US 1049488 A
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G. A. HUGHES & T. M. UAVEN. ELECTRICAL HEATING DEVIGE.
APPLICATION EXLED JUNE 11, 1910.
1,049,488. Patented Jan. 7, 1913.
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ML (8 Q-MAVIPO VK/ I, g WA U. A. HUGHES & T. M. GAVBN.
ELECTRICAL HEATING DEVICE.
APPLICATION FILED JUNEII, 1310.
Patented J an. '7, 1913.
2 SHEETS-SHEET 2 STATES PATENT oration i i 1 r GEORGE A. AND TREVOR M. CAVEN, OF CHICAGO, ILLINOIS, ASSIGNOIRS T0 HUGHES: ELECTRIC HEATING COMPANY, OF CHICAGO, ILLINOIS, A COBYORATIQIT .150 ILLIiiOI 7 '0 all whom, it may concern:
Be it known that we, GEORGE A. HUGHES and TREVOR Mg CAvnN, residents of Chicago, in the county of Cook and State of Illinois,
'5' have invented certain new and useful Im- =provements in Electrical Heating Devices,
of which the following is a full, clear, and precise specification.
Our invention relates to electrical heat- 10 ing devices, and concerns particularly an improved form of heating unit, the arrangement of such unit in a stove frame, and the electrical connections and control for the unit. i
Among the salient objects of our invention are to provide a heating unit which has a maximum heating efliciency with a minimum of Volume and surface; to construct the heating wire supporting block of the unitof material which is highly conductive toheat, so that this supporting block will quickly take on the heat generated by the windings to thereby relieve the windings of intense heat which might cause burningthereof, and to add its heat radiating surfaceto that of the windings; to provide a supporting base or block for the unit, which base or block is constructed of heat insulatingmaterial to thereby confine the radiation -01 heat from the unit block and windings to. objects set over the unit to be heated, to
' provide a plurality of resistance sections for the unit and improved electrical connections whereby said resistance sections can bet-put into circuit in various combinations to produceflow1 'degrees of heat, inter1nedi= "degreesf of heat, and high degrees of to provide improved terminal memonthe unit forthe resistance sections I mils for'detachable engagement with each ther so that the unit can be applied or removed from the stove frame without the necessity of disconnecting any wires or conductors, and so that the installation or removal of a unit will be automatically ac companied=by its connection with or disconnection from'the current supply circuit; and
in general to provide for improved construction and operation of devices'of the character referred to.
The nature of our invention is' clearly brought *out'in the following specification Specification 0! Letters 2 ate'nt.
mproved companion terminal members the supporting base, and to adapt the te'r- ELECTRICAL HEATING D'Evrcn.
Patented Jan. '7, 1913.
Application filed Junejl, 1910. Serial mi. 566,298.
and shown on the accompanying drawings, in which drawings.
Figure 1 is a perspective View of astove, showing a heating unit in place thereon, Fig. 2 is. plain view of. a heating-unit, together with circuit controlling arrangement therefor, and showing. the circuit-controlling switch mechanism in on'e position, Figs. Qfand 2" show the switch. mechanism in different positions,' Fig. 3 showsthe heating unit inside elevation andfthe 'inclosing block and part of the stove topin sectionon line Fig. 1, Fig. 4 is abottom view of the heating unit, 5'is a plan view of the supporting base, F1g. 6 is,-an end view ofa block partly in section, and showing-amodified construction, andfliigslfl and 8 are end views of part of aunit showing other modified constructions. j V
Referringto Figs? 2 and 3, block 1 of the heat-ing'nnitin the form of a rectangular plate having a centralv longitudinal ridge Q, and. at each side Of-illlS ridge is a plurality of narrower ridges substantially "semi-cylind -.1 t which accoinfriodate resist) ions in the form of wire coils. hejends the forming ridges terminate a distance short of the ends 7 of the block to leave fiat transeverse sections 6 and 7 'fotiaccommodating the various terminal screws 8, under whose headsthe ends of the resistance coils are seciii'di in elec trical contact, the heads of-thes screws being preferably belovi the uppe p l' ridges. Five such resistance [sections are shown at each side of the cent ridge 2, al-' though any number of such se trons could, of course, be provided.
In Figs. 2 and M between the resistance section ends, are'illusa trated. Referring to the resistance sections as a, b, c, d, e, f ,-g, h-, a and j,thfe sections at the circu it connections one end are connected as ,follows: and e, (Z Y and f,g and i, and 7?, and g; and. at ithe other .end the sections. areconneoted as follows: a and 0,5 and d, e and y, andl.f' and h, 'the various connectinginembers 9 bei g either in the form of wires orof bands, whose ends are electrically connected with *the'fterminal block, as shown in Fig. 4. A conductor plate screw/s8 by nuts- 10 on the underside oi". the
11 is held against the bottom of thebloch and in electrical contact with the terminal screw ofresistance'section aby means his nut 16,,
which plate -extendsjinwardly and is provided with a downwardly eitending contact pin 12. A similarconductor plate 13 is secured .to the terminal screwofresistance section b and has the downwardly extending contact pin 14, ,i-Two conductor plates 15 and 16 are connected together at one end ai'id support a downwar' 1y extending conr't'act pin LF-,the opposite ends of the plates The supportin being secured to the terminal screws of the resistance sections 2' and 7', these plates forming a direct connection between the outer ends of these sections. The contact pins 12,14 and 17 are adapted to engage with terin'inal jaws provided on the supporting base-18. Referring to Figs. 1, 3 and 5, this suppbrting base is of cylindrical outside contour and has a square central pocket 19 of substantially the same size as the heatin unit block, so that the heating unit bloc can be readily applied therein,-. as shown particularly in Figs. 1 and 8. At one corner of the pocket 19 terminal plates 20 and 21 are secured against the bottom of the pocket bymeans of screws 22 and 23 extgpd ing through the floor 24' of the supporting base and threading into the plates. The plate 20 mounts a spring jaw 24, and the plate 21 mounts a spring jaw 25, these spring jaws extending upwardly and in position to receive and to clamp the contact pins 12 and 14 of the heating unit. At the opposite corner of the supporting base. a terminal plate 26 is held against the bottom of the pocket by a screw 27 passing through the floor. 24 and threading into the plate, the end of the plate supporting a spring jaw 29 in position to receive the contact pin 17 on the heating unit. With this arrangement, when a unit is dropped into the supporting base, its contact terminals will engage with the terminal jaws, and electrical connection is thus automatically established, and upon the removal of the heating unit from. the base the contact pins are withdrawn from the terminal. jaws and the electrical connections automatically broken.
As shown in Figs. 1 and. 3, the top 30 of the stove S is deflected downwardly to form the cylindrical pocket 31 for receiving the supporting base. The supporting block 1 of the heating unit is preferably construct ed of"materia1such as quartz composition "which is highly conductive to heat, so that as the resistance sections are heated the material in the support-mg block will take on heat and thus relieve the resistance sections of intense heat which might result in burning out of the sections. supporting block will distribute theheat and will add to the total radiating surface of the unit. h ating unit tructed or heat insulating: asbestos. so as to, confine is, howev r mater "i the spring jaw zed heat to the resistance sec-.
tions and their supporting block, and to confine the generated heat to upward flow against the objects placed over the base to be heated.
The stove may be of any suitable construction. The formshown in ,Fig. l accommodates only one heating unit, but it isobyious that any number of heating units can be applied to dillerent. stoveconstructionaand,
that heating units may alsobe applied in ovens or other heating compartments, of the stove for baking, water heating, or other purposes,
By referring to Figs. 2 and 3 the supply circuit arrangement for the un'itcan be readily understood. .A switch A is shown comprising two blades 33 and 34 connected with the main supply conductors L411, the 1 blade 33 at its end having the arcuate ex tension 3;}. Contact buttons 36 and 37 and a contact plate 38 are provided for engage-- ment with the switch blades. The contact 5 buttons36 connects with the conductor 39 leading to t-he screw 22 connected with the and button 37 connects with conductor 40, which leads to screw 23 connested withkswitchjaw 25, while thecontact P ate 38 connects with conductor 41wvhich leads to screw 27 connected with spring jaw- 29. When the switch parts are in-theposit-i'on shown in Fig. 2 current will flow from the main conductor L through the switch blade 33, button 36, conductor'39,;- screw22,= spring jaw 24, contact pin 12, conductor plate 11 tothe terminal screw of windingv section a, then through resistance sections a, c, a, gand ,6,- throZghconduetor-a plates 15 and 16, then throu tact pin 14,.spr1ng jaw- 25, screw-s23, con-f line .L'.
h resistance-sections j, k, j, (Z and I) to conductor strip 13, con'+=- fore, all in series to offer the greatestr... amount of resistance and therefore togw 'a minimum degree of heat. If the; switchis moved to the position shown in Fig. *2". the, .switch' blade 33 through its fextlensionflfi'. remains in contact with the button 36. but.
the switch blade 34 leaves but-ton 37,aud en gages with thecontact plate 38,: and the; circuit will boas follows: from.thc main line.v L, switch'iblade 33, extension 35, buttrmailfiw conductor 39, screw 22, spring jaw 24, rc-= sistance sct-ionso, c, c, g andzi, conductor plate 15, contact pin 17-, conductor tl-,-con+ a switch blad -0 Jinc lhr With thisarrangement onlyoiie-halfiof .the
resistance Emotions are inserted andztheirea mt'crm sistance reducul onc-half to, giv
-l h ating conditions If thesivitchuis by its-ex .ensionJ 5;,
is preferably of t e same heat conducting dividing, part .of the current flowing through conductor 39 andresistance sections a, c, e, g and i to the contact pin 17 and the other part flowing through conductor 40 and through resistance sections b, d, f, h and j tothe contact. pin ,17, the current then returning through conductor 41, contact 38 and switch blade 34 to line L. With this arrangement there are two parallel circuits through the resistance sections, each including one-half of the resistance sections, and
we have the maximum heating conditions. Thus, by setting the switch to various posi-.
tions, minimum, intermediate or max1mum heatingconditions can be established. The switch mechanism can be of a construction as shown in Fi s. 2, 2 and 2", or in the form of a snap switc A (Fig. 1) or of any other suitable st le, and is preferably mounted on the stove i rame in any convenient glposition. Other combinations of the resistance sections and circuit could, "of course, be pro vided or added, and the switch mechanism correspondingly modified tobeactu'ated to are therefore, practically entirely exposed.
In". *ig. 6 I have shown a modified arrangement, which involves the application of a filler f in the grooves to partly or-wholly cover theresist'ance sections, and the filler material as that f the supporting block.
In the modification shown 1n Fig. 7 noridges or grooves are provided, the block being flat on both faces and the sections 5 bein molded or cast into the block preferab y near. the upper surface thereof, theheat from the sections being transmitted to the material of the block. Inthc modification in Fig. 8 the ridges and channels are provided, but the sections, instead of lying in the grooves, are molded or cast in the ridges near the apexes thereof In the heating mechanism-of our inven tion, as described, the units are of simple and of inexpensive construct-ion and produce the most eflicient heat conditions Jwith a minimum of weight and volume; Not only I ,do the resistance sections become heated, but
the entire supportin block forthe sections takes on heat to re ieve the sections, and.
this block, together with the sections, gives a maxi-mum radiating surface. The supporting base forlthe, unit, being ofheat insu-.
lating material, will prevent loss ofheat and will concentrate the heat against the objects to be ,heated. If a single resistance section'burnsout it can quickly be replaced by a new section, or the entire unit can be readily lifted from its base and replaced by a new one. By means of the switching mechanism various circuit combinations are provided for the sections to produce the desired heating conditions.
We do not desire to be limited to the forms and arrangements which we have both in construction and arrangement are possible which would still come within the. scope of our invention, and we therefore claim the following:
1. A heating unit for electrical stoves, comprising a supporting block formed of material of high heat conductivity, a plurality of individual resistance conductors on said block,-terminals on said block for said conductors, and cross connectors for said terminals for adapting said conductors for connection in vario combinations with a current su ply circuit.
2. In co material having high heat conductivity,a plurality of individual heating coils ar-' ranged on 'said block, terminals on said block for each coil, cross connectors on said block and connecting various coils in'elec trical relation, a source of cu1'rent, circuits for supplying current flow, from said source ination, a supporting block of shown and described, as other modifications v to said coils, and a sin 16 switch mechativity, a plurality of individual heating conductors supported on said block, and terminals on said block for said heating'conductors, said terminals being adapted for electrical engagement with the terminals in said pocket upon application of said block in said pocket.
4. In combination, a stove top having a depressiom a base block for saiddepression, said base block being'of heat insulating material and having a pocket, a supporting block fitting in said pocket, :1 plurality of individual resistance conductors on said sup porting block, terminals on said block for said resistance conductors, and electrical terminals mounted in said pocket and adapt" ed to be engaged by the terminals of said block upon application of the block in said Jpocket.
5. In electrical heating mechanism, the combination of a base formed of heat insulating material and havingsa pocket, elec-' trical terminal sockets mounted in said pocket and adapted for connection with a current supply source, a supporting block of material possessing high heat conducfivity, 'a plurality 'of individual heating con- In witness hereof, we. hereunto subscribe ductors supgot td in parallel on said block, our names this 3rd day of JuneiA D1910. and terrain; (mm on said blqckfor said heat GEORGE A. -.=HUGHES.-- conductors, smdfefininal j adapted TREVOR-M. CAV-EN." 5 for engagement with sa' film} 'sobkqts Vv'xtnesses: Y
in the pocket of said bake upon application 4 CHARLES J-ISCHMIDT, of said blok in said pocket. N ELLIE B. DpARBOnN.