US1453079A

US1453079A - Safety valve

Info

Publication number: US1453079A
Application number: US325206A
Authority: US
Inventors: Robert E Newell
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-09-20
Filing date: 1919-09-20
Publication date: 1923-04-24
Anticipated expiration: 1940-04-24

Description

Apr. 24, 1923.

- R. E. NEWELL SAFETY VALVE Filed Sept. 1919- WETNEBSES ping position but is prevented from Patented Apr. 24, 1923.

UNITE. STATES PATENT orrice.

nonnnm a. NEWELL, or IRWIN, PENNSYLVANIA.

SAFETY VALVE.

Application filed September 20,. 1919. Serial No. 325,206.

To all whom it may concern:

Be it known that I, ROBERT E. NEWELL, a citizen of the United States, and a resident of Irwin, in the county of VVestmoreland and State ofv Pennsylvania, have made a new and useful Invention in Safety Valves, of whichthe following is a specification.

- My invention'relates to safety valves for gas burners and consists of a device which 1 automatically closes the burner supply valve whenever the burner flame is extinguished as by wind, atmospheric. concussion, interruption in pressure or other cause.

My device utilizes a thermostatic member for controllin the supply valve and one of i the objects 0 my invention is to space the thermostatic member from the burner flame so that the metal in the thermostat will not be subjected to continuous exposure to the 9 burner flame yet will be controlled thereby. Another object is to concentrate some of the burner'heat on the thermostat when the gas is ignited so as to make the. thermostat quickly responsive to the ignition. Another.

object is'to enable the spacing of the valve and burner from each other without affecting the efficiency of the automatic features of the device.

Briefl the device comprises a valve in which t e plug is normally held in closed position b a spring. A band surrounds a portion 0 the plug and is adapted to grip the latter to hold it in any desired position. A flat spring tends to hold this band in gripunctioning by a thermostatic member except when the latter is heated. Manual turning of the plug to open position accompanied by application "of heat to the thermostatic member results in an automatic gripping of the plug in open position. Subsequent cessation of the heat causes the thermostat to release the gripping means, whereupon the plu returns toits closed position.

I l 1e detailed description of my device is illustrated in the accompanying drawings in which Figure 1 is a vertical section and view of the valve with portions ofthestove to which it is applied and the burner controlled by it; Fig. 2 is a front view and partial section of the same; Fig. 3 is a section on line 3--3 of Fig. 1 and Fig. 4 is a section on line 4-4: of Fig. 1.

I have shown the device as applied to the side 1 of a gas heater and controlling the burner 2. Those parts which project outside ofthe stove are enclosed by a casing 3. The gas connection .isto the stem 4 which leads'to burner 2 thru a valve 5 provided with a plug 6. Plug 6 is operated by a handle 7 and has an integral drum 8. Drum 8 is encircled by a band 9 one end of which i is attached to a fixed pin or lug 10 located 'on the valve body; the other end is attached to one arm of a bell crank 11. This bell .crank is pivoted to the valve body at 12 and its other arm bears against a flat spring 13 which is attached to the valve body at a point removed from its contact with the bell crank. The tendency of spring 13 .is to move bell crank 11 in a clockwise .direction.

An extension 14 on the body aids in attaching the device to the heater and forms a spaced securing point for a thermostatic member 15 which is composed of a strip of metal formed of two or more alternate layers of metals having different coefficients of .expansion. The strip is turned so that the metal having the smallest coefficient of expansion is nearest spring 13. When member 15 is heated, it curves in an are indicated by the dotted lines in Fig. 1.

15 and when the latter is cold and in its nection it is possible to locate the thermostatic member and the valve independently of each other. \VhileI have shown'these parts in my preferred construction as being adjacent, it would be feasible to have the valve at a point remote from the burner and in some applications of my device such a location of the valve might be advantageous or necessary. I prefer cable 16 to be flexible which will permit it to beled around intervening parts if desired. One end of the cable is threaded and fitted with nuts to permit adjustment.

When member 15 is heated it releases its pull on spring 13 and frees the latter which A cable 16 connects spring 13 to member actuates bell crank 11 so as to tighten band fiected from its normal position, the end of shield 17 will be spaced from the nipple 18 as indicated by the dotted lines in Fig.- 4.

A washer of asbestos or other non-conducting material is inserted between shield 17 and member 15. 1

A. spiral spring 19 is attached at one end to drum 8 and at the other end to the valve body and being under initial tension tends to maintain the valve in the closed position shown in Fig. 2 with a lug 20 on the plug engaginga notch 21 on thebody. 22 represents a hole in the heater casing to permit ,iac cess to the burner;

crank 11 so as to tighten band 9 on drum 8 v and hold the latter in position. When this movement is accomplished the manual hold on the handle may be released.

It will be 'noted that the above described movement brings shield 17 to a position where it no longer deflects the heat from nipture than that necessary to maintain its dis- I tortion; The non-conducting washer inter- .ru ts the transmission of heat thru the shield to the thermostat and further protects the latter. A

When the fiame is extinguished, the cooling thermostat-15 returns to its normal position releasing the grip of band 9 on drum 8.

SpringlQ immediately returns the valve to the closed position thus stopping the how of gas. When the burner is lit, the friction of band. 9 on drum 8 will be suflicient to resist the action of'spring 19 but will-not be great enough to interfere with easy adjust= ment'of the valve opening by any person desiring to regulate the burner. This is due to the fact that after initial movement of the thermostatic member, variations in its position .do not aflect the frictional grip of band 9 because of the character of the connection between member 15 and spring 13. The thermostat has no effect upon the holding deviceexce'ptwhen the former is very near the position shown in full lines in 1.

ed to frictiona This feature has the further advantages of preventing binding of the parts involved or any undue strain onsame which exists in those devices which continued movement of a thermostatic member is accompanied by Increased friction or pressure by the member it controls.

'I claim v 1. In combination with a fuel burner, a valve, a thermostat controlling said valve and a shield adapted to concentrate the heat of said burner on said thermostat until the latter is heated and then to move with said thermostat to a position where said thermostat will be heated by radiation only.

2. In combination'with a fuel burner, a thermostatic member spaced from the burner flame, a shield integral with said member and adapted to overspan the space between said member and said flame when said member is cool so as to deflect the heat from said flame to said member, but to reach short of said flame when said member is heat. i

3. In an automatic safety valve for fuel burners, a valve plug, a band encircling said plug and thermostatically controlled means adapted to tighten said band upon said plug when the fuel supplied by said valve is burning.

4. In a safet 1 valve for fuel burners, a valve plug, a rum operating therewith, a bandencirclin said drum and means adaptfiy engage or to disengage said band and said drum.

5. In a safety valve for fuel burners, a valve plug, a drum operating therewith, a band encircling said drum and thermostatically controlled means adapted to friction-' ally engage or to disengage said band and said drum.

6. An automatic safety device for fuel burnerscomprising a valve, 9. spring adapted to maintain said valve in closed position, a band about said valve, a thermostatic strip adapted to be heated by-the burner, supplied thru said valve, means for tightening said band about said valve and a connectionbetween said means and said strip whereby saidstrip ,normally holds said means in an inoperative position but when heated permits said means to operate to prevent said spring from functioning as described.

7. In combination with a burner, a supply valve for controlling the delivery of fuel to said burner, means for yieldingly holding the valve closed, an element for frictionally engaging the valve and holding it in set open positions, a spring tending to hold said element in engagement with said valve,

and a thermostatic element responsive to distorted by 8. In combination with a burner, e valve for,

eqmiellin the delivery of fuel thereto, means for centre iin the epereeion of said valve. thermostatic e ement responsive to heat generated by the burner, for controlling the opemtion of said means, and a, deflectei' moveble with izhe element'ffor decreasing the direet heat delivered to the element when the element mevw in i'esponseto increasing heat.

9. In cembinetien with a burner, a valve for eentreiling the delivery of fuel thereto, meens fer controlling the eperetion ef the heat valve, a thermestatic element responsive to aerated by the burner, and controlling t 0 operation of said means, and a deilector for directing heat from the burner to said element and movable in response to increasing heat-to reduce the amount of heat so directed.

In testimen whereof, have hereimte subscribed my and this 193; day of September, eis.

RGBERT E. NEWELL.