US891761A - Automatic cut-off for liquid and gaseous fuel burners. - Google Patents

Description

No. 891,761. PATENTED JUNE 23, 1908.

V. E. CAMPBELL. AUTOMATICCUT- OFF FOR LIQUID AND GASEOUS FUEL BURNE 4 sHEETs-sHBBT 1.

APPLICATION FILED JAN.17. 1908.

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.NN NN @vi h1 exea 110.891,761. PATENTED JUNE 23, 1908. V. E. CAMPBELL.

AUTOMATIC CUT-OPF FOR LIQUID AND GASEOUS FUEL BURNERS.

APPLICATION FIL D J l E AN 17 908 4 SHEETS-SHEET 2.

annuals:

No. 891,761. PATENTED JUNE 23, 1908. V. E. CAMPBELL.

AUTOMATIC CUT-OFF FOR LIQUID AND GASEOUS FUEL BURNERS. APPLICATION FILED 3111.17. 1908.

4 SHEETS-SHEET 3.

@Z2/Z7 MZ @5% Maw-F PATENTED JUNE 23, 1908. V. E. CAMPBELL. AUTOMATIC CUT-OFI FOR LIQUID AND GASEOUS FUEL BURNBRS. Y

APPLIG TION .19

A FILED JAN 17 0B 4 SHEETS-SHEET 4.

UNiTnD STATES PATENT onnion.

VICTOR E. CAMPBELL, OF PORTLAND, ORGON, ASSIGNOR TO CAMPBELLS AUTOMATIC SAFETY GAS BURNER CO., OF PORTLAND, OREGON.

AUTOMATIC CUT-OFF FOR LIQUID AND GASEOUS FUEL BURNERS Specification of Letters Patent.

Patented rune l23, 1908.

' Application filed January 1.7, 1908. Serial No. 411,330.

. is a specification.

. This invention relates to liquid and gaseous fuel burners, and has for its princi al `object to provide means for automatica ly cutting ofi' theA flow of fuel in case the fire is extinguished, or in the event of failure to ignite the gas or gasolene after the valve has been moved to open position.

A further 0b] ect of the invention is to provide a novel form of thermostatically con- :trolled valve in which the valve is closed by a motor mechanism, the necessary energy for effecting the closing movement being stored as the valve is moved to open position.

A still further object of the invention is to construct a device of this type in which on the opening movement of the valve, energy is stored andis held under control until the valve is to-be closed.

With these and other objects in view, as

will more fully hereinafter appear, the invention consists in certain nove p struction and arrangement of parts, hereinfeatures of conafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may bemade Without departing from the s irit or sacrificing any of the advantages oi) the invention.`

In the accompanying drawings 2--Figure 1 `is a sectional'elevation of a gasolenel burner provided with a valve closing mech'anism constructed in accordance with the invention. Fig. 2k is a v detail sectional view through a portion of the motor mechanism. Fig. 3 is a transverse sectional view with the cam disk and its hub in elevation, showing the' mechanism for holding the motor spring wound, the parts being illustrated in the position assumed when the valve is closed. Fig. 4 is a similar view, `showing the position of the parts with the valveopen. Fig. 5 is a sectional plan view through the burner head'.

Fig. 6 is a viewcorrespondingto-Fi 1- illus- 0 ig. 7 is a. detail sectional view of a portion of. themechtrating a modified construction.

anism shown in Fig. 6. Fig. 8 is a trans'- verse sectional view on the line 8-8 of Fig. 6. Fig. 9 is a similar view on the line 9 9 of Fig. 6. Fig. 10 is a transverse section on the line 10-10 of Fig. 6. Figs. 11 and 12 are detail perspective views of the releasing lever which receives motion from the thermostat element.-

Similar numerals of reference are employed to indicate corresponding parts throughoutthe several figures of the drawings. Y

The present invention may be used in connection with any type of -uid burner, and, in the resent instanceis shown as a plied to the urner 10 of an ordinary form o gasolene stove. The burner is provided With a su ply or stand pipe 11 through whichv the gasolene passes to the burner head, and is there vaporized, the vapor passing through a pipe 12, and being under the control of a main valve 13. The burner is, also, rovided with an ordinary form of needle va ve 14, which controls thevliow of gas through the burner oriiice or passes through a mixing tube 15.

The valve 13 is carried by or forms a part of a rod 16 and the outer end of the rod is provided with a handle 17 of the ordinary type, the turning, of this handle serving to open and close the valve, so that the device may be manually operated in precisely the same manner as any ordinary form of gasolene burner. -Mounted on the valve rod is a post 20, the upper portion of which is grooved or slotted and to the rear face of the post is secured a coupling nipple 2,2, The nipple is internally threaded for the rece tion of a thermostat tube 23 that preferab y is formed of brass. This tube extends through a sleeve 24 that is carried by a block 25, the latter being secured within vthe burner head by screws or similar fastenings 26.

' Theinner end of the tube is closed, and

through said tube .extends a rod or Wire`2`8 which in practice is formed of steel or iron,

the tube and rod being formed ofme'tals havl.ses

It lisfound iii/practice that the entire rod need not be formed of steel or iron, inasmuch as the necessary movement may be secured by a rod of much shorter length. The inner end only ofthe rod, therefore, is formed of steel, While the outer portion is of brass or of the same metal as that of which the tube'i's constructed.

Secured to the opposite sides of the post 20 are two disks 32 and 33, and tothe outer loi' these disks is secured an' approximately hemi-sphe'rical casing 34, whichconceals the motor mechanism, the central portion of the casing being rovided with an opening for the passa e o? the valve carrying stem 16. Mounted oosely` on the valve stem 16 is a cylindrical hub 35 of a cam disk 36, and from the outer end of the hub projects a pin 37 which is connected to a pin .38 on the stem 16 by a helical torsion s ring 38', the connections being so arrange that when the stemis turned in the direction indicated by the arrow, Fig. 3, for the pur ose of moving the valve to o en position, t e movement of the stem will e transmitted to the hub and cam throughl the spring 38. The hub 35 serves,

also, as a spring vwindin barrel, and is provided with a hook 40.0 the usual type for connection to the innerfend of a spiral sprin 41, the outer end of said spring being secure to a post 42 that projects from thedisk 33, and as the stem is turned in the direction indicated by .the arrow in Fig. 3, the spring will be wound and placed under stress.

.Pivoted on a pin 43 that pro'ects from the disk 33 is a lever 44 that is ent into a proximately semi-circular form, and' att e.

pivot end ofnsaid lever are two opposi'tely acing tongues 45 and 46, the tongue 45 being arranged .to enter a recess 47 formed in the cam disk 36 when the parts assume the position shown in Fig. 4, and the tongue 46 being arranged to engage a shoulder 48 that is formed on the periphery of the cam disk when the parts assume the position shown in Fig. 3, this latter being the normal position when the valve is closed.

The upper end of the lever is slightly curved to form a lockin shoulder 50 that is arranged to be engage by an anti-friction roller 51` carried by a awl 52 that is pivoted on a pin 53 carriedl by the disk 33. This pawl 1s under 'the control of the thermostat and isheld in elevated'idle position when the stove is cold.

Arranged within the slotted portion `oi the post 2O is a lever 62A which preferably is ormed of stamped sheet metal, and the upper portion of this lever is provided witha pair of parallel slots, Vthe metal at the 'slit portion eingl bent in opposite directions vin order to form an opening for the passage of a short shaft or pin 63 on which said leveris ivotally mounted. The lower end of this ever engages with a bell crank lever 64 of the construction best shown in Fig. 12.

. This lever is formed of stamped sheet'metal and longer arm of th'e lever 64 extends outward through an opening formed in the disk 33 and normally rests in a position under the pawl52. 'y

The upper end of the lever 62 is'engaged by a thermostat rod 28, and as 'the atter is moved outward away ,from the burner, this movement will be transmitted Yfrom the lever 62 to the bell cranklever 64, and the latter in turn will operate the pawl 52, raisin said pawl from engagement ywiththe shoul er 50 of the locking lever 44 when the parts are in the positionI shown in Fig. 4, so that the motor spring'may be allowed to unwind for the purpose oft-turning Vthe cam disk, and its hub, back to the" osition shown in Fig. 3, and thus effect closingpf the valve.

When the valveistem is turned to .open position, the cam Adisk 36 will be turned around to the position shownin Fig. 4, and ythe tongue 45 will ride into the recess 47 ofthe cam, thereb moving the upper end-of the lever 44 inwardy to the position show-n in Fig. 4, and when the burner is heated and the thermostat operated, the lever 64 will descend to a suHicient extent to allow the pawl 52 to move to the locking position, as indicated in Fig. 4.- The parts remain in this position vuntil the burner becomes cold through extinguishing the flame, and then the pawl 52 is raised in order to allow the s ring to expand andturn the valve stem to t e closed position, as pre# viouslyv described.

As the hub 35 is .turned in closing the valve, the valve closing movement is assisted through the sprin 38 and the adjustment of the parts is such t at the valve is brought to its seat by the main spring 41 before the stem 16 has completed its rotation, thereby closing the valve firmly, but at the same timethe spring 38 o erates to prevent jamming of the valve and ama 'e to the' contacting portions of the valve an its seat.

The apparatus as described, operates to j employed.

Mounted loosely on the valverod 16'- is a sleeve 55 from which extends a pin 56 that is arranged parallel with the va ve rod, andv projecting from .the latter isaJ pin 57 which 180 engages with the pin 56 and revolves the sleeve. each time the valve is moved to open position. Mounted on the sleeve is a strong spiral spring 41', the inner end of which is secured to the sleeve, while the outer end of the spring is secured to a pin 42 that projects from the innermost disk L), this pin extending through and serving as a support for a guard disk (i0 which, in connection with a smaller guard disk 61, serves to protectv the sleeve, this construction being common to both devices. 'I

The sleeve carries a large gear wheel 62 which meshes with a pinion 63 on a shaft 64. The shaft 64 carries a fixed ratchet wheel 65 with which engages a wheel (57 on the shaft. The wheel 67 is connected through a train vof gearing to an escapementfwheel arbor 68', carrying an escapement G9 with which engages an anchor/ escapement 7() that is provided with a weight 71 'in order to retard its operation. The anchor is mounted in suitable bearings, one of 'which is formed of a suitable bridge 72 secured to the outer' disk 33. Bearing on the escapemei-it wheel is a locking member 52 that is held down in locked position by a' spring 74a, and the locking member is under the control of the lever 64 which is actuated by the thermostat inthe same. manner as in the construction shown in Figs. 1 yand 2.

The apparatus may be employed to advantage in connection with any form of burner and with any fuel, the type of controllingr device being modified to suit the particular fuel being used'.

I claim:--

1. rl`he combination with a burner head 5 of a controlling valve arranged below the burner head, a revoluble rod carrying the valve, a post mounted on the rod, a thermostat extending from the burner to the post., a lnotor mechanism supported by the post and connected to the valve rod, a motor locking device, and means carried by the post for connecting the thermostat to said locking device.

2. 'lhe combination with a burner head; of a valvearranged below the burner head, a post mounted upon the valve rod, a spring motor supported by the post, means for transmitting movement from the rod to -the, spring and placing the latter under'stress when the valve is moved -to open position, a motor locking device, and a thermostat connected to said locking dev'ee, the thermostat extending from the burner head to the mst.

3. rlhe combination with a burner liead and a cont-rolling valve, of a post mounted on the valve rod, a. spring motor supported by said post, means for connecting the motor spring to the rod to store energy in the spring when the valve is moved to open position, a motor locking device, a. thermostat extending from the burner head to the jpost, and a Vipiiii`1""ofi1levers mounted in Kthe post and a1'- ranged to transmit movement fromthe thermostat to the locking device.

4. The combination with a burner head and a controlling valve', of a rod carrying the valve, said rod. being free to be moved to open and closed positions by hand, a post carried by the rod, 'the upper portion of the post being hollow, a spring motor, the spring being placed under stress during the opening movement of the valve, a motor locking device, a pair of levers arranged inthe hollow portion of the post, the lowermost lever being connected to the locking device', and a thermostat extending fromthe burner head to the post and arranged to transmit movement tothe upper lever.

5. The combination with a burner, of a controlling valve, a revoluble valve rod, a motor spring arranged to be placed under stress when the rod is turned to move the valve to open position, a motorlocking device, a thermostat for moving the locking device to release position, and a yieldable connection between the motor and the rod to prevent the exercise of undue force on the rod in seating the valve.

6. The combination with a burner, of a fuel controlling valve, a rod for operating the valve, a lmb mounted loosely on the rod, a 'torsion spring connecting the hub and rod, a motor spring extending between the hub and a fixed point, said motor being placed under stress when the rod is turned in moving the valve to open position, means fer locking the f motor spring, and a thermostat for movingr the locking device to release position.

7. In combination, a burner, a fuel controlling valve therefor, a rod connected to the valve, the hub having a yieldable connection with the rod, a cam disk carried by the rod and provided with a locking shoulder and a locking notch, a motor spring extending between the hub and a fiXed point, said spring being placed under stress when the rod is turned in moving the valve to open position, a cam disk engaging lever having a pair of oppositely directed tongues, one of which is arranged to enter the notch when the spring is Wound, and the other of which is arranged to engage the locking shoulder ot' the disk to limit unwinding movement of the spring, a pawl arranged to engage said lever, and a thermostat for moving said pawl to release position- 8. The combination with a li uid fuel burner, of a fluid controlling valve t ierefor, a rod connected to the valve, a hub having a vieldable connection withthe rod, a cam disk carried by the hub and provided with a locking notch and a locking shoulder, a pivoted lever having ,a pair of oppositely directed tongues, one arranged to enter the notch and 'the other to engage the shoulder of the disk, a pivotally mounted paWl, a roller carried thereby aud arranged to engage the lever, and a thermostat for moving said pawl to release position.

9. The combination with a burner including a burner head and controlling valve, of a revoluble valve carrying rod, a hollow post supported by the rod and provided with a projecting nipple, a spring motor mechanism arranged tobe placed under stress by the turning ol the rod during movement of the valve to open position, a locking device for the motor, a tube extending from the nipple to the burner head, a rod eXtendinO through the tube, the rod and tube being iormed ol metals having dilierent coefiicients of eXpansion, and means within the post for transmitting movement from the end of the rod to the locking devices.

10. The combinationl with a burner including a burner head and controlling valve ol a revoluble valve carrying rod, a'hollow post supported by the rod, .a spring motor mechanism by which the spring is placed under stress during the turning ofthe rod to open the valve, a motor locking device, a thermostat extending from the burner head to the post, a bell crank lever mounted inthe lower portion of the post and having its approximately horizontal arm connected to the locking device, and ka second lever alsoarranged within tlie post, the upper end of said second lever being engaged by the thermo-l stat and its lower end engaging said bell crank lever.

11. In combination a valve, a motor, device in which potential energy is stored by the movement of the Valve to open position,

an elasticA connection between the motor device and the valve and disposed to be placed under stress by the movement of the valve to open position and to be liberated upon the completion of such movement, means for locking the motordevice to prevent its operating to return the valve to closed osition, and a thermostat for releasing sai locking device.

12. In combination a valve, "a motor in which the potential energy is stored .bythe an elasticconnection between the motor and valve and disposed to be placed under stress tion and to be liberated upon the completion of such movement.

and a controlling valve; of a spring motor, an elastic connection between the motor and the valve and disposed to be placed under stress by the movement of the valve to open position and to be liberated upon the completion of such movement, a motor locking device, a thermostat extending into the burner head, and means actuated by the thermostat for shifting the motor locking device out of engaging position.

14E.l The combination with a burner head and a controllinor valve of a motor for actuating the valve, a cam disk revoluble with the motor, a cam engaging lever for holding the motor against rotation in one direction, a pawl cooperating therewith, a bell crank lever mounted adjacent and disposed to lift the pawl, a tl'iermostatextendin into and beyond the burner head, and a liever operated by the thermostat for actuating the bellcrank lever. In testimony that I claim the` foregoing as my own, I have hereto aliXed my signature in the presence of two witnesses.

VICTOR E. CAMPBELL.

Witnesses:

FRED. W. SNYDER, ANNA SNYDER.

by the movement of the valve toopen posi- 13. The combinationwith a burner head movement of the valve to open position, and

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