US611243A - Safety-fuse for electric circuits - Google Patents

Description

Patented Sept-27, I898.

G. W. GARDANIER. SAFETY FUSE FOR ELECTRIC CIRCUITS.

(Application filed Dec. 16, 1897.)

(No Model.)

INVENTOR ATTOR EY GEORGE VV. GARDANIER, OF NYAOK, NEW? YORK, ASSIGNOR OF THREE- .FOURTHS TO DAVID G. BLACK, OF LAKE HILL, NEV YORK, AND

THOMAS J. SMITH, OF ROSELLE, NEWV JERSEY.

SAFETY-FUSE FOR ELECTRIC CIRCUITS.

SPECIFICATION forming part of Letters Patent No. 611,243, dated September 27, 1898.

Application filed December 16, 1897. $erial No. 662,153. (No model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE W. GARDANIER, a citizen of the United States, and a resident of Nyack, in the county of Rockland and State of New York, have invented certain new and useful Improvements in Safety-Fuses for Electric Circuits, of which the following is a specification.

The invention relates to improvements in safety-fuses for electric circuits; and it con sists in the novel featuresof construction and combinations of parts hereinafter described, and more particularly pointed out in the claims.

The object of my invention is to produce a more convenient and efficient combined fuse and fuse-holder than those heretofore known to me and one which may be readily applied to the supporting panel or board and conveniently moved therefrom either to break the electric circuit or permit of the examination or reapplication of the fuse.

The invention will be readily understood from the following description, reference being had to the accompanying drawings, in which Figure 1 is a central Vertical longitudinal section of the fuse and its holder interposed in the electric circuit. Fig. 2 is a bottom view of the upper or removable portion of the holder carrying the fuse. Fig. 3 is a top View of the lower portion of the fuse-holder, and in this figure the dotted line 1 1 indicates the section on which Fig. 1 is taken; and Fig. a is a vertical transverse section of the fuseholder on the dotted line 4: 4 of Fig. 1.

In the drawings, A designates the lower portion of the fuse-holder, and B the upper portion or removable part thereof.

The lower portion A of the fuse-holder is adapted to be secured to the board, panel, or other support by means of the screws indicated at a a in Fig. 1, and said portion A is of elongated form, as illustrated in Fig. 3, its middle portions being elevated above the supporting board or panel bymeans of the down wardly-projecting ends 0 O, which form supporting-feet for the said portion A. The opposite sides of the portionA are lettered D D, and said sides extend upward and form between them a chamber E, which incloses the fuse and the parts connected therewith, as indicated more clearly in Figs. 1 and at. The lower portion A of the fuse-holder is formed with the vertical apertures E E, which receive the metallic sleeves F F, the latter receiving the plugs G and having the lateral extensions H, to which by the usual means illustrated the main conducting-wires I are connected.

The lateral extensions 11, connected with the metallic sleeves F, are apertured to receive the screws 1, and these screws 1 receive the nuts J, washers K, and the ends of the main conducting-wires I.

The upper portion- 13 of the fuse-holder is in the form of an elongated block adapted to fit upon the sides D D of the lower portion A and having its upper portion in the shape of a handle L, which permits of the convenient withdrawal of the portion B from and its application to the portion A. The upper portion B of the fuse-holder has secured to the lower side of its opposite ends by means of the screws M the plugs G, the upper portions of which are solid to receive the screws M and the lower portions of which are circular in cross-section and hollow and composed of the arc-shaped spring-fingers adapted to fit snugly within the metallic sleeves F, carried by the lower portion A of the holder. The plugs G are given the form and construction illustrated, particularly at their lower ends, in order that they may always firmly bind against the inner walls of the metallic sleeves F and form an electrical connection with said sleeves. The fuse is secured at its ends to the small removable plates 1), and these plates are by means of screws, as seen in Figs. 1 and 2, fastened to the sides of the plugs G. The fuse comprises the wires d e, the wire d being preferably a piece of insulated German-silver wire, while the wire 6 is made of soft alloy. The wire (Z is a resistance-wire, and its end is first attached to the end of the wire (2, and then said wire cl is wrapped around the wire 6 to form the heating-coil f.

XVhen the upper and lower portions A B are brought together in their operative position, as shown in Fig. 1, the plugs G will at their lower ends enter the metallic sleeves I and the fuse will be inclosed within the space E, formed between the sides D D of the portion A and below the lower surface of the upper portion 13, the said fuse and its heat ing-coil f being thus securely protected, but at the same time being capable of removal by the withdrawal of the upper portion B from the lower portion A. When the parts are in the position illustrated in Fig. 1, the fuse, composed of the wires cl 6, is, by means of the plugs G, metallic sleeves F F, and plate eX- tensions H, brought within the main electric circuit. Upon an undue current passing over the main conductors I I the coil f will become heated, owing to the resistance offered by it, and will burn the wire 6, thus breaking the circuit and affording the desired protection. Upon any burning out of the fuse the upper portion B will be withdrawn from the lower portion A and a new fuse will be applied to the plugs G G. The withdrawal of the upper portion B from the lower portion A of the holder removes the plugs G from the metallic sleeves F and breaks the circuit.

The lower and upper portions A B of the holder will preferably be formed of porcelain, and the upper portion B will, adjacent to its ends, be provided with the recesses h of sufficient size to receive the screws M and the means for fastening said screws into the plugs G. The recesses 7t, after the screws M have been applied, will be filled with plaster-ofparis or like material, which will effectually conceal and protect the heads of the screws M. The lower surfaces of the upper portion B, in line with said recesses h, are formed with recesses t' to receive the upper polygonal ends of the plugs G, and said recesses t' prevent the turning of said plugs at any time and particularly during the application of the screws M.

It will be seen upon reference to Fig. 1 that the plugs G, fuse-wires d 6, nuts J, and screws I are wholly inclosed within the space E, formed between the upper and lower portions A B.

The fuse and holder have been devised with the purpose of securing entire convenience and efficiency in use and ease of manipulation and manufacture.

That I claim as my invention, and desire to secure by Letters Patent, is

1. The fuse-holder comprising the upper and lower portions, one being removable from the other and said portions forming between them the inclosed chamber or space, combined with the fuse-supports carried by said removable portion and being in electrical con nection with the main conductors, and the fuse connected with said supports and being within said inclosed space and comprising the wires cl,e,in electrical connection with one another, the end of the wire (Z being attached to and wound around the end of the wire 6 to form a heat-coil f; substantially as and for the purposes set forth.

2. The fuse-holder comprising the portions form in g an inclosed space between them, combined with the fuse in said space, and means connecting said fuse in the electric circuit, said fuse comprising the insulated resistancewire (I and soft wire 6 connected with one another, and the wire at forming the heat-coilf around said wire 6; substantially as and for the purposes set forth.

3. The fuse-holder comprising the lower portion A of elongated form and having the sides D, D and apertures E, and the upper portion B having the handle L, and recesses h, t, and adapted to said lower portion A, combined with the metallic sleeves F fitting said apertures E and having the lateral'extensions H included in the electric circuit, the plugs G fitting said recesses t'at theirupper ends, the screws M entering said recesses h and securing said plugs, and the fuse removably connected to said plugs, the lower ends of said plugs being formed of the springfingers snugly fitting said metallic sleeves, and said recesses 7t being filled above the screw-heads therein with plaster-of-paris or othersuitable non-conductin g material; substantially as set forth.

Signed at New York, in the county of New York and State of New York, this 15th day of December, A. D. 1897.

GEORGE \V. GARDAN IER.

\Vit-nesses:

CHAs. G. GILL, E. .Ios. BELKNAP.

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