US396940A - Automatic electric cut-out - Google Patents

Description

(No Model.)

B. R. KNOWLES. AUTOMATIC ELECTRIC GUT-OUT.

No. 396,940 Patented Jan. 29, 1889.

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UNITED STATES PATENT Orrrcn.

ED\VARD R. KXOVLES, OF BROOKLYN, NEW YORK AUTOMATIC ELECTRIC CUT-OUT.

SPECIFICATION forming part of Letters Patent No. 396,90, dated January 29, 1889.

Application filed $eptemher 25, 1838. gerial No. 286,328. (No model.)

To a'ZZ whom it may concern:

Be it known that 1, EDwARD R. KNOWLES, a citizen of the United States, residing in Brooklyn, in the county of Kings and State of New York, have made certain new and useful Improvements in Automatic Electric Cut-Outs, of which the following is a specification.

The invention relates to automatic electric particular class in which the main circuit is 1 adapted to close a local circuit including a cut-out magnet.

The invention consists of a current-indicating apparatus of the kind described in my application filed September 25, 1888, Serial No. 286,329, in combination with a pair of contacts connected therewith, a pair of adjustable contacting devices, and a local circuit controlled thereby, and including a cutout magnet, whereby the burning out of the armature ot' the dynamo or reversals of the dynamo or discharges of the battery through the circuit are prevented when for any cause the circuit may be short-circuited grounded,

or the dynamo stopped or slowed down.

represents a general view of the apparatus and circuits.

The indicating device consists of a solenoid, A, having a semicircular core, 13, attached to a dipping arm or bar, C. The bar F carries a weight at one end to maintain the bar norcurrent flowing. I have extended the bar C at each end, in order to attach contactingpoints (2 c, which are usually pointed downward or at an angle. contacts will appear later on.

E represents racks or brackets of curved shape. These brackets carry ways or guides 1 corresponding mercury contact.

In the accompanying drawing the figure posing the cup 6 to be adjusted so that its the under side by a slidin lid, g, which may be adjusted in a longitudinal direction to insure the hook catching upon the lip, and thus holding the lever G. The lever pivoted at 9 and is pulled downward when released by a spring, hen locked to the armature, the lever makes contact with the spring 71.

The circuits are arranged as follows: The

f main circuit or the circuit to be controlled, cut-outs for dynamo-electric machines of that which includes a dynamo, M, leads from the generator through translating devices to the solenoid A of the indicator, thence to the lever G,to contact to line, and back to generator. A local circuit generated by battery X flows through magnet F, then branches and terminates in each of the mercury-cups c c. From the other side 0t battery the circuit leads to bar C of the indicator and terminates at each of the points c.

The operation of the device is as follows: The mercury-cups c and c are adjusted upon the guide and set so that the dipping of the bar C in either direction beyond a certain limit will establish contact between one or the other of the extremities of the bar and its Xow supcorresponding contact-point will connect with it when the indicator-points to 25 and the cup 6 to be set so that contact will be made with 5 it when the indicator points to 5, when the main current rises for any cause to the limit break the main circuit at The purpose of these the localcircuit will be closed and magnet F, mally horizontal and a pomter which playsin drawing up its armature, will release the letront of a scale, D, to indicate the amount of ver G, when it will inuuediz'itely drop and The same effect will be produced when the current in the main circuit drops to the limit. By this means the current can never rise to such an extent as to injure the dynamo, and can never fall below for a pair of mercury-cups, c c, which are;

constructed to be adjustable at any position upon the guide.

F represents an ordinary electro-magnet' acting upon its armature f in opposition to The lower end of the armature is l springf'. formed into a hook, and is adapted to pass through a slot in the lever G. slightly elongated and is partially covered on The slot is a fixed amount without opening the main circuit, and as the current never falls to Zero the batteries cannot discharge through the I dynamo, and the dynamo can never have its polarity changed.

Having described my invention, I claim 1. A main circuit including the coils of a current-indicator, the movable element of said current-indicator provided with a pair of con tacts, both of which connect with the same i side of a local generator. a pair of adjustable contacts adapted to connect with said pair of contacts upon the said moving element, said adjustable contacts being connected with the opposite side of said local generator.

2. The combii'lation, with a main circuit and a local circuit, the main circuitincluding the coils of a current-indicator, and the local circuit including a magnet adapted to open the main circuit, the movable element of the current-indicator carrying two contactpoints, forming one terminal of the local circuit, and two adjustable corresponding contacts forming the other terminal of said local circuit.

In an automatic cut-out, a pivoted arm carrying a contact on each side of its pivot, a curved support carrying corresponding adjustable contacts, an electro-magnetic device causing movement of the pivoted arm, a main

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