US3231966A

US3231966A - Method of manufacturing a one piece fusible connector

Info

Publication number: US3231966A
Application number: US212686A
Authority: US
Inventors: Irving F Matthysse
Original assignee: Burndy Corp
Current assignee: FCI USA LLC
Priority date: 1962-07-26
Filing date: 1962-07-26
Publication date: 1966-02-01
Anticipated expiration: 1983-02-01
Also published as: GB1031836A; BR6350967D0; DE1939194U

Description

1966 1. F. MATTHYssE' 3,231,966

\ METHOD OF MANUFACTURING A ONE PIECE FUSIBLE CONNECTOR Filed July 26, 1962 INVENTOR.

United States Patent 3,231,966 METHQD 0F MANUFACTURING A ONE PIECE FUSIBLE CGNNECTOR Irving F. Mattliysse, Danbury, Conu., assignor to Burndy Corporation, a corporation of New York Filed July 26, 1962, Ser. No. 212,686 1 Claim. (Cl. 29-4555) This invention relates to a method of manufacturing a high capacity fuse connector which is essentially an electrical connector provided with a fusible element.

Considerable economy can be had in forming the fusible element out of the same piece of metal forming the body of the connector. This may be accomplished by taking a tubular piece of copper and flattening a central portion thereof which is subsequently blanked into the size of the fusible section required. The thickness of the fusible section so provided is twice the wall thickness of the tubular piece of copper.

It is an object of the invention to provide an increased arc chilling and deionizing ability of the fuse section above described. A further object is to accomplish the foregoing as economically as possible and preferably without the necessity of adding new parts to the fuse structure.

These and other objects of my invention are accomplished and new results obtained as will be apparent from the device described in the following specification, particularly the method pointed out in the claim and illustrated in the accompanying drawing in which:

FIG. 1 is a plan View partly in section of a one piece connector with a flattened fusible portion all made of tubular stock;

FIG. 2 is a side elevation of the same;

FIG. 3 is a similar view partly in section with the fusible portion spread apart and disposed in an arc quenching medium; and

FIG. 4 is a cross sectional view of the connector of FIG. 3 taken along the line 44.

The fusible connector 10, illustrated in FIGS. 1 and 2, is made of a piece of copper tubing of the desired diameter thickness and length.

Depending on the connection sought, either one end or the central portion of the tubing is flattened. In the connector illustrated, the central portion after flattening is thereafter blanked into the desired shape forming a laminated fusible element 12 from which the conductor receiving tubular portions 14 extend.

The fusible device so described is known in the power transmission art as a limiter. As an example, a limiter made from copper tubing having an outside diameter of 1.060 inches, and a wall thickness of 0.113 inch, when 3,231,966 Patented Feb. 1, 1966 operating at 480 volts, has an interrupting capacity of about 30,000 amperes when contained in a heat resistant enclosure filled with quartz sand.

Unexpectedly, by merely spreading apart the laminations of the fusible portion constituting the flattened walls of tube, the interrupting capacity will be nearly doubled.

Specifically, in FIG. 3 the

laminations

16 and 18 comprising the fusible portion 12 are spread apart a distance of about /2 inch, which will form two parallel paths. The distance is sufficient to cause an ample amount of the quartz sand 20 to enter between the laminations nearly doubling the surface area exposed to the sand. A heat resistant enclosure 22 is provided to retain the arc quenching material 20 in place. This will greatly increase the arc chilling and deionizing ability of the limiter.

The resulting fusible connector achieves a substantial increase in current interrupting capacity without an increase in cost.

I have thus described my invention, but I desire it understood that it is not confined to the particular forms or uses shown and described, the same being merely illustrative, and that the invention may be carried out in other ways without departing from the spirit of my invention and, therefore, I claim broadly the right to employ all equivalent instrumentalities coming within the scope of the appended claims, and by means of which objects of my invention are attained and new results accomplished, as it is obvious that the particular embodiments herein shown and described are only some of the many that can be employed to attain these objects and accomplish these results.

I claim:

The method of forming a fusible connector which comprises the steps of taking a hollow tubular piece of metal, flattening a central portion of said piece, blanking the flattened portion to a desired shape, spreading apart the layers of the flattened portion to provide a plurality of spaced apart fusible elements, and surrounding the entire surface of said fusible elements with a filler material.

References Cited by the Examiner UNITED STATES PATENTS 1,221,275 4/1917 Bleecker 200-132 2,259,053 10/1941 Xenis 200--135 2,988,620 6/1961 Kozacka 200- FOREIGN PATENTS 452,156 8/1936 Great Britain.

BERNARD A. GILHEANY, Primary Examiner.