An Improved Device for Gas Burners and the like for Preventing the Escape of Unburnt Gas

18,364. Huttenlocher, F. Aug. 20, 1910, [Convention date]. Valves controlled from a distance; actuating. -Relates to an automatic cut-off device for gas-burners to prevent the escape of unburnt gas on omission to ignite the gas or on the flame being extinguished without the gas-cock being closed. The device comprises a bell 4, Fig. 1, or the like, disposed on the supply side of the usual gas-cock 1. In operation to light the gas, the bell is first lifted by hand to obtain a charge of gas from the supply-pipe 3; the cock 1 is then opened. If the gas is not ignited at the burner very shortly thereafter, the escape of gas at the burner causes the bell to fall and close the inlet pipe 3. If the gas is lit opportunely, a pin 10 carried by a diaphragm is moved to intercept the pin 6 on the bell and hold the bell in the raised position. The diaphragm is moved by the expansion of air confined in a small chamber at the burner. Modifications are described in which the closure parts 3, 11 are replaced by liquid-seal members, and in which the device is placed between the usual gas-cock and the burner. Fig. 9 shows one liquid-seal arrangement in which the bell is raised initially by a forked lever 20 in engagement with a pin 21 in opposition to the load 23 on the detent-lever 24.