US439929A - Method of and apparatus for connecting dynamos - Google Patents

Description

(No Model.)

0. T. CHILD.

METHOD OF AND APPARATUS FOR CONNECTING DYNAMOS. No. 439,929. Patented Nov. 4, 1890,

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UNITED STATES PATENT ()FFICE.

CHARLES T. CHILD, OF BROOKLYN, NEIV YORK.

METHOD OF AND APPARATUS FOR CONNECTING DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 439,929, dated November 4, 1890.

Application filed March 19, 1890. Serial No. 844,485. (No model.)

To aZZ whom it may concern.-

Be it known that 1, CHARLES T. CHILD, a citizen of the United States, residing at Brooklyn,1n the county of Kings and State of New York, have invented certain new and useful Improvements in Connecting Dynamos, of which the following is a specification.

My invention relates to a method of and apparatus for connecting and disconnecting a number of compound dynamo-machines with their working-circuits by means of which they may be operated in multiple-arc or parallel circuit. lVhcn a number of such generators are connected in multiple are to feed the same working-circuit, it is necessary to have the generators all working substantially in unisonthat is, they should be at substantially the same potential. Otherwise, the current produced by one of the dynamos will tend to drive the other dynamo operating at a less potential backward as a motor. To accomplish this purpose, the dynamos are connected together by What is termed a neutral conductor, which aids in maintaining the balance or potential of all the dynamos in the circuit. When these dynamos or generators are connected to or disconnected from the working-circuit and the neutral wire, in order to prevent accidents tending to destroy the generator or reverse it or otherwise interfere with its operation, it has been necessary to break the circuits in a certain definite order, as the positive, neutral, and negative con ductors, and any variation from this is liable to burn the armature or reverse the generator which is being cut in orou t, and thereby injuri ng the brushes, commutator, or other parts. in order to prevent any possibility of such accidents occurring, the object of my invention is to so arrange the circuits in connection with the generators and to use such apparatus that will prevent the possibility of such accidents; and my invention consists in the method of and apparatus for controlling the circuits in such a manner that all of these circuits will be opened or closed at practically the same in stant of time, and it will be impossible to open or close them through inadvertence or by unskilled persons in the wrong order, which would result in the evils before referred to.

Referring to the accompanying drawings,

Figure 1 is a diagrammatic representation of a system of circuits and means for controlling them involving my invention. Fig. 2 is a side view, and Fig. 3 a plan, of a switch device which I prefer to use in connection therewith.

In the drawings, A and B represent, respectively, the plus and minus conductors of the working-circuit, including lamps or other translating devices X.

C C C are diagrammatic representations of compoundwound dynamo machines or generators, any number of which may be used, and may be connected in multiple are so as to feed into the working-circuits A B. The conductor A, which we will suppose to be the plus or positive conductor, is connected by the conductors co a a to the brushes D, bearing on the commutator E of each machine, and the conductor or working-circuit B, which we will assume to be the minus or negative conductor, is connected by the conductors Z) b b with the terminals of the field-magnet coils F of each machine. The direct shunts for the field-magnets between the brushes D and G are indicated by the coils H. The neutral conductor I is connected by the wires it" 2' to the brush G of each of the generators. Under these connections if, forinstance, the negative conductor 1) was opened before the positive conductor a was opened, it is manifest that an abnormal current would pass through the armature and brushes of the generator 0, which would be liable to destroy or injure the generator, and in order that this cannot take place I inter-pose in the conductors to Z) "5, connecting the working-circuits A B and the neutral conductor I, a switch device K K K which is so arranged that all of the three circuits will be opened or closed practically at the same instant.

Vhile any switch device having the capabilities required may be used, I have illustrated in Figs. 1 and 2 what I consider to be the best form of switch. represents a base, of some insulating material, upon which are mounted the sockets M, having terminals on and set-screws m for the reception of the ends of the conductors, and pivoted in these sockets are the conductingarms N, which are normally held open by a In these figures, L

spring 0 or equivalent device, and which are adapted to fit into the jaws P, which are in turn provided with terminals 19 and set-screws p for the reception of the complementary ends of the conductors. These arms N, of which there are three shown inthe'drawings, are connected by an insulating-piece Q, provided with a handle R, by which they may be operated simultaneously, so that they may all be caused to open or close their respective circuits practically at the same instant of time.

Under these constructions and arrangements it will be seen that all the conductors leading to the compound-wound generator are simultaneously opened or closed, thereby rendering it impossible to so open or close the circuits thereof as to cause it to be injured or destroyed by the excessive or abnormal current passing through the generator or any portion thereof, and all danger of motoring or reversing or injuring the dynamo is avoided.

What I claim is 1. A method of connecting compoundwound dynamo-machines in multiple arc with the working-circuit, which consists in simultaneously making or breaking the positive, neutral, and negative circuits leading from the dynamo, substantially as described.

2. The method of connecting compoundwound dynamo-machines in multiple arc with the working-circuit, which consists in simultaneously making or breaking the positive, negative, and neutral conductors connected with said machine and with the main circuit, substantially as described.

3. The combination, with the working circuit and compound-Wound generators connected in multiple arc therewith, of a neutral circuit and a three-point switch interposed between the generator and circuits and arranged to make or break the positive, neutral, and negative circuits simultaneously, substantially as described.

4. The combination, in a system of electric generation wherein the generators are connected in multiple arc with the working-circuit, of a switch consisting of a base having three sets of terminals connected, respectively, with the positive, neutral, and. negative conductors or the generator, and three switchbars connected together and adapted to open and close the three circuits simultaneously, substantially as described.

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

' CHARLES T. CHILD.

Witnesses:

JAMES S. MILNER, W. S. MCARTHUR.

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