US2863966A

US2863966A - Repeater fuse

Info

Publication number: US2863966A
Application number: US597936A
Authority: US
Inventors: Greber Henry
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-07-16
Filing date: 1956-07-16
Publication date: 1958-12-09
Anticipated expiration: 1975-12-09

Description

Dec. 9, 1958 GREBER 7 2,863,966

REPEATER FUSE Filed July 16, 1956 FIGS INVENTOR.

United States Patent REPEATER FUSE Henry Greber, New York, N. Y. Application July 16, 1956, Serial No. 597,936

7 Claims. (Cl. 200-124) The purpose of this is to provide a repeater fuse which can be used repeatedly to interrupt overcurrents. For this aim a fusible element made of metal of low melting point, such as tin or Woods metal, is placed on the upper part, inside a horizontal insulating tube. At overcurrent the fusible metal melts, pours down, and solidifies on the lower part of the inside wall of the tube. By turning the tube by 180 the solidified fusible metal comes in its original position and can be used again for overcurrent protection.

On the accompanying drawing, Fig. 1 shows a cross section of the fuse and Fig. 2, a cross section of the jaw contact. Fig. 3 indicates an application of the fuse for lighting panels, and Fig. 4 exemplifies a design of a repeater fuse with automatic reclosing.

The fuse, shown on Fig. 1, consists of an insulating tube 1, containing the fuse element 2. The ferrule 3 is placed on one end of the tube, whose other end is provided with two half-ferrules 4 and 5, which are separated by an insulating plate 6. The cross section of the ferrule 3 is preferably elliptical. Fig. 2 shows a jaw contact of half-ferrules 4 and 5, which snap into contacts 7 and 8. Whereas contact 7 is metallic, its counterpart 8 is made of insulating material. The jaw holding ferrule 3 is of customary design and consists of two metallic contacts such as 7 on Fig. 2. Fig. 3 shows an application of the above described fuse for lighting panels.

It consists of an insulating tube 9, which is fastened to a knob 10, by which the tube 9 with its ferrules 11, 12, 13 can be turned in the

jaws

14 and 15. Fig. 4 shows the application of the fuse for remote or automatic reclosure. The insulating tube 16, provided with its

ferrules

16, 17, 18 is placed in the jaw contacts 19, 20. Tube 17 carries a ratchet wheel 21 and a loose ratchet arm 22, and ratchet 25 connected by a linkage 23 with the core of the electromagnet 24.

In operation of the fuse in case of overcurrent the fusible element 1, on Fig. l, flows down, disconnects ferrules 3 and 4 and connects ferrules 3 and 5. In order to bring the fuse in operational position again 2,863,966 Patented Dec. 9, 1958 it has to be turned by around its horizontal axis. This can be done manually, by means of a knob 10 on Fig. 3, or by means of an electromagnet 24 on Fig. 4. In the latter case when the electromagnet is energized it turns by 180 the insulating tube 16, through ratchet 22, ratchet wheel 21 and linkage 23. The said electromagnet can be energized by means of a remote push button station or by a reclosing clock mechanism.

The shown embodiments of this invention are illustrative only. It is to be understood that many varia tions and modifications can be made without departure from the spirit of this invention and within the scope of the appended claims.

I claim:

1. Repeater fuse with horizontally mounted tube having one contact in form of a ferrule on one of its ends, and on its opposite end two contacts in form of halfferrules being insulated one from the other to provide separate contact areas, said tube being turnable around its longitudinal axis in fuse holder jaws, said ferrule being connected to any one of the two half-ferrules by means of a fusible link of metal.

2. Repeater fuse with horizontally mounted tube as in claim 1, said tube being rotatable in its contact jaws by means of an electromagnet which can be energized remotely.

3. Repeater fuse with horizontally mounted tube as in claim 1, said tube being rotatable in its contact jaws by means of an electric motor.

4. Repeater fuse as in claim 2, with said electromagnet being energized by a timing relay operating after the fuse has opened the circuit protected by it.

5. Repeater fuse as in claim 3, with said motor being energized by a timing relay after the fuse has opened the circuit protected by it.

6. A repeater fuse as in claim 1 with said fuse holder having two pairs of jaws one pair being of metal, the other pair of jaws consisting of one metallic contact and one of insulating material.

7.A repeater fuse as in claim 1 turnable around its horizontal axis by manual operation of an insulating knob directly attached to said tube.

References Cited in the file of this patent UNITED STATES PATENTS 948,704 Nagel Feb. 8, 1910 1,386,525 Oca-Balda et a1. Aug. 2, 1921 1,416,258 Brooks May 16, 1922 FOREIGN PATENTS 53,236 Denmark June 21, 1937 147,929 Switzerland Sept. 16, 1931 637,961 Great Britain May 31, 1950