US1310182A - Planoqbaph co - Google Patents

Description

C. L. EIDLITZ.

FUSE PLUG.

APPLICATION FILED APR. 9. ms.

Patented July 15, 1919.

INVE NTOR.

W I TNESS:

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CHARLES L. EIDLITZ, OF NEW YORK, N. Y.

FUSE-PLUG.

Specification of Letters Patent.

Patented July 15, 1919.

Application filed April 9, 1918. Serial No. 227,422.

To all whom it may concern:

Be it known that 1, CHARLES L. EIDLI'rz, a citizen of the United States, residing at the city of New York, in the borough of Manhattan and State of New York, have invented certain new and useful Improvements in Fuse-Plugs, of which the following is a full, clear, and exact description.

This invention relates to the electrical device known as a fuse plug. A fuse plug ordinarily consists of an insulating body having two external contacts and provided with an interior chamber containin a fusible conductor, the terminals of w ich are in connection with said external contacts, the device being adapted to be screwed or otherwise fitted into a socket containing two con tacts of an electric circuit, which are thereby brought. into connection with the said external contacts of the plug so as to introduce the fusible conductor into the circuit. As these plugs have been commercially manufactured, the fusible conductor is perma nently secured by solder or some equivalent means to the contacts of the plug and with as great a space as possible between the extremities of the fusible conductor, so that when the fuse is blown it will be impossible for an arc to form between the contacts of the plug. As thus constructed, it is impractical to replace a destroyed fuse and the practice has been. therefore, to discard the plug as a whole, and introduce an entirely new plug whenever a fuse is blown. To avoid this waste it is the object of my invention to provide a plug in which the fusible conductor can be readily replaced, and to accomplish this in a structure which will prevent the formation of an are between the terminals when the fuse is blown and which may also be manufactured at low cost.

My invention consists of a fuse plug comprising an insulating body having the usual external contacts and provided with a cavity or chamber in which are located two binding posts connected respectively with said contacts and which are separated by a barrier or flange so arranged and combined with a cover for the cavity that it is impossible for an arc to form between the said binding posts. The barrier or flange at the same time imparts a U-shape to the cavity where in the binding posts occupy the respective legs of the U, and the fusible conductor connected with the posts extends along the bend of the U, thus affording an elongated chamber impossible to be traversed by any are between the posts.

The improved fuse plug is illustrated in the accompanying drawing, in which Figure 1 is a central section thereof, and

Fig. 2 a plan.

The plug consists essentially of a solid body of insulating material 1, formed at one end to receive externally the usual screw threaded sleeve 2 and central button 3 of an Edison base. At the opposite end of the body 1 is formed a circular cavity 4 concentric with the rear face of the body. This cavity is adapted to be closed by a cap 5 having a screw threaded flange adapted to screw over the outer periphery of the plug, as shown, and provided with a mica disk or window 6, which, when the cap is screwed in place, rests snugly against the annular edge of the plug and tightly closes the cavity. 7 is a fin or flange extending from the side wall of the cavity nearly across to the opposite side, but stopping short of the same at a point to leave a passage 8 between its extremity and the wall. This fin or flange rises from the bottom of the cavity 4.- and is provided with a straight outer edge, with which the mica disk 6 makes contact when the cap is in place to prevent communication between the two parts of the cavity on each side of the flange except around the end thereof, through the passage 8. The cavity is, therefore, by means of this fin, converted into a U-shaped chamber. In each leg of this U-shaped chamber is located a binding screw indicated by 9 and 10 respectively, the screw 9 being attached to a brass lug 10 leading through the insulating body 1, to the button contact 3 and the screw 10 being attached to a lug 12 leading to and connected with the threaded sleeve contact 2. Beneath each screw a pocket is formed in the insulation to accommodate the end of the screw. 13 is the fusible conductor, the extremities of which are clamped respectively under the heads of the screws 9 and 10 and the body portion of which leads through the passage 8. With this arrangement, it will be seen that the fusible conductor has considerable length and that when it is destroyed by an excessive current the fin 7 will act as a barrier to prevent the formation of an are between the two binding posts, communication between the two posts being abmlutely cut oil by the barrier and the mica disk of the cap in all directions except around the end of the barrier, the distance in this direction being too great to permit of the maintenance or formation of an are.

It is obvious that upon the destruction of a fuse a new one can readily be inselted by removing the cap and fastening the ends of the fuse under the respective screws 9 and 10, thus avoiding the necessity of supplying an entirely new plug.

I claim:

A f-use plug comprising an insulating body having a cavity in one face, an insulating fin projecting from the bottom of Said cavity and transversely from one side Wall thereof, a cover for said cavity comprising a mica disk resting against the outer edge of the fin, two electrical terminals located in the cavity on opposite sides of the fin, and a fusible conductor detaehably conneeted with both of said terminals and leading therefrom around the free end of the fin.

n witness whereof, I subscribe my signatunei CHARLES L. EIDLITZ.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents, Wnhlngtou, D. 0."

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