US276960A

US276960A - Electric call

Info

Publication number: US276960A
Authority: US
Publication date: 1883-05-01
Anticipated expiration: 1900-05-01

Description

(No Model.)

LLLGTLLG GALL.

J. B. GURRIE'R 8v D. H. RICE.

. No. 276,960. Patented Ma.y1,18s. f

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Q PATENT OFFICE.

JACOB B. CURRIER AND DAVID HALL RICE, OF LOWELL, MASSACHUSETTS.

ELECTRIC CALL.

SPECIFICATION forming part of Letters Patent No. 276,960, dated May 1, 1883.

` Application inea March 1o, lesa. (No model.)

` lowing is a specification.

Our invention relates to individual electric 4 calls of the general character ot' those shown in the German patent to Maron, No. 1,944E of 1877, and in the patent to said` Currier and Rice, No. 240,010, dated April `12, 1881; and it consists in placing a series of ordinary electric call-bells at ditterent stations on the electric circuit, and placing in a shunt around each of said bells an electric make-and-break device controlled by a vibrating armature working isochrononsly with an electric make-andbreak mechanism at a distant station, by which make-and-brealr `mechanism said vibrating armature is operated by means of a magnet placed in the maincircuit inV proper position with relation to it 5 and it further consists in arranging a shunt around an electric bell placed in the main circuit, which is normally closed, and in breaking the said shunt by the operation of an isochronously-vibratin g armature vibrating in unison with a pulsatory or intermittent electric current passing over the circuit and through themagnet ofsaid armature; audit further consists in an improved form of shunt-circuit around the magnet of the circuit-breaker. l i

In the drawing, the figure represents an electric circuit provided with abattery and calling` mechanism for the central station and alarm and shunt mechanisms for the subscribers stations.

S represents the central station, and S2 and S3 the subscribers stations, upon the electric circuit A A.

B is the battery.

G G are grounds ot' the circuit.

C is the calling device, cfa Well-kn0wn construction, having vibrating circuit-breakers c c for breaking the electric circuit and producing a vibratory current of electricty to ring the individual alarm at the respective stations S2 S3. c is a shunt-circuit to be closed by the key c2, in order to send an impulse of electricity to linethrough the magnet of the circnitfbreaker directly, withoutvpassingthrough the latter to d or d2 either may be `electrically'connected at pleasure without disturbing the other.

A At the station S2, E is the bell, which consists of a springhammer,its magnetin circuit, and the gong e2, so placed that any electrical impulse over the circuit ot'average power will strike the gong.

a! is a shunt leading aroundthe bell at station S2, and composed of the wire-a3, springs a4 a?, and metal block c2. The springs c4 c4 are secured in the posts 0L5 a5 at one end, the Whole being placed upon a backing-of insulating material, so as to compel the electricity to pass over the circuit or shunt, as described. In their normal position the springs t4 o4 are in electrical contact with the metal block a2,

and the electric current will pass` over the shunt composedV of a3, a5, c, a2, a4, and 01,5, as

being a line of less resistance than the main circuit through the bell-magnet.

M is a magnet placed in the main circuit-just below the shunt. l y m is an armature pivoted atmz2 andA moved by electric impulses through the magnet M, similar fo a pendulum. This armature may be hung upon a spring instead ot' a pivot, if desired. This armature carries attached to it the curved bar m3, the projecting ends ot' which come underneath the springs ci* a4 at such a distance that no movement ot' the armature, resulting from the passage of a vibratory current of electricity through the magnet M, which isnot synchronous, or nearly so, With the vibrations of m', will cause these ends oit' 'm3 to reach the springs a u, due regard being ot' course had to the adjustment of the distance between the poles ot' its magnet and armature m; but when a vibratory current of electricity is passed through the magnet M synchronous with the vibration of the armature m its extent of movement will be augmented until the points of the arm m3 alternately reach and strike the springs c4 a4 at each end of the beat ofthe armature, and, breaking the electric oircuit through the shunt, force the electric current to pass through the alarm-magnet of station S2 and cause the alarm to be struck. The pivot m2, upon which the armature m' and curved bar m3 oscillate, is insulated from its point of support to insure the break of the shunt-circuit.

At station S3 is placed an alarm, with its magnet and shunt inA all respects similar to that at station S2, and provided in like manner with a magnet M, its vibrating armature m' and attached bar m3 vibrating upon the insulated pivot m2, the only difference being that the weight ofthe armature m', orits dis tance from the pivot m2, or both, so vary from those of the station S2 that a vibratory electric current synchronous with the vibrations of the one armature will not cause the other to reach and break its bell-shunt.

The circuit-breakers of the caller U are each tuned to break the circuit synchronously with one of the shunt-breaking armatures at one station only, and thus the bell of only that one station, or its alarm only, will be sounded without soundingv any ofthe others. The magnets M are preferably made of much less resistance than the alarm-magnets to insure the larger part of the electric current passing over the shunt and not sounding an alarm until its shunt is broken:

The starting mechanism for the circuitbreaker of the calleris operated as follows: The circuit-breaker contact-screws c6 c6 are placed so as to not quite touch the contact-springs c7 c7. By inserting the plug in the switch, between d and d',for instance, that ciicutbreak er is connected to the circuit; but owing to the space between c6 c' the circuit-breaker does not start. By pressing down the key c2 the line c' is completed and the current passes through A, c', c, the vibrator magnet, and c5 to circuit A', and pulls the circuit-breaker armature c toward its magnet. Upon releasing the key c2 the armature c files back and its spring c7 makes contact with screw cG,and the armature continues to vibrate and make and break the circuit until the switch-plug connecting d and d' is removed. This of course breaks the shunt at the distant station ofthe correspondingly-timed vibrator and sounds its alarm.

It is obvious that other modifications may be adopted without departing from the spirit of our invention. For instance, the armature m' may be made to strike and break the shunt directly,instead of through the medium ofthe curved bar m3; or the armature m' may bemade to operate some other device for breaking the circuit besides the arm m3; or the springs a4 a.'i may come directlyl into contactinstead of resting upon the block a2; but the essential features of our invention are an alarm mechanism constantly in circuit, and an electric shunt around said alarm mechanism capable of being broken, and a vibrating shunt-breakingarmature operated by a vibratory current of electricity passing throughits magnetin circuit synchronous with its rate of vibration; and, further, the placing of two such mechanisms at different stations, each adapted to vibrate and break its shunt in substantially a different time from that ofthe other.

Instead of a circuit-breaking mechanism, a device which sends regular undulatory currents over the circuit of sufficient variation and regularity in the undulations maybe usedas,for instance, an electric generator driven by regulating mechanism at a proper and regular speed, which will produce undulations synchronous with the movement of the shuntbreaking armature.

What we claim as new and of ourinvention 1. In combination with the electric circuit lA A', a circuit-breaker, an alarm mechanism -in the circuit, and a shunt around said alarm ,mechanisnn with the magnet M and'lts vibrating armature m', adapted to make and break said shunt by synchronous pulsations of electricity, substantially as described.

2. In combination with the electric circuit A A', two or more alarm mechanisms placed at dii'erent stations on the circuit, each provided with ash unt around it, and with the magnet M and its vibrating armature m', adapted to make and break said shunt, and having a substantially-different rate of vibration fromv that of the corresponding armature of the other stat-ions, substantially as described.

3. In combination with the electric circuit A A', two circuit-breakers placed at one station, and two alarm mechanisms lplaced at different stations on the circuit, each provided with a shunt around it, and with the magnet M and its vibrating armature m', adapted to make and break said shunt, and having a substantially-different rate of vibration from that ofthe otherstations, substantially as described.

4. In combination with the electric circuit A A', an alarm mechanism, an electric shunt around the same, the magnet M, and its vibrating armature m', adapted to alternately make andv break said shunt, substantially as described.

5. In combination with the electric circuit A A', the shunt c', having key c2, and leading from the battery around the circuit-breaker, and to the magnet on the battery side ot' the same in the caller C, substantiallyas described.

JACOB B. CURRIER. DAVID HALL RICE. Witnesses:

CEAS. F. Hows, WM. B. SPALDlNG.

ICO

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