US173681A - Improvement in electric fuses - Google Patents

Description

1m. SMITH. ELECTRIC-FUSE.

Patented Feb. 15,1876.

Engg a.

AIl.

H. Juntos-SMITH, ou Bo ummm/smentire Specification .forming p artoi ,Letters ,Patent No. 173.68m, dated F .February-3, 1876.

T0 alL/whom-itma/y concern:

.Be it Iknown that I, H. JULIU'S SMITH, of Besten, in the county ot' Suffolk and State of Massachusetts, have in vented certain nenT and nseful'f Impro\-'ements in-Electrieal Fuses, of .whichfth'e following is a specification :l Thisinvention` relates to certainjmprovef mentsin frietional .electric fuses,"it s;object be:` 'ing'.to'produce a fuse' of sulicien t ,.0011.11tivity tb carry the electric eurrenteasily through '.-the v charge, whereby all tendeneyL-ofthecurrent to leaye the-wires and takethfe'groundcirouit. Will-,be obyiated, and a current ot' suiiicientntensityjtransmitted .through the.ifus ,e} gto' ignite a chargeof -any kind of,explosiveorliihninate, an'Lfurtber, 'tof eheapen' theconstruction of ehe-ruse." 'by iii-e; eminnyment- :efnnteriorfiauu less' expensive eonilu'tils ne? @Nearly-.fillsnlated, wh 'cli tnexincreased' conductiyiity v of niyimproyement .enables me to employ.

My invention consists, trst,in the combina `tion','-witii the conducting-wires, betweentheir terinnalswithinthe fuse, ofasheet of .go1d,t silver, or other suitable foil, for the `purpose of conveying the current through the charge, ns hereinafter more fully set forth second, in` the combination, with the casing, of an insu` lating-b1ock of wood or other inateriahgrooveil or slotted on opposite sides, tormingrecesses for the reception ofthe conduetingwires, and a support for vthe foil which connects tneirter- -minals, .substantially ns hereinafter set forth; third, in the combination, with the casing and insulating-block, of an intermediate insulating-casing, to prevent contact between thev wires and casing, substantially as hereinafter described; fourth, in the combination, with the insulating-block, ot' the conducting-wires, bent or .crimped to prevcntthcir withdrawal from their recesses, or the turning or shifting offthe same. so as tol throw their ends oli' the connecting-sheet of foil, as incre fully hereinafter set forth; tit'th, in combination withI the. fuse and explosiveeomponnd, the conncct-ingsnoei, of foil and iron .condnoting-wires,.insulated with cotton or othercheap insulating niatexials, substantially as hereinafter described,

'ln the drawing; Figure 1 represents an elevation 'of my improved fuse; Fig. 2, a view siren, MAssAGHUsEfr-frs.

-ELEcTRlc Fuses.l V

ebruary 15, 1876; application filed partly in elevation and partly in section; Fig.

3 represents. an elevation and a. section of the insulating-block, and-Fig.` 4 represents a per- 'spectii'e Y`vieiviof;y thefjblock and conductingwirosf-ff .L y

filhedetterA'represents .,a'casingfoi'. metal or other '1 suitable. `material, provided .with 'a fshoulder aboutgnidway between 'its-two ends. l. The casing is'lpreferafblyvmadeof such diamefterand4 length that .an ordinary blasting-cap ivillI-t-nea'tly upon the 4forvirard endet' the .-Asame, 'the' extent to which it can be forceddown upon Csaid tube .being limited bythe shoulder tolprevent danger. The letter!) representsan insalatingfblock, fot wood or other; insulating material, A extending labout half-way. ,in 'to-l :the 'casing`,"'anlfrecessed or SlGtted'iong l udinnjlly on opposite .sides for Vthe receptionioi the coni dnoting-:i'rires l) l). Said conducting-vriresarc constructed, preferably, of.irony or'other'fcheap v'metalfaiid insulated by" meanso f= .cqtto1 r. or other inexpensive textile material, 'reinen .may '-fbe vcoated with any resinous v's'.il)s. i;;i,i.ce vto, iu-

crease its insulating properties and-'freuder it Waterfprootl The cond nctin g'- wires -are`,7'1'iret' era-bly,` bent orcriinpetl, as shown .in Eig. 3, to prcveirtfthe.shifting or turning. oif thesame in the recesses.` The-letter E represents the con;

necting-stri p or sheet of gold, silver',"orotl1er foil,l which' jiys ,cemented orotherwisesecured.- on the end of the insulating-block, the termi-' nals ot' lthefwires O'being bent-down over ,opposite edges of thesanle, in Fig. 4. 1n orderto .pre rent from passing. from thc Wires to th an intermediate insulating-casing, suitable material, isk interposed b two. The forward end ofthe casing A con- .'stitutes the charge-cham ber, and maybe lilled with an e casing,

closed.

The fuse, as thus constructed', offers] no resistanceto the passa rent, and therefore it is n the most iiertect conduct terialsfwhich are ex fuses too costly and, further,

ors and insulating' mafor many bythe actionot' thecnijrentupon as clearly .indicated vent 'the electric cury explosive or fulminate, alter which the open end' may be cemented or otherwise ittle or' ge ot the electriccurnnecessary to employ pensive, 'and render. the

ordinary prposes the foil, the charge is invariably fired, as the foil is heated and lvolatilized bythe passage of the,

curreni,=creating a. heat of sufficient int `ensit5r and duration to ignite the least-'sensitive ex-- plosives..- Bythis means I can construct the fuse with a single charge-chamber and. av'od the necessity. o f'exnpl'oying a series of cham- `bers for'l charges of different degrees of4 sensitiveness, asin the fuses heretofore constructed;

and, further, by dispensing with the extremely' sensitive end dangerous fulminates heretofcre' `found necessary, I- produce a fuse that isat-f tended with'nodanger whatever. f

What I claim, and desire to secure by Let-v ters Patent,' is'- 1. In combination with the conducting-Wires of effictional electric fuse, a connecting-sheet of gold, silver, orlothersnitable Foil interposed tial'lyas,descrihed. j 2. lIn -combineti'o'n with the casing A, the. insulatingfblock, grooved -cr y recessedl longibetween'the terminalsof said Wiles,4 substenvthe subscribing witnesses. t.

H. JULIUS SMITH,

tudilnall-y for lthereception .ot the connectingwires, and forming a support for the foil, substantially as described.

3; The combination of the casingffinternie- 'diete insulating-casing, and insulating-block, containing the wires and foil, snbstnntiallyas 4,' In conibination -with the recessed insulatin `1r-block, the. wires bent or crimped sshosvn, for the purpose described. i Y

15. In combination fwith.. the fuse containing the explosive compound,;the connecting sheet of fOiL-fand the iron conducting-wires, insulated l by means o f cotton or other cheap insulating material, substantially as described.

In testimony that. I claim' the foregoing I have hereunto set my hand`r in the presence'of Witnessem JAMES L. NoRRIs, Jos. L. Cocinas.

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