US885769A - Element for electric heaters. - Google Patents

Description

' No. 885,769. l lATBNtrED APR. 28.1908.

. A. A. Low a; H. HERTZBBRG. BLBMBNT'POR ELECTRIC HBATERS.

APPLICATION I-ILED MAY 4. 1907.

l: 5 v. l

UNITED 4STATES* ABBOT LOW, OF HORSESHOE, AND HARRY HERTZBERG, OF NEW YORK, N. Y.; SAID PATENT OFFICE.

HERTZBERGfASSIGNOR TO SAID LOW.

vspecification of Letters Patent.

Patented April 28, 1908.

Application filed lay 4, 1907. Serial No. 331,874.

T0 all whom it may concern:

Be it known that-we, ABBorAUGUsrUs lLow and HARRY HERTZBERG, citizens of the United States, residing at Horseshoe, St. Lawrence-count? State of Newf-York, and the city of New -ork, borough of Brooklyn, county of Kings, and State of N ew York, respectively, have invented a certain new and useful Element for Electric Heaters, of which the following is a specification.

his invention 1s an element'for electric heaters, and the object in view is to overcome the tendency of a carbon resistance tb -lakef' or chip under the heat developed vtherein by an electrical current.

'It is well known to those skilled inthe art that a .solid piece'or blck of carbon when heated b an electric current will, after a comparative y short time, deteriorate to. such an extent as to seriouslyimpair its efficiency.

. To overcome the foregoing'objections, and

to attain thevobiects of` this invention, we provide a heater-element. conlpsled ci a plurality oi "sections held together and .in electrical contact by suitable means, such as a core of insulating material composed of one or more asbestos cords or' strands.

draw1ngs, We have In the accompany illustrated one practica embodiment of the invention, but the construction shown therein is to-be understood as illustrative only,

and not as defining thel limits ofthe invention.l

Figure 1 is ya side elevation .of a heaterelement or unit embodying this invention.

Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1-. Fig. 3 is a cross section on the line 3-3 ofFig. 1. is a side view illustrating another embo iment of vthe in` vention, Fig. 5 is an endview of Fig. 4.

- Figs. 6 and 7 are side and end views, respectively, of another yform`of heater-element'.

8 is -a longitudinal section through an- F' :other form ofthe heater-element.

`'In the construction shown in Figs. '1, 2

. and 3 of the drawings We have representeda heater-element or unit, A, composed 'of niem- V member, B, is a piece of electrical resistance bers,B, and an insulating core, C, C. Each material, preferably a molded .block of carbon. The blocks forming the members of the heater unit may be of any suitable shape 'and size, as for example, each block may Fig. 7 or they may be of any other desired cross section. As shown in said Figs: l, 2 andl 3; the blocks, B, are provided with a plurality of openings, b, and through these openings vare passed the cords forming the core, C, C', wherebythe members are threaded on Isaid core. Each core consists of a suitable insulating material, such as a cord composed of asbestos or other ap ropriatesubstance. The cords operate to ho d or conne the car- Ibon blocks, B, in electrical contact one with the other, and it is preferred to coniine said blocks in such close contact as to obviate the formation of spark gaps between the members when an electric current is passed through the resistance or heater unit: may be provided with anysuitable means for holding the blocks against sliding movef ment, but as shown the drawings, We em ploy metallic terminal plates, D,'ada ted toe fastened in any. suitable Way on the cord ,or cords, C, C', whereby provision is made for tle attachment of the wires, E, E', Aof an. electric circuit.

The construction of the element or unit shown in Fig. 4 isquite similar to that here- -tofore described. A suitable number4 of molded blocks, B', are employed, each block having a single opening, b. It is evident that the blocks may be square, round or C, composedv of asbestos or `other ap ro- Vpriate' insulating material. The cor is shown as having metallic terminals, yD to .which are connected the electric conductors.

In the form of the heater element shown in Fig. 8 of the drawingswe employ the series 'other desired cross section, .and that the blocks are assembled to receive a single core,

of .members B2 on the 'core C, in connection with the metallic terminals to which the leading wires are attached. [Said element is, however, adapted to'y be doubled soas to assume the shape, substantially, of the letter 'U,' and it -sis .mcased by suitablev incasing materiaL'indicated at F. This incasing ma-A terial is preferably of/[a heateabsorbing nature, "and itis molded around the element" soas-to form pa'rtther'eof. Having thus fully described the invention,

whatwe claim as new., and .desiretogsecure 105 by Letters Patent is;

1. An element for electrical heaters com`` prising a'pluality of 4perforated blocks each` composed of molded carbonaceous material,

said blocks being assembled with their faces 110 in direct engagement with each other7 a core composed of a strand of non-combustible material which extends through said perforations of the blocks, and metallic terminal members secured on saidcore and en aging with the end blocks of .the series of locks for clampin the latter in Contact firmly with each ot er.

2. An element for electrical heaters comprising a series of perforated molded blocks com osed of resistance material, each of said bloc's having a lurality of openin s, a plurality of'paralleFstrands compose of electrical insulating and non-combustible material, said strands extending through the openings of said blocks, and metallic terminal members each secured on said strands and engaging the end blocks of the series of blocks, said terminal members clmnpin the series of blocks firmly in contact Wit each other.

3. An element for electrical heaters comprising a pliable core composed of a strand of nom-combustible and insulating material,

a series of members composed of resistance material and threaded on said core, metallic terminal members secured on the. core and operating to exert pressure on the, members for clamping the latter in direct engagement, and a mass of heat absorbing material i11- casing said members and the core.

- 4. An element for electrical heaters vcomrisin a core of insulating and noncom- Bustib e material, blocks composed of resistance material and threaded on said core, metallic terminal members adapted to vclamp said blocks into engagement with each other, and a mass of molded heat absorbing mate, rial permanently incasing said members.

ln testimony whereof We have signed our names to this specification in thepresence of two subscribing Witnesses.

ABBOT A. LOW. HARRY HERTZBERG.

Witnesses:

JosEPH F. GARCIA, GEO. WELLING GIDnINGs.

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