US513526A - Michael j - Google Patents

Description

(No Model.) t

M. J. OSULLIVAN. FIRE ALARM TELEGRAPH SYSTEM.

Nb. 513,526. Patented Jan. 30, 1894;.

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UNITED "STATES MICHAEL J. O SULLIVAN, OF

BALTIMORE, MARYLAND, ASSIGNOR TO THOMAS JANNEY, JR, & O0.

FlRE-ALA RM-TELEGRAPH SYSTEM.

SPECIFICATION forming part of Letters Patent No. 513,526, dated January 30, 1894.

Application filed June 7, 1893. Serial No. 476,826. (No model.)

To all whom it m/try concern:

Be it known that 1, MICHAEL J. OSULLIVAN, acitizen of the United States, residing at Baltimore city, State of Maryland, have invented certain new and useful Improvements in Fire- Alarm-Telegraph Systems, of which the following is a specification.

My invention relates to an improvement in fire alarm telegraph systems wherein a number of sub-stations are in circuit with a principal station, and a signal being turned in at one of the sub-stations will be recorded at the principal station and the relay bell at the substation will repeat the signal as turned in at the principal station. The relay bell at the sub-station is not in circuit except when a signal is turned in from the sub-station, in which case the relay bell is thrownin automatically and will repeat the signal as turned in at the principal station. After the alarm has been sent in to the principal station and the circuit breaking wheel is returned to its normal po sition the ground is thrown out to so remain until another signal is turned in.

In the drawing the principal station and one of the boxes which form the sub-stations is shown with the cover of the box off, exposing the mechanism within the box.

Referring to the drawing the letter, A, in-

dicates the box or casing in which the signal mechanism is contained.

B, indicates the circuit breaking wheel which is located on a pivot, a, running transversely through the casing, A. A gear-wheel, O, is also located on pivot, a, and the circuitbreaking wheel, B, is rigid with respect to the rotation of the gear-wheel, C. A pinion, D, meshes with gear-wheel, O, and a crank, 61, and handle, (1, are attached to the pinion for operating the same and thus indirectly to operate the gear-wheel, C, and circuit-breaking wheel, B. The gear-wheel and pinion are employedin order that the circuit-breaking wheel may not be so rapidly rotated as to make the separate strokes of the signal as received at the principal station undistinguishable as might be the case were the handle attached directly to the circuit=breaking wheel, B.

The principal station, T, as shown comprises the relays, t, and, t, the wires, 1), '2), leading from the relays to the battery, and

secured therein by means of set-screwed.

The guide-piece, F, has recesses and carbon contacts, h h corresponding to those in the cross-arms, e, and in the depressed condition of the sliding contact-bar the carbon contacts, h, 72. and, h, h are respectively in contact.

A spiral spring, J, coiled around the contact-- bar abuts at one end against the collar, j, secured on-the said bar and at the other against the bushing, k, of insulating material forming the guide through which the bar, E, passes and insulating it from the guide-piece, F.

It will be seen that the tendency of the spring, J, is to depress the sliding rod. One of the main line circuit wires, E, passes from the relay, t, at the'principal station and is attached to the binding post, m, on the casing, A, and passes from there to the sliding contact-bar, to which it is attached by means of the set-screw, Z. The other main line wire passes from the relay, t', at the principal station and enters the casing through the binding post, m, and is attached directly or indirectly to the circuit-breaking wheel, B. If the current be traveling in the direction indicated by the darn-the main line circuit will comprise the main line wire, L, the sliding contact bar, E, the circuit-breaking wheel, B; the return main line wire, L, and the principal station, T.

Fuse wires, N, are placed in the main line wires on either side of the sub-station in order that should an excessive current be passed over the said wires the fuse wires will be melted and break the circuit and thus prevent the principal station from being burned out.

The ground wire, 0, from the sub-station is attached at one end to the guide piece, F, and

the other is grounded. The electro-magnet, P, is locatedin said ground lineand is adapted to operate the clapper, R, to repeat upon the bell, S, the signal as transmitted from the sub-station to the principal station. N ormally the sliding contact rod is in the position shown in the drawing in which the carbon contacts, h, M, are not in an engaged position.

The circuit is normally through the main line wires, the ground being out of circuit, and the relay bell, S, does not operate except when the ground is in circuit.

When in transmitting a signal, the circuit is broken, the ground is automatically thrown in, through the Wire, 0. It the contact-wheel, B, be turning to transmita signal and thefoot, e, of the. contact-bar beina depressed position between two of the contactpoints, b,- -upon the foot-piece first contacting with one of the contact-points t-heground wire, 0, will ground the-entire main line circuitand the bell, S,will sound, but the entire current will not flow-through the ground because the ground is a poorer conductorthan the main-line wires; but if one of the mainline wires be broken, the current will complete its-circuit through the ground line, 0,.

a safety means, whereby, even if one of the main li ne wires be broken, the system will still be in an operative condition. For example if the main-line wire, L, be broken,- when the contact-bar is in adepressed position and the carbon-contact points .are engaged, thecircuit will comprise the main-line wi-r.e,; L, the sliding contact rod,.E, the crossarrns, e, the support, F, the ground .wire,-O, the ground and the ground wire, 16, at the principal station.

Exceptwhen an alarm is being turned .in, the ground by wire, 0, isnot in circuiteven when one of the main-line wires is broken, because the carbon contacts which cut the ground in or .out, are only in contact when the sliding contact-bar is in .azdepressed position, and hence the bell, S, will only be sounded-when the contact-bar is so depressed.

Having described .my invention, I claim-.---

1. In-asignalbox, the combination of the main linecircuit wire, L connected'toa circuit-breaking wheel; a sliding contact bar main adapted .to alternately make and break contact with the circuit-breaking-wheel, when the latter is turned; the main-line circuit wire, L, attached to the sliding contact bar; a guide piece for the said contact bar and having contact points; insulation between the contact piece and said guide piece; a ground wire in electrical connection with said contact points; and contact points on the sliding contact-bar, norm-ally separated from, but adapted to contact with the said contact-points on the guide piece and thus cut in the ground wire when themain-line circuit is broken by turning the circuit-breaking wheel, and vice versa, as described' 2. In a device of the class described, the combination of the main-line oircuit-wire',"L', connected .to the circuit-breaking wheel; a sliding contact bar adapted to alternately make and break. con-tact with the said circuit-breaking wheel when the .saidwheel is turned; the main line circuit wire, L, .attached to the said contact-par a stationary guide-piece for the said sliding contact-bar and having contact points; insulation be tween the sliding contact-bar and the guidepiece; a ground wire in electrical connection with said contact-points; vanelectricbell .in

the line ofsaid ground wire; and contact points on the sliding contact-bar, normally separated from, but adapted to contact with the saidv contact points on the 1 said guide piece and thus out in the-ground wire, when the main-l-inecircuit isbroken byt-urningthe contact-breaking wheel.

3. In a device of the class described, the combination of the main-line circuittwire, L, connected to the circuit-breaking wheel; a sliding contact-bar having. crossarms and adapted to alternately .make and break contact with the circnit-breakingtwheelwhen-the latter is turned; the main line.circuit.wire,L, attached to thesaid sliding contact-bar; contact-points. on the cross-arms of the contactbar a stationary guide-piece, F, having-an insulated bushing, 70, through which thecontact-bar slides; contact points .on the said guide-piece and adapted toialternatelymake .;and break contact with the contact -p0ints on the cross-arms of the sliding-bar; and .a ground wire in electrical connection with the contact points onthecross-arms, as described.

-In testimony whereof Iaffix my signature in the presence of two witnesses.

MICHAEL J. OSULLlV-AN.

Witnesses ABRAM MACAULEY, Gno. MOGAFFRAY.

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