Dec. 31, 1946. ,E_ ‘L WIEGAND 2,413,536 ELECTRIC HEATER Original Filed Aug. 23, 1941 2 Sheets-Sheet 1 ~ . [aw/N L. VV/EGHND INVVENTOR BY MWi/m AT TORNEYS Dec. 31,1946. ' E. L. WIEGAND ' 2,413,536 ELECTRIC HEATER ' Original Filed Aug. 23, 1941 2 Sheets-Sheet 2 F/G. 7 56.4 45, a 4? 16 J ‘’ [aw/N A. mesa/v0 INVELJJ' R BTM WW . ATTORNE‘fé 2,413,536 Patented Dec. 31, 1946 UNITED STATES PATENT OFFICE 2,413,536 ELECT-RIC HEATER Edwin L. Wiegand, Pittsburgh, Pa., assignor to Edwin L. Wiegand Company, Pittsburgh, Pa'., a corporation of Pennsylvania Original application August 23, 1941, Serial No. 408,073. Divided and this application Decem ber 9, 1942, Serial No. 468,382 6 Claims. (Cl. 219—37) 1 My invention relates to electric heaters, more particularly to electric range units, and the prin 2 source of, say 220 volts, in such manner that either one or both may be energized, the elements cipal object of my invention is to provide new and improved electric heaters of these types. This application is a division of my copending herein shown are designed to provide 2000 watts when both are simultaneously energized. The element H is so designed that when it only is application Serial Number 408,073, ?led August 23, 1941. wattage will be spread out over a considerable energized, it will provide 1400 watts, and this area, but with some concentration at the center. In the drawings accompanying this speci?ca The element 10 is so designed that when it only tion, and forming a part of this application, I is energized, it will provide 600 watts. 0f course, 10 have shown, for purposes of illustration, one form the wattages will be in relation tc_the voltage which my invention may assume, and in these used, and in the embodiment it is possible to have drawings: other heats. For instance, if 110 volts were used, igure 1 is a plan view of an electric range the elements H) and H herein disclosed are so unit illustrating an embodiment of the invention, designed that when both are energized they will Figure 2 is a bottom plan view of the embodi provide 500 watts; when the element H only is ment, drawn to a smaller scale, energized, it will provide 350 watts; and when Figure 3 is a side elevation of the embodiment, the element It’! only is energized, it will provide Figure 4 is a bottom plan view, the reflector be 150 watts. Also, it will be apparent that it is ing omitted to better illustrate certain of the 20 possible to employ a switch connected to different parts, voltages, as for example 220 volts and 110 volts, Figure 5 is a sectional view corresponding gen and so designed that the elements may be singly erally to the line 5-5 of Figure 4, or together energized with either voltage. Figure 6 is a fragmentary sectional view corre The element I0 has end portion m, 722. and sponding generally to the line 6-0 of Figure 5, 25 the element II has end portions 113. 104. Each of and the end portions terminates in a connection ter Figure '7 is an enlarged sectional View corre sponding generally to the line '|-'| of Figure 5. minal, respectively numbered Hi. 15. i5. and H, H. As herein shown, each element comprises which may be housed in a suitable insulating block or housing !8. The terminals !5 and iii are here shown bridged by a bridge plate l9, and the connection terminals may be connected to a a tubular metal sheath within which is disposed electrical resistance heating means 12. embedded means of a proper electrical switch (also not in refractory electrical-insulating heat-conduct shown). The electric heater or range unit embodying my invention may comprise one or more heating elements, in this instance two elements In and ing material i3. The insulating material 13 may be in the form of suitable granular, comminuted, or powdered refractory material, preferably com pacted to a dense hard condition. Each of the elements I!) and H has an active portion which is preferably triangular in cross section, as best shown in Figure 5, and the active portion of each element is of generally spiral form. Referring particularly to Figures 1 and 4, it will be noted that the element l I has a central portion wound about itself for one turn, and the remainder of the active portion of the element H is then intercalated with the element I0. Therefore, the element II has portions disposed side-by-side and then has portions disposed side-by-side with portions of the element l0. vThis particular construction makes possible a distribution of heat not attainable with struc tures of the prior art. For example, assuming that the elements l8 and II are electrically connected to an electrical source of electricity (not shown) through the The end portions 121, m. m, m are all of sub stantially circular or rounded section, to facili tate bending. and preferably only the spiral por tions of the elements are of triangular section. The elements such as may be embodied in the range unit herein shown may initially comprise a tubular sheath of substantially circular cross section into which the resistor and insulating material have been introduced endwise. and may have their active portions side-pressed in suit able dies to a desired triangular cross-section, and the element may be press-forged as set forth in my conending application Serial Number 361997, filed October 21, 1940. Accordingly, the active portion of each heating element H0 or H comprises a tubular sheath having two walls 20, ‘2 I, the major portions of which are flat and make between them an angle of approximately 60°, these walls merging in a rounded apex 22. The upper wall 23 is substantially entirely ?at and makes with the walls 20, 2| angles of 60° respectively. 2,413,536 3 4 In the embodiment shown, the ?at portions of the walls 2!}, 2! are respectively of less cross-sectional extent than the substantially entirely ?at upper wall 23. As best seen in Figure 5, the upper walls 23 lie in a common plane. Therefore, if an object, such as a cooking vessel, is placed upon the heat clip having a tongue 39 extending downwardly generally along a surface of the arm 21, ex tending through a respective slot 31 and having its, extremity bent upwardly, as best seen in Figure 7. Thus, the elements H], II are held against substantial movement toward or away from the supporting means 25. ing means comprising the heating elements M, l l, Desirably, the slots are elongated in a radial direction, and in this direction are longer than the width of the walls 23, and therefore is in excellent heat-con 10 clips 38 to allow for relative movement of the ele ducting relation with respect to a relatively large ments in a plane de?ned by the upper margins area of the heating means, so as to-be heated of the arms 21 through 32, so as to accommodate the vessel will be in contact with the ?at upper ’ mainly by conduction. The generally down for expansion and contraction of the heating ele wardly facing lower walls 26, 2| of each heating ments. In this manner, binding, straining, or element radiate some heat diagonally downward 15 warping of the parts is prevented. ly in respectively opposite directions, considering any given portion of an element, and this heat is re?ected upwardly by a re?ector 24 which gen—‘ erally underlies the heating elements I9, ll. The extremity of the arm 28 is formed with a projection til ?tting into an aperture 4| in a bracket 452. The bracket 42 is longitudinally curved, as best seen in Figure 4, and at its lower The end portions 101, a, pg, 104 extend down wardly from their respective active portions, and then have their respective extremities bent slightly upwardly toward the insulating block [8, thus forming a drip point 25, best shown in Fig 20 extremities is provided with ?ngers 43 extend ing inwardly of the range unit, and terminat ing in upwardly directed ledges 44. An upper side margin of the bracket 42 has an angular extension 45 upon which the apex of the ele ure 5 with reference to the portion 193. Prefer 25 ment It, adjacent the end portion 122, rests, thus ably all the end portions are brought together at supporting this part of the element ll), since it an edge of the range unit, as herein shown, so that external electrical connection thereto is facilitated. . is spaced a substantial distance from the arm 32. The lower margin of the bracket 42 is formed with a curved recess 46 (see Figure 6) to Tracing the various portions of the elements, 30 pass the adjacent parts of the end portions 101, 102, and starting with the portion 173 of the element an, 114, and the adjacent parts of the end por-. II,’ it will be seen that the portion 203 extends tions p1, 1174 bear against the de?ning margin toward the center of the range unit, upwardly of therecess 46 for the purpose of steadying to the active portion, and the active portion is and aiding in the support of the heating ele wound about itself at the center at least once, as 35 ments H), i l. A ground screw 41 is threaded into shown at 115, and then has an intermediate por a tapped aperture formed in the bracket 42, and tion 736 spiralling to the end portion 124. The is adapted to receive a conductorwhich may element ill starts with the end portion 101 extend be grounded to a suitable ground, such as a ing upwardly to its active portion, and this active stove frame or the like. portion is intercalated with respect to the active Circumscribing the outer ends of the arms of portion of the element ll, except at the central the supporting means 26 is a ring 58, having a portion 105, and terminates in the end portion 122. _ cylindrical portion £59 merging with an annular The apexes 22 of the heating elements Id and portion 50 in turn merging with a downwardly II de?ne the under side of the active portion of the heating means, and this under side is mount 45 extending cylindricalr?ange 5|, adapted to en gage a range top (not shown). The arms 21,35, ed upon'a supporting means 26, which may be a and 32 are longer than the other arms, and the grating or grid comprising a plurality of general longer arms are provided with projections '52 ly radially disposed arms 21 to 32 inclusive. ‘In. forming shoulders withthe respective arm, the the embodiment shown, the supporting means 26 comprises a straight sheet-metal member, pro viding the arms 21, 28. The arms 29, 30 are formed by a sheet-metal member bent so as to form a'central generally U-shaped bight 33, and the arms 29, 30 extend from this bight in gen erally V-shaped relation with respect to each other. Likewise, the arms 3!, 32 are formed by a sheet-metal member bent so as to form a central generally U-shaped bight 34, and the projections being adapted to engage respectively in apertures 53 formed in the cylindrical portion 49,- and the shoulders being adapted to bear against the adjacent inner peripheral surface of the cylindrical portion, so that the ring'48 is adapted to support the supporting means 26. The arm 2?, adjacent its extremity, is provided with a downwardly extending hook 54. As here shown, the hookis a separate piece and is spot welded to the arm 21. The hook 54 has anin arms 3!, 32 extend from this bight in generally V-shaped relation with respect to each other. 60 clined surface 55 terminating in a hook~tip 56. The re?ector 24 is disposed below the support The bights 33, 3d are fastened to opposite sides ing means 26, and as best shown in Figure 5, is of the sheet-metal member forming the arms of generally conical form, or to describe it dif 21, 28, as by means of rivets 35. If desired, all, ferently, is generally dish-shaped, with the open or‘certain of the arms may be provided with stif ing of the dish directed toward the supporting ~ fening ribs, as indicated by the numeral 36. . Means may be provided to hold the heating 65 means 25. The peripheral margin of the re ?ector 24 is formed with a downwardly oii‘set means comprising the elements H], H in desired. curved portion 51, and the re?ector, in line with assembly-with the supporting means 26. In the the hook 541, is formed with a slot 58 of'a length embodiment shown, this means comprises a plu rality of slots 3? formed in the arm 27, each 70 to pass the hook 54. The re?ector 24 has a pocket 59 of generally U-shaped cross-section, as best slot generally underlying the section of the re seen in Figure 6, the bottom wall of the pocket spective heating elements traversed by the arm extending radially inwardly, and merging with 27, as best seen in Figure 5. A plurality of clips the reflector wall adjacent a central opening 60 38 are secured to the apex of each element in, H- adjacent the arm 21, as by spot welding, each 75 formed in the re?ector 24. On either side of the pocket 59, the re?ector wall isformed with up 2,413,536 5 adjacent said curved marginal surface for pass ing said hook portion and a pair of upwardly pressed areas spaced to correspond to the spacing of said ledge means, the construction being such wardly pressed areas 6|, positioned so that the recess surfaces thus formed are adapted to re ceive respective ledges M. The hook 54 and the ledges M provide hanger means from which the re?ector is adapted to be hung. The re?ector 2a is adapted for assembly and disassembly with respect to the supporting means that the recess surface formed by the upwardly pressed areas receives and rests on said ledge means and said hook portion extends through said reflector means aperture and engages the by movement generally edgewise of the support adjacent under surface of said curved marginal ing means. For example, to assemble the re surface and holds said re?ector means in assem ?ector 2:3 with the supporting means 25, the re 10 bled position with said supporting means. ?ector 2a is moved in a direction generally paral~ 2. An electric heater, comprising: electrical lel to the bottom edges of the arms 2'! to 32 so heating means; supporting means, supporting that the pocket 59 moves to cover the adja said heating means; connection means, con cent parts of the end portions 111, 392, p3, and 2a.. structed and arranged to connect said heating and the reflector is moved a distance suf?cient means and said supporting means, and to hold to align the slot 58 with the hook 5d, at which them against substantial lateral movement; re time the re?ector is lifted slightly to pass the ?ector means, generally underlying said heating hook through the slot, and the re?ector 24 is means; and holding means, normally holding said again moved slightly in the ?rst direction until re?ector means assembled with said supporting the recess surfaces formed by the upwardly means, comprising substantially stationary por pressed areas 5! align with respective ledges it. tions normally underlying portions of said re At this time, the re?ector is permitted to hang, ?ector means supporting said re?ector means on with the recess surfaces of the upwardly pressed said holding means, and said holding means and areas resting on the ledges 44, and the re?ector said re?ector means being constructed and ar surface adjacent the slot 58 resting on the hook ranged to permit relative lateral movement of surface 55. The hook-tip t3 bears against the said re?ector means to bring respective portions offset margin 51 of the re?ector, and the hook out of opposition and thus permit said re?ector surface 55 is inclined, so that either or both means to be moved substantially perpendicularly prevent unintentional reverse disassembly move away and thereby disassembled from said sup ment of the re?ector. To disassemble the re porting means. ?ector 24 from the supporting means 26, a re 3. An electric heater, comprising: electrical versal of the assembly movement is necessary. heating means; supporting means, supporting As best seen in Figure 5, the peripheral mar said heating means; connection means, con gin of the re?ector 2% is spaced from the cylin structed and arranged to connect said heating drical wall 49 of the rim 48, to provide a sub means and said supporting means, and to hold stantially annular air opening 62 (except at the them against substantial lateral movement; re pocket 55!) so that air may enter this space ra ?ector means, generally underlying said heating means; and holding means, normally holding said dially inwardly and proceed upwardly through the grating and heating element assembly. The re?ector means assembled with said supporting means, comprising substantially stationary por downwardly inclined wall of the re?ector 24 provides a drainage surface for any substances spilled on the re?ector, and these substances may tions normally underlying portions of said re?ec tor means supporting said re?ector means on said drain through the central opening M, which opening also provides an additional air open ing. holding means, and said holding means and said 45 re?ector means being constructed and arranged A central medallion 63, or the like, may be provided to cover a desired amount of the space at the center of the heating means. As here shown, the medallion t3 rests on the upper edges of the arms 21 through adjacent the bight portions 355i, and has marginal extensions, forming four legs 64, which are secured to the side surfaces of the bight portions 33, 34 in any suitable means, as for instance by spot welding. From the foregoing it will be apparent to those skilled in the art that I have accomplished at least, the principal object of my invention, and it also will be apparent to those skilled in the art that the embodiment herein described may be variously changed and modi?ed, Without depart no to permit relative lateral movement of said re ?ector means to bring respective portions out of opposition and thus permit said re?ector means to be moved substantially perpendicularly away and thereby disassembled from said supporting means; said re?ector means and said supporting means including portion-s interengaging when said re?ector means is in assembled position and constructed and arranged thereupon to resist said relative lateral movement of said re?ector means. . 4. An electric heater, comprising: supporting means; electric heating means mounted upon said supporting means; a re?ector; means for ‘ carrying said re?ector in position below said sup porting means, including a plurality of ledge means carried by and below said supporting means and interengageable with underside por not herein speci?cally described; hence it will tions of said re?ector, at least one of said ledge be appreciated that the herein disclosed em means being provided by the jaw portion of hook bodiment is illustrative only, and that my inven means having a neck portion extending through tion is not limited thereto. an aperture in said re?ector, and said plurality I claim: of ledge means and said re?ector being relatively 1. An electric heater, comprising: electrical so constructed and arranged that said re?ector heating means; supporting means, supporting said heating means, having a pair of spaced 7 1.) may be assembled with and disassembled from said ledge means solely by relative bodily move apart ledge means, and a hook portion, spaced ment of said re?ector with respect to said ledge from said ledge means; re?ector means, gener means and generally edgewise with respect to ally underlying said heating means and said sup ing from the spirit of the invention, and that the invention is capable of uses and has advantages porting means, having a curved marginal sur face, said re?ector means also having an aperture said grid means. 5. An electric heater, comprising: supporting 2,418,536 means; electric heating means. mounted upon said supporting means; a re?ector; ‘and hook means for carrying said re?ector in position below said'supporting means, said hook means and said re?ector being relatively so constructed and ar ranged that said re?ector may be assembled with and disassembled from said hook means solely by relative movement of said re?ector with re spect to said hook means generally edgewise with respect to said supporting means, said hook means comprising a plurality of circumferentially spaced depending hooks having jaws for receiv ing circumferentially spaced portions of said re ?ector, said jaws all extending in the same gen eral direction. 6. An electric heater, comprising: supporting means; electric heating means’ mounted upon said supporting means; a re?ector; and hook 8 means for carrying said re?ector in position below said supporting means, said hook means and said re?ector being relatively so constructed and ar ranged that said re?ector may be assembled with and disassembled from said hook means solely by relative movement of said re?ector with re spect to said hook means generally edgewise with respect to said supporting means, said hook 10 means comprising a plurality of circumferentially spaced depending hooks having jaws for receiv ing circumferentially spaced portions of said re ?ector, said jaws all extending in the same gen— eral direction, a plurality of said hooks having neck portions outside of the outer periphery of 15 said re?ector and at least one of said hooks hav ing a neck portion extending through an aperture in said re?ector. EDWIN L. WIEGAND.