US2387164A

US2387164A - Floor fuknace gas control means

Info

Publication number: US2387164A
Authority: US
Publication date: 1945-10-16
Anticipated expiration: 1962-10-16

Description

Oct. 16, 1945. v cc Y 2,387,164

FLOOR FURNACE GAS CONTROL MEANS Filedlvkarch 4,. 1943 5 Sheecs-Sheet 1 I v J6 7 I a? I ma 0 c 1 3 'UTM'W Oct. 16, 1945.

L. V. M CARTY FLOOR FURNACE GAS CONTROL MEANS Filed March 4, 1943 5 Sheets-Sheet 2 44 J4 Zozzraiaa V/Vc 622/1? at 16, E945. L. v. MCQARTY ,3?,fi4

FLOOR FURNACE GAS CONTROL MEANS Filed March 4, 1943 5 Sheets-Sheet I5 M I/vu/u cam/m; 0/ I1 Mil/IV elm Em MAM/50mm? v/uvz M0 [[9 CV/ILI/E 010.550 {,9 J 20/ mm BURNER 6 mm vs OPENS R ct I, 1945. 1... v. M cART-Y 9 9 FLOOR FURNACE GAS CONTROL MEANS Filed March 4,' 1945 5 Sheets-Sheet ct. 16, 1945 1.. v. M cARTY FLOOR FURNACE GAS CONTROL MEANS FiledMardh 4, 1945 s Sheets-Sheet 5 Patented on. 16, 1945 UNITED- FLOOR-FURNACE GAS coN'raoL MEANS Lourdes V. McCarty, Milwaukee, Wis}, assignor to Milwaukee Gas Specialty Company, Milwaukee, Wis., a; corporation of Wisconsin Application March 4, 1943, Serial No. 477,942

14 Claims.

This invention has to do with means for controlling flow of fuel to a burner, such means being particularly suitable for use in connection with v floor furnaces and analogous devices.

My invention isdirected to control means of the character referred to having safety means for automatically shutting off flow of fuel to a main burner and, preferably, to an associated pilot burner, in the event of extinguishment of the pilot burner or of both burners due to temporary interruption of flow of fuel, blowing out of the burners, such as might be caused by an exceptionally high draft, or other causes. I provide control means of the character stated comprising a thermal control for automatically regulating flow of fuel to the main burner in accordance with variations in temperature of the fluid heated thereby, and also provide means whereby the flow of fuel to the main burner may be controlled manually independently of the thermal control when desired. The placing of the now of fuel to the main burner under control of thermal responsive means, or under manual control, is efiected by adjusting means, the latter means being effective for completely shutting off the flow of fuel to the main burner independently of the thermal responsive means, when desired. More specifically, I provide a safety valve controlling flow of fuel to the main burner and to the pilot burner, and a valve controlling flow of fuel to the main burner, the safety valve beingurged in closing direction and normally held open by electromagnetic meansv energized by a thermoelectric generator subjected to the heat'of the pilot burner so that, upon extinguishment of the pilot burner, the safety valve automatically closes, shutting off supply of fuel to both burners. The main burner valve normally is operated by thermal responsive means but may be operated manually, as above stated, by proper adjustment of the adjusting means, and the latter means may be operated to trip the safety valve causing closing thereof and may also be operated to reset the safety valve into its open position in which it normally is held by the electromagnetic means, when the pilot burner is lighted and the coil of the electromagnetic means is energized by the floor furnace with control means embodying my invention applied thereto, parts being broken.

lying the fuma'ce;

Figure 1 is an isometric sectional viewlof a away and the floor structure being ,shownffragmentarily with a register supported therebyover- Figure 2 is a planfl view, on an enlargedscale,

I of the control means of my invention;

Figure 3 is a sectional view taken substantially on line 3-3 of Figure 2, certain parts being shown in elevation and certainother parts being broken w y;

Figure 4 is a sectional, view taken subst ntially on line 4-4 of Figure 3; I fff Figure 5 is a sectional view taken substantially on line 55 of Figure 3, certain parts beingfshown in elevation and the housing being shown'aspartly broken away, on an enlarged, scale;

Figure 6 is a sectional view taken su tantially on line 66 of Figure 3, certain parts being shown in elevation and certain other parts being broken away, on an enlarged scale;

Figure 7 is a detailv underneath view, on an enlarged scale, of the main valve operating lever;

Figure 8 is an axial vertical sectional view of a modified form of thermostat andassociated' parts, parts being shown in elevation and certain other parts being broken away and the topwall thermoelectric generator heated by the pilot burner. I also provide means for causing opening and closing of the main burner valve with a snap action, assuring safe and satisfactory operation thereof. Further objects and advantages of my invention will appear from the detail description.

In the drawings:

Figure 9 is an axial vertical sectional view of the safety valve and the electromagnetic means associated therewith and associated parts, the adjacent portion of the housing being'shown in section, this view being onan enlarged scale; and

Figure 10 is a diagram showing the different positions of the adjusting means.

In Figure 1 I have illustrated the control means of my invention as applied, by way of example, to a floor furnace f. This furnace may be of any suitable known construction and a brief description thereof will suffice. The furnace comprises an'ou'ter casing ll within which is disposed an intermediate casing I2, which may be of double walled construction for the major portion of its length, the bottom edge of the intermediate casing l2 being spaced from the bottom wall l3 of casing H, defining therewith an opening it. The space between the casings II and I2 defines a cold air return passage l5 opening at its lower end, at It, into casing l2 and, at its upper end, through the outer portion of a 1' ister I6, supported in overlying relation to the furnace by floor H, from which the furnace 1 depends. An inner casing 18 is disposed within casing I! in spaced relation thereto, defining therewith a. heated air passage l9. The upper portion of casing i2 is inclined upward and inward, as shown, and defines a heated air opening 20 through which heated air fiowsupward through the inner portion of register l6. The

inner casing 18 is provided with an outlet 2| for gas thereto. A pilot burner 25 is mounted on main burner 23 by a bracket 26 secured thereto, this bracket also serving to support'a thermocouple 2! in position adjacent the pilot burner, the latter being provided with suitably disposed jet openings for directing a flame toward the main burner for igniting the latter, and a flame against 'the thermocouple 2i for heating the latter, for a purpose which will appear presently. It will be understood that when'the main burner- 23 is in operation, relatively cold air flows through the outer portion of register l6 downward through passage I5, thence through opening l4xinto th heated air passage 19, this air nowingabo'ut the combustion chamber defined by the inner casing l8 so as to be heated thereby, the air thus heated then flowing upward through the inner portion of register l6. Preferably,-the outer casing H is provided with a suitable opening 28 for supplying fresh air in suitable proportion to the air in passage IS. The inner casing I. may also be provided, at the top thereof,,with an inspection opening normally closed by a hinged lid or cover 30. It is 'to be understood that the'furnace shown and above described is by way of example only and that any other suitable known fioor'iurnace may be used. Also, as noted, the control means of my invention, while particularly suitable for use in connection with floor furnaces, is not limited to such use and may be used to advantage for many other purposes.

The control mechanism of my invention is conveniently disposed within an appropriately formed housing 35, which may be substantially cubiform as shown. Housing 35 is provided at one side thereof with a cover plate 36, with an interven ing gasket 31, cover plate 36 being secured to the housing by screws 38, beneath the heads of which are disposed spring washers 39. Cover plate 36 is readily removable to give access to the parts within housing 35, and the latter is provided at one end thereof with an integral nipple 40 for reception of a pipe 4| screwing the'reinto. Nipple 40 opens into housing 35 through an inlet opening 42 thereof, through which opening the fuel, which may be fuel gas, ,is admitted to housing 35 under control of a safety valve, as will be explained presently. Housing 35 is further provided, at its lower wall, with an integral downwardly extending nipple 43 which is interiorly threaded, into which nipple is screwed an outlet pipe 44 leading to conduit 24 of the main burner 23 01' furnace The outlet pipe 44 is provided at its other end with a tip member (not shown), extending into a mixing chamber 45 at the outer end of conduit 24, this mixing chamber having is controlled by a safety valve, as above stated,

and communication between outlet pipe 44 and the interior of housing 35 is controlled by a main burner valve, as will be explained more fully later, and when these two valves are opened gas may flow from pipe 4| into housing 35 and from the 'latter through pipe 44 to the main burner 23.

Housing35 'isprovided interiorly thereof with a hollow boss-46 "(Figure 3) defining an inlet chamber in free communication, through inlet opening 42, with nipple 46 and inlet pipe 4|. Boss 46 is provided, through its top wall, with a valve port 41. the lower portion of the surrounding wall of which isshaped to provide a seat for a downwardly opening and upwardly closing safety valve member 48. A valve stem 49 is loosely secured at its upper end, by a pin 49 (Figur 9), to valve member 48 and extends downward therefrom into a thermo-electric control device associated with a tubular element or sleeve 50 of step formation interiorly, as shown, extending downward from the bottom wall of housing 35 in alignment with the boss 46. The thermo-electric control device may be similar to that disclosed in the patent issued to Clarence Wantz on January 12, 1943, No. 2,307,370. The thermo-electric control device includes a lead connection cap and magnet and armature housing assembly mounted upon the lower end of sleeve 50 and closing the latter. The lead connection cap 52 is formed of any suitable 'or preferred known insulating material and is 7 cap 52 and threading into sleeve 50, there being an intervening gasket 54 providing a fluid tight seal between the cap and the sleeve. A magnet housing 55, in the form of a downwardly openabout, as above noted.

an adjustable plate or disc for regulating the ing cup-shaped metal shell, is mounted in extension 53 of cap 52 in a. suitable manner, conveniently by having a pressed fit therein. The upper portion 56 of housing is slightly reduced in diameter and has a pressed fit in the lower portionof an armature housing 51, in the form of a cup-shaped metal shell similar to housing 55. Valve stem 49 is slidable through the upper end of armature housing 51, and through a disc 59 thereabove seating against an annular shoulder 60 at the lower end of boss 46. Packing material 6|, which may be felt or any other suitable material, is confined between the upper end wall of armature housing 51 and disc 59, and is held under compression by a compression spring 62 mounted about valve stem 49 and confined between valve member 48 and disc 59, the latter being provided with a central upwardly extending projection 63 coaxial with neck 64 of valve member 46, to which neck 64 valve stem 49 is attached by pin 49, the projection 63 and neck 64 receiving the end portions of spring 62 and centering the latter. The upper end of valve stem 49 preferably has slight clearance in the valve member 46, having a certain amount of looseness therein and facilitating accurate seating of this valve member. It will be seen that the compression spring 62 urges valve member 48 upward in closing direction'and also serves to compress the packing 6| about valve stem 49 so as to providea fluid tight seal there- An armature 66, of disc shape, is secured on the lower end of valve stem 49, within the armature housing 51, the attachment of this armature to stem 49 being suiliciently loose, as indicated at 67,

to permit relative movement of armature 66 sufficient to assure accurate seating thereof on the pole ends of the frame of an associatedelectro magnet.

The electromagnet comprises a magnet frame 69 of elongated U-shape, provided centrally of its bight portion with a screw stud I welded or otherwise suitably secured thereto. This stud 10 extends through an opening in the lower end of cap 52, into a recess II therein which accommodates a nut I2 screwing onto stud I0 and having a kerf I3 therein for reception of the blade of a,screw driver or other suitable tool.. A spring washer I5 is disposed between nut 12 and the wall at the upper end of recess I I l The legs of magnet frame 69 extend upward, through suitable Openings in the upper end of magnet housing 55, and are disposed to attract armature 66 and hold it in its lowered position, when the safety valve member 40 has been moved downward to open position, the electromagnet when energized thus holding the safety valve member open. But the electromagnet is incapable, when energized, of moving the armature 66 from its released or retracted position, shown in Figure 9, downward into its attracted position, and once the safety valve member 48 has been closed it remains closed, whether the electromagnet i energized or not, until moved downward into its open position by means to be later described, and if the electromagnet is energized at that time it holds valve member 48 in reduced portion 86 of stem 82, the upper end of stud 81 being peened over at 89, at the upper face 'of collar 88 which is thus secured on stud 81 and confined against relative axial or endwise movement. It will be noted that the opposed faces of its lower or open position in opposition to the are connected to metal terminal connectors or

posts

18 and 19 fixed rigidly in cap 52, conveniently bypmoulding the material of the cap about the terminal connectors. The lower end portions of the

connectors

18 and 19 are split and bored for reception of the terminal portions of the leads of an associated thermocouple, about which terminal portions the connectors I8 and I9 may be contracted or clamped by means of associated clamp screws 00. The thermocouple 21, shown in Figure 1 in association with the pilot burner 25 and the main burner 23, may be, in general, constructed similarl to the thermocouple disclosed in the patent to Oscar J. Leins, No. 2,126,564, issued August 9, 1938, and the terminal portions of the leads of the thermocouple may be constructed and arranged in the manner disclosed in the above identified patent to Clarence Wantz, for cooperation with the

terminal connectors

18 and 19. Within the broader aspects of my invention, any other suitable thermocouple or thermoelectric generator may be employed, and any other suitable means may be provided for connecting the thermoelectric generator leads to the winding of the electromagnet. Suffice it to state that I provide asuitable thermoelectric generator the leads of which are suitably connected to the ends of the electromagnet winding, for energizing the latter responsive to heating.of the thermoelectric generator.

Valve member 48 is provided with an upwardly extending neck 8| passing through valve port 41. An upper valve stem 82 is loosely secured at its lower end in neck 8|, by a pin 83 restrained against endwise movement by a retainer 84 seating in a circumferential groove in neck 8

I. Stem collars

85 and 88 are oppositely inclined defining between them an annular channel of V-shape in cross section. Element 86 of stem 82 passes through an opening 9I, of appreciably greater extent than element 86, in hefoute'r end portion 'of asafety valve trip andfresetjlever 92, pivoted intermediate its ends on a'sh'aft' 93 extending transversely of housing 35,- as' shown in Figure 6. Shaft 93 has its end portions reduced in diameter and one end thereof is mounted in a boss 94 formed integrally with thexadjacent side wall of the housing 35, the other reduced end portion of shaft 93 extending through a spacer 95 disposed at the inner face of a retaining plate 96, inwhich such end portion of shaft 93 is mounted. The retaining plate 95 is of irregular polygonal shape, as indicated in dot and dash lines in Figure 3, and is secured in any suitable manner, conveniently by screws, to boss 46 and thickened portion 9I-of the top wall of housing 35. It will be seen that lever 92 is mounted for rocking movement about'the axis of shaft 93 and that movement of this lever in clockwise direction, as viewed in Figure 3, will move the safety valve member 48 downward, movement of lever 92 in counterclockwise direction resulting in upward movement of valve member 48 into its closed position, shown in Figure 3, as will be explained more fully later.

82 is provided at its upper portion with an enmounted in tabs I04 depending from an adjusting lever I05 of channel 7 cross section, extends between fingers I00 and IM for contact therewith, this shaft being restrained against endwise movement by one side wall of'housing 35 and a stop pin I06 secured in shaft I03 adjacent the other end thereof, as shown more clearly in Figure 5. Lever I05 is pivoted, at theend thereof adjacent I valve stem'82, on,a transverse shaft I08 passing through hub elements I09 of lever I05, the end portions of shaft I08 being reduced in diameter and one of such end portions being mounted in a boss I I0 integral with one side wall of housing 35, as shown in Figure'6, the other end portion of shaft I08 being mounted in the retaining plate 96. Lever I05 is provided, at its underface and adjacent its other end, with a centering disc III welded or otherwise suitably secured thereto, about which seats the upper end of a compression coil spring II2 the lower end of which seats about a boss II3 integral with and extending upward from the bottom wall of housing 35, boss II3 being coaxial with an exterior boss II4'extending downward from this wall. The bosses I I4 and H3 are suitably bored and threaded for reception of the end portion of a tube II5 screwing thereinto, this tube being connected to the pilot burner 25 for supplying fuel thereto. The compression spring II2 urges adjusting lever I05 updistance between the arms thereof.

arm of element I4I is provided, at its lower end,

i ward in a clockwise direction about the axis ofi shift I. as clear from Figure 3, while permitting flow of gas between me cnvciatIon of thisspring and thence through tube H5 tothe pilot burner. Y

One of thetabs 1 041 01 the adjusting lever I05 ward boss 46 and has its intermediate portion bent upward at an angle at I20, as shown. The upper portion of; regulating lever. H8 is formed to pro- "vide a downwardly extending element I2I, defin- ,.ing,a recess I22 of inverted conical shape for reception of an associatedpoint member; as will be explained more fully later.

The lower end portion of regulating lever II1 bears upon anarcuate spring tongue I24 struck from a mainlburner valve operating lever I25, this lever having two lateralarms I26 extending therefrom towardboss 46. Each arm I26 is rivassumes downward relative thereto, as shown more clearly in Figure 3, this plate having a centering disc I" secured thereto at its under face adjacent the inner end of extension I39. Plate I46" alsois provided, outward from disc I41, with a circular opening I48 underlying the mid-portion of spring I45. At its other end, extension I39 is provided with a downwardly directed finger I49 having a. reduced stud I50 extendingthrough 9. corresponding opening in a tongue I5I at the other end of spring' I45. The offset portion of plate I46. de fines with depressed element I40 of extension I39 9. slot through which the spring I45 passes. A stop screw I52 (Figure 3) is threaded through hippie 43 and is formed at its upper end portion to provide a reduced stud I52 aligned with opening I48, substantially coaxially therewith. A coil compression spring I53 is confined between plate I46 and the bottom wall of housing 35, the upper end of this spring seating about disc I41 and the lower portion thereof seating about a centering stud I54 projecting upward from the bottom wall of housing 35. The stop screw I52 and spring eted or otherwise secured to the outer portion of bushing I28, which outer portion is of increased diameter, as shown. .The bushings I28 receive a shaft I30, mounted for rotation at one end in I a suitably bored stud I3I secured in the side wall of housing 35 remote from retaining plate 96, the

inner end portion of stud I3I; extending into a 1 corresponding recess in the outer end of the adjacent bushing I28. The other bushing -I28 is provided in its outer face with a recess concentric with shaft I30, which recess receives the inner portion, of increased diameter, of a bushing I32 having a reduced neck inserted through retaining piate'96, the outer end of this neck being spread or peened over at I33 for securing bushing I32 in plate 96. Shaft I is of such length,

and the portion of this shaft extending into stud Ill is of such length, that cover plate 36 is effective for preventing accidental endwise displacement of shaft I30 sufficiently to withdraw the latter from stud I 3|. A main burner valve carrying lever I is mounted on shaft I30, by means of tabs I35 extending upward from lever I35 "at each side thereof, these tabs I36 being spaced from the inner ends of bushings I28 by spacers I31 extending about shaft I30. The main valve operating lever I25 and the main valve carrying lever I35 are thus mounted on shaft I30 for independent movement about the axis of this shaft.

Lever I25 is provided. at one side of its other end, with a relatively narrow extension I39, as will appear more clearly from Figure 7, this extensionbeing provided, intermediate its length. with a depressed element I and, a short distance I and associated parts are so related that the regulating lever I25 has a snap action asit approaches the limit of its downward movement and as it starts its upward movement, as will be explained more fully later.

Lever I 35 carries, at its other end, a valve disc I55 which flares downward atits under face, for seating upon seat element I56 of a valve seat member I51 mounted in an upward extension I55 01 nipple 43. Extension I58 may be in the form of a thickening of the. bottom wall of housing 35, extending the full width thereof, and nipple 43, in-

cluding extension I58, is provided with a bore of step formation providing a shoulder I59. overlying the outer portion of a flange I60 at the lower end of seat member I51. The portion of nipple 43 through which seat member I51 extends is unthreaded. Nipple 43 is interiorly threaded at its intermediate portion, fo reception of an annular lock nut I6I screwing therein and having an axially extending circumferential rib I62 which contacts the under face of flange I60 and cooperates therewith and with shoulder I59 for securing seat member I51 in position. When valve I55 is in its closed position, shown in Figure 3, it seats upon the seat element I56 of membe I51, closing the upper end of the latter member and thus preventing flow of gas from housing I35 to the pipe 44 leading'to the main 3 burner. Valve disc I55 is provided with a central beyond this element, being bent to provide a terminal element "I of substantially inverted U- shape, as shown more clearly in Figure 3. A screw I42 threads throughthe inner arm of element I4I', with its head contacting the outer face of the outer arm of this element, for adjusting the The outer upwardly extending neck I55 which fits loosely through lever I35, the upper portion of this neck beingreduced, for reception of a washer I66 seating on the upper face of lever I35, the upper end of neck I65 being spread or peened over the washer I66, as shown. In that manner valve disc I55 is connected to lever I35 for movement therewith, this connection having slight play or loose ness to assure accurate seating of valve disc I55 on the valve seat element I56 of valve seat member I51. Lever I35 is provided, a short distance from the valve carrying end thereof, with an integral upwardly extending arm I68 (Figure 3) provided in its inner edge with a rectangular notch I69 which receives the adjacent lateral edge portion of regulating lever I25, providing a finger I10 at the upper end of notch I69 and overlying lever I25. A leaf spring I1I is suitably secured, as by riveting. to arm I60 and has its upper portion extending therefrom at an inclination upward toward the regulating lever II 8. This upper portion of spring "I underlies the lower corner of extension II1 of the adjusting lever I05, as shown in Figure 3. During automatic operation of the control, extension H1 is spaced above spring I1I, permitting movement of regulating lever I25 and the main burner valve lever I35 independently of adjusting lever I05.

The conical depression I22 of the regulating lever II8 receives the conical point element of a point member I15 screwed on the lower 'end of a threaded portion of reduced stem I16 (Figure 3) of a plunger I11, of increased diameter, slidable in a barrel I18 having its lower end flanged inward to limit downward travel of plunger I11, as shown. At its upper end barrel I18 is provided with an outer circumferential flange I19, against which seats the upper end of a coil compression spring I80 disposed about barrel I18. Spring I80 is confined between flange I19 and a nut 'l8I screwing on stem I16 and having an upward extension centering the lower end of spring I80. A disc I82 seats upon the upper end of barrel I18 and is disposed at the upper end of a metal bellows I83 within the lower portion of a cylindrical housing I84, in the lower end of which is secured a cup I85 to which the lower end of the bellows I 83 is secured so as to form a fluid tight and pressure resistant closure therewith. Cup I85 is provided with a central opening of proper size to accommodate the lower end of barrel I18 and the spring I80. Cup I85 is disposed in an enlargement at the lower end of housing I84, provided at its lower end with an outer circumferential flange I86. This flange I 86 is clamped in the upper end of a boss I81 integral with the top wall of housing 35 and defining an opening through which the stem I16 and spring I80 extend, this boss having a recess in its upper end providing a shoulder between which and a clamping ring I88, secured to boss I81 by means of screws or in any other suitable manner, flange I86 is clamped, with an intervening gasket I90. The upper end of the cylindrical housing I84 is closed by a wall I! and a collar I92 of a stop pin I93, collar I92 fitting snugly through wall I9I and beingsecured thereto so as to form a fluid tight and pressure resistant closure therewith, conveniently by soldering. The stop pin or post I93 is provided, ad- J'acent its upper end, with a head I94, above which collar I92 extends, this head having a bore I95 extending transversely therethrough and communicating with an intersecting bore I96 therein extending downward through collar I92. A short filling tube I91 is secured in collar I92, for charging the housing I84 with a suitable amount of a thermosensitive fluid, such as ether, after which the upper end portion of tube I91 is flattened at I98 and sealed by soldering win any other suitable known manner to provide a fluid tight and pressure resistant closure therefor. It will be understood that the housing I84 and associated parts, together with the charge of thermosensitive fluid therein, constitute thermostatic means for exerting downward pressure on regulating lever II8, this pressure varying in accordance with temperature variations, the post I93 providing a stop positively limiting upward expansion of the bellows I83 and also limiting upand interiorly threaded for reception of an adjusting pin 202 having a threaded upper portion 202 of increased diameter screwing into adjusting screw 20I. The lower unthreaded portion of stem 202 is slidable through an opening in the thickened portion of boss 91 of the top wall of housing 35, this boss being provided with a recess constituting a continuation of the bore of nipple 200 and receiving means for forming a gas tight closure about stem 20I. The latter means comprises asbestos or other suitable packing material 204 confined between packing

gland gaskets

205 and 206, the latter of frusto conical shape and seating in a corresponding recess in the lower end of a follower 201 urged downward by a compression coil spring 208, confined between the lower end of adjusting screw 20I and the upper face of the head of follower 201, the latter having a reduced neck for centering spring 208. Adjusting stem 202 is locked in adjustment by a set screw 209 of known type threading into screw 20I and turned into binding contact with the upper end of stem 202. It will be apparent that when the adjusting screw 20I is threaded'into the neck 200 the adjusting stem 202 will force lever I05 downward about shaft I08, in opposition to the compression spring H2, and when adjusting screw 20I is screwed out of nipple 200 lever I05 will be moved upward about shaft I08 by spring A pin 2I2 extends through adjusting screw 20I diametrically thereof, above set screw 209, and is secured in position by a set screw 2I3 threaded into screw 20I. Pin 2I2 projects radially beyond screw 20I into an arcuate slot 2I4 in a hood 2I5, the body portion of which is disposed in concentric spaced relation to adjusting screw 20I and to neck 200, this hood being provided at its upper end with a reduced neck 2I6 fitting about and free from adjusting screw 20I. Hood 2 I5 is provided, at its lower end, with an arcuate projection 2I8, constituting a stop cooperating with a second stop, in the form of a stud 2l9 having a reduced threaded shank screwing into the top ward movement of plunger I11, thereby limiting I wall of housing 35. Extension 2I8 is providedwith a T-slot 220 the stem of which opens through the lower face of extension 2I8, this slot receiving an outwardly bent terminal element 22I, at the lower end of a torsion coil spring 222 disposed about neck 200, between the latter and hood 2I5. The upper end portion of spring 222 is formed to provide a hook element 223 which engages about the outer end portion of pin 2I2. Torsion spring 222'tends to turn adjusting screw 20I in a clockwise direction, as viewed in Figure 2, relative to hood 2I5, and normally holds pin 2I2 in contact with hood 2I5 at the clockwise or left end of slot 2I4. I

Adjusting screw 201 is provided with an upper enlarged portion 225 from the upper end of which extends a reduced neck 226. Portion 225 is splayed or flattened at its opposite sides at 221 (Figure 2). For reception of a socket member 228, flattened interiorly at its opposite sides for cooperation with the flattened sides of portion 225 of adjusting screw 20I. Socket member 228 is provided, in its upper portion, with a reduced bore 230 which receives neck 226 with slight clearance thereabout, and is secured to neck 226 by 0 means of a pin 23I the end portions of which extend loosely through openings insocket member 228. The flat sides of socket member 228 are spaced slightly from the flat sides of portion 225 of' adjusting screw 20I and cooperate therewith for turning the latter in desired direction, the

wise suitably secured to socket member 228 and and associated parts.

connections thus provided between socket member 223 and portion 225 of the adjusting screw providing a certain amount of universal movementtherebetween, suillcient to accommodate anyslight misalignment of the parts. while providing an effective connection for adjusting screw An adjusting rod 234 is welded or otherextends therefrom upward through an opening in register I3 (Figure 1), the upper end of rod 234 being squared for reception of a key 235 of known type for turning rod 234 in desired direction. Red 234 is provided, adjacent the upper face of register I8. with a pointer 238 movable over an appropriately marked dial 231 which may be carried by the register [8, or by a plate mounted thereon. Preferably, a coil compression spring 238 is mounted about rod 234 and is confined between bottom wall I3 of the furnace I and. an

. abutment, such as a washer 233, mounted about rod 234 andrestrained against upward movement therealong by a cotter pin 240 secured through rod 234. Spring 238 carries the weight of rod 234 and key 235, thus avoiding any objectionable downward pressure on the adjusting screw 2M and associated parts such as might tend to interfere with eflecting and maintaining desired adjustment of the control means. The thermostat shown in Figure 8 is, in general, similar to that shown in Figure 3, but embodies certain variations for a purpose which will be explained later. Referring to Figure 8, the thermostat housing comprises a lower tubular section 242 and an upper tubular section 243, these two sections together enclosing the bellows ingsection 242 to assure a fluid tight and pressure resistant closure therewith. At its lower end, collar 244 is provided with an outer circumferential flange 246 of step formation, the reduced lower portion of which extends: into a recess in boss 181, to which collar 245 is secured, convenientiy by screws 248 beneath the heads of which are disposed spring washers 249, there being a sealing gasket 258 disposed between the under face of collar 246 and the cooperating shoulder of boss I81. A collar 252, similar to collar 244, is secured upon the upper end of housing section 242 in the same manner as collar 244 is secured upon the lower end of this section. The upper housing section 243 is slightly enlarged at its lower end, at 253, and has secured therein, in any suitable-known manner, as by soldering, a bellows cup 254 to which the lower end of bellows I83 is secured. At the lower end of enlargement 253 housing section 243 is provided with an outwardly extending circumferential flange 255 of substantially L-shape in cross section. This flange 256 receives a sealing gasket 251 which seats upon the upper face of flange 258 of collar 252. A clamping ring 259 seats upon the upper face of flange 256, about enlargement 253 of housing section 243, and is secured to flange 258 by bolts 268 receiving on their lower ends nuts 26I, with spring washers 262 disposed between flange 258 and nuts 26I. The upper housing section 243 is provided with a top wall 263 provided, at its central portion, with a nipple 254 secured therethrough in a manner to provide a fluid tight and pressure resistant closure therewith. This nipple receives an end of a tube 255 suitably secured therein, as by soldering at 266, so as to provide a fluid tight and pressure resist- Section 242 is threaded,

ant closure therewith. Tube 285 opens at its other end into a bulb 251 secured thereon in a know manner, this bulb being of known type and the upper housing section 243 and bulb 281 being suitably charged with a thermo-sensitive fluid, such as ether or any other suitable fluid. It will be understood that the bulb 251 may be disposed in any suitable location remote from the thermostat housing, so as to control actuation of the thermostat responsive to temperature variations at a location remote from the thermostat housing.

Stem Illi of plunger I11 has its lower end portion reduced in diameter and threaded to provide a screw stud 218. A stem 21I of greater diameter than stem I15", is suitably bored and tapped from its upper end and threads onto stud 210, in contact with the lower face of a cup washer'21z clamped between the upper end of stem 2H and the lower end of th body portion of stem I15. Cup washer 212 receives and centers the lower end of compression spring I88 disposed.

about barrel I13 and confined between flange I15 thereof and cup washer 212. The lower portion of stem 2" is threaded at 215 for reception of a point 7 member secured thereon corresponding to the point member I15 of Figure 3. It will be understood that the point member secured on the lower end of stem 21I engages in. the conical depression I 22 of the main burner valve regulating lever II8 for exerting downward pressure thereon, in the same manner as point member I15 of the thermostat shown in Figure 3.

In Figure 1 the thermostat is disposed in the return passage I5 of furnace j and, accordingly, is subject to the temperature of the .cool air returning to the furnace. With the parts in the positions shown in Figure 3, the safety valve member 48 is in its closed position, to which it has been moved by compression spring 62, and the armature 55"(Figure 9) is in its raised or retracted position spaced away from the frame 38 of the electromagnet which, when energized, is incapable of moving it downward into its attracted position and thus opening the valve member 48. Accordingly, the valve member 48 remains closed, cutting off the flow of gas to the interior of housing 35 and, therefore, cutting off the flow of gas to the pilot burner tube H5, with the result that the pilot burner 25 is extinguished. The main burner valve I55 is also in its closed position shown in Figure 3 and the main burner 23 is extinguished, flow of fuel to the latter burner being prevented so long as valve I55 remains in its closed position. With the parts in their positions shown in Figure 3, hood 2I5 is in its position shown in Figure 2, with the right hand end of extension 2I8 in contact with stop M9, and pin M2 in contact with the hood at the left hand and of slot 2. This slot has a length or arcuate extent of the projection 2I8 has an arcuate extent of 82 and the stop 2I9 intercepts an arc of 30.

Referring now to the diagrammatic illustration of the dial 231 and associated parts, in Figure 10, when the parts are in the positions shown in Figures 2 and 3, the pointer 236 is at the pile mark, indicated by the letter P of the dial, and pin 2 I 2 is at the left hand or clockwise end of slot 2 I4. In order to set the control device for operation, the adjusting screw 2llI is turned in a counterclockwise direction in an arc of approximately 120 so as to be threaded outwardlyof nipple 280. That causes outward or upward movement of adjusting stem 202, permitting adjusting lever I05 been energized by the reset and trip lever is be swung pw rd about shaft ts by the compression spring H2. During this upward move ment of lever I05 shaft I03 contacts finger I of the reset and trip lever 92, swinging this lever in clockwise direction about shaft 93 and depressi'ng stem 02, thereby moving valve member 4-8 and stem 40 thereof downward in opposition to the compression spring 62, such a distance as to bring the armature 5B (Figure 9) into contact with the pole ends of magnet frame 59. or substantially so. Valve member 58 is then held in its full open position by the adjusting screw, and the fuel or gas may flow freely into housing 35 and thence through tube I I5 to the pilot burner 25, which is then ignited. The name of the pilot burner impinging pon the thermocouple 21 heats the latter sufilcient y to energize the coil II of the electromagnet which, when energized, holds the armsture 05 in attracted position and thus holds the safety valve member 48 in open position in opposition to compression spring 52. The positions occupied by the valve member 48 and the parts associated therewith, when this valve member is in its full open position, are indicated in dotted lines in Figure 9. After the electromagnet has heat of the pilot burner flame so as to hold the valve member 48 in open position;'the key 285 is released and torsion spring 222 turns adjusting screw 20I in clockwise direction, as viewed in Figure 2, through'an arc of 120, returning pin .iI2 to its normal position at the left or clockwise end of slot 2, the hood 2I5 remaining in position with the right hand end of extension 2I8 thereof in contact with stop 2I!.- The pilot burner is now lighted and the electromagnet is energized, conditioning the control means or regulating flow of fuel to the main burner as permitted by the adjusting means and the thermostat.

When the pilot burner has been lit and the resetting operation has been effected, with the safety valve member 40 being held in its open position, as above described, the adjusting lever I05 is in its position shown in Figure 3 and the 92 is in its position indicated by dotted lines in that figure. Shaft I03 is then disposed between fingers I00 and IOI in spaced relation to both thereof. The main burner valve I55 is then in its closed position shown and the lever I25 is held depressed by the pressure of regulating lever II8 exerted on finger I20, by the downward pressure exerted by the thermostat. In the depressed or lowered position of lever I25, the mid-portion of leaf spring I55 is engaged between the upper end of stop screw I52 and the under face of depressed element I40 of extension I39 of lever I25, the end portions of spring I45 being then flexed downward. In the depressed position of lever I25 the finger I10 of arm I58 of the main burner valve lever I35 is spaced a short distance above lever I25, as shown more clearly in Figure 6.

In order to admit gas to the main burner, the adjusting screw 20I is turned from the pilot position of Figure 10 in a clockwise direction through an arc of approximately 60, to the main burner position, indicated by the-letters MB." That burner valve operating lever I25 by leaf spring I45, supplemented by compression spring I53. When the pressure exerted by lever M8 on finger I24 has been sufficiently reduced, as explained, the end portions of leaf spring I45 will flex up ward with a snap action. That projects lever I25 upward and this lever. in its upward travel,

strikes finger I10 of armi50 a sharp blow, thus moving the lever I with lever I25 in the remaining upward travel of the latter lever. In that manner the main burner valve I55 is opened with a snap action, which is desirable as assur=- ing proper opening of that valve. Valve I55 is opened but a slight distance, suihcient to supply gas to the main burner in proper amount for low or dim operation of that burner. By turning adlusting screw 20I a further distance in clockwise direction, the adjusting lever I05 is moved downward a corresponding distance relieving the pressure exerted by lever I It on tongue I26, thus permitting further upward movement of lever I25 and corresponding increase opening of valve I55. In that manner the amount of gas delivered to the main burner may be varied to suit requirement. The extent to which the adjusting screw 20I may be turned in clockwise direction for increasing the opening of valve I55 is approximately 43", throughout which the valve I55 remains unq der control of the thermostat.

The range of the thermo-control of valve I55 is indicated by the arrow and by the letters TC adjacent thereto, in the diagram of Figure 10. In the full open position of valve I55, under control of the thermostat, the furnace has a heating capacity such that the return air flowing through passage I5 may have a maximum temperature or approximately 85 the thermo-control of the valve I55, extending from the MB" mark on the dial through a range 40 or approximately 43, the main burner valve I55 moves the adjusting lever I05 downward a short distance about shaft I08, in opposition to compression spring II2. This downward movement of lever I05 also causes downward movement of the regulating lever H8 and thereby reduces the downward'pressure exerted by the thermostat, particularly compression spring IBOthereoi, sufficiently to permitupward movement of the main is under control of the thermostat. I! the temperature of the return air tends to exceed the temperature for which the control is set; the expansive force of the thermo-sensitive fluid within the thermostat increases the downward pressure exerted upon lever H8, thus moving lever I25 downward with corresponding downward movement of the lever I35 and valve I55, thus reducing the amount of gas flowing through the main burner until the desired temperature has been restored. If the excess temperature is considerable, the main burner valve I35 may be closed,

thus extinguishing the main burner. butthe safety shutoff valve 48 remains open assuring supply of gas to thepilot burner so that, when the temperature has been sufilciently reduced and the main burner valve I55 is again opened, the gas flowing from the main burner will be ignited by the pilot burner.

In the closing of the main burner valve I55. the downward pressure exerted on tongue I24 of lever I25 by lever H0, increases until it overcomes the compression spring Iiid and, subse.--

quently, the leaf spring I05, the end portions of which then flex downward with a snap action. That results in quick downward movement of lever I35, the result being that the closing movement or the valve I55 is modulated and this valve, in the final stage of the closing movement thereof, is closed with a snap action, which is desirable as assuring closing of the main burner valve I55 in a manner effective to shut off all flow or gas to the main burner. It will'be seen that I have thus provided means whereby the main burner valve I55 is opened and closed by a snap action,

F. Throughout the range or thermo-control portion of the operation of the control means.

By turning the adjusting screw ZIlI in clockwise direction a further distance, beyond the thermocontrol area of the diagram of Figure 10, the point of extension N8 of adjusting lever I is brought into contact with leaf spring I'II, secured on arm I68 of the main burner valve lever I35. Continued turning of screw I in clockwise direction depresses lever I05 and, through'member II'I, moves the main burner valve I35 downward in closin direction, in opposition to compression spring I53. In that manner the main burner valve I55 may be closed, or moved in closing direction, manually and independently of the thermostat, the latter still being capable, however, of moving the main burner valve I55 in closing direction responsive to a temperature in excess of that for which that valve has been manually adjusted. The. manual control of the main burner valve. may extend through a range of approximately 115", as indicated by the arrow marked MC on the diagram of Figure 10. When the pointer236 reaches the position C on the diagram of Figure 10, the main burner valve I55 is in its fully closed position, to which it has been moved manually by turning of the adjusting screw 2! in clockwise direction. By

turning adjusting screw 2M a further distance in clockwise direction, beyond the C position on the dial, shalt I03 is moved into contact with finger IIII of the reset and release lever 92. Thereafter,

' fully closed position, moving the armature 66 into its fully retracted position, as shown in Figure 9.- This release 'and closing of the safety valve member 48 occurs when the pointer 236 reaches the position indicated by T on the dial, approximately clockwise from the position C on the dial.

From what has been said, it will be clear that by turning the adjusting screw2BI in counterclockwise direction, the safety shutoff valve 48 is reset from its closed position to its open position,

for supplying fuel to the pilot burner, and, after the pilot burner has been lighted and the thermocouple has been heated sufliciently to energize the winding of the electromagnet so as to hold valve member 48 in its open position, turning of adjusting screw 20I in clockwise direction opens the main burner valve I55, which is then under control of the thermostat throughout a predetermined range of further turning of screw 20I in clockwise direction, the control being then automatic and remaining so if desired. By continuing to turn adjusting screw20i in clockwise direction, beyond the thermo-control range of the device, the main burner valve may be adjusted manually and, if desired, closed, continued turning movement of adjusting screw MI in clockwise direction resulting in closing the safety shutoff valve and counterclockwise thereof, valve I55 is closed with thus shutting off supply of fuel to the pilot burner I wise direction, as viewed in Figure 10, from any point in the manual control range on the dial,

without having first turned this screw clockwise beyond the C position on the dial to any point on the thermo-control area of the dial, the main burner may be again placed under control of the thermostat. The adjusting screw 2M and associated parts thus provide simple and effective means for adjusting the control device as desired andfor placing the main burner valve either under control of the thermostat or under manual control. Also, by continued turning movement of the adjusting screw 2ll| in clockwise direction, the safety shutoff valve 48 may be released and closed,

as above described. Once that has been done n gas can enter the housing 35 until the resetting manual control area of the dial, and will be in its full open position when the pointer is at the "TC' position on the dial. But in the continued turning of screw 2M counterclockwise, the valve I55 will be moved in closing direction, during travel of pointer 236 over the thermo-control area of the dial, and when the pointer reaches a position slightly beyond the MB position on the dial,

a snap action and remains closed during the resetting operation, as previously described. That eliminates possibility of flow of fuel to the main burner until the resetting operation has been completed, even though valve I55 be reopened, since no fuel can enter housing 35 until the safety shutoff valve 48 has been opened and opening of valve I55 during the resetting operation is prevented, as has been explained.

It will be understood that the range or extent of movement of the adjusting screw 2M for effecting the various conditions above referred to may be varied considerably by altering the proportions of the various parts of the control device and, therefore, are used for purposes of description only and are not in any sense limiting. In any event, however, continuous movement of the adjusting screw in one direction, that is, clockwise direction as viewed in Figure 10, effects the several conditions of the control means in successive order, which is conducive to simplicity and accuracy in operation. It is also possible, by means of this adjusting screw, to place the main burner valve under either thermal control or manual control, as desired, and to effect the tripping operation and the resetting operation of the safety shutoff valve, in the manner described.

The thermostat means of Figure 3 may be replaced by the thermostat means of Figure 8, for regulating flow of fuel to the main burner responsive to temperature variations at a point remote from the furnace. In that respect, it will be understood that the bulb 261 of the thermostat means of Figure 8 may be disposed at any suitable location remote from the furnace and within a room or space to be heated by the furnace, the main burner valve I55, when under control of the thermostat means, regulating flow of fuel to the main burner in accordance with temperature variations to which the bulb 261 is subjected. Since the operation of the control may be resorted to without departing from the,

field and scope thereof, and I intend to include all such variations, as fall within the scope of the appended claims, in this application in which the preferred forms only of my invention have been disclosed.

I claim: v

1. In control means of the character described, a housing having an inlet and an outlet, a safety shutoff valve controlling said inlet, condition responsive means for holding said valve open responsive to a first condition and closing it responsive to a second condition, a second valve controlling said outlet, thermoresponsive means, and adjusting means comprising connecting levers between said valves whereby said adjusting means is effective for optionally placing said second valve under control of said thermoresponsive means and under manual control in the normal operating condition of said control means with said safety shutoff valve held open.

2. In control means of the character described, a housing having an inlet and an. outlet, a safety shutoff valve controlling said inlet, condition responsive means for holding said valve open responsive to a first condition and closing it responsive to a second condition, a second valve controlling said outlet, thermoresponsive means, and adjusting means. comprising connecting levers between said valves whereby said adjusting means is effective for optionally placing said second moved in the other direction for successively valve under control of said thermoresponsive.

. means and for moving said second valve in closing direction independently of said thermore-" sponsive means in the normal operating condition 4 of said control means with said safety shutoff valve held open.

3. In control means of the character described, a housing having an inlet and an outlet, a safety shutoff valve controlling said inlet and yieldingly urged in closing direction, electromagnetic means effective when energized for holding said valve in open position, a second valve controlling said outlet, a thermostat, adjusting means comprising connecting levers between said valves whereby said adjusting means is effective for optionally placing said second valve undercontrol of said thermostat and for moving said second valve in closing direction independently of said thermostat in the normal operating condition of said control means with said safety shutoff valve held Iopen, and means supplementary to said adjusting means effective for releasing said safety shutoff valve from said holding means when said second valve has been closed by said adjusting means and for resetting said safety shutoff valve to its levers between said valves whereby said adjusting member is effective for moving said safety shutoff valve from its closed position to its open position responsive to movement of said member in one direction and for thereafter successively ber in the normal operating condition of said control means with said safety shutoff valve held open, closing said second valve and releasing said safety shutoff valve from said holding means, in the movement of said adjusting member in its other direction.

5. In contol-means of the character described, a housing having an inlet and an outlet, a safety shutoff valve controlling said inlet and yieldingly urged in closing direction, electromagnetic means effective when energized forholding said valve in open position, a second valve controlling said outlet, a thermostat, adjusting means comprising an adjusting member movable in two directions, and connecting levers between said valves whereby said adjusting member is effective when moved in one direction for resetting said safety shutoff valve to its open position and effective when placing said second valve under control of said thermostat, under control of said adjusting mem:

ber in the normal operating condition of said control means with said safety shutoff valve held I open, closing said second valve and releasing said safety shutoff valve from said holding means.

6. Incontrol means of the character described, a housing'having an inlet andan outlet, a safety shutoif valve controlling said inlet, condition responsive means for holding said valve open responsive to a first condition and closing it responsive' to a second condition, a second valve controlling said outlet, thermoresponsive means, and adjusting means comprising connecting levers between said valves whereby said adjusting means "is effective for optionally placing said second valve --under control of said thermoresponsive means and under manual control in the normal operation of said control means with said safety shutoff valve held open, and for releasing said open position independently of said second valve.

4. In control means of the character described, a housing having an inlet and an outlet, a safety shutoff valve controlling said inlet and yieldingly urged in closing direction, electromagnetic means effective when energized for holding said valve in open position, a second valve controlling said outlet, a thermostat, an adjusting member movable in two directions, and means supplementary to said adjusting member comprisingconnecting safety shutoff valve from said holding means and resetting said safety shutoff .valve from its closed position to its open position independently of said second valve.

'7. In control means of the character described, a housing having an inlet and'an'outlet, a safety shutoff valve controlling said inlet, yieldingly urged in closing direction, electromagnetic means capable when energized of holding said ,valve open, a second valve controlling said outlet, and adjusting means comprising an adjusting member movable in opposite directions from a predetermined'position and connecting levers between said valves whereby in said position of said member both of said valves are closed and movement of said adjusting member in one of said directions is effective for resetting said safety shutoff valve to its open position independently of .said'second valve and movement of said member in the opposite direction is effective for opening said second valve and continued movement of said adjusting member in said opposite direction is effective for closing said second valve, and thereafter releasing said safety shutoff valve from said holding means with resulting closing of said latter valve.

8. Incontrol means of the character described, a housing having an inlet and an outlet, a safety shutoff valve controlling said inlet yieldingly urged in closing direction, electromagnetic means capable when energized of holding said valve open, a second valve controlling said outlet yieldingly urged in opening direction, a thermostat, and adjusting means comprising an adjusting member movable in opposite directions .from a predetermined position and connecting levers between said valves whereby in said position of said member both of said valves are closed and movement of said member in one of said directions is effective for resetting said safety shutoff valve to'its open position independently of said second valve and movement of said member in the opposite direction is effective for opening of said second valve and placing it under control of said thermostat and continued movement of said member in said opposite direction is eifective for placing said second valve under control of said member and further movement of said member in said opposite direction is effective for closing said second valve and thereafter releasing said safety shutoff valve from said holding means with resulting closing of said latter valve.

9. In control means of the character described, a housing having an. inlet and an outlet, 2, safety shutoff valve controlling said inlet yieldingly urged in closing direction, electromagnetic means capable when energized of holding said valve open, a second valve controlling said outlet, a thermostat, an adjusting lever having a position in-which both of said valves are'closed and movable in opposite directions from said position, means comprising a manually operable adjusting member effective for adjusting said lever in either direction, and means whereby adjustment of said lever in one direction effects resetting of said safety shutoff valve to open position while preventing opening of said second valve during the resetting operation and movement of said lever in the opposite direction effects opening of said second valve and placing thereof under control of said thermostat.

10. In control means of the character described, a housing having an inlet and an outlet. a safety shutoff valve controlling said inlet yieldin ly urged in closing direction. electromagnetic means capable when energized of holding said valve open, a second valve controlling said outlet, a thermostat, an adjusting lever having a position in which both of said valves are closed and movable in opposite directions from said position, means comp ising a manually operable adjustin member effective for adjusting said lever in either-direction. and means whereby ad ustment of said lever in one direction effects resetting of said safety shutoff valve to open position while preventing opening of said second valve during the resetting operation and movement of said lever in the opposite di ection successively effects opening of said second valve and placing thereof under control of said thermostat. placing of said second valve under control of said lever, and closing of said second valve and thereafter mechanical release of said safety shutoff valve from said hold: ing means with resulting closing of said latter valve.

11. In control means of the character described, a housing having an inlet and an outlet, a safety shutoff valve controlling said inlet yieldlngly urged in closing direction, electromagnetic means capable when energized of holding said valve open. a second valve controlling said out let yieldingly ur ed in opening direction. a thermostat, an adjusting lever, connections between said lever and said second valve and said thermostat effective for causing closing of the latter and opening thereof under control of said thermostat responsive to adjustment of said lever, a-

safety shutoff valve reset and release lever having lost motion connection to said adjusting lever, said latter lever having a position in which both of said valves are closed and being movable in opposite directions from said position, and means for adjusting said adjusting lever in opposite directions, said connections comprising means whereby movement of said adjusting lever in one direction effects resettin of said safety shutoff valve to open position while preventing opening of said second valve during-the resetting operation and movement of said adjusting lever in the other direction effects opening of said second valve and placing thereof under control of said thermostat.

12. In control means of the character described, a housing having an inlet and an outlet,

a safety shutoff valve controlling said inlet yield-' ingly urged in closing direction, electromagnetic means capable when energized of holding said valve open, a second valve controlling said outlet yieldingly urged in opening direction, a thermostat, an adjusting lever adjustable in opposite directions, an operating lever connected to said second valve, a regulating lever pivoted on said adjusting lever subject to pressure exerted by said thermostat and bearin on said operating lever for urging said second valve in closing direction, a safety shutoff valve reset and release lever having lost motion connections to said adjusting lever, said latter lever having a position in which both valves are closed and being movable in opposite directions from said position, and means for adjusting said adjusting lever in opposite directions, the parts being so related that adjustment of said adjusting lever in one direction effects resetting of said safety shutoff valve to open position while preventing opening of said second valve durin the resetting operation and movement of said adjusting lever in the opposite direction effects opening of said second valve and placing thereof under control of said thermostat and continued movement of said adjusting lever in said opposite direction successively places said second valve under con- ,trol of said adjusting lever, closes said second valve and mechanically releases said safety shutoff valve from said holding means with resulting closing of said latter valve.

13. In control means of 'the character described, a housing having an inlet and an outlet, a safety shutoff valve controlling said inlet yieldingly urged in closing direction, electromagnetic means capable when energized of holding said valve open, a second valve controlling said outlet yieldingly urged in opening direction, a lever carrying said second valve, an operating lever for said second valve having lost motion connections to said carrying lever, an adjusting lever movable in opposite directions, means for adjusting said adjusting lever in opposite directions, a thermostat, means whereby both of said valves are closed in one position of said adjusting lever and movement thereof in one direction away from said position effects resetting of said safety shutoff valve to open position while preventing opening of said second valve during the resetting operation and movement of said adjusting lever in the opposite direction effects opening of said second valve and placing thereof under control of said thermostat, and means associated with said second valve operating lever for imparting theretov a snap action in its initial movement in valve opening direction and its final movement in valve closing direction whereby said second valve is opened and closed with a snap action.

14. In control means of the character described, a housin having an opening, a valve carrying lever, a valve carried by said lever controlling said opening, a valve operating lever having a depressed element and an element underlying said depressed element de-.

fining therewith a passage, a leaf spring extending through said passage with its ends remote therefrom and loosely connected .to said operating lever, means yieldingly urgin said operating lever upward, means for moving said operating lever downward, said underlying element having an opening therethrgugh, and an abutment member disposed to extend through said opening and cooperating with said depressed Q element to clamp therebetween the mid-portion of said spring as said operatin lever approaches the limit of its downward movement whereby the portions of said spring beyond said abutment member are flexed downward with a snap action and in the initial upward movement of said operating lever said portions of said spring are flexed upward with a snap action efiective for imparting a snap action to said operating lever in the .final downward movement and the initial upward movement thereof, and connections between said valve carrying lever and said operating lever for imparting to the former the snap actions of the latter.

LOURDES v. MccAn'rY