US1529484A - Dead front safety panel - Google Patents

Description

March 10. 1925. 1,529,484

G. w. HYSER DEAD FRONTQAFETY PANEL 0 v Filed Jan. 5, 1921 2 Sheets-Sheet 1 fm/erzzor 6,6075% VJ 133 5 67' 9 M 7125 Af Q N LANG Liv (OI I T M 1 fi F m March 10. 1925. v

G. w. HYSER V DEAD FRONT SAFETY PANEL;

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Patented Mar. 10, 1925.

UNITED STATES GEORGE W-. OF MINNEAPOLIS; MINNESOTA.

.nnnn mom sarmy PANEL Application filed Janus-r13, 1 921.

citizen of the United States, resident'ot Minneapolis, county of Hennepin, State of Minnesota, have invented certain new anduseful Improvements 1n Dead Front Safety-f- Panels, o't which the following is aispecification.

My invention relateslto cabinets wherein circuit switches, fuse cups and other electric connections are mounted and the object of the invention is to provide a COIlStlllCtlOIl:

A further object is to eliminate the use .of'

fuse cups and switches of special construction and also the polishing and finishing of all bus and branch bars;

A further and particular object isto provide a construction which will make it possible to remove either fuse cup or switch. from the panel without disturbing any of..- the steel plates, bus bars, or any other partv of the equipment, and, further, .to provide a panel of simple inexpensive construction and one which can not be derangedor inad? vertently damaged by a person unfamiliar with devices of thiskind.

The invention consists generally in various constructionsand combinationsaall as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification,

Figure l is a front elevation of a portion of a cabinet with my invention embodied therein;

Figure 2 is a horizontal sectional view on the line 2-2 of Figure 1.

Figure 3 is a rear view of the panel removed from the cabinet to show the bus bar connection thereon;

Figure 4 is a cross sectional view on the line 44: of Figure 3;

Figure 5 is a similar view on the line 55 of Figure 3.

In the drawings, 2 represents the rear wall of the cabinet and 3 the side walls formed preferably by folding outwardly the edges Serial in. 434,547.

ofa-the sheet steel plate of which the rear wall 2is composed and 4 is the front of the cabinet, secured by suitable means to the inwardly-turned flanged edges 5 of the side walls. In this style of cabinet front I provide-a single door Gthrough which access is had'to the interior of the cabinet and the mechanism contained therein. When switches are employed in the circuit two doors will beprovidedlin the front of the cabinet. arrangement of doors, however,-isrnot novel, and I make no claim to such construction herein. 7 represents the sheet offinsulrating material which I prefer to place against the rear wall of the cabinet andinthe rear of the bus bars and other, apparatus which will presentlybe described in detail. 8 is a yoke having end portions 9 securedto the rear wall of the cabinet by suitable means, such as screws 10 and on this yoke the insulating plateor element 11, preferably of slate, usuallylused in cabinets of this kind, is mounted; A space 12 is provided between the plate 11 and the rear wall of the cabinet and in this space I arrange the potential bus bars 13 separated by air gaps from the walls of the cabinet and from the yoke 8. The neutral bus bar 13 is arranged between the other' bars and seated on a branch bar 1'3 which connects the opposite fuse cups and is preferably seated on the back of the insulatingcelement. Ordinarily these bus bars arearranged infront of the plate whereon' the fuse on s are mounted and-aste'el plate is arrangec in front of the bus bars. Such construction is objectionable, as itincreases the expense of the device, the steel plate, while normally dead, is-liable to become charged from one of the switches in the rear of the plate so that an operator or attendant may receive a severe shock while working around the cabinet. By locating the bus bars in the rear of the plate 11 where they cannot be seen, or reached by the ordinary observer or attendant, I eliminate all danger of charging any of the conductors with which the hands of an attendant may come in contact and furthermore, the bus bars are not particularly ornamental and the appearance of the cabinet is greatly enhanced by concealing them in the rear of the insulating plate of slate 11.

The outer bus bars 13 are secured to the backfof the plate 11 by means of suitable screws 14, and are preferably spaced therefrom by suitable spacing collars 14: asshown in Figure 4. These two bus bars are e'lec trically' connected to the fuse cups 16 (of cups l6 by means of the branch bars 13" and screws in as shown in Fig. 5. A connecting screw 15 is also provided in each fuse cup, and these screws have their lower ends suitably secured to a series of connect-' ing bars 17 which have their outer ends in electrical connection with the binding posts 18. In 'F 1g. 3, there is shown a panel having four branch circuits, each circuit comprising in the cups-16 and 16 of a circuit, such circuit Wlll be closed between the bus bars and of panel and el tends outwardly from the plate 11 to a point near the front wall of the cabinet and prevents theattendant from inserting his hand into the space between the plate 11 and the front of the cabinet and coming in contact with the terminals 18 or with any other charged part of the apparatus. When switches are employed in the circuits the insulating wall incloses the switches only.

In various ways the details of construetion herein shown and. described maybe modified and still be within the scope of my invention, the essential feature of which consists in providing the insulating plate in frontof the bus and bars thereby protecting theperson working around the cabinet from injury. V T

I'claim as my invention:

1. The combination, with a cabinet, of an insulating plate mounted therein and spaced from the rear wall of the cabinet, bus bars arranged in the space betweensaid rear wall and said insulating platey fuse' cups mounted on the front of said insulating- The central bus bar 13 is electri plate and in circuit with said bus bars, termm'als for said bus bars mounted in the outer portions of said insulating plate, and insulating wall encircling said fuse cups and separating them from said terminals.

2.1'The combination, with a cabinet, of an insulating plate mounted therein, bus bars arranged in the rear of said insulating plate and normally concealed thereby, terminals,

for said bus bars mounted in said insulating plate, fuse cups mounted on the front of said.

insulating plate and in circu t with said bus. bars and a wall within said cablnet 1nterposed between said terminals and said fuse cups and closing the gap around sald cups 7 w a j and between them and said terminals. two fuse cups l6 and 16?. Thus, 1t w1ll' readily be seen that when fuse plugs are inserted 3. The combination with a cabinet having a front wall and a door opening therein and .ado'or therefor, of an insulating element mo'untedin said cabinet in the rear of said binding posts 18. A wall of either slate or steel 19 encircles the fuse cups in this-type,

door opening and opposite the same, bus

bars mounted in the rear of said insulatingelement, terminals therefor mounted on said insulating element, fuse cups mounted on .said insulating element and connected with hand reaching through said door opening from contacting with said terminals.

t. The combination, with a cabinet having a front wall and a door opening therein and doortherefor, of an insulating plate mounted in said-cabinet in the rear of said door opening and opposite the same, bus bars.

.mounted in the rear of said plate, terminals therefor mounted on said plate, fuse cups.

mounted on said plate and connected with V saidbus bars and a wall separating said ter- -m1-nals from sa d fuse cups and prqectmg outwardly from said plate to a point near said door opening and preventing access to said terminals through said opening.

Injwitness whereof, I have hereunto set my hand this 29" day of December, 1920.

' GEO. VV..HYSER..

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