US1687358A - Gas burner with automatically-controlled safety valve - Google Patents

Description

Oct.` 9, 192s. 1,687,358y

H. BACH GAS BURNER WI'VIH AUTOMATICALLY CONTROLLED SAFETY VALVE Filed April 29, '1927' Patented ct. 9, 192,8.

HENRIK BACH, OF DISIOSANMARTIN, TRAIN'SYLVANILA, RUMANIA.k

GAS BURNER WITH AUTOMATICALLY-CONTROLLED SAFETY VALVE.

Application 1ed April 29, 1927. Serial No. 187,610.

This invention relates to gas burners with safety device automatically controlled by the flame of the burner.

'lhe object of this invention is to provide a safety gas burner for industrial and domestic gas appliances, which is so constructed that if the llame of the burner should ever gol l out for any reason,

the gas supply to the burner is automatically shut oil'. ltI will be appreciated that in domestic stoves or in industrial furnaces the flame of the burner sometimes goes out in consequence of freezing of regulators, or sudden drop of the gas pressure, of strong draught through the chimney and other reasons. Consequently when the cause of the sudden shut oil' is eliminated and the gas again iiows unchecked to the burner and discharges freely in the stove or furnace, or even in the room without being ignited, the stove, furnace or room will be lilled with explosive gas mixture which not infrequently results in explosion.

By means'of this invention, the gas burner ill be immediately and automatically shut oll' it' the flame of the burner blows out and prevents the uncontrolled flowing out of the fuel. The working of this safety device is absolutely sure as its principle is based on common physical law, i. e. the expansion of metals under the change of temperature.

This safety gas burner is appliable to any form or size of apparatus, stove, lamps, furnaces, boilers, etc.

The accompanying drawing is a longitudinal section of a burner embodying my invention.

The device consists of a tubular casing l substantiallyA one half of Which constitutes a burner head 2 to be placed in the stove or furnace. One end of the casing is threaded for connection to the gas supply pipe or main by an ordinary valve coupling not shown. The burner head portion 2 has a series of longitudinal slots 3 therein constituting flame oriices behind which is mounted a plate 4 forming a combustion chamber 5 into which gas mixed with air from the tube 1 enters through perforations 6 in said plate.

A thermostatic member 7 consisting of' a length of nickel wire is clamped at one end between screws 8 in the head 9 ofthe casing, and extends centrally through the combustion chamber 5 and through the end wall of the latter into the casing.

The threaded end of the casing 1 which is to be connected to the gas main, contains a concentrically mounted valve chamber 10 formed with an internal annular flange ll constituting al seat for a valve 12, carried by a valve stem 13 slidable and axially mounted in the inner end 14 of valve chamber 10. ln the outer end of the latter is mounted a plate lll having a series of apertures l5 for the advmissionfof gas from the gas main imo the valve chamber 10, and projecting axially through the plate 14 is a pin '1U forming a'n extension of the valve stem 13 on the underside of the valve. Surrounding the pin LU between the plate 14 and valve 12 is a coiled spring 17 adapted to yieldingly hold the valve 12 on its seat l1.

ln the inner end of the valve chamber. 10 near the periphery of the latter is mounted a gas discharge nozzle 18 and adjacent the latter in the wall of the casing 1 .is formed a large air inlet opening 19 for supplying outside airto the gas as it leaves the nozzle 18.

On the inner end ot' the valve stem l13 is mounted an arm 2() which extends laterally through a longitudinal slot in thefcasing 1. Said arm carries a slide plate 21 which covers the slot and has a knob 22 on its outer end.v By moving the knob in the direction of the arrow said arm operates to depress the stein 13 against the action of spring 17 thereby unseating the valve 12 allowing gas to be discharged through nozzle 18 into the casing 1, where the gas mixes with air entering aperture 19 and flows into the combustion chamloer 5 through the apertun-s 6 and is ignited.

Flames which issue through the slots 3 also heat the expansible member 7 The movable end 23 of the member 7 is pivotally connected.

to the short arm 24 of a bell-crank lever which is pivoted on a bracket 25 secured inside the casing 1.

The long arm 26 of the bell-crank lever extends through and is movable in an aperture 27 formed inthe lateral arm 2() and the free end of said arm 26 has a hook 28 formed thereon adapted to engage a notch 29 formed in the side of the valve stem 13.

A spring 30 surrounding the pivot of the bell-crank lever has one end bearing on the bracket 25 while the other end is held tensioned against the long arm 26 of the lever so that the latter has a tendency to move its hooked end'28 towards the' valve stem 13.

After the valve 12 has been moved from its seat as described above, and the gas in the combustion chamber is ignited, it is necessary to hold the valve in open position for only a very short while, about thirty seconds, for as soon as the member 7 becomes heated it expands longitudinally and allows the spring 30 to function thereby shifting the long-arm 26 of the lever to the left from the position shown in the drawing until the hook 28 engages the notch 29 and holds the stem 13 depressed.

The spring 30 is not essential to the operation above described as the expansion of member 7 will through the connection of the latter with the short arm 24 cause the long arm to swing into locking position with the spindle.

Should the burner become extinguished for any reason, the member 7 will quickly cool and contract causing the levers to swing in the opposite direction thereby withdrawing the hook 28 from notch 29 releasing the spindle so that the valve 12 will be seated by the spring 17 thus shutting off the supply of gas through nozzle 18.

I claim- 1. A gas burner comprising a tubular casing for connection to a gas supply pipe and having flame orifices and an air inlet, a combustion chamber formed in said casing behind the orifices, a gas supply nozzle opening into said casing adjacent the inlet, a spring urged valve having a stem and conf trolling the admission of gas to the nozzle, means to manually operate the valve, a .thermostatic 'member fixed at one end in the Casing and extending through the combustion chamber, a bell-crank lever pivoted in the casing having a short arm pivoted to the movable end of the thermostatic member and a long arm extending longitudinally ofthe casing adapted to be moved automatically into and out of locking engagement with the stem 0f the valve by the expansion and contraction respectively of the thermostatic member.

2. A gas burner comprising a tubular housing, for connection to a gas supply pipe and having fiame orifices and an air inlet, a combustion chamber formed in the housin behind the orifices, a valve casing in the ousing, a valve in the casing controlling an outlet port formed in thelatter, a stem carrying the valve arranged axially of the casing reciprocally mounted therein, a notch formed in the valve stem outside the casing, a gas supply nozzle communicating, with the housing and casing above the valve, a slide outside the housing connected with the valve stem, a spring in the valve casing normally closing the valve, a bell-crank lever pivoted in the housing having one arm extending longitudinally of the latter and having a hooked end adapted to engage the notch in the valve stem, and a thermostatic wire fixed in the housing at one end and extending through the combustion chamber and having its movable end pivotally connected to the short arm of said lever.

In testimony whereof I have signed my name to this specification.

HENRIK BACH.

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