US2641314A - Douvan - Google Patents

Description

B. DOUVAN AUTOMATIC CUTOFF VALVE FOR FUEL BURNERS June 9, 1953 2 Sheets-Sheet 1 Filed Jan. 7, 19 50 INVENTOR. A 502/5 DOUVA/V FIG.4

ATTORNEYS June 9, 1953 B. DOUVAN 2,641,314

AUTOMATIC CUTOFF VALVE FOR FUEL BURNERS.

Filed Jan. '7, 1950 2 Sheets-Sheet 2 5| FIG. 6

IN VEN TOR. 502/5 0 o u VAN BY v M JM MM ATTORNEYS Patented June 9, 1953 AUTOMATIC oU'ToFF VALVE FOR FUEL BURNERS Boris Douvan, Bayonne, N. J., essig'nor of onehalf 'to George J. Kupchik, New York, N. Y.

Application January 7, 1950, serial No. 1314i:

'10 Claims.

The present invention relates to an automatic cut ofi valve for fluid fuel burners, and mo e particularly to a valve for gas burners which will "close automatically if the burner fails to become ignited after the fuel feed conduit has been manually opened or if the flame is ex= tinguisheii, but which is retained in its open position by thermostatically controlled means as long as the thermostat is heated by the burner flame.

One object of the invention is to provide a cut-off valve or the ty e set forth which, after manual opening of the fuel feed conduit, will remain init's open position for a predetermined initial period regardless of the'operation of the thermostat, but which will move to its closed position at the end of theinitialperiod unless the burner has been ignited and the thermostat has been brought into operation prior to'the end of theinitial period. c I

Another object of the invention is to provide a delay-action automatie cut-off valve for fluid fuel burners which is simple in' construction and reliable in operation.

A still further objeot of the invention is to provide a cut-off valve which Can be adjusted to various open positions while the burnef is ignited and which is retained in each adjusted open position as long as the thermostat it heated by' the burner 'fiame.

According to the invention, these and othei objects which will appear more clearly as the specification proceeds are accomplished by the arrangement and combination of elements set forth in the following detailed deseription, de= fined in the appended claims t e iliust'ratively exemplified in the accompanying drawings, in hic Fig. 1 is; a sideelevational View artly in Sec tion of ne embodiment of the invention 2 is a partial section taken on line 2'2 ffii 1; I c v Fig. 3 is a partial end view of the arrange= ment shown in Fig. 1 as seen from theri'ght; v

Figs. 4 and 5 are detail views of detent ele ee Fig. 6 is a partial side elevation of a second embodiment of the inventio v Fig. 7 is an end elevational view showing parts of the arrangement according to Fig. 6 as seen from the right; I

Fig. 3 is a partial elevational view of a third embodiment of the invention; 7

Fig; 9 is a partial right-hand end view of the construction according to Fig. 8.

2 heieiiihe how to drawings and first to Figs. 1 to 5,- li is e oohtehtiohei gas burner to ithioh gaseous iiiei is fed thibiigh oohdoit la Ava1ve casing 1-3 is inserted into the eonduit i2 and Corn tains ti valve Hl 'inamiall'y adjustable by meets of a handle it. The valve In is proi/id'eti with a piojeetin'g stem 16 havin 's'weeteo there-- oh e seetet shepeo iiiso n hrotioeii with teeth IS on h rt or its hen-them -A coil spring [9 sur ounds the verve stem 16 etween the valve casing 13 the the disc n and th ehii an anchored on the "verve easing l3 and the other end ihserteo in a hole or the disc n. so as to urge the valve It to closed osition. I

A com 2! is iiioiinted loosely on the outer end of the valve steth- It tho held ih plate by a sotew 22. A second eon spring 24, Wliioh is weaker than the first toil sprite is, sii'i'rouhos the valve stem hetweeh the dish I! the the can 21 and has one tho inseited a hero iii the elite l1 'while its other end extends ihto a hole in the teih 2 1. Thus the cam ii is urged to an an g'iilai psition tottespohoihg to that or aiso n. V

The 2| has a it iseo portion 23 whioh regist'efs with hegiiihihe of the toothed iooitioii 18 or disc 11 when the cam 2| assumes its anionlai" hositioh eir'esidondine to that of dish n.

A brtehet 25 is seouiea to a hi too on the vahre easing, it? ihstehhe, by means or soiewe it. The o'yi hoer 21 or oil oath-hot is hinged to the bracket 25 While the piston 28 of the oash=pot is hii geii by means or its "piston red 29 to the cam v Pivoteti to siiiafaor't 3| seiired to t e valve casing I3 are two aetents 32 the 33,- whioh ar urged against the periphery of disc': 11 103 small springs at the 35, teshettiveiy. As can be seeh more clearly from Figs. 4 and 5 detent 32 has a downwardli hrojeetii tooth st and bei ondthe tooth a oowhweidiy beht eho hottioh 31, while detent as, whi h is also provieee with e. down wardiy bioje'etin'g tooth at; has opt/atom beht eho hoitioh 39, 'rheoetehts 32 the is angula'rlji ofi set with i espeot to oath other in suii a way that teeth 36' of detent 32 otihhot engage the toothed fioftien It or dis 11 unless the valve I4 is opento a ptedeteimihed extent, While the t oth at of deteht 3-3 can enga e the tootheo portion it of disc ii at positions of the valve I4 oo'r'reshoiioihe to a lesser opening there A brack t at amped to the conduit Ii eup= ports inside of the hotter H e bi-inetailic ther mo's'tat element 4|. The hrooket at has also piv -otoa thereto ti two-aimed lever, one en'ii' 4 2 of 3 which is engaged by the upper end of the thermostatic element 4| while the other lever arm 43 extends below the upwardly bent end 39 of the detent 33.

As shown in solid lines in Fig. 1 and in Figs. 2 and 3, all parts are in the position which they assume when the valve I4 is closed.

The device operates as follows:

When the valve I4 is opened by turning of the handle IS in counter-clockwise direction, as seen in Fig. 2, the valve return spring l9 is wound. Tooth 36 of detent 32 will engage the toothed part l8 of disc after the valve has been rotated through an angle of at least about 45. If the handle I5 is then released, the valve will be retained in its open position due to the engagement of the tooth 36 with one of the teeth |8 on disc I I against the force of spring l9 which tends to return valve l4 to its closed position.

The spring 24 tends to turn cam 2| in the same direction as disc H, but the movement of cam 2| is delayed by the retarding action of dash- pot 21, 28. In other words, the spring 24 is wound when the valve is opened and unwinds gradually as cam 2| follows the movement of disc I! with a predetermined delay. Thus, cam 2| cannot reach its operative position and the raised cam portion 23 does not pass under the downwardly bent end portion 31 of detent 32 until a predetermined initial period of about to seconds has elapsed after the opening of valve 14.

If at the end of this predetermined initial period the burnerhas not become ignited and the bimetallic thermostat 4| has not been heated, the lever 42, 43 is still in its initial position shown in solid lines in Fig. 1 and the lever arm 43 continues to keep the tooth 38 of detent 33 out of I engagement with the teeth l8 of disc II, as shown in Fig. 2. Consequently, when the raised cam portion 23 lifts the detent 32 against the force of spring 34, tooth 36 is disengaged from the toothed part |8 of disc l1 and the valve M is returned to its closed position by the valve return spring l9, whereupon the cam 2| is also gradually returned to its initial position by the spring 24.

If, however, the burner has become ignited, the bi-metallic thermostat element 4| will bend and cause a tilting of lever 42, 43 to the position shown in dot and dash lines in Fig. 1, thereby permitting the detent 33 to assume under the force of spring 35 a position in which tooth 38 engages the toothed portion |8 of disc Consequently, when detent 32 is thereafter lifted by the raised cam portion 23, the valve will be retained in its open position by the engagement of detent tooth 38 with the toothed portion N3 of disc IT.

The teeth l8 have on both sides surfaces equally inclined to a radial line passing through the tip of the tooth so that disc I! and valve l4 can be adjusted to any desired position while the tooth 38 engages the toothed portion l8 of the disc l1, and the valve M will be retained in any adjusted open position exceeding a minimum opening necessary for the proper operation of the burner by the cooperation between the tooth 38 and the toothed portion l8 of disc II.

If the burner flame after once having been ignited, becomes subsequently, extinguished for any reason while the valve is still open, the bimetallic thermostatic element 4| and lever 42,

43 will return to their initial positions shown in solid lines in Fig. 1 and the tooth 38 will be disengaged from the toothed portion l8 oi t e disc ll. The tooth 36 is then incapable of reengaging the teeth It either because it is held out of engagement with the teeth by the raised cam portion 23, if the valve is still more than 45 open and the raised cam portion 23 holds the tooth 36 away from the periphery of disc IT or because the tooth 33 is no longer opposite the toothed disc portion I8 if the valve has been adjusted to a lesser opening. Consequently, the valve will then be returned to its closed position by the spring I9 and the cam 2| will gradually follow.

In the embodiment of the invention illustrated in Figs. 6 and '7, the burner and bi-metallic thermostat are substantially similar to those shown in Fig. 1 and, for this reason, these elements are omitted from Fig. 6.

In Figs. 6 and '7, the gas conduit is designated by the reference numeral 5|. 52 is the valve casing. 53 is the valve. 54 is the control handle. 55 is the projecting valve stem. 56 is the toothed disc. 51 is the valve return spring. 58 is the cam rotatable on the valve stem 55. spring extending between the disc 56 and the cam 58. 6D and 6| are the two detents which, in this case, consist of blade springs mounted directly on the valve casing 52. 62 is the thermostat control lever arm which cooperates with the free end of detent 6|. The position of the various parts shown in full lines in Fig. 6 and in Fig. 7 corresponds to full opening of the valve and burning of the burner flame.

The arrangement according to Figs. 6 and 7 differs from that shown in Figs. 1 to 5 mainly in the omission of the dash-pot and the substitution of an escapement as delay mechanism for the cam 58. For this purpose, cam 58 is provided along part of its periphery with teeth 63 in engagement with a pinion 64 secured to a shaft 65, which latter is rotatably supported in a bracket 66 depending from the valve casing 52. A toothed wheel 3! is mounted rigidly on shaft 65 adjacent to and rigid with pinion 64. A pendulum 68 is loosely mounted on the end of valve stem 55 and rigidly connected with a two-armed lever 69 carrying at its two ends teeth 10 which can engage the teeth on the Wheel 61 to hold the latter normally against rotation.

When the valve is opened, springs 5'! and 59 are wound and a force is exerted by One tooth of the wheel 61 against one of the teeth 16,

causing the pendulum 68 to start swinging. As

the pendulum 68 swings back and forth the teeth '20 of lever 69 release and reengage alternately the gear wheel 61 and thus turning of the cam 58 to the point where it raises the detent 63 is delayed for the predetermined initial period. In

in Figs. 8 and 9, the valve stem 1| has fixed thereto a toothed sector-shaped disc l2 and loosely mounted thereon. a. cam 13. The valve return spring is denoted by the reference nu- "meral 14 and the spring which urges the cam 13 to an angular position corresponding to that of disc i2 is denoted by the reference numeral 15. In this embodiment, a, single detent i6 is employed which tends to engage, by means of a tooth H, the toothed portion of the disc 12 when the valve is opened to a minimum extent.

The cam 13 has a raised portion 18 and a recessed portion IS. A thermostat controlled lever arm assumes a position outside of the 59 is the.

5. path of any portion of cam 13 as long as the thermostat is not heated (see positionshown in dot and dash lines in Figs. :8 and 9).. Thus, when the burner fails to become ignited prior to the end of the initial period during which movement of the cam 13 to its operative position is delayed by any suitable delay mechanism, as described with regard to Figs. 1 to 7, the raised'portion 78 of cam 13 will, at the end of the initial period, lift the detent 16 and permit return oi the valve to its closed position under the action oi the valve return spring 14.

Whenever the burner flame becomes extinguished and heating of the thermostat ceases, the lever 80 returns to the position shown in dot and dash lines in Figs. 8 and 9, thus permitting cam 13 to complete its movement in counterclockwise direction as shown in Fig. 9. This causes lifting of the detent 16 by the raised cam portion 18 of cam .13 and return of the valve to its closed position under the action of spring M. The teeth of disc 12 have on both sides surfaces equally inclined to a radial line passing through the tip of the tooth so that ratchet movement of the disc and, therefore, a manual adjustment of the valve to any desired position is possible while tooth T! is in engagementwith the toothed part of disc 12.

It will be understood that other modifications and variations of the invention could easily be designed and that the scope of protection is not to be limited by the examples illustrated and de scribed except as stated in the following claims.

What I claim is:

1. In an automatic cut-ofi valve for fluid fuel burners, the combination with a valve casing in the conduit through which the fluid fuel is fed. to the burner and a manually adjustable rotary valve in said valve casing, of a first rotary element in the form of a disc rigidly secured to said valve and provided with ratchet teeth on at least part of its periphery, a first spring urging said valve to its closed position, a detent arranged to cooperate with the ratchet teeth on said disc to hold said valve in open position, a second rotary element in the form of a cam supported co-axially with and rotatable relatively to said disc and valve, a. second spring weaker than said first spring and urging said cam toward an angular position corresponding to that of the disc and valve, said cam having a raised portion for co-operation with said detent when the cam assumes an operative position corresponding to a predetermined opening of the valve so as to release the disc and valve from the detent for return to the closed position of the valve, a delay mechanism operatively associated with said cam to delay movement of the latter from its position corresponding to the closed position of the valve to its operative position for a predetermined initial period after the valve has been opened, a thermostat adapted to be installed adjacent the burner, and means controlled by said thermostat and operative if the thermostat has become heated by the burner flame prior to the However, when the thermostat is heated by the burner flame prior endof said initial period and as long as salethermostat is heated to interfere with themovement of ome of said rotary elements so as to pee-'- vent release of the-valve for return to the closed position.

2; An automatic cut-cit valve as claimed. in-

claim 1, in which the valve has a projecting stem, said disc being rigidly secured to said valve stem and said cam being loosely mounted on said valve stem. a

3. An automatic cut-off valve as claimed in claim 2., including a valve casing inwh ich said valve is rigidly mounted, said first spring being a coil spring surrounding said valve-stem and having its ends secured to said valve casing and said disc, respectively, and said'second spring being a coil spring surrounding said valve'rstem and having its ends secured to said disc and-said cam, respectively. v

4. An automatic cut-off valve as claimed in claim 1, in which said delay mechanism comprises a hydraulic dash-pot including a cylinder element and a piston element, one of said ele ments being hingedly secured to the valve casing and-the other element "being hinged to said cam. 5. An automatic cut-olrvalve as claimed in claim 1, in which said delay mechanism com:- prises an eseapement geared to said cam.

6. In an automatic cut-ofi valve for fluid fuel burners, the combinationiwith a manually adjustable rotary valve in the conduit through which. the fluid fuel is fed to the burner, 01'' it disc rigidly secured to said valve and provided with ratchet teeth on at least part of its periphery a first spring urging said valve to its closed position, two

detents each arranged for cooperation with the disc and valve from said first detent for return to the closed position, a delay mechanism associated with said cam to delay movement of the latter from its position corresponding to the closed position of the valve to its operative position for a predetermined initial period after the valve has been opened, a thermostat adapted to be installed adjacent the burner, and a lever controlled by said thermostat and arranged for cooperation with the second detent to hold said second detent away from the position in which it is capable of engaging the ratchet teeth of said disc when the thermostat is not heated and to move the second detent out of engagement with the ratchet teeth of the disc when heating of the thermostat ceases, while permitting engagement of the ratchet teeth of the disc by said second detent if the thermostat has become heated prior to the end of the initial period and as long as the thermostat remains heated by the burner flame.

'7. An automatic cut-01f valve as claimed in claim 6, in which the ratchet teeth on the disc have on both sides surfaces equally inclined to a radial line passing through the tip of the tooth so that the disc and valve can be manually adjusted in either direction regardless of the engagement of either one or both detents with the ratchet teeth.

8. An automatic cut-oil valve as claimed in claim 6, in which said two detents are angularly ofiset withrespect to each other in such a way that said first detent cannot, engage the ratchet teeth on said disc unless the valve is open to a predetermined extent, while said second detent can engage said ratchet teeth in any open position of the valve corresponding to a lesser opening thereof whenever the thermostat is heated.

, 9. In an automatic cut-off valve for fluid fuel burners, the combination with a manually adjustable rotary valve in the conduit through which the fluid fuel is fed to the burner, of a disc rigidly secured to said valve and provided with ratchet teeth on at least part of" its periphery, a first spring urging said valve to its closed position, a

detent arranged tocoOperate with the ratchet teeth on said disc so as to hold said disc and valve inany adjusted open position in excess of a predetermined minimum valve opening, a cam supported co-axially with and rotatable relative to said disc and valve, a second spring weaker than said first spring and urging said cam toward an angular position corresponding to that of the disc and valve, said cam having a raised portion for cooperation with saiddetent when the cam assumes an operative position corresponding to a predetermined opening of the Valve. so as to release the disc and valve from the detent for return to closed position, a delay mechanism associated with the cam to delay movement of the latter from its position corresponding to the closed position of the valve to its operative position for a predetermined initial period after the valve has been opened, a thermostat adapted to be installed adjacent the burner, and a lever controlled by the thermostat to assume upon heating of the thermostat by the burner flame prior to the end of the initial period a position in the path of a portion of the cam so as to prevent the camfrom reaching its operative position while permitting movement of the cam to its operative position and consequent release of the disc and valve from the detent for return to closed position if the burner flame fails to heat the thermostat prior to the end of the initial period or the burner flame is extinguished and heating of the thermostat ceases after the end of the initial period.

10. An automatic cut-off valve as claimed in claim 9, in which the ratchet teeth on the disc have on both sides surfaces equally inclined to a radial line passing through the tip of the tooth so that the disc and valve can be manually adjusted in either direction regardless of the engagement of the detent with the'ratchet teeth of the disc.

= BORIS DOUVAN.

References Cited in'the file of this patent UNITED STATES PATENTS Number Name Date 738,418 DAquila Sept. 8, 1903 1,142,454 Papini i; June 8, 1915 1,174,825 Casler Mar. 7,1916 1,745,580 Mohr Feb. 4, 1930 1,879,381 Margilofi? Sept. 27, 1932 2,022,066 Webber Nov. 28, 1935 2,049,960 Jones Aug. 4, 1936 2,288,208 Rabinowicz June 30, 1942 FOREIGN PATENTS Number Country Date 498,279 France Jan. 7, 1920 183,790 Switzerland July 1, 1936

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