US760850A - Blow-out chute. - Google Patents

Description

PATENIED MAY 24, 1904.

P.B.00RBY. BLOW-OUT CHUTE.

APPLICATION FILED 00T.16, 1902.

N0 MODEL.

{VIVEN-Vorig Fred COVQLJ QM/W aqttq.

UNITED STATE-s atented May Q4, 1904.

PATENT OFFICE.

ERED B. COREY, OE SCHENECTADY, NEW YORK, AssiGNOR TO GENERAL ELECTRIC COMPANY,- A CORPORATION OE NEW YORK.

BLOW-'OUT CHUTE.

SPECIFICATION forming part of Letters Patent N0. 760,850, dated May 24, 1904.

Application filed October 16, 1902.

Be it known that I, FRED B. COREY, a citi- Zen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Blow-Out Chutes, of which the following is a specification.

This invention relates to an inclosure fora fuse, a lightning-arrester, or any terminals between which an arc is liable to form, the inclosure constituting a chutethrough which any arc formed between the terminals or by the melting of the fuse is driven by the force` of magnetism in plates mounted on the sides of the inclosure. Devices of this kind ,areI` usually made integral with the fuse or terminals whose arc they are designed to extin guish, an electromagnet being provided whose field of force cuts the path of the arc. It is impossible to apply such a magnetic blow-out to an ordinary open-air fuse without furnishing a complete device having terminalsl and blow-out combined. For many uses such a, device would be of prohibitive cost. My device is a blow-out chute which may be applied to an ordinary open-air fuse or terminals and which is cheap in cost.

Magnetic blow-out chutes las heretofore constructed are provided with a blow-out coil to develop the field which extinguishes the arc, and as the coils are connected in series with the terminals they'must be of suflicient cross-section to carry the entire current, thus requiring an expensive coil containing much copper. In my device I dispense with the auxiliary coils entirely and develop the magnetic field solely by the passage of the current through the fuse or between the terminals.' I accomplish this by mounting iron plates on or within the sides of the inclosure, and the current passing between these plates magnetizes them. This greatly reduces the cost of the device and conduces toward simplicity and compactness. The general features are the same as in my application, Serial No. 121,714, filed September 2, 1902; but in my present invention is included only an inclosure adapted to be applied to and withdrawn from a fuse or terminals of any kind between which an Serial No. 127,456. (No model.)

arc is liable to form, `no terminals whatever being connected with the inclosure. In order to insure a complete extinction of the arc, I so arrange the magnetic field that the path of least reluctance is always immediately behind the are, causing a maximum concentration of the field at that point. rThis is simpl y effected by placing the magnetic pole-pieces so that they extend oneither side of the path of the arc and short-circuiting the lines of force on one side, so that a magnetic field is established only on the other side. Thus when an arc is formed the field of force lies directly below the arc and repels the arc stream, and as the arc is stretched, duey tothe expulsive force of the magnetic field, this field follows it up until it is extinguished.

In carrying out my invention I make an inclosing chamber or chute of any non-combustible material and mount within or on the outer sides of the sides of the inclosure metallic plates, such as iron, of high permeability. These plates are so placed that they extend both above and below the line along which the current passes; but above that line.

and outside the inner walls of the chute I connect them with. iron yokes or rivets, which divert the lines of force from above the path of the current, thus concentrating the magnetic field below that path only. The current passing between the plates magnetizes them, anda magnetic field is established across the air-gap below. the fuse or terminals. Should the fuse blow or an arc strike across the terminals, the magnetic eld acting directly behind the arc bows it Outward; but as the arc bows the field of force follows it up and bows it more and more until it is extinguished.

My invention therefore comprises a blowout chute to be applied to or withdrawn from arcing-points in an electric circuit having iron plates mounted and overlapping on either side the line of passage of the current and adapted to be magnetized by the current passing within the chute; and, further, it comprises means on one side for diverting or short-circuiting the lines of force or reducing their density, thus establishing a strong field at only one side of the line along which the current passes.

In my former application, Serial No. 121,714, I showed a thermal cut-out with blow-out chute and fuse complete ready for connection in a circuit. In my present application I include only the inclosing box or chute adapted to be placed around or over any fuse er terminals that have already been set up.

In the accompanying drawingsI have shown an embodiment of my invention as placed around a fuse.

Figure 1 is a perspective view of the chute. Fig'. 2 is a longitudinal section on the line fr; a', and Fig'. 3 a cross-section showing one end of one of the iron yokes connected to one of the plates.

In Figs. 2 and 3, A represents a fuse of any well-known type placed between the contactterminals B and B', which are connected in the main circuit at M and N. C C are the sides, and D D the ends, of the inclosing chute and are made of fiber or other insulating' material. Set within the sides C C are the plates E E', Fig. 3, of wroughtiron or other material of high permeability. The shape of these plates is shown by the dotted line in Fig'. 2. They extend on either side of the fuse and are connected at their ends on one side by the yokes F F', which are also of wrought-iron or other material of high permeability. H H are lugs'for securing` the inclosure to the same base that the fuse is secured to. rIhus a current passing from the terminal B across the fuse A to the terminal B magnetizes the.

plates E E', the magnetic lines of force being carried by the yoles F F, thus forming' a lield directly below the fuse. Should an abnormal current pass across the fuse and melt it, thereby forming an arc across the terminals, the magnetic iield would bow the arc upward more and more untilit broke and was extinguished.

W'hat I claim as new, and desire'to secure by Letters Patent of the United States, is-

1. A chute, open at its base to permit application over circuit-terminals between which an are is liable to form and forming an inclosure for said terminals, having' plates of magnetic material at its sides polarized only by the passing of current within they chute.

2. A blow-out for electric arcs comprising an inclosure open at its base to permit application about circuit-terminals and having plates of mag'netic material mounted at its sides polarized by currents passing' between them and adapted to blow out any arc formed between the plates.

3. A removable inclosure for application about a 'fuse or arcing-terminals, having polepieces polarized by current passing' within the inclosure, said pole-pieces terminating in an air-gap at the rear oi' the path of the current.

4L. A removable inclosure for application about a fuse or the like having pole-pieces polarized by current passing within the inclosure, the pole-pieces being' so placed that the free poles overlap the line of passage ot' the current, whereby the magnetic lield which expels the arc-gases follows up the are stream.

5. A blow-out chute, open at both ends, arranged to be applied to and withdrawn from circuit-terminals and having' a magnetic circuit of high permeability with free poles at one side of the line of passage of the current and a low-resistance magnetic shunt at the other side located outside the inner chute-walls to prevent the establishment of a lield at that point.

6. A blow-out chute consisting of an open box having' iron plates at its sides adapted to be applied to or withdrawn from circuit-terminals.

7. A blow-out chute consisting' of a box adapted to be applied to and withdrawn from a fuse or circuit-terminals, said box having' iron plates in its side walls overlapping the level of the fuse.

8. A blow-out chute for electric arcs, comprising' a pair of iron plates rigidly mounted opposite each other and adapted to be applied to and withdrawn from the arcing path, said plates being' arranged to extend below the level of the arcing path.

9. A blow-out chute for a fuse or the like consisting' of a pair ot' iron plates rigidly mounted opposite each other and adapted to extend below the level of the fuse one on either side thereof and to be applied to and withdrawn therefrom, said plates being connected above the fuse-level by iron yolies.

10. A blow-out chute for a fuse or the like consisting of a pair of iron plates rigidly mounted opposite each other and adapted to extend below the level of the fuse one on either side thereofl and to be applied to and withdrawn therefrom, said plates being' connected above the fuse-level by iron yolies outside of the arc limits.

11. A blow-out chute consisting of a box adapted to be applied to and withdrawn from a fuse or circuit-terminals, said box having' iron plates in its side Walls, tapering to increase the field density.

In witness whereotl I have hereunto set my hand this 14th day of October, 1902.

FRED B. COREY.

Witnesses:

BENJAMIN B. HULL, HELEN OREORD.

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