US1542607A - Electric fuse - Google Patents

Description

June 16, 1925. 1,542,607

H. T. BUSSMANN ELECTRI C FUSE Original Filed May 7, 1919 Patented June 16, 1925.

UNITED STATES HENRY '1. BUS'SMANN, OF ST. LOUIS, MISSOURI. V

ELECTRIC FUSE.

Original application filed May 7, 1919, Serial No. 295,869. Divided and this application filed January 17, 1922. Serial No. 529,966.

To all whom it may concern:

Be it known that I, HENRY T. BUSSMANN, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain 45 new and useful Electric Fuse, of which the following is a. full, clear, and exact description, such as will enable others skilled in the art to make and use the same.

This application is a division of applicalo tion Serial N 0. 295,369 filed May 7, 1919.

My invention relates to electric fuse links and the object of m invention is to provide a fuse link that, Wlll operate satisfactorily under any conditions.

1.3 In the drawings Fig. 1 shows a view of my improved fuse link and Fig. 2 an elevational view thereof. Fig. 3 shows a detailed view.

My fuse link, as shown in the drawings,

20 is provided with terminal portions 4 of a much greater width than the center portion 6. By reason of the greater current carrying capacity and heat radiating surface of these wide terminal portions, the amount of 25 metal required at the center portion is reduced to a minimum. These wide portions are, at the oints adjacent to the center portion, entire y encased in insulating material, to act as an arc shield as shown at 5. When 3 the fuse blows and the center section melts, the are following cannot spread to the wide portions of the strip. In this manner, the amount of metal volatilized and the pressure developed as a result thereof, are held down to a minimum. a

To doubly safeguard against the continuance of the are, I prefer to provide apertures 7 in the wide portions of the strip. These. apertures are directly in line with the center portion of the strip, are of greater width 4 than said center portion, and are closed by the insulating material. As a result, the arc can only continue in a straight line for a short distance, and I have found that it will not follow the angular path of extremely 4: close confinement provided by the space occupied by the narrow portions 8 of the fuse strip.

I claim as my invention:

1. A fuse link having an area of reduced cross section, and an area of greater cross section, said area of greater cross section having a portion for terminal connection, the remaining portion of the area of greater cross section having an aperture therein. 5

2. A fuse link having areas of different cross section and in the area of greater cross section an aperture and an insulation material closing said aperture.

3. A fuse link having an area of reduced 6 cross section and an area of greater cross section having-an aperture therein and an insulating material attached to and enveloping the aperture and an adjacent portion of the link.

HENRY BUSSMANN.

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