on the load side of the first door switch. A second door switch becomes opened with a delayed time interval after closing of the first door switch, by opening of the door, and is connected to the load circuit on the electrical power source side of the first door switch. The door switches become operated by a door arm extending from the door.

Abstract: The present application discloses a composite cooking device of the type having a box-shaped main body provided therein with a heating chamber, a heat source such as a gas burner, a magnetron, and a cooling fan for sending air into a cooling duct, having the magnetron interposed therein, and formed between the cooking device main body and the heating chamber, a one-sided space chamber with a front operation panel and an upper area which extends from the space chamber and is in communication with the atmosphere through an exhaust opening made in the upper portion of the main body. The device includes a control means for application of a high voltage applied through a transformer, or the like, the same contained in the space chamber. The invention is characterized in that the interior of the space chamber is separated by at least one partition wall into a front chamber for containing the control means and a rear chamber for containing the high voltage element.

Abstract: A cooking device with a microwave heater and a gas heater as well as a cooling fan for the microwave heater. A first circuit operates the microwave heater and is connected to a source of electric power through a first switching circuit. A second circuit operates the gas heater and is connected to the electric source of power through a second switching circuit, as well as a switch arranged to be operated with a gas cock. A driving circuit for the cooling fan is connected to that switch so as to be parallel with a circuit connecting in series the second circuit and the second switching circuit. The switch, furthermore, has a first contact connected to the electric source of power through the first switching circuit and has a second contact connected to the source of power without passing through the first switching circuit, while being arranged to be connected to the first contact when the gas cock is closed and to the second contact when the gas cock is opened.

Abstract: An infrared gas burner plate comprising a plate member of ceramic provided with a large number of burner holes therein distributed over the entire surface thereof. The burner plate has a front surface with a plurality of diamond-shaped concave portions continuously formed in the front surface. Each of the concave portions has a burner hole in the center thereof and a plurality of burner holes arranged around the center hole in an annular arrangement. Two holes are diametrically placed outside the holes in the annular arrangement.