US1531518A - Electrical heating appliance - Google Patents

Description

1 slMMoNs Marchal. 192s;

ELECTRICAL 1-EATING 'ABLIANGE 2 Sheets-Sheet 2 Fund Nov. 1v, i923 invention those skilled in the art in the' light of the h `following explanations .of

appliances v'among other forms,

rangements within the spirit and scope Patented Mar. 31, 1925.

UNITEDSTATES PATENT OFFICE.

LEO SIMMONS, OF WASHINGTON, DISTRICT OF COLUMBIA.

ELEcTarcAr. HEATING arrmancn.

Application mea November 17, 192s. semi No. 675,265.

To all whom t may concern.:

Be it known that I, LEO SIMMONS, a citizen of the United States of America, and a resident of Washington, District of Columbia, have invented certain new and useful Improvements-mand Relating to Electrical d Heating Appliances, of which the following is a specification.

Thls invention relates to electric heating appliances, and the objects and nature of the will be readily understood by drawings that illustrate what I now believe the preferred embodiment or mechanical expression of my invention from constructions and arthereof.

An Object of the invention is to .provide certain improvements in electrical heating' whereby an air heating throat, for the passa e of air or an air blast, is prosurfaces of extensive areas.

With this and other Objects in view, my

invention consists in certain novel features in construction, and in combinations and arrangements as more fully and particularly set'forth and specified hereinafter.

Referring to the accompanying drawings thatform .a part hereof:

Fig. 1 is a longitudinal vertical section showing an electrical heating appliance em-V said section and o ying my'invention.

Fig. 2 is a front end elevation thereof. Fig. 3 is a rear end elevation thereof. F'g. 4 is a detail elevationof the open or front side of the rear section of the throat ring, showing the porcelain or -other vitrified ceramic material ring secured in the ring-like heating coil therein, the mica covering for said coil being removed.

Fig. 5 is a detail elevation of the open or side of the front section ofthe throat n the particular example'illustrated for purposes of explanation, I provide a tubular or open-end hollow housing to form an air tunnel provided with the heat radiating and air heating throat of m invention and an electric motor driven b ower, whereby thel air from living quarters closure in which the is .circulated through or any other enappliance is located, the tunnel and its .heating throat. The air the accompanying `the hollow ceramic 'and rear feet 1b, adapted to rest is thereby kept in circulation through the tunnel and throng out the enclosure to raise the temperature within the enclosure and approximately malntail such temperature at the desired egree.

In' this example, the open-end tubular housing that forms the air blast tunnel, is composed of a longitudinally elongated hollow' onefpiece body 1, of vitriiie is example, I show a rotary blower 2,- carried and driven by electric motor 3, both being arranged withinthe rear open end of earthen-- t ware or other ceramic material preferablly composed of ceramic marolling*l and spaced upwardly from the floor.

In t

2.5 vided with air heating and heat radiating easV the tunnel with the axes of the motor shaft and blower approximately alined with the longitudinal axis of the air tunnel, and lwith the blower fan in diameter, usually, butv slightly less than. the internal diameter of the rear end of the tunnel. This blower is intended to circulate the air through the tunnel from front to rear.

The electric motor and the blowerv carried 'and driven thereby are preferably removably mounted and supported in the rear end of the tunnel', by

means 4,; gripping and holding. the motor any suitable clamping and carrled by any suitable supporting Ymeans 5, held within the tunnel and fitting v the inner surface thereof.

Within the front end of the tunnel I lit and secure an annular casing or ring enclosing the electric heating coil or other resisto f the enclosure ance, designed to become incandescent or glow at anapproximately red heat when the electric power current is. passed therethrough. This annulus or annular casing 1s concentrically arranlged within the tunnel with its longitudina axis or central opening or bore approximately alined with the longitudinal axis of the tunnel, to form a throat within the tunnel through which the air blast or air circulation'must pass on its way through the tunnel.

section.

In the example shown, this heating coilenclosing ring that forms the throat, is composed of two vertical annular metal sections arranged side by side and suitably clamped or otherwise secured together. The rear section of this ring is in the form of an annular trough, approximately U-shape in radial p section, with'a flat bottom vertical wall 6, that forms the rear end wall of the ring, an vouter cylindrical circumferential wall 6", and with an inner cylindrical wall 6", around the central air passage through the section. The annular trough formed by this section of the ring is open at the front while the'oor or rear thereof is closed by wall 6.

In the example shown, the heating element is arranged within the open front trough. formed by this rear section of the throat forming and heat radiating ring. In this instance, the electric resistance is in the form of a coil 7, annular or circular in form,and confined within agroove or annular channel` 8, in the front side of a vertical porcelain or other insulating materia annulus 8", arranged within said trough and secured against the rear wall 6 of the ring The otherwise open frontof the channel 8, is preferably covered by mica'.v 9 or other approximately transparent material to protect the. heating coil from the air blast and from injury.. The terminal posts 10 of the coil 7 are here shown extending rearwardly through the porcelain annulus 8a, and through holes in the rear wall 6 of the throat ring for the attachment of the electric power leading in wires here shown as extending outwardly through a radial hole in thebottom ofthe tunnel housing 1, and extending rearwardly below said housing-to a suitable switch 12, carried by a bracket 13 depending from the rear ends of said housing and from which electric power'wircs 14 extend to thev motor 3.

The front annular section ofthe throat Vring is of annular trough like formation with'open side of the trough at the rear :face of the section 'and registering with the open frontof the rear section to form the annular chamber or enclosed annular space within the throat ring. is formed with cylindrical circumferential.

wall 1 5 of the same diameter as and alined with rear ysection wall 6", and with Vertical.

annular front side wall 1:5", and with rearwardly contracting central longitudinal conical wall 15", extending rearwardly from the inner edge of front wall 15, to and at its small rear end edge fitting the front end of the inner wall 6" of'rear section.

'lhese front and rear sections of the throat ring are usually composed of castings, each section formed by one casting, although I do "not wishv to so limit allV features ofA myA invention.

this 11 which are This front section v located la substantial These two sections can be secured together by any suitable means, yalthough I prefer securing means Athat will permitvseparation of the sections to render the heating element accessible for inspection or replacement. In the particular example illustrated for thisurpose, I show fore and aft clamping bolts 16 extending transversely through the sections." These'bolts are `shown arranged in a circular series just within the rims 6",

15, and extending through the rear vertical wall 6 and the front vertical wall 15 and ring nuts on their rear ends. In instance, these clamping bolts are formed by hollow metal tubes open at their front ends through wall 15 and at their rear ends through walll 6, 'to form a multiplicity of air heating passages through the throat rim and cut off from the interior of. said ring The conical bore orinner longitudinal wall 15", of the front throat ring section, is preferably slightly elongated rearwardly so having 1 that when its rear edge is tightly drawn by bolts 16, aga-inst the front edge of inner wall 6", the two throat ring sections vwill be held with their rims 6a, 15, spaced apart, leaving an intervening annular space, allowing for expansion and contraction.

-The external diameter of the rims 6", 15 is preferably a fraction of an in ch less than the internalvv diameter of the portion of the tunnel housing within which the throat ring is located to permlt easy fitting and removable securing of vthe ring in said tunnel housing, and particularly to allow for ex-,

pansion of the ring without exerting such bursting pressure on the tunnel housing as might tend to split or damage the same. I preferably arrange a layer or sleeve 18 of more or less compressible insulating material, such as asbestos, externally around the rim o f he'throat ring, bridging the gap betweenlthe section rims 6, 15. This packing 18 is intended to more or less insulate the throat ring from the Surrounding tunnelwall as well as to form an approximately lair tight and cushioning packing between said tunnel wall and the rim of the throat ring.

The `throat ring when `located in the cylindrical front end portionv of the tunnel -housing forms an annular contraction or battle (rear-face wall 6) distance in advance of the blower 2. lThe annular series of longitudinal air tubes 16, open at their rear ends within the tunnel bore4 through this annular baic and. discharge at their front ends into the tunnel housing bell outlet in front of the throat ring.

The abutting inner longitudinal annular walls 6", 15", of the ring sections form a central longitudinal contracted throat extending forwardly from thefcen-terfvof this balile and discharging forwardly into the the throat into that advantages are tunnel housing bell outlet. This throat flares or enlarges forwardly and the exposed surface of the conical or fiared wall 15b, of this throat is formed with an extensive heat radiating and air contacting surface by an annular series of longitudinal spaced ribs or corrugations 15, and by an annular series of spaced transverse ornamental openings or perrorations 15d, openin from the bore of the high ber within the throat ring.

When the proper ower current is passed to the heating coil g, said coil glows, and although the coil is protected from injury by mica 9, the red g ow is visible from in front of the tunnel housing through openings 151, The approximately incandescent coil highly heats the air within the throat ring and the walls ofthe throat ring and the metal tubes 16, become highly heated and radiate heat within the tunnel 'bore and the air throat through the ring. I find gained by forming the ring sections of aluminum or aluminum alloy because of the high conductivity thereof, although I do not wish to 4so limit my invention. The blower motor is remote from the throat ring and is thereby protected against injury by the-heat generated within the throat ring, particularly as the casin 1, is preferably vitrified ceramic material-apoor conductor of heat and as the throat ring is insulated therefrom by packing 18.

The constantly-acting relatively-largediameter blower tends to build up an air pressure in the chamber of the tunnel betweenthe blower and the baiiie or contraction in the tunnel formed by the throat 15". The heated air from the heat that,v would otherwise be ring slipped into the cylindrical portion-of thp tunnel behind the tunnel flare. Under this pressure, the air finds relief by forward fiowthrough the multiplicity of hot heatradiating airtubes 16 and the central throat of the ring. The air expands as it flows through the throat and is subjected .to con` tact with and heat radiation from the flaring and ribbed surfaces of the conical wall tubes and the throat is discharged into .the flared front end of the tunnel and is driven therefrom.

into the room or other enclosure to be warmed'. The room orother enclosure can thus be rapidly and economically warmed;

The multiplicity of heat radiating air discharge tubes 16, opening through the throat ring from rear to front and forming an annular series just within the. rim of said ringand surroundin the annular .heating coil 7 and its porce ain ring, important function. These -tu absorb partially wasted or' partially conducted to the e'xteriorly exposed or unguarded outer sur-` face of the casing 1, and the heat of sa1d y heated air cham-V forming .wardly f larlng air heating t rform an -rmg having a central longitu tubes is largely absorbed or carried oi by the air rushing forwardly therethrough.

A Advantages are also gained bythe annular coil and its porcelain ring holder surrounding the throat and in contact with the walls 6 and 6*. By this arrangement, the Aairheating capacity of the throat ring is increased, a strong durable easily assembled structure is produced, and the porcelain ring and its contained heating coil can be handled and a plied and removed as a unit. The porcelain ring is strong and comparatively heavy and thoroughly protects the coil. The coil is in the form of' an approximate ring moreor less loosely confined in the groove 8, in a vertical position and free to expand and contract without injury. The groove 8, is crossedy at intervals by bridges or cross pieces 8b, porcelain ring, which loosely confine the coil from sliding forwardly from the groove. It is evident that various changes, modifications, and variations, might be resorted to without departing from the spirit and scope of my invention, and hence I do not wish to limit myself'to the exact disclosures hereof.

What I vclaim is:

l. An air heating throat rin 'for the tunnel of an electric heating app iance, embodying front and rear annular sections a hollow ring with a central longitudinal air heating throat, Vand an annular insulating heating element carrier secured within said ring nular electric resistance heating element, said ring through said throat. v

2. An air heating throat ring, for the forced air tunnel of an electricv heatin apliance, said ring formin a central air eating throat extending t rough the ring from rear to front and an annular interior chamber surrounding said throat, an annular electric resistance heating element Vin said chamber and around said throat, and an annular series of air heating tubes exring and separated from said `tending from rear to front through said ring and chamber.

3. An air heating' and heat radiating throat ring, for the forced air circulatin tunnel of an electric heating appliance, sai ring having a central loniltudinalA for" oat opening therethrough from rear to front, and an an nular enclosedchamber surrounding said throat, saidthroat having transverse openings through its flaring wall into said chamr, and annular electrieresistance 'heating means in said chamber and surrounding said throat.

4. A11 air heating and heatlradiating for the forced air cireulat' throat ring, tunnel of an electric heating appliance, vaai al air heat-- integral with the I and provided with an anproviding air heating passages ing throat opening therethrough and an annular enclosed chamber surrounding said throat and electric resista-nceheating means 1n said chamber', sald ring embodying annu.-

` lar sections and tubular clamping bolts Aseance chamber surrounding said throat, said ring providing air heating passages open -ing therethrough from rear to front and traversing said chamber.' v

An air heating and heat radiating throat ring for electric heaters, comprising annular trough like sections securedy t0- gether with their annular troughs facing each other to form an annular enclosed chamber surrounding an air heating throat opening through said ring from ont to rear, and electric resistance heating means enclosed within said chamber and surroundinc said throat,

- An air heating and heat radiating lthroatring for electric heaters, comprising walls forming a front, a back, a rim, and a central longitudinal air heating throat open' ing through the ring from front' to rear and flaring forwardly, said throat formed with a surrounding series of exposed radiating longitudinal ribs or corrugations, said ring walls forming an enclosed annular chamber around said throat, and electric resistance heating means in said chamber and arfy ranged around said throat.

8. A n air heating and heat radiating throat ring for electric heaters, comprising Walls forming a front, a back, a'rim, and a central longitudinal air heating throat opening through the ring from front to rear, said ring walls forming an enclosed chamber surrounding said throat, electric resistance heating means in .said chamber, and cushioning and insulating packing exteriorly surrounding said rim.

9. An air heating throat ring for an elechcat radiating tric heating appliance, embodying walls' forming an air heating throat opening centrally and longitudinally through said ring from rear to front and a rim having an opening extending annularly around the rim intermediate the ends thereof, cushioning packing enteriorly surrounding said rim and bridging said opening, said walls providing an enclosed chamber surrounding said throat, and electric resistance heating means in said chamber. Y

' 10. A throat ring for an electric heating appliance, having walls forming an annular enclosed chamber and an air heating throat surrounded by said chamber and opening through the ring from rear to front, and electric resistance heating means in said chamber, embodying au insulating material ring secured in said chamber around said throat and an electric resistance coil Within and extending around said insulating material ring and Vcarried thereby.

, 1l. A heating ring for an electric heating appliance, embodying a trough like rear annular section, and a trough-like front annular section, said sections being secured together with the open sides' oftheir` troughsl together to form an enclosed annular chamber surrounding a longitudinal air heating bore', and electric resistance heating means in said chamber'and embodying an insulating ring surrounding said bore and secured in the trough of one of said sections and provided with and carrying an electric resistance coil. A

l2. An electric heating appliance, comprising a hollow ceramic housing forming an air tunnel, .an air heating ring in the front end portion of said tunnel, and a blower in the rear end of vsaid tunnel to draw a-ir thereinto and force the same through and from the tunnel, said ring being spaced forwardly from the blower and forming an annular baile in the tunnel and a central longitudinal air throat, said ring forming an. annular chamber surrounding 'said throat, and electric resistance heating means within said chamber.

Signed at Washington, D. C., this 8th day of November, 1923. I

tno sions.

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