US2062262A

US2062262A - Control device

Info

Publication number: US2062262A
Application number: US461669A
Authority: US
Inventors: Earnest J Dillman
Original assignee: Detroit Lubricator Co
Current assignee: Detroit Lubricator Co
Priority date: 1930-06-17
Filing date: 1930-06-17
Publication date: 1936-11-24
Anticipated expiration: 1953-11-24

Description

Nov. 24, 1936. E. J. DILLMAN CONTROL DEVICE Filed June 17, 1930 2 Sh aufL eats-Sheet l 3' Figi.

33M 75;, Sum/mm3 NOV. 24, 1936. E: J. DlLLMAN `2,062,262

CONTROL DEVICE Filed June 17, 1930 2 Sheets-Sheet 2 Patented Nov. 24, 1936 A, UNITED STATES* CONTROL DEVICE Earnest J. Dillman, Detroit, Mich., assignor to Detroit Lubricator Company, Detroit, Mich., a corporation of Michigan Application June 17, 1930, Serial No. 461,669 26 Claims. (Cl. 236-92) My invention relates to new and useful improvements in control devices, andmore particularly to a device or apparatus having one or more means for automatically regulating or con-A tion is capable of usewith or embodiment in a multiplicity of diirent systems or apparatus, I have chosen, forthepurpose of Athese speciilcal tions, to disclose the same in cooperable relation .-1

with a-'refrigerating system or apparatus, preferably of the absorption type, the cycle of opera-1 tion of whichis well known in the art.

The invention consists in'. the improved con-` struction-and combinationof parts'and theiraggroupment in operative -re1ation,.all to be more fully .describedhereinaftenand the novelty of tinctly claimed. y

In the accompanying drawings, to be taken as` .'a part of these specicationa I have fully and clearly illustrated a preferred embodiment of my invention, in which drawings:

Figure 1 is a view in front elevation, partly.

diagrammatic, having certain parts broken away,

and being partly in vertical section, of an ap- Fig. 4 is an enlarged detail view of a partof an` 40 .element voff the control device.V

" Referring tov the"drawings lbyl characters ofl reference,"there are in'the system orfapparatus (Fig.I 1)V a Vgeneratv. a',.bso'rb'e'r A; a'condenser-B,` a refrigerant reservoir-0,' a flow ycontrol` means D, an evaporator and "'lrnyrv control device orfapi paratus Rf'all connecte'd`-'iin operative relation, :as ll Fig. 1. Vrotatable shafts journaled in the. member I and;,

,from passage.. 8 tofatmos'phcre is vrefrably '45' vided-.-

thecondenserBQrreIerably o fftbfaairgccled l,side wallsgand;

preferably divided into4 vertical flow passages 6,

'l and 8 by partitions, or the like, 9, I0 which terminate short of the top and bottoms walls, and 1 A which are in the respective planes of the substantially .alined openings 4, 5 and 4, 5e. Con- 5 trol means II, such as dampers, flap valves, or the like, are provided for each of the openings 4, l

4a and 5, 5a, which, when in open position,co operate with the partitions to close the passages 6,y and 8, and which whenin closed position provide ,10 for circulation from passage 1 to passages 6 and n 8 and then back `to passage 1, as is apparentfrom- The means I.I are preferablycarried by e having any suitable interconnectinglinkagel 2,415 whereby the means II are movable in unisonto@ open and to closed positions. Within thefpassagl "u 'l is a sealedcontainer means I3, which .prefer-15s 1 ably comprises a plurality of vertically p0Sii0I-1ed` i steel tubes having'headers, or .the like, .Il at top '20 and bottom, the .top header alone being shown, r

y y and which contains or is adaptedr to contain an which will be particularly'pointed out-and disabsorbent or adsorbentmedium, such, for` ,exf-y ample, as silica gel, or the like, designated .I 5, Sealed to 'and extendingfrom the top header- Irl- 25 is a conduit member I 6, serving as a common. f delivery .and return duct.- 1n the bottom wall 3 is an aperture I1 positioned beneath means I3 for admission to the interior of member I of a heating means I8, preferably a gas or other iiuid` 30k fuel main burner means supplied from any suitv able source by a conduit member I9 lhaving therein a flow control device or valve means 20, to be further described. The burnermeans I8 is preferably-provided with a pilot burner ZI'l fed 35 through a valve controlled conduit` member 22 v connected to' member ,|97 on the supply side of means 2li.Y Supported by the top wall,2 is a drive l means 2| preferably an electric motor, having its A fg driveshaft 23 vertically positioned' and extending 40 at its' lower end throughl the wal1y`2 intqpalssage `l On the topjancibottom end spf the shaft arelysecured fanfmeanslzl, 25, respectively, for creatingfa forcedlgas 4flow? A

yvent pipe

2,6; opening 7when.;s;costume@ruraux-wer there inlet endof the condenser Bis a conduitI member 28 which connects into a valve casing 29 and through a check valve 36 therein to the conduit member I6, the valve 36 opening toward the condenser B.

From the lower outlet end of the condenser B extends a conduit member 3| in which isa check valve 3|a closing toward the condenser B and which leads to the flow control means D. Positioned in the conduit member 3| is the refrigerant medium receiver C. The means D is prefera check valve 34 therein to the conduit member I6, the valve 34 opening toward the member.|6. The refrigerant medium which passes through conduit members |6, 28 and 33 is substantially in the vapor state, and these members are `therefore preferably of larger diameter bore than members 3| and 32 which convey the medium in liquid state.

Mounted on brackets,` or the like, on the front wall of member is the control device F, which preferably has a substantially rectangular supporting framework 34B having top and bottom frame members. 35, 36 and

end frame members

31, 38. Rigidly secured in an aperture in the bottom member 36 and depending therefrom, is the valve means 26 having a port 39 with which cooperates a reciprocable valve member 46 carried by a stem 4l having a sliding ilt in and extending up through a Aguide aperture in the valve bonnet 42. Between and secured to the top and

bottom members

35, 36 is a substantially vertical supporting frame member 43 vhaving a horizontal guide aperture 44 therethrough adjacent its mid-portion. Extending through theaperture 44 is a reciprocable thrust member or plunger 45 carrying thereon a slidable sleeve member 46, preferably of brass,having guided bearing in the aperture 44. .Intermediate its ends the plunger 45 is screw threaded and adjustably carries an operating nut or trip member 41 for a purpose to be described, and which also serves to limit movement of said sleeve member 46 in one direction. Movement of member 46 in the opposite direction is limited by a collar or stop member 48 rigid with plunger 45, and preferably seatedin a circumferential groove therein. .Movable relative to member 46 and carried thereby, is an abutment or operating member 449, preferably an annulus of hardened tool steel having sharp, marginal edges on its inner circumference, as at 56, 5| (see Fig. 3). The member'49 is of slightly larger internal diameter than the external diameter of member 46, so that when tilted from a plane substantially normal to the longitudinal axis of plunger 45, the edges 56, 5| of member 49 will bite into member 46 and cause member 49 to move positively therewith. Normally acting on the member 49 is a resilient means 52 tending to slide member 49 along member 46 from left to right of Figs. 2 and 3 and toward'frame member 33. The means 52 is preferably a leaf spring member fixed, as at 53, to framemember and bifurcated at its upper free end so as to` pass to each' side of member 43 and engage abutment member 43 at opposite points adjacent its horizontal diameter. Extending rigidlyr from frame member 43 toward frame member 33 below and substantially equidistant laterally from member 46, are supporting arm members 54 having a substantially horizontal bearing pin or rod member 55 extending rigidly therebetween. Pivotally supported on pin 55 is a lever member or means 56 extending toward frame member 38 and having substantially parallel, horizontally spaced

ann portions

51, 58 through which are alined bearing apertures 59 receiving the pin 55. Connecting the

portions

51, 58 is a tranverse or base portion 66 from the to'p and bottom edges of which members 6|, 62, respectively, extend toward frame members 38 in substantially parallel relation. The members 6|, 62 extend through an aperture 63 in a substantially vertical bracket member 64. The bottom edge 65 of aperture 63 cooperates with member 62 to limit or Astop downward movement of means 56. 'I'he

arm portions

51, 58 are joined above pin 55 by a pin or rod 66 which is positioned just under sleeve member 46 and for engagement by the abutment member 49 upon its movement from left to right of Figs. 2 and 3. At its top the bracket member 64 has a lateral extension or arm 61 which overlies the member 6| and through which is adjustably threaded a stop screw 68 cooperable with member 6| for regulating and limiting the permissible upward movement of means 56. Extending in prolongation of and substantially horizontally from the top of arm portion 51, is an operating arm or member 69 which passes through an aperture 16 in end frame member 36, and has pivotally secured on its free end, as at 1I, and adjustr able link or rod 12 which connects to the damper operating linkage l2, and preferably to one of the inlet opening damper shafts. Also fulcrumed on pin 55 between

arm portions

51, 58, is a lever or lifting member 13, preferably comprising substantially parallel rigidly connected arms 14 of substantially triangular form, having their bases preferably substantially vertical and their apices apertured to receive the pin or shaft 55. I'he upper ends of arms 14 extend on opposite sides of plunger 45 and in proximity thereto, and terminate in lingers or trip members 15 substantially at or above the contact points between leaf spring 52 and member 49 for engagement with the abutment member 49 to disengage the same from biting engagement with sleeve member 46.

'I'he member 13 also acts upon upward counterclockwise movement about pin 55 to engage pin 66 subsequent to engagement of fingers 15 and members 49 to lift or rotate lever means 56 counterclockwise of Fig. 2. In opposing relation to the s top member 62 which extends beyond member 6 I, is a substantially horizontal lever member 16 which extends over the valve stem 4| and freely .through an aperture 11 -in frame member 38. The member 16 is provided with knife-edge fulcrum portions 18 which'engage they inside face of member 36. Interconnecting and pivoted to the member 16 and stem 4| is a link, or the like, 19 which serves to transmit motion from member 16 to the valve member 46. The

members

62 and 16 terminate in conical points 86, 8|, respectively, which seat in bearing recessesin

spring follower members

32, 33 between which and held under compression thereby is a resilient means 34, preferably a coil spring. The screw 63 is preferably so adjusted and the length of link 16 is such that when the lever means 53 is in upper position and valve 23 is closed, as in Fig. 2, the point 33 will 'be very slightly above the line of points 55 and 3|. that is, the toggle joint will be. brokenv upward slightly. Rigidly supported on the lever member 16 and extending at an inclinationupward therefrom, is an abutment arm`85.:

Secured to and depending from the top frame and from which depends a rod member 99 cooperable `with arm 85 to depress the same.

Positioned between

members

35 and 88 is a coil spring, or the like, 99 under compression and normally tending to force member 89 into engagement with arm 85 to close valve 29. The

spring 99 is opposed and normally held ,inactive 'by pilot burner responsive means 9| which has a bulb element 92, see Fig. 1, charged with a heat responsive medium and positioned to be heated by the name of pilot burner 2 I. Extending from element 92 is a conduit 93' which connects into casing 94 secured to the top frame member 35 above lever member 88 and on the opposite side of its fulcrum from spring 99. The casing 94 is sealed by resilient means (not shown), such as a metal bellows, which carries a plunger engaging the lever member 88 on the opposite sideY of its fulcrum from spring 99 so that the presence of a proper pilot burner name will maintain member 99 in the position of Fig. 2. Pivotally setemperature, and which` comprises. a casing |99 sealed by resilient means |9I, preferably afmetal' bellows, having fixed thereto a plunger |92 oper-` atively4 connected to plunger 91. (Within the bellows |9| varound plunger |92, is a coil spring, orv j the like, |93 under compression and whichyseats against the bellows head and the nut 98, and by` which the response of the responsive means may be regulated. Leading from thechamber |94 within the casing |99, is a conduit |95 having sealed-to its free end a. bulb element, or thev like, |95l charged with aisuitable expansive medium and positioned -within the generator-absorber passage 1so that upon occurrence of a predetermined temperature or variation in temperature of the heating gases in passage 1, the element 99 will be actuated to force the plunger 91 andrlifting member 13 upward. frame member 31 is a power element |96 having a casing |91 within which is a plunger |98 in substantialalinement with plunger 45 and oper-` atively connected thereto. 'I'he plunger |98 is carriedby resilient means |99, preferably al metal bellows, whichseals Vthe casing |91. Within the bellows |99 is a coilspring |I9 under compres;

tured nut 'I I Iwhich is adjustabiy vscrewedinto the frame .member 31.- The element- |96 com.,- ,prises part-oa means responsive to. variaionina f uid ,.characteristic; I preferably pressure, 1 andi Presme-a Y hascaconduit@Il aconnecting the-chambers; |I. with`in`1 theicasing; I91;;tofthe.refrigerant medium f return:l conduit.: member 33.3, kE oslt-ionei'l onthe La' .top `Offthe 'top framemember-:BSJS nfeleelie;

4 preferably fifths-en closed; 9.1.

Secured to the end a enpmembe; lazo which 1s lpivotally supported on'a pin- I 2| carried bya bracket |22 topermit rocking or tilting movement of the tube to ow th'e mercury to-and from the contacts. rThe tube ||1 is 'counterweighted by a member |23 which tends to maintain the motor circuit closed; Projecting fromthe clip member |29 isa lug I 24 in the ypath of movement of one end of a lever arm |25 which passes downward through an aperture |26 in the top frame member 35, and which is fulcrumed intermediate its ends on a bracket supported pin '|21. extends to the left of and into cooperable relation with the plunger carried trip member 41, so

.that movement of plunger 45 from right to left of Figs. 2 and 3 acts to break the circuit of motor 2| within tube I|1.

The operation c-f my control device orapparatus as embodied, for example, in a refrigerating system of the absorption type, lwill now be described, it beingunderstood that the control device is capable of embodiment in other systems and for controlling other means. In the drawings, the positions of the various elements of the system are such as occur on'the completion of a heating cycle, and after the generatorabsorber A has been cooled somewhat. Con-` tinuing from this point in a cycle of operation, the functioningof ythe system lunder command of my control device is as follows: The heat given` off fromthecontainer means in passage 1 will cause a natural upward `iow of cooling gases or shown and the mainlvburner I8 having -been ex- The other end of arm |25 soI tinguishedf K The temperature at the evaporator E 'willbe ,above the predeterminedlow limit for which the power element |96 is set, and therefore pressure ,ofv4 the vaporizedrefrigerant medium, such, for example, as sulphur dioxide, in the conduit member 33 acting on the resilient chamber sealing means |99 will have moved the intercon nected plungers |98 and 45 to the right of Figs. 2 and 3 at the start of the now completed heat ing cycle. The plunger 45 carries the nut or trip member 41 which on movement of plunger 45 to the right of Figs. 2 and 3 will have'v released switch tube I I1, permitting the weight member |23 to tilt the same clockwise on its pivot I2I to energize the fan motor 2|. The fan 25 driven by motor- 2| will create a forced upward draft through passage 1, increasing the rate of cooling of the lgenerator-absorber and container means j I3. The cooling of the means|3 will reduce the pressure therein, causing the liqueed refrigjl erant medium in the evaporator E to vaporize and passl back through conduit member 3.3, the check valve 34 and conduit member I6 to -'the container means I`3,fflor absorption or adsorpt'on by the. vvmediunfl ,liihereinz As #he levwrwfp; cools, y due to A the vaporization of the refrigerant Q mediu ni,`l thelpressure v,chsara'ct'erist.ic' of vthe 4fva'- the lever means 56. When the absorbing or adsorbing power of the medium I5 in container means I3 has been substantially satisfied, the pressure in conduit member 331 will continue to increase beyond the pressure which will start motor means 2|, 'and regardless of the increased ow by the fan 25 of cooling air which will now continue until the evaporator is again cooled down as above described. 'I'he limiting stop or nut 41 will take up the play betweenplunger 45 and sleeve 46, causing the abutment or ring member 49 to engage the cross pin or member 66. Continuation of the movement of plunger I 08 and 45 to the right of Figs. 2 and 3 will cause the ring member 49, backed up by leaf spring 52, to tilt from the normal to plunger 45 into biting or gripping relation to sleeve 46, as in Figs. 2 and 3. When the ring member 49 has been tilted and tightly grips the sleeve 46 then movement of plunger 45 to the right will act through this established positive engagement with 'lever means 56 to rotate or move the same clockwise about its pivot pin 55, which will initiate the heating period. As above noted, the break point 60 be- 'tween means 56 and spring 64 is very slightly above and overcenter, andtherefore the movement of plunger 45 necessary to carry point 60 through center is very slight. As the point 60 crosses center, the compressed spring 64 will act with an increasing component to force the lever means 66 and arm 69 downward and clockwise about pin 55 into engagement with stop 65. The downward movement of point 60 carries it across the line of points 6|, 16, so that the spring 64 will react with an upward component on the lever 16, swinging the same clockwise of-Fig. 2 about its knife edgevfulcrum 16. The upward movement of lever 16 istransmitted through link 19 to valve stem 4| to open valve 20 and permit fuel to ilow to the main burner means I6. The fuel supplied tomeans I6 will be ignited by the pilot burner 2 I. Should it happen that the pilot burner ame. is insuflicient to heat the bulb element 92, then the spring 90 will have acted through arm 66 to hold the valve member 40 on its port 39 against the lifting component of force of spring 64, and thus prevent flow of fuel toy the burner means I9. It is of course understood vthat the bulb *element 92 and responsive means 9| comprise a safety devie, which on'failure, or substantial failure, of the pilot burnerflame will act Ato close the valve 20 or to extinguish the main burner means I6 and stop operation of the system.v The downward movement of lever arm 69, as above described, actsthrough the rod 12 and linkage I2 to operate the damper meansv |I to close the inlet openings 5, 5l and the outlet openings 4, 4*. The Agases within casing member I which are heated by means I6, will rise over the container means I3 and be forced by the running fan 26 to travel down the

passages

6 and 6 for continuous recirculation and heating. During the heating period, refrigerant medium in the vapor state will be driven of! from the absorbent or adsorbent medium within container means I3', and will pass through top header I4 to conduit member I6. The check valve 34 will direct the flow through conduit member 26, past check valve 30, to the condenser B. The motor means 2| which is constantly energized during the heating period, will also drive fan 24, which will force cooling air upward over the condenser B to cool and liquefy the' refrigerant medium supplied thereto. The liquefied medium will pass through the valve controlled conduit member 3| to the evaporator E, any surplus being stored in the receiver C until permitted by the ow control means D to enter the evaporator E via the conduit member 32. When the recirculating gases within the housing member I have been heated to a predetermind degree, say, about 400 F., substantially all of the refrigerant medium will have been driven off from the absorbent or adsorbent medium I5 in container means I3` and have passed to the condenser B. Upon the temperature within the generator-absorber reaching the desired degree, the uid within the bulb element |05 of the responsive means will have acted upon the resilient sealing means |0| to force plungers |02 and 91 and the lifting member 13 upward. As the lifting member 13 moves upward, the upper inclined edges of the arms 14 will engage 'the underside of cross-pin 66 and lift lever means 56 upward, or counterclockwise, about its fulcrum 55 against the force of spring 64, until point 80 crosses center, when spring 60 will snap the lever means 56 up against stop screw 66. During the latter part of the upward movement of lifting member 13, the fingers 15 thereof will engage the ring member 49 and turn it back to substantially vertical position as it fulcrums on the.

leaf spring 52, and will then slide or move it toward the left of Figs. 2 and 3 against the force of spring 62 and along sleeve 46, so that it will be out of the way of the cross-pin 66 and not stop or hinder upward movement of lever means 56. The valve -20 will be snapped closed by the force of spring 64 as point 60 passes through the extended line of points 6|, 16, which operation starts the cooling period in the cycle. The

damper arm 69, which is moved upward with l lever means 56, acts through'rod 12 and linkage I2 to operate the damper means |I to open inlet openings 5, 6* and outlet openings 4, 4l, closing

passages

6 and 6. The fan 25 will continue in operation, cooling the container means I3 and 'the atmosphere in passage 1. As the temperature in passage 1 decreases, the fluid in bulb element |05'L will contract, permitting spring |03 in the power element 99 to move connected plungers |02l and 91 and lifting means 13 downward to the position shown in Fig. 2, thus completing a cycle of operation of the system and of the convtrol device.

It may be noted thatthe spring 52 will return the abutment member 49 to the right along sleeve 46 to its operative location as the lifting means 13 and ngers 15 are retracted. It may also be noted that the cooperating sleeve 46 and annulus 49 permit a very sensitive operation as the annulus is operable to grip tightly the sleeve 46 anywhere within the length of the sleeve.

of the system with the evaporator substantially at room temperature, there may be several cycles during which the motor means 2| will operate continuously, because the temperature of the evaporator E may not drop suiiiciently in the first few cycles to permit spring ||6 to retract plunger 45 far enough to the left to tilt tube ||1 and' break the motor circuit.

4movable relative thereto and normally establishing cooperable relation between said members whereby said responsive means may move said control device in one direction, and a second means responsive to a fluid characteristic and operable to engage one of said members to move said control device in the opposite direction, said second-named responsive means being operable to move said establishing means out of cooperable relation between said members when said second-named responsive means acts to move said control device.

2. Ay control apparatus of the character de-4 scribed, comprising a movable control device,

one direction, a second means responsive to a fluid characteristic and having means to engage and transmit movement to said lever means to move said control device in the opposite direction, and means-operable to move said establishing means relative to said member to pr`event opposition by said first-named responsive means to movement of said lever means when said second-named responsive means acts to move said lever means.

3. A control apparatus of the character .described, comprising a movable control device, lever means for actuating said control device, means responsive to a fluid characteristic and having a reciprocable member for moving said lever means in one direction, an abutment member movable relative to said reciprocable member and normally having a position to transmit motion from said reciprocable member to said lever means, a second means responsive to a uid characteristic and having means to engage said lever means to move said levermeans in the opposite direction, and means actuated by said second-named responsive means to move said abutment member out of motion-transmitting position when said second-named responsive means acts -to move said lever means.

4. A control apparatus of the character described, comprising a movable control device, .means responsive to -a fluid characteristic and having a reciprocable member, lever means for actuating said device, means carried by and movable relative to said member and having a normally operable position for engaging said lever means whereby to transmit motion from said responsive means to said device. and a second means responsive; to a uid characteristic and operable to engage said lever means to actuate said device, said second-named responsive meansv acting to move said movably carried means out of operative position upon movement of said lever means whereby to prevent opposition by said actuating said device, means slidably carried by said member for engaging said lever means, means normally acting to maintain said slidable means rigid with said member whereby to transmit motion from said responsive means to said device, and a second means responsive to ya fluid characteristic and operable to engage said lever means to actuate said device, said second-named responsive means actingto release said slidable means from said reciprocable member'upon movement of said lever means t'whereby to prevent opposition by said rst-named responsive means to movement of said device.

6. A control apparatus of the character described, comprising means responsive to a uid characteristic, a thrust member operatively connected to said means for movement thereby, means opposing movement of said thrust member, switch means, means to' transmit motion from said thrust member to said switch means whereby said responsive means is operable to make and break circuit at said switch means, a control device, and means to transmit motion from said thrust member to said control device whereby to operate said device, said last-named means being operable to move said motion transmitting means to actuate said switch without movement -oi said transmitting means being transmitted to said control device until hsaid switch has been actuated.

'7. A control apparatus of the character described, comprising means responsive to a fluid characteristic, switch means for controlling an electric circuit, a control device movable to two positions, and means operable by said responsive and said device, an abutment member movable relative to said members and operable to transmit movement from one of said members to the other of said members whereby said power means is operable to move said control device in one direction, and a second power means responsive to a fluid characteristic and operable to move said control device in the opposite direction, means resisting movement of said device in said opposite direction, said second-named power means acting to move said abutment member out of motion transmitting position and to overcome said resisting means whereby said second-named power meeans can move said control device.

9. A 'control apparatus of the character described, comprising a movable control device, power means responsive to a uid characteristic, a .pair of members cooperable with said means and said device, an abutment member movable relative to said members and, operable to transmit movement from one of said members to the other of said members whereby said power means is operable to move said control device in one direction, a second power means responsive to a fluid characteristic land operable to move said control device in the opposite direction, means resisting movement of said device in said opposite direction, vsaid second-named power means acting to move said abutment member out ofh motion tr-ansmitting position and to overcome said resisting means whereby said second-named power means can move said control device, electrically energized means, a switch controlling said electrically energized means, and means operatively connecting said first-named power means and said switch.

10. A control apparatus of the character described, comprising a movable control device, power means responsive to a fluid characteristic, a pair of members cooperable with said means and said device, an abutment member movable relative to said members and operable to transmit movement from one of said members to the other of said members whereby said power means is operable to move said control device in one direction, a second power means responsive to a iluid characteristic and operable to move said control device in the opposite direction, means resisting movement of said device in said opposite direction, said second-named power means acting to move said abutment member out of motion transmitting position and to overcome said resisting means whereby said second-named power means can move said control device, a third power means responsive to a iiuid characteristic, and means for transmitting motion from said third-named power means to said control device, said third-named power means being operable to move said control device to or to hold said, control device in given position irrespective of operation of said first-named or said second-named power means.

11. A control apparatus of the character described, comprising a movable control device, power means responsive to a iiuid characteristic, a pair of members cooperable with said means and said device, an abutment member movable relative to said members and operable to transmit movement from one of said members to the other of said members whereby said power means is operable to move said control device in one direction, a second powermeans responsive to a iiuid characteristic andl operable to move `said control device in the opposite direction, means resisting movement of said device in said opposite direction, saidsecond-named power means acting to move said abutment member out of motion transmitting position and to overcome `said resisting means whereby said second-named power means can move said control device, a control means, and means operatively connecting said Vcontrol means to one of said cooperable members for movement thereby.

l2. A control apparatus of the character described, comprising a movable control device, lever means for actuating said control device, means responsive to a uid characteristic and having a reciprocable member for moving said lever means in one direction, an abutment member movable relative to said reciprocable member and normally having a position to transmit motion from said reciprocable member to said lever means, asecond means responsive to a iiuid characteristic and having means to engage said lever means to move said lever means in the opposite direction, means actuated by said second-named responsive means to move: said abutment member out of motion-transmitting position whensaid.

second-named responsive means acts gto move said lever means, a switch movable to open and closed positions, and means operatively connect-l ing said reciprocable member and 'said switch.-

13. A control apparatus of the character` described, comprising a movable control device,

'lever means for actuating lsaid control device,

means responsive to a iiuid characteristic and having a reciprocable member for moving said lever means in one direction, an abutment member movable relative to said reciprocable member and normally having a position to transmit motion from said reciprocable member to said, lever means, a second means responsive to a iluid characteristic and having means to engage said lever means to move said lever means in the opposite direction,` means actuated by said second-named responsive means to move said abutment member out of motion-transmitting position when said second-named responsive means acts to move said lever means, a switch movable to open and closed positions, means operatively connecting said reciprocable member and said switch, a control means, and means operable by said reciprocable member to actuate said control means.

14. A control apparatus of the character described, comprising a movable control device, lever means for actuating said control device, means responsive to a iiuid characteristic and having a reciprocable member for moving said lever means in one direction, an abutment member movable relative to said reciprocable member and normally having a position to transmit motion from said reciprocable member to said lever means, a second means responsive to a fluid characteristic and having means to engage said lever means to move said lever means in the opposite direction, means actuated by said second-named responsive means to move said abutment member out of motion-transmitting position when said second-named responsive means acts to move said lever means,a switch movable to open and closed positions, means operatively connecting said reciprocable member and said switch, a control means, means operable by said reciprocable member to actuate said control means, a third means responsive to a fluid characteristic, and means operable by said thirdnamed responsive means to actuate said control device irrespective of operation of said secondnamed responsive means.

15. A control apparatus of the character described, comprising a control device movable in opposite directions, snap-acting means to move said device and including a lever, means responsive to variation in a fluid characteristic, means for transmitting motion from said responsive means to said lever to snap said device in one direction, va second means responsive to' variation in a fluid characteristic, means for transmitting movement from said second-named responsive means to said lever to snap said device in the opposite direction, and means supported by and movable relative to one of said transmitting means to operatively connect one of said transmitting means to said lever, the other oisaid transmitting means acting to move said connecting means out of operative relation to said one transmitting means whereby said other transmitting means can move said lever.

16. A control apparatus of the character described, comprising a movable control device, means responsive to a fluid characteristic. a

pair of members cooperable with said means and trol device in the opposite direction, said second-named responsive means being operable to move said establishing means out of cooperable relation between said members when said second-named responsive means acts to move said control device, a movable switch means, and means operable by said first-named responsive means to actuate said switch means.

17. A controlapparatus of the character described, comprising a movable control device, means responsive to a uid characteristic, a pair of members cooperable with said means and with said device, one of said members having means movable relative thereto and 'normally establishing cooperable relation between ,said members whereby lsaid means may move said control device in one direction, a second means responsive to a uid characteristic and operable to engage one of said members to move said control device in the opposite direction, said second-named responsive means being operable to move said establishing means out of cooperable relation between said members when said second- .named responsive means acts to move said control device, a movable switch means, and means to actuate said switch means, said one member having means cooperable with said actuating means whereby said first-named responsive'means is operable to actuate said switch means.

18. A control apparatus of the character described, comprising a control device movable in opposite directions, means responsive to a iiuid characteristic for moving said control device in one direction, safety means for moving said con'- acteristic, andmeans operatively connecting said second responsive means and said control device whereby said second responsive means is movable to move said control device in said opposite direction. i

19. A control apparatus of the character described, comprising a control device, means responsive to a uid characteristic, an voperating means interconnecting said responsive means and said control device, a second control device, means operatively connecting said operating means and said second control device, an operating arm movable by said operating .means and operable to actuate a' control means, a second means responsive to a uid characteristic, means operatively connecting said second responsive means to said rst-named controldevice and to said arm, and safety means responsive to a fluid characteristic and operable to actuatesaid firstnamed control device.

20. A control apparatus of the character described, comprising a control device, means responsive to a iiuid characteristic, an operating "eis operable to actuate said first-named control device without opposition by said first-named responsive means.

2l. A control device of the character described, comprising means responsive to a iiuid characteristic, switch means for controlling an electric circuit, a control device, a motion transmitting member operable by said responsive means for actuating both said switch means and said control device, and a releasable operating member forV establishing operative connection between said motion transmitting member and said control device after actuation of said switch means by' movement of said motion transmitting member in one direction whereby said switch means and said control device are actuated independently of each other.

22. In a control apparatus of the character described, a movable controlling means, a movable controlling means for controlling operation of said first-named controlling means, said sec-V ond-named controlling means having operative connection with said rst-named controlling when said second-named controlling means is moved in an opposite direction, means responsive to a iluid characteristic and operable to move said second-named controlling means in one direction, releasable mea-ns movable relative to said responsive meansv and operable to establish conn ection between said responsive means and said second-named controlling means so that said responsive means can move .said second-named controlling means, a second means responsive to a fluid characteristic for moving said secondnamed controlling means in the opposite direction, and means operable to move said releasable means relative to said iirst-named responsive means to disengage said first-named responsive means and said second-named controlling means to prevent opposition by said rst-named responsive means, to movement of said-secondnamed controllingl means by said second-named responsive means.

23. In a control apparatus of the character described, 'a movable controlling means, a movable lever member for. controlling operation of said controlling means, said controlling-means and said lever memberibeing arranged so that said controlling means will be moved to one position when said lever member/is moved in one direction and will be movedfto a second position when said lever member is moved 'in the opposite directionf means responsive to a fluid i characteristic and operable4 to move said lever lmember in said one direction, a second means responsive to a iluid characteristic and operable to move said leverpmember in said opposite direction, means vmovable relative to said respon- `sive means and operable upon movement of said responsive means in -one direction to establish connection between said lever-member and said first-named responsive means so that said first-.fv

namedjresponsive .means can move said lever member "t move said controlling means, and means operable to disengage said rst-,named responsive means, and said lever member to prevent opposition by said first-named responsive means control device', and lost-motion means interposed tomovement of said lever member when vsaid second-named responsive means acts to move said lever member.

24. In a control apparatus of the character described, a vreciprocal valve member for controlling flow of a fluid, a lever member controlling operation of said valve member, said valve member and said lever member being arranged so that said valve member is moved to closed position by movement of said lever member in one direction and moved to open position by movement of said lever member in the opposite direction, power means responsive to a fluid characteristic and operable to move said lever member in said one direction, said power means having a movable member, means movable relative to said movable member and operable to releasably establish connection between said movable member and said lever member so that said power means can move said lever member, power means responsive to a fluid characteristic for moving said lever member in said other direction, said second-named power means having a movable member for moving said lever member, means operable to move said releasable connecting means relative to the movable member of said first-named power means to disengage the movable member of said rst-named power means and said lever member to prevent opposition by said first-named power means to movement of said lever member when said secondnamed power means acts to move said lever member, and yieldable means acting to maintain engagement between the movable member of said rst-named responsive means and said lever member.

25. In a control apparatus of the character described, a valve for controlling ow of fuel toa burner, a snap-acting lever for actuating said valve, means responsive to variation in a fluid characteristic and controlling movement of said valve toward open position, means responsive to variation in a second uid characteristic and controlling movement of Asaid valve toward closed position, cooperable' motion transmitting members for. positively transmitting the force of said first-named responsive means to said lever, means operable to hold one of said transmitting members in position for engagement with the other of said members upon operation oi' said rst-named responsive means, said secondnamed responsive means being engageable with said lever for positively moving said lever, and means to move said transmitting members out of engaging relation such that said rst-named responsive means will not oppose operation of said lever by said second-named responsive 26. A control device comprising a supporting structure including a valve casing, a valve member movably supported in said casing, a lever cooperable with and controlling the operation of said valve member, a spring engaging said lever and movable over-center to move said lever with a snap-action, a pressure responsive element carried by said structure, a plunger rod extending from and movable by said element,

a pair of cooperable members for transmitting motion from said rod to said lever, one of said cooperable members being carried by said lever, the other of said cooperable members being movable by said rod, a leaf spring having one end xed to said structure and being engageable with one of said cooperable members to hold said cooperable members in motion transmitting engagement on movement of said rod.

EARNEST J. DILLMAN.