US924092A - Electric cut-off. - Google Patents

Description

T. E. MURRAY.

ELECTRIC GUT-OUT.

PLICATION FILED APR.l3,1908. 924,092, Patented June s, 1909.

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T. E. MURRAY.

ELEGTRIG CUT-OUT.

APPLICATION FILED Amma. 190e.

924,092. Patented m1684909.

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MURRAY, or NEW YORK, N.

i ELEcinrccUfr-OUT.

specification bf Letters' Patent.

.- .patented nm@ 8,1909.

Application :ned April 13, 190s. serial No; ritieni?' Be it known-that I, THOMAS E. MURRAY,-

a citizen of the United States, residing at New Yorkl and New York,1in the county of State of New York, have invented a certain new and useful Im rovement Electric CnteOuts, of whichtli i cation. A

y The invention relatesto electric cut-outsv or fuse-boxes, and consists-in the construction hereinafter set forth whereby a fuse plug (or plugslcombined with locking means prevents ,removal of the cover from .the base por.

tion of the device: also in the construction whereby, after said cover isin place, access is prevented to'theconnections until said loc ing means are'released and said plugs or plugs removed: also in the vvarious combinationsrecited in the claims.

In the accompanying drawings-Figure 1 is a top view ofniy improved cut-out with the cover in'place. Fig. 2 is a section 'on the line :v x otliig. 1. Fig. 3 is atop. view with the fuse plugs and cover removed. Fig'. 4 is an end view and Fig. 5 is -a detailed view? showinga locking bar and ring 32.

Similar numbers and letters of reference indicate like parts.

' sides thereof.

The device as here shown is constructedto receivethe main supply wires of a three wire systemand the terminals of two sets of house wires, connected to the mains on opposite The main wires are shown'at A, B, C; one set of house wires at D, E, F; and the other set of house Wires at G, I'I, I. The neutral wires are respectivelv B, E, H.

The b ase portion 1 is preferably a block of porcelain and has three transverse groovesv on its up er side to receive the main wires A, B, C, an four cylindrical openings, each provided With a threaded metal lining lor socket 2, 3, 4, 5.- Communicating with vthe cylin'- drical o Aenings and extending through the .end 'wal of the base are openings', 7, 8, 9,

on the bottom otwhich and of the cylindrical o eningsare contact plates 10, 11, 12, 13.

o these contact plates, 'by means of screws 14, aresecured the-ends of the wires D, F and G, I, and said contact platesa'lso electrically` QQHRCG' respectively with the sockets 2, 3, '4, 5, as shown at 15, Fie'.l 2, -In the bottomoi eachsocket is a headed screw 16, the shank of which extends 'down through a plate 17 of insulating material and an open-I ing lin the contact plate immediately-be and is received in a bar o metal'wbchlies e following is a specifi,-v

p tion 'of said wire A.v Thelbar 19 has a similar upwardly bent portion entering an opening inthe groove receiving the wire C and this wire` in like manner is connected to said bent portion of bar 19 by a lclip22. By this construction, the main wire A is connected through bar 18 to the headed screws 16 at Y the bottom ofsockets 2, 3, while the main wire C is .connected through bar 19 to the similar headed screws 16 at the bottom of sockets 4, 5. A third bar 23 lies in a groove on the under side lof the base, between thev grooves which receivebars 18 and 19,and

through 'an opening in said base to receive, a clip 24 similar to clips 21 and 22by which is secured to it' the neutral wire B. The ends ofthe bar 23 extend 'under openings 25 in the Vhasan elevated portion extending upward Btc end walls of the-base,- and have connected to them by screws 26,' Fig. the terminals of the neutralhousewires E and H; In each threaded socket 2, 8, 4, 5 is inserted a hollow cylindrical'use ',lugJ, K,

L, M, preferably made of porce ain. Said plugsare detachably engaged `to the base by means Vof a threaded. metal sleeve 27 on the exterior ofeach plug, constructed to enter the "threaded socket 2, etc.'v Extending through the bottom` of the plug is a contact plate 28. `vThe fusel 29 is connected4 at its lower end to the plate 28. and extends up,-

wardly and through an opening -inthe ofthe plug, its upper extremitybeing connected to the exteriorthreadedI sleeve. 27;v

When a plug is seated `in the base, the con# tact platev 28 meets the upper face ofthe headed screw 1 6 and in this way circuit is completed through the fuse. Thus, Aiii Fig; 2,1circuit proceeds frommainwire to bar 18,1'v to screws` 16 to contact plates 28, to fuses 29 in plugs J, Kj, to sleeves 27, to oontact plate 10 or 11 and so to house Wire F or In similar manner the housewires D and G are connected through the fuses in plugs L, M, to main wire C.

means for locking` the fuse plugs. in their Particular attention isv now directedy to the 35 manner is applied to plugs K and M.

thereof, is formed a shouldered ring 30, lserrated or indented around its upper edge; the, dovmwardly flanged cover 31 having operai ings in its flanges for the passage -of wires, and openings in its top forthe 1o plugs, is first put in place on the bas 1 Before one plug vJ M, of each pair is ins'f/{rted through the openings in the top of the,v "over, and so into its socket, it is passed thr/ough a flat ring 32 of metal having two upward projections 33 in each of which projections, is a vertical slot; so that ring 32 when the plug is finally seated, becomes clamped between the upper surface of the cover 31 and the shoulder of plug ring 30. A met-al bar 35 having a shouldered enlargement 36 at one end, is then inserted through the slots in the projections 33 until the shoulder of the en-` argement 36 bears against the side of one of said projections. The lower edge of said bar then lies in diametrically opposite indentations of the serrated top ofthe plug ring, and an end portion of said bar, preferably that nearest the said shoulder thereon, extends across the interval and enters an indentation in the top ring of the next adjacent plug.

Thus in Fig. 1 a bar 35 is seated in two indentations on top of plug J and extends across the interval and enters an indentation on to p of plug L; and another bar S/in like' In the opposite end of each bar 35, is an opening to receive the shackle of any suitable seal fastening 87, (one, only, shown in Fig. 1), which is to be constructed in any known way so that said shackle cannot be removed without destroying the seal, or otherwise leaving evidence of the fact of removal. It will be 'f obvious that by reason of this construction,

the fuse plugs cannot be rotated to withdraw.

l i5 them from their threaded sockets and so release the cover 31 because prevented by thelocking bars 35, and that no locking bar can be withdrawn longitudinally from the indentations on top of the fuse plugs, because prevented by its shouldered enlargement 36 and by the seal 37 As shown in Figs. 1 and 4, when the cover 31 is in place, it completely prevents access to any of the exposed wires or to any connections between them, so that there is`no Way offered for unauthorized persons to insert ground or other connections in order improperly to take off current. 'The shouldered fuse plugs lock the cover in place, the

ombars 35 lock/the fuse plugs, and the seals 37 base, a threaded. fuse plug received in said socket and ,passing through said cover and /ulder above and bearing on'said l having a/ cover, d a locking device positively engaging said plug for preventing rotation of said plug to remove the same from said socket.

2. In an electric eutomf a base, a cover therefor, a fuse plug seated in said base and passing through an opening in said .cover and aving a shoulder above and bearin on said cover, means on said fuse plug an in said base whereby on the rotation'of said plug in its seat, said lug is caused to engage with said base, and a locking device above said cover for preventing rotation of said plug to disengage the same from said base.

l3. In an electric out out, a base, a cover therefor, a fuse plug having an indentation on its upper surface, seated in said base and passing through an opening in said cover, means on said fuse plug and` in said base whereby on the rotation of said plug in its seat, said plug is' caused to engage with said base, a loc ing bar entering said indentation, a holder for said bar, and means on said cover for engaging a protruding end of said bar to prevent rotation of said plug to'disengage the same from said base.

4. In an elect-ric cut out, a base, a cover therefor, a cylindrical fuse plug having its upper end ring shaped and provided with a plurality of indentations, and the said plug being seated in said base and passing through an opening in said cover, means on said fuse vplug and in said base whereby, on the rotation of said plug in its seat, said lug is caused to engage with said base, a ocking bar lying in diametrically o posite indentations in said ring, a holder 'or said bar, and meanslon said cover for engaging a protruding en of said bar to prevent rotation of said plug to lisengage the same from said base.

5. In an electric cut out, a base, a cover therefor, a cylindrical fuse plug having its upper end ring-shaped and shouldered, and' provided with a plurality of indentations, and the /said plug being seated in said base and passing through an o ening in ysaid cover, means on said fuse p ug and in said base, whereby, on the rotation of said plug in its seat, said plug is caused to engage with said base, a ring interposed between said plug ring shoulder and said cover, upward projections on said ring having slots, a locking blar extendin through said slots and lying in diametrica y op osite indentations of said plug, means on said cover for engaging a protruding endof said bar to prevent rotation of said plug, and means. for preventing withdrawal of said bar longitudinally from 'said slots.

and passing through an opening in said cover, means on said fuse plug and in said base, whereby, on the rotation of said plug in its seat, said plug is caused to engage with said base, a ring interposed between said plug ring shoulder and said cover, upward projections on said ring having slots, a locking bar shouldered at one end to bear against one of said projections and extending through said slots and lying in dianietrically opposite indentations of said plug, means on said cover for engaging the end of said bar nearest to said shoulder thereon, and a seal fastening secured in an opening in the opposite end of said bar.

,7. In an electric cut out, a base of insulating material, circuit vconnections therein, a flanged cover of insulating material con-- structed to receive said base and to prevent access to said circuit connections, two fuse plugs seated in and engaging said base and passing through openings in said cover, and means above said cover and engaging with both of said fuse aluos for ,reventine re-y ti i3 moval from said base of said plugs and said cover.

S. In an electric out out, a base, a cover therefor, two fuse plugs seated in said base and passing respectively through openings in said cover, means on said fuse plugs and in said base, whereby on the rotation of said plugs in their seats, said plugs are caused to engage with said base, and a locking device connecting said plugstogether for preventing the rotation of said plugs to disengage the samefrom said base.

9. In an electric cut out, a base, a cover therefor, two fuse plugs seated in said base and passing respectively through openings in said cover, means on said fuse plugs and. in

said base, whereby on the rotation of said plugs in their seats, said plugs are caused to f l0. In an electric cut out, a base, a cover therefor, two fuse plugs having indentations in their upper suriaces, seated in sald base and passing respectively through openings in said cover, means on said fuse plugs and in said base, whereby on the rotation of said plugs in their seats, said plugs are caused to engage with said base, alocking bar entering said indentations and extending from plug to plug, a holder for said bar, and means for reventing removal oi said bar from said iiolder.

ll. ln an electric cut out, a base having an internally threadedsocket, a cylindrical eX- ternally threaded fuse plug entering said socket, and a locking device disposed outside et said base and positively engaging with said plug for preventing rotation of said plug to remove said plug from said socket.

12. ln an electric cut out, a base having a socket, a fuse plug entering said socket, means operable by the rotation of 'said plug to cause said plug to engage with said base, and. a locking device disposed outside of said base and positively engaging with said plug forpreventing rotation of said plug to remove said plug frolnsaid socket.

In testimony whereof l have affixed my dsignature in presence of two witnesses.

THOMAS E. MURRAY.

'Witnesses2 GERTRUDE T. PORTER, MAY T. MOGARRY.

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