Abstract: A gas flowrate control device for turning the flame adjustment wheel of a gas burner is disclosed to include a control wheel, which has an internal gear meshed with the flame adjustment wheel of the gas burner, a big gear surrounding the internal gear, and two small gears respectively formed integral with two sides of the big gear and surrounding the internal gear, and a handle, which has a grip and two arched clamping arms symmetrically extending from the grip and clamped on the control wheel, each arched clamping arm having two toothed arm positions respectively meshed with the two small gears of the control wheel and a crevice defined between the two arm portions for accommodating the big gear.

Abstract: A gas powered heating tool comprises a handle and a head which comprises a soldering tool element. Gas from a reservoir in the handle is delivered through a gas supply pipe to a combustion chamber where it is converted to heat by a catalytic heating element for heating the tool element. A nozzle orifice in a nozzle delivers a jet of gas through the gas supply pipe. The gas supply pipe conducts heat from the combustion chamber to a heat transfer member which in turn conducts heat to the nozzle to prevent freezing of gas in the nozzle orifice. Heat is also conducted to gas supply control means in the handle to prevent gas freezing.

Abstract: A device for photoelectrically starting and stopping the operation of a bunsen burner in response to the shadow of an operator's hand holding an object to be heated includes a solenoid valve in a line supplying gas to the burner and electronic control circuitry having secondary and primary photoelectric cells arranged in a differential response circuit. Changes in the intensity of the ambient light are cancelled by the differential response circuit, while a hand shadow, which affects only the primary cell, triggers the solenoid valve, via a gate circuit and solenoid switch.

Abstract: A gas heated soldering iron comprises a soldering head having a chamber into which a gas/air mixture is fed by means of a bunsen tube to burn as a small, very hot flame. The chamber is surrounded by a flame suppression gauze which protects the flame and prevents any combustible gases outside the chamber being ignited. Gas is supplied to the bunsen tube from a fine jet to which the gas is fed at low pressure. The low pressure is regulated by a valve operating mechanism which cooperates with the depressible valve of a disposable gas canister to form a differential valve. The canister serves as a handle for the soldering iron, and is insulated from the soldering head.

Abstract: A device for electrically starting and stopping the operation of a gas burner in response to the shadow of the user's hand holding an object to be heated, the device including a solenoid valve in the gas line and a dimmer circuit with a directional photoelectric sensor, a switching amplifier, and a valve relay controlling the solenoid valve. The dimmer circuit can be bypassed for continuous operation by means of a selector switch.