US1569415A - Electric-furnace heating unit - Google Patents

Description

Jan. 12 1926 1,569,415

J. c. WOODSON ELECTRIC FURNACE HEATING UNIT Filed Jan. 25, 1924 WITNESSES! OR MW 555 C: [4600 50 LVM Patented Jan. 12, 1926.

UNITED STATES v 1,569,415 PATENT .OFFICE.

JAMES C. WOODSON, OF EAST PITTSBURGH, EENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

ELECTRIC-FURNACE HEATING UNIT.

Application filed January 25, 1924. Serial No. 688,377.

To all whom it may concern: Be it known that-I, JAMES C. WOODSON, a

citizen' of the United States, and a resident of East Pittsburgh, in the county ofvAllegheny and State of Pennsylvania, have invented a new and useful Im rovement in ity heating unit that shall have both terminals located at each end thereof.

Another object of my invention is to pro vide a heating-unit of the above indicated character that shall have a unitary terminal and supporting structure.

In practicing my invention, '1 provide a resistor member of relatively heavy wire or rod, preformed to comprise. a plurality of parallel-extending, return bent straight portions, one-half of said portions being folded,

back over and lying adjacent to the other half thereof. A plurality of sets of refractory members of electric-insulating material are located on metal rods extending through a perforation therein and have a plurality of pockets in one surface thereofto' receive the rounded ends of the resistor member.

.Metal side bars, substantially coextensive with the metal rods, extend closely adjacent to-the outer grooved surface of the refractory members and interfit with the rods'adjacent to the ends thereof.- End bars operatively engage the ends of the rods and of the side bars ,to constitute therewith the skeleton supporting frame.

The rods extending through the perforated refractory members have the respective ends of the resistor member connected thereto and' thereby provide terminal memhers at each end ofthe unit.

. vIn the single sheet of drawings;

rel is a view, inside elevation, of

an e ectricheating unit embodying my in.- vention, and

Fig'. 2 is a view, partially end elevation and partially section, taken on the line IIII of Fig. 1.

relatively heavy resistor member 12 that is rality of straight, substantially parallel-extending return-bent portions. The resistor member 12, preferably of a suitable resistor material, such as nichrome, is preformed to such shape that all of the straight returnbent portions lie in a single plane. .One half of the straight return-bent portions is folded over against the other half thereof and is located in a plane spaced from and cosely adjacent to the plane of the first half. This bending may be'done by twisting one or twoadjacent straight portions or by bending one 'of the rounded end portions. A p urality of refractory supporting members 13, of electric-insulatinglmaterial, are each provided with a plurality of sets of spaced pockets 14 therein, the pockets extending longitudinally of the members 13 in the inner face thereof. The rounded portions of the reistor member 12 fit into the respective pockets 14, the spacing of the resi'stor member and of the pockets beingsuch as to permit of this relatlve location.

- The length of the return-bent portions of the resistor member 12 is slightly less than the distance between the bottom portions of the respective pockets 14 in the spacedapart sets of refractory members 13 to permit of rounded.

' The rod 16 and the respective members 13 i of refractory material located thereon are therefore interfitting and any lateral turning movement of the me bers'13 on the rod 16 is efie'ctively precludiiii by such interfit- .m 9

i The outer longitudinal surfaces of each of themembers 13 is provided with a rela tively *wide groove or depression 17 and a bar 18 of relativelythin, fiat metal, is lov oated therein to further strengthen the An electric heating unit 11 comprises a.

structure and to still further prevent relative movement of the members 13 on the bar 16 and to hold the members 13 thereon,

even if any of the members 13 should break conductors (not shown) terminal rod members 16.

. embodyin strong ske eton frame for holding all of theor crack. The end portions of the. bars 18' are bent at substantially right angles to the main portion and are each provided with an I opening '19 therethrough within which is located a bushing 21 of a suitable refractory electric-insulating material, through which the rounded endportions of the rods 16 extcnd.--

End bars 22, of metal, have openings 23 extending laterally therethrough, through which the bushings 21 may extend, the bars 22 being so located as to operatively'enga'ge the turned-over end portions of the bars 18. Washers 24c and nuts 25 are provided for each end of the rod 16 to permit of securely clamping the bars 22 against the turned-over end portions of the respective bars '18, substantially as illustrated in Fig. 1 of the drawings thereby providing asupporting structure ofskeleton formand of substantiall rectangular contour.

" -T e hereinbefore described method of preforming the resistor member 12 brings both end portionsof, the resistor member at one end ofthe heating-unit, substantially as'il- 'lustrated in Fig. 1 of the drawing, and'the clearance-allowed between the outside end of the end members 13 and the inside of the bushings 21 'issufiicient at that end of the heating unit to permit of properly securing the ends of theresistor member to the re spective rods 16. As the rods 16 extend along the side ofthe assembled heating unit and beyond the skeleton frame structure, and as the rods 16 constitute terminal members for the heating unit,'both terminals of the heating unit ex- .tend therebeyond at both ends thereof.

Extra nuts 26 are provided on the outer end of each of the rods 16to permit ofsuitably securing the ends of supply circuit to the respective ;The device embodying my invention thus provides a relatively simple and compact eating unit having a doublelayer winding of-"i'esistor material, whereby the capacity thereof is substantially doubled relatively to a heating'unit having j only. a single layer winding. Thehereinbefore described construction further provides a heating unit a lelatively simple and yet ends of sai nation, a relatively heavy resistor member,

preformed to comprise a plurality of substantially parallel-extending, return-bent, straight portions, a plurality of spaced sets of refractory members, of electric-insulating material, each having a plurality of spaced pockets in one face thereof for receiving the return-bent parts. of said resistor member and having an opening extending longitudinally therethrough, and a rod extending through the-openings in the refractory members of each set for supporting them in proper operative positions.

2. In an electric heating unit, in combination, a relatively heavy resistor member, preformed to comprise a plurality of substantially parallel-extending, return-bent, straight portions, a plurality of spaced sets of refractory members, of electric-insulating material, each having a plurality of.

spaced pockets in one face thereof for receiving the return-bent parts of said'resistor member andhaving an opening extending longitudinally therethrough, and a rod extending through theopenings in the refractory members of each set for supportlng them in proper operative positions, each of said rods having one end of said resistor .member connected thereto and serving as a terminal member for said heating unit.

3. In an electric heating unit, 1n combinat1on,a relatively heavy resistor member, preformed to' comprise a plurality of substantially parallelextending, return-bent, straight portions, a plurality of spaced sets of refractory members, of electric-insulat ing material, each having a plurality, of

- spaced pockets in one face thereof for receiving thev return-bent parts of said resistor member and havingan opening extending longitudinally therethrough, a rod extending through the'openings in the refractory members of each set for supporting them in Lproper operative positions and a skeleton frame, of metal, opcratively engaging the ends of said rods to hold them inproper" operative positions.

4; In an electric heating unit, in combination, a relatively heavyresistor member, preformed tocomprise a plurality of substantially parallel-extending, return-bent, straightportions, a plurality of spaced sets of refractory members, of electric-insulating material, each having a plurality of spaced pockets in one face thereof for receiving the return-bent parts of "said resistor member and having an opening extending longitudinally therethrough, a rod extend ing through the openings in-"the refracto members of each set. for supporting them in properv operative positions, and a skeleton metal frame having sidemembers operativesaid refractory members andthe rods for holding them in proper 1y engagingi operative positions.

,5. In an electric heating unit, in combination, a relatively heavy resistor member, preformed to comprise a plurality of substantially parallel-extending, straight portions, a plurality of spaced sets of refractory members, of electric-insulatin'gmaterial, each having a plurality of spaced pockets in one face thereof for receiving the return-bent parts of said resisitor member and having an opening extending longitudinally therethrough, a rod extendmg through the openings in the refractory'members of each set for supporting them in proper operative positions'and a skeleton metal frame having side members interfitting' with said refractory members and operativcly engaging said rods to hold them in proper operative positions.

6. In an electric heating unit, in combination, a relatively heavy 'resistor member, .preformed to comprise a plurality of substantially parallel-extending, return-bent, straight portions, a plurality of spaced sets of refractory members, of electric-insulating material, each having a plurality of spaced pockets in one face thereof for receiving the return-bent parts of said resistor member and having an opening extending longitudinally therethrough, and a rod, of polygonal cross-section, extending through the openings in the refractory members of each set for supporting them in abutting, alined position and for preventing a turning movement thereof on said rod.

7. In an electric heating unit, tion, a relatively heavy resistor member, preformed to comprise a plurality of substantially parallel-extending, return-bent, straight portions, a plurality of spaced sets of refractory members, of electric-insulating material, each having a plurality of spaced pockets in one face thereof for receiving the return-bent parts of said resistor member and having an opening extending longitudinally therethrough, and a plurality of substantially co-extensive members respectively extending through, and closely adjacent to, each set of refractory members to hold them in proper operative positions.

8, In an electric heating unit, in combination. a relatively heavy resistor member,

return-bent,

in combina preformed to comprise a plurality of substantially parallel-extending, return-bent, straight portions, a plurality of spacedsets of refractory members, of electric-insulating material, each having a plurality of spaced pockets in one face thereof for receiving the return-bent parts of said resistor member and. having an opening extending longitudinally therethrou'gh,,and a plurality of substantially co-extenslve elongated metal members, having intcrfitting ends, and respectively extending through and closely adjacent to, each set of re ractory members to hold them in proper operative positions.

9. In an electric heating unit, in combination, a relatively heavy resistor member, preformed to comprise'a' plurality of substantially parallel-extending, return-bent, straight portions, a plurality of spaced sets of refractory members, of electric-insulating material, each having a plurality of spaced pockets in one face thereof for receiving the return-bent parts of said resistor member and having an openlng extending longi- .tudinally therethrough, a plurality of elongated metal members having interfitting ends and respectively extending through and closely adjacent to, each set of refractory members, and end bar members operatively engaging said elongated members adj-acent to the ends thereof to constitute therewith a skeleton supporting frame, for said refractory members and said resistor member. 7

10. In an electric heating unit, the combination with a resistor member preformed to have a plurality of return-bent portions,

of a refractory lnsulating member having a longitudinal opening therein and pockets in one face thereof for the upper returnbent portions of the resistor, a similar refractory insulating member for the lower return-bent port-ions of the resistor, and a rod extending through each of the refractory insulating members constituting a terminal and supporting member for the unit.

In testimony whereof, I have hereunto subscribed my name this 21st day of January 1924. Y

JAMES J. WOODSON.

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