US1297472A - Resistance unit. - Google Patents

Description

L. P. HYNVES. RESISTANCE UNITYI APPLICAIION HLED 11m11.191s.

. Patented Mar. 18,1919.

UNITED eiseres reirse/fr cerro.

LEE I?. HYNES, 0F CHXCAGO, ILLINOIS, ASSIGNOR TO THERXVIO ELECTRIC REGULATOR CD., 0F CHICAGO, ILLINOIS, .[*1 COROILTON 0F LLNOS.

RESISTANCE UNIT.

Specification of Letters Patent. Patntd Bleil'. 1S, 1919.

Application filed May 7, 1915. Serial No. 26,482.

To all 'whom t may concern:

Be it known that l., Les P. HYNns, a citizen of the United States 'of America, und

resident of Chica-go, Cook county, lllinois, present res. add., 7320 Princeton ave., have invented a certain new and useful Improvement in Resistance Units, of which the following is a specification.

My invention relates to resistance for use in electrical circuits, and more particularly to devices of this kind which are designed to be employed in exposed positions, as in making` uncovered connections for circuits employing heavy and dangerous currents, and which must, therefore, be suitably protected Vor covered.

Generally stated, the object of my invention is to provide a comparatively simple and inexpensive resistance unit of the foregoing general character7 and to provide a device of this kind which will be satisfactory and reliable in use, es Well as suie to employ in exposed places.-

A special object is to provide an improved construction and arrangement whereby e resistance unit. of this general character may be produced at a comparatively small cost o manufacture.

It is also en object to provide certain de tails and features of construction tending to' increase the general eliioiency end desiro- 'oility of e resistance device ofthis particular character, not only from the standpoint of actual use, but also with regard to the seltisfactory and low cost of production thereof. l l

To these und other useful ends my invention consists in matters hereinafter set forth and claimed.

ln the accompanying drawings-- Figure l is a longitudinal section or a resistance unit embodying the principles of my invention.

Fig. 2 is an end view of the device shown in Fig. 1.

Fig. 3 is a. cross Fig. l.

As thus illustrated, my invention comprises e. tube A of porcelain or similar insulating material, having; opposite ends c of any suitable shape. Wound on seid tube and thencoated with enamel C or other similar heat resisting und insulating material; This holds the coil firmly ill-place. For exemple, the tube A -aguinst outward displacement.

- preventing the section'on line 3-3 iu yThe resistance coil B is 'can be of hard baked or fired clay or pottery,

and may have the enamel C baked and vitrified thereon by any well known method. Thus the coil li is suitably insulated and embedded in the vitreous enamel coatin of the tube. Heads D of insulating and lect resisting material are provided with cylindrie recesses'zi to receive the ends of said asbestos preparations, or other simile-r sub-f' l stances, commonly used in the manufacture of electrical articles. vl perforated sheet metal cylinder F is erranged to inciose the resistance coil and extend over seid 'heads l), the end edges of said cylinder .being bent inward to form tlangesj which hold the heads Suid cylinder F is preferably formed from sheet metal and has a lap join-t G along one side thereof. The terminals b of the coil extend `around end into the ends of the tube A, washers H of asbestos wicking being interposed between the ends of said tube sind the heads. Conductors l of strand Wire are covered. with asbestos insulation z' and arranged to extend through `'the soles -ll und into said tube. Knots .i ere formed in these flexible conductors immediately inside the washers with the-ends oi? .seid conductors inside of said knots. "lhus the pull is on the knots J,

when the device is connected up or used, endifv not on the terminals of the coil'.

lt desired, cage F mcy have interior bedeif extending V immediately inside of the 'bends D, thus ward.

circumferentislly thereof letter from being pushed in' The seid coge constitutes. thesole means for holding'said heads D in .place onv the ends of theresistancc tube, end the-Xy washers H serve to cushion and' protect thefends et seid tube against breakage. :"lIn this way the `heelds D erenot conueoted'by any. thing extending through the tube'A, and thus (longer of short circuitingisy greatly reduced. y

For the broader purposes of'rny invention any suitable resistentie `mcy beinelosed withn in the cage F end held in place by said heads. But, the `form .of resistance coil shown and described. is suitable for the purpoee, and in euch ease the initie and bi-eakabile "tube A ie pireerabiy cushioned in the head@ te prevent breakage dwing manu- 'eeuie and afterward as Weil( Also, the

heads D and cage .F may beef any suitable or desired shape. v

Ae shown, ehe Wagners H are eup-eha-ped to eieetnaiiy -surieund the ende of lhe frangible lib-e A 'and hei'eby prevenibreakage when the device ie subjected ie shock or jar. The Washers can'be molded or made in this` shape, er they een be made ia, and soft and allowed te dew ein: at eheh: edges when he two heads D are-brought toward each other. .But these Washers aan he of `any suitable shape and ehazeeeir. y

I de not limit myself ie the exact, eenn Structien shown and dei'ibed.-

That I'. claim as my invenion isz- 1. A. neeietanee unit .comprising a i'esist-` ance element, insixlaeing heads for the pposite ends ef die resistance element, c0nneetiens extending through said heads te the reeieienee, and m'amineus cage having,f ineens te heid seid heads in piace, said cage heim; `specie/d.' from said, element, said ee -n'iensV comprising a breakable tube, and

` Ine-ansie? cushioning the ende of said tube Iin he heads, said cage preventing beth inward end outward dispiaeemeniA ef Said meiste-nee unit ,ieempiising a tubular resistance element, heads for the resistance element, means to connect said heads, and means to cushion the ends of said element in said heads, saidcushioning means; comprising cup-shaped Washers onv the ende of said element, said heads being cup-shaped. te heid said washes, and conductors exw tending through said Washersy and connected with adjacent ends of said element.

3. A resistance unit comprisingeppeeitely arranged cup-*shaped heads of insulation, a tubuiai' insistance-dement having' its ends dispoeed ineaid eup-shaped heads, said e1enient involving an enter coil and an inner tube o heat-:resisting insulation, said heads having n'ieans te cushion the ends of said tube therein, insulated conductors extend ing vceiim'aiiy through said heads and into the ends of said tube, each conductor being connected with. the adjacent end of said coil, and a eylindrie cage having openings in the sides thereof and provided with end p0rtions which extend beyond said heads, these end poiions of the Cage having integral means to hold the heads against. Ioothtilvl 'ward and 'outward dispacement, and to render removal of said heads impossible except by forcibly bendingr the metal of the cage ai. the extreme ends thereof.

Signed by me at, Chicago, I11in0is,fths 24th `day of April, 195. v

' .LEE P.' HYNE'S.

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