US867355A - Safety device for heaters. - Google Patents

Description

No. 867,355. PATENTED OCT. 1, 1907. I. FILSON.

SAFETY DEVICE FOR HEATERS.

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' Witness PATENTED OGT. l, 1907.

' v I. FILSON.

SAFETY DEVICE FOR HEATERS.

APPLICATION FILED MAY 28. 1906.

6 SHEETS-SHEET 2.

' -%T J w THE NORRIS PETER: co, WASHINGTON, n z:

No. 867,355. PATENTED OCT. 1, 190v. 1. FILSON.

SAFETY DEVICE FOR HEATERS.

APPLICATION FILED my 2a. 1906.

6 SHEETS-SHEET 3.

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1w: owns PETERS 41., WASHINGTON, a c

PATENTED OCT. 1, 1907.

I. PILSON. SAFETY DEVICE FOR HEATERS.

APPLIOATION FILED MAY 28, 1906.

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galvanic;

Witnesses I arm,

1n: nouns PITERS co. WASHINGTON. p. c.

No. 867,355. PATENTED 00w. 1, 1907.

. I. FILSON.

SAFETY DEVICE FOR HEATERS.

APPLICATION FILED MAY 28 1906.

6 SHEETS-SHEET 5.

Svwewtoz F a RZSorg witnesses mat-MW, Z Q I flmw ms NORRIS PETERS 1:17., WASHINGTON. n, c

No. 867,355.. PATENTED OCT. 1, 1907. I. FILSON.

SAFETY DEVICE FOR HEATERS.

' APPLICATION FILED MAY 26. 1906.

6 SHEETS-SHEET 6.

gave/Mot lifl/ 1 018020, witnaaaeo v THE namus PETERS cm, WASHINGTON, 04 c4 OFFICE.

IRA FILSON, OF SPRINGFIELD, OHIO.

SAFETY DEVICE FOR HEATERS.

Specification of Letters Patent.

Patented Oct. 1, 1907.

Application filed May 28, 1906. Serial No. 319,129.

To all whom it may concern:

Be it known that I, IRA FILsON, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Safety Devices for Heaters, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to safety devices for heaters, and is designed more particularly for use in connection with heaters using gas as a fuel. Natural gas is very largely used for this purpose, and is frequently subject to great variations in pressure, which sometimes extinguish the fires when the pressure falls, causing danger of asphyxiation and explosion when the pressure again rises, and which sometimes cause overheating, with its attendant dangers of fire, when the pressure rises too high.

It is the object of my present invention to provide a safety device for use in connection with a gas heater which will serve, in its most highly developed form, to not only give a warning signal, but also positively shut off the supply of gas, in case the temperature of the heater rises above or falls below certain predetermined but adjustable limits.

To these ends my invention consists'in certain novel features which I will now proceed to describe, and will then particularly point out in the claims. 7

In the accompanying drawings, Figure 1 is a'perspcctivc view of an appartaus embodying my invention in one form; Fig. 2 is a detail front elevation of the shutoff mechanism; Fig. 3 is a side elevation of the same, partly in vertical section; Fig. 4 is a detail top plan view of the shifting lever which operates the shifting valve; Fig. 5 is a side elevation of the thermostat and its associated parts; Fig. 6 is a front elevation of the same; Fig. 7 is an enlarged detail sectional view, taken on the line :0 no of Fig. 6 and looking in the direction of the arrows; Fig. 8 is a plan section, taken on the line y y of Fig. 7 and looking in the direction of the arrows; Fig. 9 is a detail sectional view, taken on the line 2 2 of Fig. 8 and looking in the direction of the arrows; Fig. 10 is a diagrammatic view illustrating the electric circuits of the apparatus; and Fig. 11 is a detail view of a modification.

In the said drawings, in which I have shown an apparatus embodying my invention in its preferred form, 1 indicates the main gas-supply pipe of a house, the same being provided with a shut-off valve or'stop-cock 2, of any approved form, that shown being a well known form of plug valve comprising a casing 3, and a plug valve 4 rotatable therein to open or close the pipe 1 and thereby control the flow of gas through said pipe. In the present instance, the arrangement is such that the valve is open and the gas can flow through said pipe when the parts are in the position shown in full lines in Figs. 1, 2 and 3, while the valve is closed and the flow is stopped or diminshed when the parts are in one or the other of thetwo positions shown in dotted lines in Fig. 2 of the drawings. To effect the positive movement of this valve, the stem 5 thereof has secured to it by a screw bolt 6 a cross head 7, comprising a body 8, and parallel plates 9 arising above the body and connected by a pivot bolt 10. On this bolt is pivoted the lower end of a lever 11, the upper end of which consists of an enlarged head to give weight to the said upper end, the same consisting preferably of heavy metallic blocks or plates 12 and 13, secured to the upper end of the lever 11 and somewhat offset with respect to said lever and each other. These offsets provide recesses or spaces for springs 14 and 15, which serve not only as detents to holdthe lever 11 normally in upright position, but also as impulse springs to give to said lever a primary impulse or start from its normal upright position either to the right or to the left, according to the requirements of the apparatus The spring 14 is secured on the inner face of the plate 12 by means of a screw bolt 16, which secures the lower end of said springto said plate. The upper end of the spring 14 is bent to form an inclined guard 17, which is adapted to engage the armature hereinafter referred to and permit the spring to pass the armature in one direction without injury of the parts. The spring 1.5 is similarly secured at its lower end to the inner face of the plate 13 by means of a screw bolt 18, and the upper end of said spring 15 is formed into an inclined guard 19 similar to the inclined guard 17 of the spring 14.

Cooperating with thesprings 14 and 15 are two elec tromagnets 20 and 21. These magnets are supported on a shelf 22, which latter may be conveniently held in position by brackets 23, secured to the pipe 1 by clips 24. These electromagnets may be secured to the shelf 22 in any suitable manner, the construction which I have shown for this purpose comprising upwardly extending screw bolts 25, secured at their lower ends to the shelf 22, one pair of screw bolts for each magnet, the base 26 of which has the supporting pair of screw bolts passed upward through its ends, and nuts 27 being provided above and below said base to effect a vertical adjustment of the magnet. Said magnets extend down through the shelf 22 and have their poles projecting downward below the same, the pole 28 of the magnet 20 being immediately above the path of the spring 14, while the pole 29 of the magnet 21 lies above the path of the spring 15.

30 indicates an armature for the magnet 20, consisting preferably of a spring of magnetic material, having one end secured to the under side of the shelf 22 by a screw 31, its other end lying below the pole 28 of the magnet 20 and terminating in a lip or flange 32, which is adapted to the sheli 22 at 34 and having its free end located below the pole 29 of the magnet 21 and provided with a lip or flange 35 to engage the upper end of the spring 15.

From an examination of Fig. 2 of the drawings, it will be seen that when the parts are in the position shown in lull lines, the cross head 7 is horizontal, the shifting lever 11 vertical, and the parts are held in this position by the engagement of the springs 14 and 15 with the armatures 30 and 33, said armatures engaging said springs on opposite sides so as to prevent movement of the upper end of the lever 11 in either direction, the springs being, however, bent and under tension when thus engaged. Assuming that the magnet 20 is energized, the armature 30 will be drawn up into contact with the pole piece thereof, thereby disengaging said armature lrom the spring 17 This leaves the lever 11 free to fall towards the lelt of Fig. 2, it being prevented irom falling toward the right by the engagement of the spring 15 wth the armature 33, which engagement is still maintained. The lever ll being vertical, some active force is required to start its iall, and, in the present instance, where the magnet 20 is assumed to be energized and armature 30 and spring 14 to be disengaged, it is the bent or tensioned spring 15 which-is still in engagement with the armature 33 that gives the initial impulse to the lever 11 by moving its upper end over toward the leftin. Fig. 2 as soon as the spring 14 and armature 30 are disengaged and permit such movement. After the lever 11 has started to all its velocity increases rapidly, of course, and said lever strikes an abutment 36 on the cross head 7 to the lel't of the pivot 37 of the shitting lever, its impact being rendered greater by reason of the weight of its upper end, The cross head 7, thus struck by the weight of the lever, turns with the same and thereby closes the shut-off valve 2. When the magnet 21 is energized and the armature 33 disengaged irom the spring 15, the spring 1.4 gives the initial impulse to displace the lever 11, and said lever falls to the right of Fig. 2, striking against an abutment 38, which, when the parts are in normal position, lies somewhat lower than the abutment 36, thus permitting the lever 11 to move through a larger portion of its arc of movement before it strikes the abutment and begins tomove the cross head along with it. The total movement of the lever 11 being the same, in the construction shown, whether it falls to the right or to the left, the range of movement of the cross head is less when the lever falls to the right, owing to the difference in position ofthe abutments 36 and 38. The construction is such that the tall oi the lever to the right does not entirely close the stop-cock and cut oil the How, but acts to partially close said stop-cock and diminish the flow. The particular construction illustrated by which this result is obtained is designed for use with an ordinary stop-cock, having its ports symmetrically arranged, so that movement to an equal extent in either direction from the normal position will always produce the same result in diminishing or cutting off the flow. Of course, by the use oi a specially designed valve or stop-cock, the particular means just described for varying the amount of movement of the cross head and valve according as the lever falls in one direction or the other may be dispensed with.

The electromagnets 20 and 21 are controlled by a thermostat shown in Fig. l and illustrated in detail in Figs. 5 to 9 ol' the drawings, inclusivev 3!] indi cates a gas stove or other gas heater. having a stove pipe 40 for the escape of the products ol' combustion. a section ol which is shown in Figs. 5, ti and T thc same being employed for the support of the thermostat just relerred to. This thermostat comprises a lever 41, pivoted at 42 to the interior oi the stove pipe section, and extending across said interior and out through vertical slot 43 in the same. The movements of this lever are controlled by an expansion bar 44, pivoted at its upper end to the lever 41. as indicated at 45. The lower end oi said expansion bar is provided'with a nut 45, mounted on a threaded shai't l7 which is swiveled in the pipe 40 and provided with a thumb piece 48 by means of which said screw shalt may be turned. ing oi the bar 44 by reason of changes ol' temperature in the pipe 40 cause an upward and downward movement of the free projecting end ol the lever ll. and the range of this movement is controlled by the screw shaft 47, rotation of which gives to the projecting end of the lever 41 an initial position which is either higher or lower with respect to the contact pieces hereinafter referred to, according to the direction in which the shaft 47 is turned.

Provision is made for indicating visually the position to which the lever 41 is set by the mechanism just described. To protect the mechanism employed ior this purpose and also the contacts which cooperate with the lever 41, there is secured to the pipe it) a box or housing 49, having on its l'ront lace. as shown in Fig. (5, a dial 50, with suitable indicating tigurcs thereon, the box having a hinged top or cover 5]. secured by a catch 52, said hinged cover giving acccss to the interior oi the box. The dial 50 has cooperating with it an index or pointer 53. secured to the iront end of a shaft 54, said end projecting outward beyond the front 01' the box to receive said index or pointer outside of the same. The shalt 5-1 is supported in a bracket 55 within the box, and has mounted on it a pinion 56, with which meshes a gcar segment 57, pivoted at 58 in the bracket To this gear segment there is pivoted at 59 the lower end of a link 60, the upper end of which is pivoted at t3] to the free end of a lever (32, pivoted at its other end, as indicated at 63, to a bracket (54. The lever (52 is engaged by the forward end of the lever ll, the collnection being preferably that shown. in which the lever (52 is provided with a slot (55. through which the lever 41. passes and slides, the lever ()2 having a pin (56 which extends across the slot (55 and passes through a slot (37 formed longitudinally in the lever -11. by reason oi the connection just described, turning the thumb piece 48 to shift the position of the lever it The lengthening and shortcu- 'will correspondingly turn the index or pointer 53 and thereby move said pointer to conform to the initial position of the lever 4i. The contacts hereinbct'ore rel'erred to, indicated respectively by the relcrcncc numerals (1'8 and G9, are arranged respectively above and below the lever 4-1. in the path thereof, and it will be seen that it the lever be set to any given position, the precise increment of heat which will cause it to rise sufliciently to touch the upper contact l8 may be readily determined. and the scale ol tigurcs on the dial may be so arranged that for any given I position oi the index 53, the figure to which said index points will indicate the temperature at which the lever 41 will be raised to a position such as to strike the contact 68. l t will be understood that. when the device is in actual operation, the lever 41 will always be so adjusted that upon a decrease in temperature in the pipe 40 such as follows the extinction of the flame of burning gas in the stove or heater, the contraction of the bar 44 will draw the lever 41 down so as to cause it to bear upon the contact 69. When the device is not in use the lever may be readily adjusted by means of the screw shaft 47 so as to remain fixed'in a position between the two contacts and out of contact with both of them.

In Fig. 11 I have shown a modification of the connection between the expansion bar and contact lever, the former being indicated in this instance by the reference numeral 70, and the latter by the reference numeral 71. In this construction, an intermediate lever 72 is employed, pivoted at 73 to the pipe 40 and having the upper end of the expansion bar 70 pivoted to it at a point 74 near its own pivotal point 73. The lever 72 is pivotally and slidingly connected tothe contact lever 71 at its free end, as indicated at 75, and the distance between the pivots 74 and 75 is greater than the distance between the pivots 73 and 74, so that the expansion of the bar 70 results in a correspondingly increased range of movement of the contact lever 71, thereby rendering the latter more sensitive to the variations of the length of the expansion bar than in the case of the direct connection such as is illustrated in Fig. 7.

The contacts 68 and G9 are mounted on an insulating block 76, each contact having a base portion 77 at right angles to its body portion, through which base portion passes an adjusting and clamping screw 78 and out through the wall of the box 49, its outer end receiving a thumb nut 79, which bears against the outer wall of the box. Each contact has an angularly arranged extension 80 of its base, which forms a convenient means for swinging the contact around the screw 78 as a pivot when the nut 79 is loosened. By this means the contacts 68 and 69 may be independently adjusted up and down relatively to the contact lever 41, thus forming an alternative means of adjustment of the contacts to the desired temperature, and one which may be employed to bring the actual contact into conformity with the indications of the pointer and dial in case of disarrangement of the device.

The lever 41 is connected to one terminal of a battery or other suitable source of electrical energy 81, the connection being shown as effected by means of a Wire 82. .The contact 68 is connected with the coil of the electromagnet by a wire 83, while the contact 69 is connected with the coil of the electromagnet 21 by a wire 84. The other ends of the magnet coils are connected by branch wires 85 to a wire 86 which leads to the other terminal of the battery 8]., and a switch 87 is located in this portion of the circuit, so as to make or break the same by hand. These circuits are shown diagrammatically in Fig. 10 of the drawings. It will be seen that when the temperature within the heater 39 and pipe falls a suflicient extent by reason of the extinguishing of the fire through the cessation in the flow of gas, the arm 44 will cool and contract, moving the lever 41 downward into contact with the contact 69. This closes the circuit which, starting from the battery, proceeds through the wire 82, lever 41, contact 69, wire 84, magnet 21, branch wire 85 and return wire 86 to the battery. The magnet 21 thereby becomes energized, the armature 33 is attracted and releases the lever 11, and the latter, being given its initial impulse by the spring 14, falls to the left in Fig. 2 of the drawings, and closes the stop-cock 2, thereby cutting off the flow of gas. On the other hand, if by reason of an excessive flow of gas or some other cause the temperature rises too high in the heater 39 and its pipe 40, the bar 44 will expand and move the lever 41 upward until it strikes the contact 68, whereupon the circuit will be closed from battery 81 through wire 82, lever 41, contact 68, wire 83, magnet 20, branch wire 85 and return wire 86 to the battery. This closed circuit energizes the magnet 20, attracts the armature 30, releases the lever 11 on the opposite side, and permits the spring 15 to give it an initial impulse which causes it to fall to the right in Fig. 2 of the drawings, partly closing the stop-cock 2 and diminishing the flow of gas. The position of the fallen lever will indicate whether the gas supply was affected because of failure of the gas supply or because of an excessive temperature, so that steps may be taken to remedy the matter. Of course, by bringing the lever 11 upright and again engaging it with the armatures 30 and 33, the stopcock 2 may be again opened to permitthe flow of gas to the heater.

It is-deemed advisable to provide a signal or alarm which will be operated whenever the temperature passes the limits prescribed for it, and for this purpose I prefer to employ a bell 88, connected with the bat tery 81 through the medium of a wire 89, joined to the wire 82. The lever 11 is in electrical connection with the other terminal of the battery through a wire 90, joined to the wire 86. Wires 91 and 92 lead from the bell to contacts 93 and 94 respectively, said contacts being arranged on opposite sides of the pivotal axis of the lever, in a position such that when the lever falls to the right of Fig. 2 it will come into contact with the contact piece 93, and when the lever falls to the left in said figure it will come into contact with the contact piece 94. In the former case a circuit is established from battery 81, through wire 82, wire 89, bell 88, wire 91, contact 93, lever 11 and wires 90 and 86 back to the other terminal of the battery, the circuit thus closed operating the hell or alarm 88. In the latter case, when the lever falls to the left, the circuit is established from the battery through Wire 82, wire 89, bell 88, wire 92, contact 94, lever 11, and wires 90 and 86 back to the other terminal of the battery, in which case the bell or signal 88 is also actuated. The switch 87 may be used to stop the sounding of the signal b'ell after it has attracted attention, and for this purpose the bell and switch may be conveniently arranged in one part of the house, say, for instance, a bedroom in an upper story, while the heater may be located in the same room or another room, or in the basement, and the balanced lever 11 and its controlling magnets may be located in still anotherportion of the structure, these latter being usually located in the basement or cellar, so that the stop-cock 2 may be placed in the supply pipe at a point between the source oi supply-g gas and the. fi s imnch pipes within the house. Thalia, the i0- nntiun of the switch 87 in a convenient portion oi-thc house avoidu the neceoeity oi descending to the cellar to lift the lever ii for the purpose oi breaking the circuit: at the contacts 93 and N. that some of the icnturcx'oi the construction just described are available in a structure where the iever 11 is not employed for the purpose of automatically closing the atop-cock, since it may be eecnthut the cloning of the signal circuits on an undue ri o or fall in temperaturewill notiiy'the occupants of the house and enable them to shut-off and regulate. the gas hyhand, if necessary.

i l have described an appnnitus embodying my invention in its most, highly developed form, comprising limth an automatic shut-oil and alarm uignnl. operative. upon either an excessive rise or full in tcmpeniture, and no constructed as to indicate alter its operation whether the sumo was due to a rice or in ii. full in tunipcmture. lint the invention, in its simpler ionnn, does not; require the embodiment oi all of these features, some of which may be omitted. For inntztnce nne oi the'two contacts GS, (59, may be omitted, and the mechanism so organized as to respond only to an excessive rise or to an excessive full in temperature. It is also nppnrent that while it is desirable that the lever, l'iy milling in different directions when actunted by differcnt condition s, hould indicnte the cnune oi the i-rou hie, neverthclca, the uppumtus may be simplified by causing the lever to {all ulways in the same direction,

whei-hernctunted by a rise or full in temperature, since the gun vvill lie shut. off and the signal nctuutcd in this case stir-.0. althoughlhe lever would not, indicate the slctuatiug conditions.

.l wish it. to be understood thnt I do not desireto be limited to the exact details of construction nhown and described, for obvious modificatione will occur to a person skill: d inthc art.

Having thus fully described my invention, what, 1 claim on new and de$irc to secure by Letters Patent,

1. A safety dcvicc for iicuters,-centprining n gnu nuppiy pipe, n atop-cock ruutroillnr; snid pipe and having n laterallycnxicmhfl mm. it \vehzhled lever pivoted nenr said liiflll'cultk und'nl'r'mi'cml 'Io strike buit'l urm when releused to operate nnld utup-cuclt, nu electro-nmcnct having an nrmnturc which nctn when free to prevent the full at unid lever. on elect ic i'lrctilt including suiti elerlronuignct and u neuron of electricity, mid n circuit-cloning device cuntrotllm; tho circuit and nctuntcd ivy the tempernture 0! th ln-nler, nuimtnntinllg; us Ill crlhcd.

L. A Mir-u tltu'icc t'or hen'r l4, comprlsim, n cus supply pipc. n atop-cock nonuolllm: the sump, n normally upright lcvi-r il 'ililL to npcrutn Milli Mop-cock by its [nil in elther.

direction when rnlchneil, two elcctroninzncts. the' rumiul'cn whcrcol' support liilltl lever on opposite nldcn, nn ilit'llit' circuit including .illlil elcctroningnctn, and n clrcull-cloning nrrn. (.unrnrts locntcii on npptmitc sides of mild urm null clocrrlculh' connected with the respective nun,- nclx, and n theriumint controlled ll the roniperuturc oi the hunter and netting to more mild circuit-closing urn:

' ngnlnst. one or the other of'nnid cnntuctu ni the temperature either rlsca or bills. exccruhL-ly, uulmtnntlaiiy on dertt'llictl.

.i. in n safety device for llutlitlii, n rtup eoclr controlling the gas supply,, uml it normally Ulil'lLlllLltlVGi' acting to opcrnte unit? atop-cock by its fall in either direction when rlieiucd, in combination 4 with. two elccironmuuetn, the nrmutureu whereof engage nod support Rilltl lever on oppo- It will be understood File silica, means for energizing said eicctromagzncts upon an undue rise or all of temperature, rcspcctlvely, and springs interposed between Hillll magnets and armature-s,

'whcreby when one nrnlature releases the lever the spring which engages the other armature gives the lever an lnitlnl impulse, xuliutnntiully as described. i

4. in a safety device for beaten, n gnu supp]; pipe, :1 stopcock controlling the same and provided with n Cl'O ir head, I. weighted 'lever plvotally mounted on the crow head and ldapted to strike the name when it mm in eithedlrection, means for holding mid lever normally in uprlchi punli'lnn, and means for rclcuulm: fllllfl lever to cnune it to (all in one direction or the other upon on undue increase or decrease in the temperature, nul-mnntlnlly as described.

fn'ln a mint device for hcutcnl. a Mop-cock, a non mnliy upright lever controlling the. some and acting to opcrnie uuid slop-cock by its full in either direc ion. two clectromnuuets, the :irmatures whereof support fluid lever on opposite sides, an electric circuit including it source of electricity, 1! CliCUlbClO-Qlllt: arm, and branch circuits including said clecrromnunets: nml coutncls on opposite aide!- of Rflld arm.- and u shunt circuit lnciudlm: the. lever. on rlinrm. and cuntncts urrungcd on opposite sides 0t said lever and electrically connected with said nlnrrn, substnir tinlly us (h-scrllicd.

G. in it surely dc'rlce tor heaters, the combina ion, with the outlet pipe or the heater, of 11 contact lever lmving one end extending into said pipe. 21 contact in the path 0! the outer end thereof. nud an expansion 1m located in said pipe nnd connected with the inner end of will contact lever. substantially as described.

- in, a safety device for heaters, the combination, with the outlet pipe of the heater, 0! a contact lever having one end extended into snid pipe, contacts located on opposite sides of Snlil contnct lever, and an expansion our located in unld pipe and connected with the inner end of said contact lever, suhstnntlnlly as described. 1

8. in a safety device for imaierm the combination, with the outlet pipe of tile hunter, of a. contnct lever,.n coninct locntcd in the (anti) thereof, an expansion hur locri' ad in the pipe nnd cenuected at one end with the contact "cc-r, and means for shifting the other end oi snld expnnslon our to vary the distance between the contact lever and no! inch-substantially as described.

9. In a safety device {or heaters, the combinntion. with the outlet pipe of the heater, of a contact ercr. n contact Jocnted in the path thereof, an expansion lmr located in the pipe illlil connected at one end with the ('untnct lever. means for shifting the other end of said expansion imr to vury the distance between the contact lever and centnct,

and nu llilllct ting mechanism opcrntint; in unluou wizh said lever, suhatnntinlly ns described.

10. In n nnietydevlce {or hentcrs, the cnmnlnuriun. with the outlet pipe of the beater, oi u cuntucl lever, contacts located on oppouilc sides thereof, no expansion lmr located within the line and connected ni. our: end with the contact lcver nnd menus (or uhllllm; the otLrr end or mild expansion bar to vnry the position of snld lever relatively to the cuntncts, substantially nn described. I

11. in 1). safety device for hcutcrs, the comblnntlon, with the millet pipe of the heater. of u cnntnct lever plvolnily mounted nn snld pipe and extending ncrusu tin: sumo. at contact in the pntli or said lever, u awroiv'silutft mounted to rotate in suit] pipe. and on cx-pnnsion lllll hurln r n tin-ended engutzunmnt with the screw admit. at one end, its

other end bclnc' connected with the c'ontuct lever, SillJSllllltlally us dcucrlired.

' 12. A nn'ieii' device tor heaters, comprising n gun Supply th-zrrnoutnr'controlled in the temrwrutuic or the heater and acting to rnove mild circuit cloulognrm against one-or the other of puldcontnctn as the tcmpcrziture either rlups i itails exceualvely, iuimtantlnlly rm described.

lilo

In Safety devifie heaters, 61 g pp y P p 8 one direction or the other upon an undue increase or de- [0 SKOMOCK controlling the some and provided with a cross crease in the temperature, substantially as described. head, a weighted lever pivotzilly mounted on the cross y 1, tcstimgny h f, I afiix my signature in presence of head, ahntments differentially located on opposite sides of t it 5 said cross head, whereby the cross head is moved to different extents according as the lever falls in one direction or IRA FILSON' the other and strikes one or the other of said abutments, Witnesses: means for holding said lever normally in upright position, H. L. HAMMAKER, and means for releasing said lever to cause it to fall in IRVINE MILLER.

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