US1450029A - Inclosed electric fuse - Google Patents

Description

A. L. EUSTICE INULOSED ELECTR IC FUSE Filed June Zl, 1918 2 sheetssheet 1 Mar. 27.; 1923-,

L. EUSTiC E IN Lu ED ELECTRIC FUSE 2 sheets-sheet '2 Filed June 21, 1918 pasta Mar. 27, 1923.

UNITED STATES PATENT OFFICE.

ALFRED L. EUSTICE, OF CHICAGO, ILLINOIS.

INCLOSEI) nrncrarq FUSE.

App1ication filed June a1, 1918. Serial No. 241,115.

EUSTICE,

for holding a terminal in place, and has forits object to provide a combined gas-check and terminal-lock end-closure that will 1 facilitaterepeated removal and replacing of the parts in proper relations one to 'the others, and thereby adapt the fuse who used as a. renewable fuse.

The several features of the invention may be realized in a number of different con-- 'structions differing among themselves in details, some of which are illustrated in the accompanying drawings, in which- F ig, 1 is :an external view of a complete fusewith one of the two similarly construct-' ed ends in section, and showing one embodiment of the several features ofthe invention,

Fig. 2 is an axial section of one end of the fuse, the shell with its tubular attaching head. as preferably employedin all embodiments of the invention,

tive; I

Fig. 3 isa perspective view of. the combined gas check and terminal-lock employed in Fig. 1; i i

Fig. 4 is a detailed view minal employed in Fig. 1;

Fig. 5 shows a modified form of locking 'disk;.

Fig. 6 is a detailed view of the ferrule, preferably employed in all of the forms;

Figs. 7 and 7" show by opposite perspective views a modified construction of gascheck or looking disk; r

F'gs. 8 and 8 show by two longitudinal sections a further modification of'the con-- struction and assembly of terminal blade and disk; f

Fig 9 is a perspective view showing a further modification of the'combined' gascheck and terminal-lock;

residing at a seat and centering'guide 2 shown in perspecof the blade .ter

Fig.'l0 shows the terminal preferably employed with thedisk of Fig. 9;

Figs. 11, 11 and 11 show, by plan and two edge views, a further modification of the combined gas-check and terminal-lock;

Figs. 12 and 12 are views of a modified form of terminal and a sealing washer ad-aptedto'"be counter-sunk into the outer shoulder thereof, and which may be em-' ployed. in connection with the sealing and locking device of Figs. 11 and 11 and Fig. 13 shows in section, and Figure 13 shows in edge elevation the devices of Figs. 11 to 12 assembled.

One'object of the present invention is to adapt a tubular shell made of suitable insulating material, such as indurated fiber, to receive the gas-check and terminal-lock endclosure, and to serveindefinitely in connection therewith, as a housing for renewable fuses, to which end a tubular body 1, of insulating material, is provided with a tubular head 2 of-metal, formed with a reduced portion 2 screw-threaded into the body and forming a bushing therein to resist shrinkage, and with a larger portion 2' affording for any of the end-closures disclosed herein;- the portions 2* and 2* being offset by a shoulder 2 which adapts the head to abut against the body 1. Notches 2 receive corresponding portions of the end-closure to interlock therewith and prevent rotation of the end-closure and the'terminal blade upon the head, and the external threads 2 upon the enlargedportion 2 of the head providefor removable attachment of the ferrule 5, which is to confine theend-closure and theparts which it controls.

The end-closure 3 may take any one of a numberof forms, several of which are illustrated. herein.- the object is to. provide a convenient means. for embracing and detachably interlocking with the terminal 4, and through which the terminal may be centered upon and firmly anchored to the shell 1, and which, notwithstanding these functions, will aiford a substantially impervious wall over the end of In connection with each,

and terminal lock have, as their principal characteristics, a dlsk 3, separable or opening up at the terminal into a pair of complementary members 3 and 3 recessed to receive the terminal between them, conforming to apertures, shoulders, or other reduced portions of the terminal in a manner tointerlock with the terminal and pre-- vent both rotation and longitudinal movement thereof, said disk fitting snugly upon the terminal in a manner to check the passage of gas between the terminal and disk,

so seated upon the head Qand held 'tothe notches 2 thereof as to prevent rotation of the disk upon the head, and also affording 'a continuous end wall for the housing, and

presenting a continuous outer surface to the wall of the ferrule 5 which presses against it so that-the gas developed in the blowing nations thereof, as pointed out in the subjoined claims. The claims, therefore, should be looked to ,to ascertain the scope of the invention as well as the novel details of construction embraced within 'it.

Referring more particularly to the several disclosed embodiments of the invention.

The terminal if of all the figures has. the

shoulders 4- which are interlocked by the disk 3 in the direction to resist inward thrust of the terminal. In Figs. 4 and 10,

.the terminal is further provided with the P eye 4P that receives intermediate projections 3 on the members 3 and 3 of the disk, which projections meet within the eye and interlockwith the terminal in a manner to -'resist displacement thereof in both axial directions.

In Fig- 9 one of the projections 3 has half of its thickness continued to provide a bridging extension 3 from the member 3*, that underlies the member 3 and reaches the opposite wall of the shell, thereby in- .suring increased steadiness of the terminal support.

. In Fig. 4 the terminal is provided with a fixed flange 4 that underlies the disk 3 in a manner to confine the disk between the flange and the shoulders 1 and thereby afi'ord" increased bearing between the parts and provide an inner seal for the joints be-' According to Figs. 3 and 5, theends of the joint between the ' members 3 and 3 are lapped at 3 to assist in sealing the joint and to miter the parts together against displacement.

In Figs. 9 anclll, the members 3 3 are assembled by halving joints, Fig. 9 showing the end walls of the terminal recess provided with extensions 3 underlying the member 3", and of a thickness complementary to that of the latter so that the upper strata 'alone are complementary as to the area of the disk, and Figs. 11-11 showing each of the members, 3 3, provided with half laps 3 upon the other at the. ends of the' terminal recess.

Again, the members 3?, 3", may bewhollyi separable, as shown in Fig. 5, and the surrounding ferrule alone relied upon to hold them together around the terminal; or connected together by hinges 3, as shown in Figs. 7, 7, Fig. 9, and Figs; 1111"; or limited in their separation by slot and pin .connections 3 as shown in Fig. 3. And in so connecting the members of the disk, they may be hinged directly, oneto the other, as suggested in Figs. 9 and 11, or through the medium of-a base member 6, Figs. 7, 7, essentially in the form of'a ring having an nlargement 6 providing a gate to receive the wider portion of the terminal in assembling and with a reduced opening 6* confining the terminal edgewise while the mem-. bers 3 3, closed upon the blade, confine it laterally; or the connection of the members 3 3 may be through the medium of a base member 7 in the form of an outer sealing washer, as shown iii-Fig. 3, upon whic-h are rovided one portion, for instance, the pins, of the slot and pin connections 3, and in which is ,formed a terminal opening '7 snugly fitting the larger dimensions of the terminal. lVasher or base member 7, being continuous, overlaps the joints between members 3' and 3* and checks the escape of gas therethrough. It also presents a smooth outer-surface to receive the confining flange ofthe ferrule,-and better enables the ferrule to pack theend-closure.

The inner sealing flange 4 and outer seal ing'washer 7 will ordinarily be employed only for'larger' capacity fuses, and to still further safeguard against leakage, a soft packing member 8, of leather or other material equivalent for the purpose, may be interposed between the disk members 3, 3",

and the base -membe r- 7.

It is not necessary in all instances the inner flange on the terminal or the eye therein. As suggested in Figs. :8 and 8*- longitudinal interlocking in the outward direction maybe insured by fitting the disk 3 into a groove 4 in one or more faces of the terminal; or, as suggested in Figs. 12 and 13, additional shoulders 4 may 'be-suitably to have Y in F igures Sand 8 is also suitable for use in Figures 7' and 7. f

As further suggested in Figs. 12 and 12,

in connection with the form of disk shown an upper sealing and sustaining'washer 9- may be employed with an opening 9 'suificient topass the shoulders 4 as by tipping the washer over them successively, and this washer may be embedded in the under faces of the upper shoulders 45, and. thus avoid the necessity of extending the upperwasher out to the engaging wall of the ferrule. In

all cases, lugs 10 are preferably located on the disk t enter'th'e recesses 2 and hold the disk. and its associated parts from turning on the shell.

The ferrule 5, ineach instance, is preferably wall 5 through which it clamps the disk and its associated parts upon the end of the shell; also withinternalthreads 5 through Which'it engages the external threads of the shell (provided by the tubular head). But

the ferrule does not. terminate with its threaded portion 5 but extends beyond the same in a lip or apron -5 that provides a battle for the gases and nsures their direcf tion along the wall of the shell instead of outward. The device end discharge of'gases.

The probable course of the gases of blowing is through notches 2 to the thread spaces of the ferrule and thence through the circuitous passage'so provided to the space beneath the baflie or apron of the ferrule.

What I claim is:

1. In an electric fuse having a shell and a link-supporting terminal; a combined gascheck and terminal-lock end-closure therefor, comprising a ferrule and a disk surrounding the terminal and clamped between effectually prevents a wall of the ferrule and the end'of the shell; said disk comprising a pair of separable complementary members meeting at the terminal, interlocking with the terminal I to resist relative rotary and longitudinal movement thereof, andconstructed to provide a continuous end wall for the shell and a continuous surface through which the disk receives the clamping wall of the ferrule, whereby it confines the escape of gas mainly to the spaces within" the disk and ferrule. 0

'2. In an electric fuse having a shell and v a link-supporting terminal; a combined gas-check and terminal-lock end-closure therefor, comprising a ferrule and a disk surrounding the terminal and clamped be tween 21 wall of the ferrule and the end of the shell; said disk comprising a-pair of separable complementary members meeting provlded with an nternal engaging tive movement between them; said disk being constructed to provide a continuous end wall for the shell and a continuous-surface through it receives the clamping wall of the ferrule whereby it confines the escape of gas mainly to the spaces within 'the disk and ferrule. v

3. In an electric fuse having a shell and a link-supporting terminal; a combined gascheck and terminal-lock end-closure therefor, comprisingv a ferrule and a disk surrounding the trminal clamped between a wall of the ferrule and the end of the shell; said disk comprising a pair of separable complementary members meeting at the terminal, having lug and notch interlock with the shell to resist its rotation thereon, and vent the fuse through the wall of the shell within the ferrule, andsaid terminal having an interlock with the disk to resist both rotary and longitudinal relative movement between them; and said disk being constructed to provide a continuous end wall for the shell and a continuous surface through which it receives the clamping wall of the ferrule whereby it confines the escape of gas mainly to the spaces within the disk and ferrule.

- 4. In 'an electric fuse having a shell and a link-supporting terminal, a combined gascheck and terminal-lock end-closure therefor, comprising a fergule and a. disk surrounding the terminal and clamped between a wall of the ferrule and the end of the shell; said disk comprising a. pair of separable complementary members meeting at the terminal, and said terminal'having a reduced and shouldered portion through which it receives the members of the disk and provides an interlock therewith to resist both rotary and longitudinal relative movement; and said disk being constructed to provide a continuous end wall for the shell and a continuous surface through which it receives the clamping wallof the ferrule whereby it confines the escape of gas mainly to the spaces within the diskand ferrule.

5. In an electric fuse having shell and link-supportingterminal; a combined gas:

check and'termin'al-lock end-closure therefor, comprising a ferrule anda disk surrpunding the terminal and clamped between a wall of the ferrule and the end of the shell; siaid disk comprising'a pair of separable con'lplementary members meeting the terminal, and said terminal having a reduced and shouldered portion through which it re ceives the 'members of the disk and provides an interlock therewith to resist both rotary and longitudinal relative movement, the

shoulders of the terminal over-lying and, I

sealing the meeting faces of the disk memhers; and said disk being constructed to provide a continuous end wall for the shell and a continuous surface through which it receives the clamping wall of the ferrule whereby it confines the escape of gas mainly to the spaces within the disk and ferrule.

6. In an electric fuse having a shell and a link-supporting terminal; a combined gascheck and terminal-lock endclosure therefor, comprising a ferrule and a disk surrounding the terminal and clampedbetween a wall of the ferrule and the end of the shell: said disk comprising a pair of separable complementary members meeting at the terminal,- and said terminal having a reduced and shouldered portion through which it receives'the members of the disk and provides an interlock therewith to resist both rotary and longitudinal relative movement. the shoulders of the terminal over-lying and sealing the meeting faces of the disk members; a sealing washer being fitted snugly around the terminal on oneside of the disk and overlying and sealing that portion of the meeting faces of the disk members which extend. beyond the terminal; said disk being constructed to provide a continuous end wall for the shell and a continuous surface through which it receives the clamping wall of the ferrule whereby it' confines the escape of gas mainly to the spaces within the disk and ferrule. v

T. In an electric fuse having a shell and a linlesupporting terminal; combined gascheck and terminal-lock end-closure therefor, comprising a ferrule and a disk surrounding the terminal clamped between a all of the ferrule and the endof the shell; said disk comprising a base membe and a pair of complementary members movably mounted upon said base member and meeting at and interlocking with the terminal to resist relative rotary and longitudinal movement thereof; and said disk being construct cd to provide a continuous end wall for the shell and a continuous surface through which it receives the clamping wall of the ferrule whereby it confines the escape of gas mainly to the spaces within the disk and ferrule.

8. An end-closure for inclosedfuses. having blade terminals. comprising a base menibcr constructed with an opening to admit the terminal end-wise. and a divided locking disk having its members separable to admit the terminal between tlltll1; \t,lll(l having projecti'ons for entering recesses of the terminal to interlock he end-closure thercwithi the members of the disk having slot and pin connections with the base member whereby they are permanently mounted the eon.

9. In an electric fuse ha ing a shell and a link-supporting terminal: a terminal-lock. comprising a disk composedof a pair of separable complementary members meeting at the terminal. interlocking with the terminal to resist relative movement thereof, anda circular shoulder secured to the terminal underneath the terminal lock, and substantially fitting the bore of the shell, .and thereby serving as a bulk-head for finely-divided filling material while the latter is being in serted. I

10. A combined end-closure and terminal lock for inclosed fuses. comprising a base memberhaving permanently mounted thereon a disk divided into relatively movable parts meeting adjacent the terminal, recessed to permit them to receive and close upon the terminal. and having connections with the base member which guide them'into proper meeting relation and leave the meeting portions of the disk beyond the edges ofthe terminal'lapped by the base member.

11. In an electric fuse having a shell \and a terminal. a disk for positioning the terminal upon the shell, comprising a plurality of complementary parts permanently connected together but relatively movable transversely to the longitudinal axis of the terminal for interlocking the disk with and disengaging it from the terminal; 12. In a fuse having a shell and a blade terminal, a disk for positioning the terminal upon the shell comprising a base member and a locking member permanently connect ed with and carried by said base member and 'movable thereon intoand out of engagement with the terminal to prevent-separation of the base member therefrom.

13. In a fuse having a shell and a blade terminal. a disk for positioning the terminal upon the shell comprising a base member and a locking member permanently connected with and carried by said base member and movable thereon into and'out of engagement with the terminal to prevent separation of the base member therefrom; said base member surrounding the terminal. and being ass mbled therewith by longitudinal movement relatively thereto.

14. In a fuse having 'a shell and a blade terminal. a disk for positioning the terminal on the shell comprising a base member assembled with the shell by movement longitudinally thereof, and a pair of complementziry disk members permanently connected witl: and carried by said base member and movable thereon transversely of the longitudinal axis of the-terminal to interlock and r lease the latter.

15. In a fuse having a shell and a blade te minal. a disk for positioning the terminal onthe shell comprising a base member assembled with the shell byymovement' longitudinally thereof. and a pair of complemcn tary disk members permanently connected :with and carried by said base member and movable. thereon transversely of the longitudinal axis of the terminal to interlock and release the latter; the opposed edges of 10 shell; said disk comprising a pair of separable complementary members meeting at the terminal, interlocking with the terminal to resist relative rotary and longitudinal movement thereof, and an enlarged shoulder fixed-t0 the terminal on the under side of 15 the end-closure, and faces of the disk.

Signed at Chicago, of June, 1918.

sealing the meeting Illinois, this 17th day ALFRED L. EUSTICE.

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