US1067194A - Wiring for electric-call-bell circuits. - Google Patents

Description

G. A. PIERCE.

WIRING FOR ELECTRIC CALL BELL CIRCUITS.

APPLICATION rum) MAR. 24, 1910.

1,067,194. Patented July 8, 1913.

COLUMBIA vLANuuRAPn co, WASHINGTON. n. c.

GEORGE A. PIERCE, OF PHILADELPHIA, PENNSYLVANIA.

WIRING FOR ELECTRIC-CALL-BELL CIRCUITS.

LWWJEM.

Specification of Letters Patent.

Application filed March 24, 1910.

Patented July 8, 1913.

Serial No. 551,407.

To all whom it may concern Be it known that I, Gnonon A. Pinncn, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful. improvements in \Viring for Electrio-Call-Pel Circuits, of which the :lollowiug is a specification.

My invention relates to that class of wiring wherein a plurality of stations are providedwith electric calling apparatus that inter-connects each station with the other, and my objects are-first; to provide a system of wiring whereby the sending station may know that the operative circuit is completed through the receiving station, and second; to provide a system of wiring that will reduce to a minimum the number of inter-connecting wires leading from each station.

WVith these objects in view, my invention consists in a certain novel feature in the arrangement of wiring as will hereinafter be more fully described and pointed out in the claim, reference being had to the accompanying drawing, forming part of this invention and in which the figure is a wiring diagram which shows a plurality of stations wired in accordance with my improved method of wiring.

An application of the above-described wiring as applied to a plurality of stations is shown in the figure, wherein three stations are shown, viz: A, B and C, and between which signals are desired to be exchanged.

In said figure A designates a local station at which are located the annunciator drops a and a. 37 and 38 designate the contact points of a two-point switch and 39 and 40 designate contact points of a similar switch. 41 designates an alarm at said station to give an audible signal that the station is being called.

B designates a similar station to that of A and is provided with the annunciator drops 7) and Z). 27 and 28 designate the two points of a two-point switch and 29 and 30 designate similar points of a similar switch. 35 designates an alarm in the locality of said annunciator drops to give an audible alarm when said station 13 is being called.

C designates a similar station to that of A and B and is provided with annunciator drops 0 and c. 31 and 32 designate the two points of a two-point switch and 33 and 34; designate similar points of a sii'nilar switch. 36* designates an. alarm located near the said station C to give an audible alarm when said station is being called.

22 designates a source of clectro-motivc force that supplies electric energy to said system.

1, 52, 3 and 4t designate leads intcr-connect- I ing station B to said A. and G.

5, 5, 7 and S de nate leads inter-connect ing station C to stations A and B and l), 10, 11 and 12 designate leads inter-connecting station A to stations 13 and C, all of which will be readily understood by those skilled in the art to which. this invention relates.

Having thus described the various elements and wirii'ig connections throughout the several views, its mode of operation will be substantially as follows: It is desirous of station A to call station 13. The operator at station A will move the blade of the twopoint switch on the contact point 37 and a closed circuit will be established as follows: from positive side of battery, lead 10, lead 42, contact 37, ani'iunciator drop a, lead 9, lead. 1, annunciator drop o, contact 28, lead 13, bell 35, lead 4: to negative side of battery. It is desirous of station A to call station. 0: The operator at station A will move the blade of the two-point switch on the contact and a closed circuit will. be established as follows: from positive side of battery, lead 10, lead 42, contact 39, annunciator drop a, lead 12, lead 5, annunciator drop 0, contact 33, lead 4%, bell 36, lead (3 to negative side of battery. lit will be understood that the said switch will be returned to the normal. or off position when not in use.

From the foregoing description of the estal'ilished circuits it will. be seen that when the station A calls station B or (3 that the respective annunciator drop a or a will. be responsive to the operation of the two-point switch as well as the annunciator drop Z) or c, which are located at the station being called, thus accomplishing the heretofore first mentioned object of my said invention. It will be understood by those skilled in the art to which. this invention relates that the amount of wiring necessary for the ordinary way of wiring will be one section wire for each annunciator drop, one section wire for each circuit closing switch, and a positive and negative supply wire, or a total of N+2 wires (N equals number of section wires and 2 equals the two supply wires). From my improved method of wiring it will be seen that the number of wires required will be and for the circuits as shown requires four wires from each station, whereas the ordinary wiring would require six. The difference becomes more prominent when a larger number of section wires are used, as for instance twenty section wires plus two battery wires would be reduced to ten section wires and two battery wires, thereby effecting a saving of wire and accomplishing the heretofore mentioned second object of my said invention.

I do not Wish to limit myself to the use of the exact apparatus as shown, as it is evident that numerous appliances may re place that shown on the drawing, but

\Vhat I claim as new and desire to secure by Letters Patent, is,

An electrical system of signaling between stations, the same comprising a single source of energy, a plurality of signaling stations each of which stations includes the same number of annunciators as there are remaining stations to be called, a single electromagnetic calling alarm, and the same number of plural point switches as there are remaining stations to be called, and operating circuits, said circuits including a wire connection from one side of each alarm to one pole of the source of energy, wire connections from the other side of each alarm to contacts of the switches at the same station, a wire connection which connects one terminal of one annunciator at each station with one terminal of one annunciator at another station, a wire connection which connects one terminal of each annunciator at each station to the blade of one of the switches at the same station, and a wire connection from the remain ing contacts of the switches at each station to the other pole of the source of energy.

GEORGE A. PIERCE. \Vitnesses DAVID R. KNAPP, JAS. T. SMYTH.

Copies of this patent may be obtained for five cents. each, by addressing the Commissioner of Patents, Washington, D. G.

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