US696172A - Circuit-breaking device. - Google Patents

Description

Patented Mar. 25, I902. A. J. HIGGS.

CIRCUlT BREAKING DEVICE.

(Application filed Dec. 22, 1900.)

' 2 Sheets-Shoat I.

(No Model.)

No. 696,172. Patented Mar. 25, I902.

A. J. HIGGS.

CIRCUIT BREAKING DEVICE.

(Appliation filed Dec. 22. 1900 (No Model.)

2 Sheets Sheet 2,

' otherwise be on it.

UNITED STATES PATENT OFFICE.

ALBERT J. IIIGGS, OF COLTON, CALIFORNIA.

CIRCUIT-BREAKING DEVICE.

SPECIFICATION forming part of Letters Patent No. 696,172, dated March 25, 1902. Application filed December 22, 1900. Serial No. 40,817. (No model.)

To n/ZZ whom it may concern:

Be it known that I, ALBERT J. HIG-GS, a citizen of the United States, residing at Golton, in the county of San Bernardino andState of California, have invented a new and useful Oircuit-Breakin g Device, of which the following is a specification.

My invention relates to the improvement on an electrical switchboard in which the circuit is broken by the fusion of a fusible strip of metal known as the fuse. My appliance is to work in conjunction with an electrical current and the switch and fuse now used.

The object of my invention is to provide a safety automatic switch wherever an electrical switch is required. The particular object, however, for which my appliance is designed is to afford a safety automatic switch where motors are used to transmit power for the running of machinery. To illustrate, suppose we are running a pumping plant with a threephase system of electricity and using a motor to transmit the power. Ourline is shortcireuited or traversed bya current of abnormal strength, and one of the fuses is fused. The amperage is therefore thrown onto two wires, and consequently the induction-wires of the motor are heated to an abnormal degree and liable to destruction. With the old switch it is necessary that it be thrown by hand in order to out the current from the mefor, in which case delays are unavoidable and oftentimes dangerous. My device throws the switch as soon as one of the fuses is melted, thus cutting off the current from the motor, thereby relieving the strain that would I attain this result by the mechanism shown in the accompanying drawings, in which Figure 1 is a front view of the entire switchboard in use. Fig. 2 is a front View of switchboard with covers to fuse-blocks removed and the switch thrown by the burning of one of the fuses. Fig. 3 is a side view of the switchboard, showing the attachment of the lever to the fuse and the weight to switch, covers to fuse-blocks removed. Fig. at shows the same as Fig. 3, except fuse-blocks are covered. Fig. 5 is a perspective view of the entire switchboard.

Sim ilarletters refer to similar parts throughout the several views.

In the accompanying drawings, W represents switch, A fuse-blocks, and e the fuse. These parts are old, and the detailed description of their different parts is omitted.

0c shows project-ions fitting onto switchboard to contain block D. This block is made detachable, so when used on a three-phase switch leg Y strikes the block, knocking it out of position when switch is thrown, thus giving the switch perfect freedom to drop. The object of this block and projections a is to hold silk cord 13, which attaches to handle of switch and weight E, in such a position as to pull switch when weight E is dropped.

F is a slotted projection to receive stem of weight E and pin G. When switch is in use, pin G passes through stem of weight E and projection F, thus supporting weight E.

N is a silk cord, one end of which is attached to weight P, the other to lever O.

J is also a silk cord, one end being tied to cord N, the other to lever M.

L is a wooden pin extending across the opening in the fuse-blocks, the object being to support lever M, which attaches to the fuse, a notch or slot being fitted near the end of the lever, so as to hook lightly onto the fuse. lVhile the fuse remains int-act this lever by means of cords N and J holds up lever O and 7 weight P. When the fuse is burned or destroyed, lever M falls out of position, causing weight P and lover O to drop. (It will be seen that the attachment to each fuse acts independently, and one or more fuses may burn out, causing the switch to be thrown, while the other fuse may remain intact.) This lever is attached to the switchboard by means of a projecting hinge K and when let fall strikes cord H, thereby pulling pin G. Cord H is connected to pin G at one end and projection O at the other. S designates projections on which to fasten cross-bar R, which is shown in Fig. 2.

Fig. 2 shows the switch thrown by one of the fuses being burned, c and 6 remaining intact. Dotted lines show position of switch in use. Dotted letters show position of the various parts they represent when in use. R represents a cross-bar extending across all the fuse-blocks, the covers being removed. This cross-bar serves the same purpose here as pin L in Fig. 1.

Synopsis: When fuse is destroyed, lever M falls out of place, causing weightP and lever O to drop. Lever 0 falls on cord I-I, thus pulling pin G and causing weight E to drop, thereby pulling switch.

I am aware that prior to my invention 10 switchboards have been used in various forms.

a second cord connecting one end of the pin with the support, a lever pivoted to the base, a second weight, a third cord connecting the free end of the lever with the second Weight, a fuse-block and fuse, a cross-bar extending across the front of the fuse-block, a lever with a notched end adapted to rest on the crossbar, the notched end being adapted to engage the fuse, afourth cord connecting the notched lever with the third cord, all so arranged that the melting of the fuse will cause the pivoted lever to withdraw the pin from the apertured projection thus allowing the weight to open the switch, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALBERT J. HIGGS.

Witnesses:

BENTON B. PORTER, DEVELLO ROBINSON.

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