US1097964A - Fuse. - Google Patents

Description

W. G. BANKS.

FUSE.

APPLICATION FILED SEPT. 5,'191-a.

1,097,964. Patented May 26, 1914.

INVENTOI? WITNESSES V A TTORNEYS UNITED STATES PATENT OFFICE.

WILLIAM C. BANKS, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO

NORTHWESTERN CONSTRUCTION COMPANY, OF NEW YORK, N. Y.,

01 NEW YORK.

Specification of Letters Patent. Application filed September 5, 1918. Serial No. 788,201.

A CORPORATION FUSE.

Patented May26, 19 14.

To all 'who'm- 1' t may concern Be it known that I, WILLIAM C. BANKS a citizen of the United States, residing in t e borough of Bronx, city and State of New York, have invented certain new and useful Improvements in Fuses, of which the following is a specification.

This invention relates to inolosed electric fuses for insertion in an electric circuit as a protective means against loss due to the flow of an excessive current in the circuit.

The invention is directed to the provision of a novel filling for such an inclosed fuse surrounding the fusible element and the tergreatly reduced.

minals to which it is connected whereby danger incident to blowing of the fuse is One feature of the invention resides in the provision of afilling material for an inclosed fuse consisting of a non-conducting, noncombustible material in the form of a multiplicity of threads or filaments, these threads being arranged irregularly in' any relation which they happen to occupy in the mass of material so that a multiplicity of minute air spaces are provided throughout the body of filamentary material. As a result of the employment of material of this character, minute air spaces are provided throughout the material into which the gases generated when the fuse is disrupted may expand and which therefore serve to relieve high pressure conditions within the inclosure of the fuse. The material which I have found most suitable for this purpose is a material known as glass wool, this being in the form of a multiplicity of threads of glass intertwined irregularly. This material is a good non conductor, is non-combustible and melts only at very high temperature.

Another feature of the invention resides in the provision of a powdered non-conducting, non-combustible material around the central portion ofthe fusible element which is reduced in cross-section so as to cause rupture at that point and a thread-like-material around the ends of the fusible strip and'particularly around the terminals. within'the inclosure of the fuse to which the' fusible strip is connected. v

In accordance with the invention, an inclosed fuse of the usual or any suitableconstruction is provided with a filling of a pow-- dered non-conducting material-'of -the char acter now commonly used around the central portion of the fusible strip, but at both ends of the inclosure different material is used, this latter being in the form of-amultiphcity ofthreads so that minute air spaces are rovided throughout the mass of three s. Preferably, a silicate in powdered form 1s employed in the central portion of the inclosure and glass wool is employed on either side of this around the terminals to which the fusible strip is connected. With this form of filling, the powdered, material is effective in preventing the holding ofan.

are when the fuse is blown and the air spaces throughout the filamentary material at the ends of the fuse assist in relieving high pressure conditions which may occur as a result of the generation of gas when the fuse is blown.

An embodiment of the invention is illus-' trated in the accompanyin drawing which shows an inclosed fuse o' a construction.

rupted. At each end of the fuse, gripping 1 members 6 semi-circular in form and tapered on their curv'edfaces are provided, one lying on either'side of the terminal 3. The tapered surfaces of these gripping members 6 I are adapted to engage the end of the tube 1.

A cap 7 is provided adapted to have threaded engagement with the end'of tube 1 and to engage the gripping members 6 so as to force them into the end of tube 1 as a result of which-they will-be forced toward each other and grip the terminal 3 between them. This construction permits of readily removing'the fusible strip 2 or the parts thereof after the strip has been broken and insertion of a new strip.

Within the tube l'is a filling 8 of a noncombustible, non conducting material in the form of. a multiplicity of threads irregularly disposed so that a multiplicity of minute air spaces are provided between the threads. Preferably I employ for this purpose a material known as glass wool. This thread-like material does not fill the entire interior of the tube 1; instead, a powdered non-combustible, non-conducting material of the character heretofore commonly employed in inclosed fuses is emplo ed in the central portion of the tube 1, that 1s, entirely around that portion of the fusible strip 2 where disruption is caused to take place by the diminution of the cross-sectional area of the strip. This powdered material is shown at 9. The thread-like material is employed at the ends of the tube 1 inclosing the ends of the terminals 3 which extend within the tube 1 and the connections between the terminals and the ends of the fusible strip.

I have found in practice that with a material of the character herein set forth, the danger incident to blowing of the fuse on the passage of an abnormally high current is greatly reduced.

Having now described my invention, what bers at the ends thereof, a fusible strip within the inclosureconnected to said members,*

and a filling of glass wool within the incloi..

sure, substantially as set forth.

2. An inclosed fuse comprising an inclosure of insulating material, metallic members at the ends thereof, terminals connected to said members and projecting within the inclosure, a fusible strip within the inclosure connected to the terminals, and a filling in said inclosure consisting of a powdered, noncombustible, non-conducting substance about said strip and glass wool about said terminals, substantially as set forth.

This specification si ed and witnessed this 2nd day of Septem er, 1913.

WILLIAM C. BANKS.

Witnesses:

CHARLES W. Scorr, FRED DASBAU.

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