US1912798A - Safety cut-off device for gas service - Google Patents

Description

June 3 .1. A. SICKELS I 1,912,793

SAFETY CUT-OFF DEVICE FOR GAS SERVICE Filed May 51, 1930 I N VEN TOR.

A TTORNE Y.

. communicates with any suitable gas supply notshown, and 11 is a control valve for the supply pipe to which is attached a distrib- Patented June 6, 1933 :rosnrrr n. sroxELsoF KANSAS CITY, MISSOURI SAFETY GUT-OFF DEVICE FOR GAS SERVICE Application filed May 31, 1930. Serial No. 458,130.

. This invention relates to safety cut oif devicefor gas servicejand has for its principal object the provision of a thermostatic bar controlled by a flame supplied with gas from the distributing pipe which controls a-switch of an electric circuit by means of which a control valve isclosed when the thermostatic baricools due tothe cutting off ofthesupply of gas to the flam' l A further object of the present invention is the provision of a novel means for maintaining the control valve in the open position i when the electric circuit is maintained open due to the action of aflame heating a thermostatic bar.

Another object of this invention is to provide a safety cutoff device that may be positioned remote 'from the gas burner orthe control valve is controlled.

Like reference characters designate slmllar service device which consumes thegas.

With these general ob1ects n V ew as well as minor objects which Wlll appeardurlng the course of the detailedspecification, reference will now be madeto the accompanying drawing in which:

Figure 1 is a side elevation, partly broken away, of a gaslserviceequipped with a safety cut ofi device embodying this invention;

Fig, 2 is a plan view of. the parts shown -li 1.

Fig. 3 is a fragmentary sectional view taken on line III- 111 of Fig. 2; g e

. Fig. 4: is a fragmentary sectional view taken on line IV- IV of Fig. 2;

Fig. 5 is a diagrammatic view of the electric circuit by means of which the supply parts throughout the several views and the numeral 10 designates a supply pipe which utlng pipe 12. This distributingipipe conducts the gas to the burner 13 or' any other service device where the gas is consumed.

Whenever the valve 11 is in the open position the distributing pipe will befilled with gas as .long as the flow of gas in the supply pipe is not interrupted. Should the supply of gas in thesupply pipe be cut oif forany reason and the burner not supplied with gas, the flame of the burner would be extinguished and then if the supply of gas is again continued there would be danger of the escape of gas fromthe burner. This invention provides for means whereby the control valvell will be closed whenever the supply of gas to the distributing pipe is interrupted; To effect this cutting oft of the control valve a thermostatic bar 1 14 is carried on a bar 15 which isadjustably mounted at 9 on a bracket 16 which in turn clampingly engages the distributing pipe 12, Bracket 16 is secured to the distributing pipe by means of a bolt 17 which may be loosened 5 so that 16 can be rotatablyl or longitudinally adjusted thereon. The thermostatic bar 14 is shown in substantially a U-shape with its outer end normally contacting a terminal member 18 which'is carried by and insulated from the bar 15 by means of insulating members 45 and 46. Positioned adjacent thermostatic bar 14 is a perforation 19 in the distributing pipe 12 which is of suflicient size to permit the escape of gas therefrom so that 7 when lighted it will raise the temperature of the thermostatic bar sufiiciently to cause the .sameto be distorted so that its contact with the terminall8 will be broken. It is apparent thatother types of thermostatic controls might be usedin place of the bar.

. Control valve 11 consists of a body member 20 having an inletop'ening 21 which communicates with the supply pipe 10 and an outlet opening 22 which connects with the distributing pipe 12. A. valve seat 23 is positioned in 20 intermediate 21 and 23 j and is provided with a valve 24; which is adapted to cooperate therewithto control the How ofgas. from said supply pipe to' 0 said distributing pipe. Valve24 is provided with a slidably mounted valve stem 25 which is rigidly attached thereto andextends without the body member 20. An

.externally.threaded sleeve 26 fits over the' valve stem 25 and is threaded into body 7 member 20 at 27. To secure said sleeve against accidental movement relative to 20, alock nut 28 is provided. Intermediate thelower end ofsleeve 26 and the upper side of valve 24 is interposed a compres sion spring 29 which serves to normally maintain said valve in the closed position.

To maintain the valve 24 in the operative open position a nut 30 having oppositely disposed ears 31 is threaded onto the outer end of stem 25 and secured against accidental displacement by means of lock nut 32. A U-shaped member 33 having eyelets 34 at its opened ends engages ears 3-1 and extends downwardly at an angle to stem 25 so that the closed end thereof rests against the upper side of a horizontally disposed lever 35 which is pivotally mounted at 36 to a stationary plate 37 carried by body member 20. A lip 38 is formed intergral with lever 35 and serves as an abutment for 33 so that as the lever 35 is moved to the position shown in Figs. 1 and 2', 33 will securely hold the valve in the open position against the action of thespring 29. Catch 40, pivoted as at 41, has a notch 42 formed therein to engage upturned flange 43 on lever 35 when the valve parts are holding the valve 11 in open position. Coil 44, being positioned as shown in Fig. 2, causes catch 40 to release lever 35 when coil 44 is energized, whereby member 33 swings out and permits spring 29 to move stein 25 longitudinally to cut off the flow of gas through pipes 10 and 12. A stop 39 positioned on plate 37 serves to limit the out ward movement of lever 35 but will not prevent the proper closing of the valve 24.

Positioned on plate 37 is a signal light 47 and a switch 48 which will be further described.

Referring to Fig. 5, which shows a diagrammatic view of the electric circuit, 49 and 50 are the ordinary supply wires connected with a suitable electrical source not shown. A wire 51 connects wire 49 with thermostatic bar 14 and the wire 52 having a switch 48 connects the wire 50 with the signal light 47. ire 53 connects the opposite side of light 47 with coil 44 while the opposite side of coil 44 is connected with terminal 18 by means of wire 54. The flame F from distributing pipe 12 produces a suflicient heat to distort themostatic bar 14, thus causing a gap between said thermo-' static bar and terminal 18 to open the circuit. WVhen the flame F is extinguished due to the cutting off of the supply of gas to distributing pipe 12, 14'Will move downwardly and close the circuit. It will be noted that all of the electrical appliances in this circuit are in series, therefore when the circuit is closed the light 47 will be illuminated and the coil 44 will'be energized, thereby releasing lever 35 and permitting the spring 29 to close valve 24 so that, should the gas again enterthe supply pipe 10, no gas could pass into the distributing pipe 12.

It is apparent that a small burner of some special construction might be provided to communicate with perforation 19 and furnish the flame to heat the thermostatic control.

I do not wish to limit this invention to the structure shown and described as many modifications might be made within the scope of the appended claims without departing from the spirit thereof.

hat I claim is:

1. In a cut-off device for gas service a supply pipe, a distributing pipe, a vertically reciprocating control valve operable to regulate the flow of gas from said supply pipe to said distributing pipe, a burner communicating with said distributing pipe,,an auxiliary burner remotely positioned relative to said first named burner communicating with said distributing pipe, a thermostat responsive to the heat of said auxiliary burner, means for releasably holding said control valve in the open position mounted for independent swinging movement on the upper end of said valve, and electrically controlled means controlled by said thermostat operable to release said releasable holding means to permit the closing of said control valve when the flow of gas in said distributing pipe is interruptedand said auxiliary burner no longer heats said thermostat.

2. In a cut-off "for gas service, a supply pipe, a distributing pipe, a burner communicating with said distributing pipe, and a control valve interconnecting said supply pipe and the distributing pipe, said control valve being operable to control the flow of ing pipe and comprising a vertically reciprocating stein, a spring tending to maintain the valve closed, a member swingably mounted at its one end to said stem, a releasable lever pivotally supported for horizontal movement toward and from said stem, said lever engaging the free end of said swingable member to hold the control valve open an auxiliary burner in communication with said distributing pipe, and thermostatically operated means to releasably holdthe said lever in such position responsive to the heat of said auxiliary burner in eluding a catch and means to release said catch when the said thermostat is in the predetermined position.

3. In a cut-off for gas service, a supply pipe, a distributing pipe, a main burner and an auxiliary burner in communication with said: distributing pipe, a thermostatic switch responsive to the heat of said auxiliary burner, an electromagnetic coil energized by the closing of said switch, and a control valve interconnecting said supply pipe and distributing pipe comprising a vertically disposed, longitudinally reciprocating valve stem, a spring to urge said valve stem toward closed position, a depending member swingably mounted at its one end to said stem, a releasable lever pivotally supported for horizontal movement toward and from said stem to engage the free end of said depending member, and a catch movable by said coil to release said lever from effective engagement with said depending member when said thermostatically controlled switch is closed. r

In testimony whereof, I hereunto aflix my signature.

JOSEPH A. SIOKELS.

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