US1103411A - Fuse-plug. - Google Patents

Description

J. H. HANSON & J. W. STEELE. y

FUSE PLUG. APPLICATION riLnD APR. 12, 1913.

1,103,41 1, Patented July 14, 1914 tion, and the invention refers more particu- View o the core. Fig. 4 is a transverse secand -heing in contact with the lower lends of all of the fuses .8 or, in other -words, with the middle portions or bends oi specification.

through, each of said openings containing a ernten.

y JOHN H. HANSON ANB JOEL il?. STEELE, 0F CHICA/1GO, ILLINOIS.

FUSE-PLUG;

Specication of Letters Patent.

Patented July 14, 1914.

Application flied April 12, 191s. serial Nd. 760,650.

To all 'whom it may] concern:

Be it known that we, JOI-IN H. HANsoN and JoHN YV. STEELE, citizens of the United certain new and useful Improvements in Fuse-Plugs, of which the following is a The object of this invention is to produce a fuse plug of novel and improved construclarly to a plug provided with a plurality of fuses arranged to be successively brought into service, such plugs being known as multiple fuse plugs.

In the accompanying drawings, Figure 1 is a longitudinal vertical section'through a fuse plug embodying the features of our invention. .Fig 2 is a plan view with the closing ca removed. f Fig. 3 is a perspective tion through the plugin the plane of line 44 of Fig.` 1.

The referred form of our invention is shown in the drawings and will be herein described in detail, but it should be understood that the invention is not limited to the' exact structure disclosed, Ibut may be embodied in various modified forms without departing from the scope of the invention as defined 'in the appended claims.

The plug comprises a sleeve 5 of insulat ing 'material and a central insulating core 6 tting in said sleeve. Said core is provided with a plurality of openings or chainbers 7. extending longitudinally therefuse 8. In the preferred form shown in the drawings four. fuses lare provided, but it will be understood that the plug may be adapted fora larger or smaller number of fuses if desired. The fuses may be arranged in pairs, each pair being formed from an integral strip of fuse' wire, the middle portion of the strip being bent around the lower end of the wall between two of the fuse chambers 7. A metallic Contact button 10 has its shank secured in a central recess 11 in the core, the head ofsaid button fitting in a recess 12 in the lower end of the core the strips constituting said fuses. llhe free upper end of the strips which constitute the l'uses 8 are bentv outwardly to over-lie the upper end of the core, and the `extreme ends of the fuses preferably. are bent downwardly into recesses 13 in the outer surface of the core. Said fuses may, if desired, be secured o in said recesses by plaster of Paris or other suitable material. The lower end of the core has a head 14 formed thereon which underlies the lower end of the sleeve 5 when the parts are assembled together. The upper 5 end of the corehas a plurality of walls 15 extending upwardlyl therefrom, said walls forming partitionsl separating the upper ends of the openings 7 and the exposed ends of the fuses 8 from each other. When the 7o core is inserted intothe sleeve 5,A the upper ends of the walls 15 preferably lie substantially flush with the upper end of said sleeve.

A metallic shell 1G surrounds the sleeve 5, said shell being spirally indented to forni a screw thread to engage with the core 5 and Contact piece being soldered or otherwise secured to the shell 16, and the inner end of said piece being arranged to contact one of the fuses 8 as clearly indicated in Fig; 1. Thus only one of the fuses is in service at a time. The Contact piece 17 serves to secure g5 the shell 1G rigidly to the sleeve 5. If desired, interlockiirg iudentations 18 may be formed in said shell and sleeve at the side opposite to the contact piece 17 to further assist in locking these parts together. 9U

In order to more fully insulate the fuses:- from each other and prevent short circuiting between the fuses, we provide lugs 19 projecting inwardly from the sleeve 5, said lugs abutting against the partition walls l5 on g5 the core and (roinpietely closing the upper ends of the fuse chambers. The lug which lies above the contact piece 17 is provided at its inner end with an opening or notch 2S) for the purpose of ventingthe fuse chain ber beneath it, as will be latter described. Said lug forms a rigid backing for the conI tacty piece 17 and serves as an insulating cover therefor. l

The sleeve '5 has an enlargement or ex terior ange Q0 at its upper end. ik metalli;c cap 2l having a flange 22 at its edge fils downwardly over the flange 20, said cap being secured in place preferably by bending the lower edge of the flange 22 into an in annuiur groove 22) in the periphery ci the flange 20. 'lhe lmver corner ci' the limpie 20 serves as an insulating wall between the cap 21 and the shell 16. The cap 21 has a central opening 24 therein, and between Said cap and the upper face of the sleeve 5, flange phere through a -pair of grooves 27 in the edge of said `flange, one of the latter grooves preferably being positioned directly opposite the Contact piece 17. A groove'28 in the upper a'ce of the sleeve 5 connects the groovey 26 with the opening or notch 29 extending vertically through the lug 19 which liesl above the contact piece 17. The purpose of the grooves 26, 27 and -28 and the opening 29 is to permit the escape of gas -from the interior of the plug -when a -fuse is melted. f

In use, when the active fuse blowsf the plug will be unscrewed fromy its socket, the core 6 withdrawn downwardly out of the sleeve and given a partial rotation to bring a new fuse into place, and the core then again 'inserted into the ksleeve to carry the new fuse into Contact with the piece 17. W'hen all of the jfuses in the core have been destroyed, the oldcore may be thrown away and anew one rfull of Afresh fuses inserted into the sleeve. lVhen the lplug is screwed tightly into its socket, the pressure exerted on the contact button 10 will clamp the fuse 8 tightly between the u 'per end of the core and the Contact `piece 1i).

In the exemplary form of our vinvention which we vhave shown in the drawings, the

central core 6 is non-circular or polygonal in cross-section and the interior of the sleeve is correspondingly shaped to receive the core. lVhere four fuses are used, the core may be four-sided, as indicated most clearly in Fig. 3, the corners of the core preferably being beveled oil' as at 9. It should be understood,l however, that our invention -is not limited to a core which is non-circular in cross section. It is desirable -to form the core andthe sleeve in such a way that'they will interlock to prevent relative rotation thereof when the core and sleeve are in their normal or operative position. The non-circular shape of the core acts to prevent such relative rotation and the same -purpose is effected by Athe ugs 19 and the partition walls 15 which interlock when the core is in its operative position. Therefore, it will be seen thatwhen thelnterlocking parts 15 and 19 orftheir equivalents are used, the core need not necessarily be made non-circular, and on the otherhand when the core is made non-circular,`itis not necessary that the parts 15. and 19'be arranged to prevent relative rotation ofthe core and the sleeve. When the core is made non-circular, as shown in the drawings, it must be fully withdrawn from the sleeve before rotation to position the new fuse, but it will be readily understood that it' the interlocking relation bf the lugs 19 and walls 15 or their equivalent means, be depended upon to prevent relative rotation, the bod of the core might be made circular in which case it would be necessary to move the core longitudinally or axially merely a suiicient distance to disengage the interlocking . portions 15 and 19, when the core could be rot-ated within the sleeve. Thus it is not essential according to our invention that the core be fully withdrawable from the sleeve, out on the contrary a non-withdrawable core might be used, it being necessary only that the core have a longitudinal or axial movement in the sleeve a sufficient distance to disengage the interlocking portions of the sleeve and the core, so that they maybe relatively rotated vto position a new fuse.

'lWe believe ourselves to be the yfirst to produce a fuse plug comprising an inner and an outer part normally interlocked to prevent relative rotation and movable longitudinally or axially into position to permit of such relative rotary. movement.

It willbe noted that in our plug a new fuse may be substituted after a blow-out in an extremely short time and with very little trouble. No screws or like fastenings secure the fuses in place. It will also be seen that no spring contacts are employed, such springs being undesirable because 'likely -to vbecome overheated land untempered. All of the'fuses not .in use are carefully insulated from the active fuse to prevent accidental short circuits.

We cla'im as our invention:

1. A ,fuse plug comprising an outer member of insulating material, a threaded metallic shell secured thereto and adapted to be screwed'into a socket, an inner member, a plurality of fuses carried lby one of said members, and a contact piece carried by the other member and adapted to contact with one of said fuses, said members having portions engaging each other and prevent` ing relative rotation thereof when in their operative relation, and said members being relatively movable in a direction to disassociate said engaging portions.

2. A fuse plug comprising an outer member of insulating material, a metallic threaded shell secured thereto and adapted to be screwed into a socket, a contact terminal carried by said shell, an inner member. a plurality of fuses carried by said inner member and arranged to be successively brought into operative relation to said terminal by relative rotation ot' said members, Said members being ,shapedv to engage each other to prevent relative rotation when in their normal dinally movable with respect to each other messi;

into position to separate the engaging portions of' said members. l

3. In a fuse plug,y a body comprising a Sleeve-likeportion closed at one end, said body 'having a non-circular opening therein,

a central insulating core wholly inclosed eX- cept at one end by said body, said core having a portionfitting in said opening to prevent rotation of the core when in its operative position, and' a plurality of fuses carried by said core, the core being longitudinally movable to withdraw said portion from said opening, whereby the core is f'ree to be rotated to carry a new fuse into operative posit-ion.

4. A fuse plug comprising an outer bod7 portion of insulating material. having sccured thereto a threaded metallic shell adapted to be screwed into a socket. said shellhaving a contact portion. a central insulating core in said bodyr portion. said core and body portion having engaging parts to prevent relative rotation when in their operative relation, and a plurality ot' fuses carried by said core, said co're being arranged to have a movement longitudinall)7 ot its axis and also a rotation about its axis Ato succes zsively position said fuses in operative'relation to said contact portion.

5. ln a fuse plug, a body *comprising a sleeve-like portioii closed at one end, said body having a non-circular central opening. a Withdrawable core wholly inclosed except at one end b v said body, said core having a non-circular portion, said opening and said core-portion being shaped to permit insertion of' said portion in said opening in any one of several positions. said core having a plurality ot' loiigitudinal openings therein, a fuse in each ot' said openings, and a conf ductor carried by said bod)Y portion with which conductor one of said fuses is arranged to contact.

6. A fuse plug comprising an insulating sleeve, a metallic yshell surrounding said sleeve, an insulating core fitting into said sleeve and withdrawable therefrom, an enlarged head on the lower end of said core, said head extending laterally beneath the lower end of said shell and forming a finger piece by which the core may be Withdrawn, a fuse carried by said core, and a Contact piece extending through said sleeve, said contact piece contacting said metallic shell at itsouter end and being arranged to contact said fuse at its inner end.

7. In a fuse plug, a body comprising aI sleeve-like portion closed at one end, said body having an internal opening, an insulating core adapted to enter said opening, said opening and said core being wholly inclosed except'at ,one end by said body. said core being shaped to permit the insertion of the core in the opening in any one of several positions, said core and said body portion having parts engaging each other to prevent relative rotation when the core is in its operative position in said body portion, and a plurality yoiffuses carried by said core, said body portion having a conductor arranged to contact with one of said fuses at a time, when said core is placed in said body portion in different positions.

8. A fuse plug comprising an insulating sleeve, a metallic shell secured thereto, a core fitting in said sleeve, said core and sleeve having engaging portions which prevent relative rotation of' the sleeve and core when the latter is in its normal position, a plurality ofl fuses carried by said core, a contact piece connected with said shell and arranged to contact one of said iuses, and partitionv walls on one end ot' said core actingI to separate and insulate the upper end of the fuses from each other.

5). A tuse plug comprising an insulating sleeve, a metallic shell secured to said sleeve, an insulating cere extending into said shell and fitting in an opening in said sleeve, said core and said sleeve having engaging portions which prevent relative rotation of the core and sleeve when in their` operative relation. a plurality of fuses carried by said core, a conducting portion#connected with said shell and arranged to contact one of said fuses, partit-ion walls on one end of said core arranged to separate said fuses from each other, lsaid partition walls and said sleeve forming recesses, and inwardly projecting lugs on said sleeve arranged to close the upper ends of said recesses.

l0. A :t'use plug comprising an insulating sleeve. an annular threaded metallic shell secured thereto and adapted to be screwed into a socket, an insulating core polygonal in cross section extending into said shell and fitting in a corresponding central opening in said sleeve to prevent relative rotation ot the core and sleeve when in normal relation, said core being withdrawable longitudinally from'said central opening to permit such relative rotation, a contact-piece connected to said shell, and a. plurality of fuses. carried by said core and arranged to singly contact said contact-piece when the core is in different positions.

11. `A fuse plug comprising an insulating sleeve, an annular`threaded metallic shell secured thereto and adapted to be screwed intoa socket, a central insulating core, said sleeve and said core having interengaging parts which prevent relative rotation of the sleeve and core when in their operative 'relation. said core being movable longitudinally to separate said engaging parts and permit such relative rotation, a -cap fixed to and closing the end of said sleeve opposite to that from which said core enters, a plurality of fuses carried by saidcore and arranged to singly contact at their upper ends with a part connected to said shell when the core is in different positions, and a contact button ixedin the end of the core opposite to said capand Abeing exposed on the surface soas'to'contact with a portion of the socket, the-,lower ends of all of said fuses being in contact with said button.

12. A fuse plug comprising a body, a core having a plurality of "fuses, portions of which are exposed on the outer surface of the core, said core having partition walls separating said exposed portions from each other, and said body having inwardly extending lugs cooperating with said partition walls to further insulate such exposed portions.

13. A fuse plug comprising a body ortion, a core therein having a plurality o recesses, fuses in said recesses, and lugs onl the body portion projecting inwardl and lying in' said recesses to prevent rela-tive rotation of the body and the core, the latter being axially movable to disengage vthe recesses' and the lugs and permit rotationof the core.

In testimony whereof we affix our signatures in the presence of two witnesses.

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