US1820842A - Electrical heating device - Google Patents

Description

R. M. SPARKS ELECTRICAL HEATING DEVICE Aug. 25, 1931.

Filed May 21. 1950 paid-Jimm- J-illllllll ATTORNY Patented Aug. 25, 1931 IROBEJEML M. SPARKS, OF DAYTONA BEACH, FLORIDA ELECTRICAL HEATING DEVICE Application filed May 21,

My present invention has reference to an electrical heating device primarily designed for use in connection with boilers, water heaters, radiators and like plants or devices, but, of course, susceptible for use in various other connections.

The primary object of the invention is the provision of an electrical heater which shall be of a comparatively simple construction, cheaply manufactured, easily assembled and which shall be safe in use as the same is protected from any liability of short circuit.

A still further object is the provision of a heating device that includes an outer metallic cylinder designed to contain therein an oil or other insulating material, the said cylinder having tightly fixed to the open mouth thereof an insulator top provided with a vent opening for the expansion of the oil, a spirally grooved'core of porcelain or the like in whose groove there is arranged the coil heating element, insulator spacer members for holding the core,v and'the element from contact with the casing, a conductor rod which passes through the insulator top and the upper spacer element and to which one of the end wires of the coil is connected, the said conductor being surrounded by a porcelain tube to protect the same, a second and longerconductor which passes centrally through the top, the core and both of the spacer elements and to which the second end of the coil is connected, the portion of the last mentioned conductor above the upper spacer element being surrounded and protected by a porcelain tube and both of the conductors affording terminals for the circuit wires.

A further object is the provision of a heater element which may be arranged either vertically, horizontally or angularly in a boiler, water heater or the like.

The invention will'be fully and comprehensively understood from a consideration of the following detailed description when read in connection with the accompanying drawings which form part of the application, with the understanding, however, that the improvement is capable of extended application andis not confined to the exact 1930. Serial No. 454,402.

showing of the drawings nor to the precise construction described and, therefore, such changes and modifications may be made therefrom as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

In the drawings:

Figure l is an approximately central verlongitudinal sectional View through the device.

Figure 2 is a top plan view thereof.

Figure 3 is, a sectional View on the line 33 of Figure l. In. the drawings the numeral 1 designates the metallic cylindrical casing of the improvement. The casing has a closed bottom and an open top. In the showing of the drawings I have screwed around the open top of the casing l a ring flange 2 which may be either of metal or of insulating material and secured to the flange 2, by set screws 3, there is the insulator top 4 of the device.

In the showing of the drawings the easing 1 is partly filled with an oil 5. The oil, of course, is in the nature of an insulator and in lieu of the oil any other desirable insulating material may be employed. The top 4 has a vent opening 6 to permit of the expansion of the oil 5 when the same becomes heated in a manner which will presently be described.

in the casing 1, below the level of the oil 5, and also at a suitable distance above the closed bottom of the said casing there are arranged combined insulator and spreader members 7 and 8, respectively. Preferably and as disclosed by the drawings these members are substantially cross-shaped in plan, that is, each of the members has its body formed with extensions 9 whose edges are rounded and each of the extensions 9 is provided with an opening 10. Also the center of each of the members 7 and 8 is provided. with a round opening.

Between the insulator members 7 and 8 there is arranged a spirally grooved core 11 of porcelain or the like, and in the groove of the core there is arranged the spirally wound heater element 12. The lower and straight end of the heater element 12 passes diffuse the same into the surrounding air. through one of the openings 10 in the lower The oil, mica or other non-electric conductor member 8. There is arranged on the lower in the casing provides an additional heat terminal a brass or like rod 18 that passes retaining and heat diffusing means so that 5 through the central openings in the memwater or other substance can be quickly here 7 and 8, through a central opening in heated by the device when the casing therethe core and through a central opening in; of is::immersed;,1 therein, ivThe; spirally the insulator top 4. This end ot-the-heater grooved-porcelain. or glass-core 11 prevents element is clamped between lock nuts. l4, thesagging or bending of any part of the 19 respectively, which are screwed on the lower heating element 12 and it will be noted that end of the rod 18. there are only two connections for the heat It is to be noted that the members? and ing .element 12, the same being the rods 20 8 have their outer edges disposed slightly and 13, and as these rods are connected by away from the inner wall of the casing 1 glOCk nutsthepossibility of the same becom- 15 and that the spaces between the right anguing loosened and the short circuiting ot' the lar extensions-t) and the said membersfi and. device. isireducedato La minimumnand also 8 and likewisethe openings permit of the thatwitlr'my.construction-a number of-parts passage of the oil or-like insulator 4 thcre-- ordinarilyi'employedrarczeliminated; ItLWlll through. be-ifurther. noted? thatishould: the-heating, Surrounding'theportion of the -r0d-13- elementburn-outior becomewbrokenit cannot that is arranged be'tweerrtheupper member contact with the brass conductonrodolii: so

7 and the top or closure 5 there-is'a porcethat anyliability: of shortqcircuitinghin; this lain tube and this tube'is held in tight particulariinstance. is; also-effectively overcontact with the said member- 5 and-witlr come.- ItiWItll beiunthennoted thatrby plac-v the top 4 through the medium of a binding ing-theretumelectricgcurrentathroughthe.

nut 16 which is screwedon the upperor metals-conductor rod 13,:wvhich: isarranged outer end of the rod. 1 Another-binding nut inthe.centeriottheinsulatorcore,11, a sav- 17 is also screwed on the rodandthesenuts inga ofspaceis reflected-j I 'Will be further grip therebetween thereturn wire '18 for 'apparentst attthe.c sing 1 i r gh n the source of electricity; that thelubricantfi, in additiontorthe tune:

The upper straight end of the wire provid tion. thereforabovesetforth :aotsi as ;a pro,-

ing the heatingcoil 12,56 d m d b t SGIXVBIJfOI -,hlleilfeslsfianfle coil to prevent the,

binding nuts 19 that are screwedon the- Same/readily!bumllingvoutfinal-consequently lower end ofa copper or like rod-20 which PIBSBIVEJthQ f t filwini.

passesthrough one of the openings 10 in-the' When thedevice is arranged-horizontallyupper insulator spacer member 17 and gu ly the? Vent 6 is Phwfid atflnycm through 'an opening-in the-insulator top -4 venientwlocationrithon ontthetop or in the, of the improvement. The rod 17 issur-' bodyiofi'thlcafiingflrounded-bya porcelain tube 21 ar-rangedbe- Hal-ling*desclibedmeinyentlfimnl Claim? "tween the member 7 and the innepface f 1. Ali. electrical heater'inoludinga metal,- the insulator top 4 and the tube is held" in licncasing rhavinguan; insulating S bstance tight-gripping engagement ith th aid therein an-dilnavingiani insulator top,,a spir-- members 4 and? through the medium of a ally groovedvporcelaimzcorevin. the ,casing,, binding nut 21 which is screwed on the outer insulator ,spacer-.-;elementsz contacting; with end of the c nductor 0d A secondi and. thehendsiofnthe' heater, 5L :hGEtEI'uCOllnillL the outer: binding nut 22 is screwed on the-said groove, a metalnrodtcxtendingi throughwthe outer end 23 of conductor rod- 20 and be spacer elements thevcoreandttheltopptthe; tween the nuts 21 and 22 there is clamped casing, binding nutsionitheends-of theu'od, the end 24 of a conductor that is connected thez'low-en bindingwnutsisecuringAthmebe-v with a source of power 'for directing electween one iendtoi the heater. coilsandathei tricity through the conductor 20;. and upper-bindingnutsubeingiconnectedwith: an; through the coil 12, therod 13 being in the electriciconduotona porcclaintubc surroundnature of a return conduct0r.- ing the portion of the rod above the. upper 7 With my improvement it will be seen that spacer-member, a conductor. rodibetween the the conductor rods 20 and-18 are-held spaced uppervspacerr memben and-the top,.;binding tromthe'insulator tubes 20 and 15 and from nuts :on the .ends thereof, the inner binding the insulating material 5 in the'casing 1. nuts being connected to thewsecondnend of It will be further noted that there is no dan-' thetcoil. and; the .outer binding-nuts being I gerof short circuiting the device regardless connected-to. the secondaviraof the' conduc-i of the position in which it is-arranged as tor.

the insulator members 7 and 8 holdthe core 2'. fAmelBc vic llcfliteri-llcludinga metal case 11 and the coil 12 from any liability of com ing..l1avingi.a substances-of insulating-- 1113+. tact with the metal casing 1. It will be ap teri-alitherein, an; insulator. C0Vl-I'8lI10'Vlbly parent that the electric current --passingsecured torthepopenvend 10f the casingnandthrough the coil 12- will generate heat and havinga vent ,porttherethirough,upperxand lower insulator substantially cross-shaped spacer members in the casing having openings in the branches thereof, a spirally grooved porcelain core between the spacer members, a spirally wound heating wire in the groove, a conductor rod between the upper spacer member and the top, binding nuts on the ends of the said rod, the lower binding nuts being connected to one end of a heater coil and the upper nuts being connected to a source of electricity, a porcelain sleeve surrounding the rod, a second and longer rod extending centrally through the core, the spacer members and the top, binding nuts on the ends thereof, the lower binding nuts clamping the second end of the heater coil therebetween and the outer binding nuts clamping the return wire for the source of electricity therebetween.

3. An electric heater including a metallic casing having an insulator substance therein partly filling the same, a flanged ring screwed on the mouth of the casing, a top of? insulating material arranged over the ring, set screws securing the top to the ring, upper and lower substantially cross-shaped spacer members of insulating material, having openings adjacent to the ends thereof, a spirally grooved porcelain core between the spacer members, a metal rod between the upper spacer member and the top having binding nuts screwed on the ends thereof, the inner binding nuts clamping therebetween one end of the heater coil and the outer binding nuts clamping therebetween a conductor from a source of electricity, a porcelain tube surrounding the rod and ar ranged between the top and the upper spacer member, a metal conductor rod passing centrally through the core, the spacer members and the top, binding nuts screwed on the ends of said rod, the lower binding nuts clamping therebetween the lower or second end of the heater coil and the upper binding nuts clamping therebetween a return wire for the source of electricity and a porcelain sleeve arranged between the upper spacer member and the top and surrounding the portion of the last mentioned rod eX- tending beyond the upper spacer member and said heater having a vent opening.

In testimony whereof I aflix my signature.

ROBERT M. SPARKS.

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