US758701A - Electric burglar and fire alarm. - Google Patents

Description

'No. 758,701. PATENTED MAY 3, 1904. S. SGHWARZSCHILD.

ELECTRIC BURGLAR AND FIRE ALARM.

APPLICATION FILED FEB. 24. 1902. RENEWED OUT. 8, 1908.

N0 MODEL.

ghwonroz QVmwmW I no: Nnmux PETERS cu. wonxumo. wAsnmsYcm a c.

Patented May 3, 1904.

SOLOMON SOHWARZSOHILD, OF ROCHESTER, NEW YORK.

ELECTRIC BURGLAR AND FIRE ALARM.

SPECIFICATION forming part of Letters Patent No. 758,701, dated May 3, 1904.

Application filed February 24, 1902. Renewed October 8, 1903. Serial No. 176,31i. (N0 model.

To all whom it may concern:

Be it known that I, SOLOMON SGHWARZS CHILI), a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Electric Burglar and Fire Alarms, (Case O;) and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to improvements in electric burglar and fire alarms, and has for its principal object the utilization of a telephone-circuit for the transmission of an alarm-signal of the above characterwithout interfering with the subscribers telephone instrument connected in such circuit.

To this end my said invention consists in providing a premises, building, store, or the like, in which is located a subscribers telephone instrument or into which passes an ordinary telephone-circuit, with a local alarmcircnit in which is located means operating to send a call over the said telephone-circuit to a desired point, as to the central telephoneexchange, to indicate the locality from which the call is sent, and a characteristic signal, preferably an audible signal characterized by a peculiar sound, to indicate the nature of the call-t-hat is, the unauthorized entrance or attempted entrance of the premises, building, or the like or the presence of fire therein. Upon the operation of the alarm-circuit as described the central operators attention is attracted by the call in the usual manner, whereupon she places her set into communication with the subscribers line over which the call is sent, and immediately upon operating the listening-keya distinct sound of a peculiar character is heard, which indicates to her at once the presence of trouble of the above-mentioned nature upon the premises with which the line indicated by the call connects. Upon the reception of this signal the operator at once notifies police or other headquarters of the presence and location of the trouble.

Obviously if the, system is located in a large building employing a substation-exchange the signal would be sent there unless the former course be desired.

Moreover, my invention is applicable to either the old individual battery or the more modern central energy or common battery systems.

In order to more fully describe my said invention, reference will be had to the accompanying drawings, in which- Figure 1 is a diagram illustrating the principle of my invention, and Fig. 2 is a detail sectional view of one of the alarm-operating switches.

1 and 2 represent the conductors of a telephone-line connecting a subscribers outfit a with an exchange or other point, and 3 4 represent wires of the local alarmcircuit connecting to the magnet-coil terminals of an electromagnetic circuit-closer I), hereinafter described. In this local alarm circuit, which is usually upon the premises or in the building, room, or the like to be protected, is located a sourceof electricity, such as a battery 0, and one or more alarm-operating switches or contacts (Z, comprising any normally open switching means operated by an unauthorized entrance or attempted entrance of the protected premises or building and may be located upon the doors, windows, in the floor, or anywhere where they would be likely to the operated by an unauthorized person. A specific form of such switch is shown in Fig. 2, mounted on a door and comprising the contact-plate (Z and spring (Z countersunk in the door (Z and adapted to be held apart by the door-jamb cl when the door is closed, as shown. \Vhen the door is opened, the said spring will engage the contact d, and thus close the local circuit. Such devices are well known in this art and require no further description, I also locate in the local circuit any of the well-known circuit-closing devices operating automatically when the temperature surrounding them reaches a predetermined limit. 0, comprising a contact-maker a, connected in the local circuit and adapted to be held from engagement with a contact-point 0 also c'onnected in said local circuit by an easily-fusible strip a of any of the substances known in the Such a device is represented byart for such purposes. WVhen the temperature of the building rises to an abnormal height due tofire, the support will fuse or melt and allow the contact-maker e to engage the contact 6 and thus close the local circuit.

The magnetic circuit-closer '6 comprises, among other parts, four contacts 6, a pivoted arm provided with insulated contact-pieces 1), adapted to short-circuit said contacts in pairs, an electromagnet b and a pivoted armature b, having a lug adapted to normally engage the contact-maker and hold it out of engagement with the said contacts. One of the contacts 6 connects by wire 5 to one of the conductors of the main telephone-circuit, while another contact connects by wire 6, through the secondary of an induction-coil f, to the other conductor of said circuit. The remaining contacts of the group b are connect ed in the circuit '7 8, which includes battery 0,

' coil, and vibrating contact of vibrator h and the primary of said induction-coil f.

A switch g may be connected in the local circuit 3 L and located in any convenient place to be operated by an authorized person before entering the premises or building, so that he may open the alarm-circuit and prevent his entrance sounding an alarm-signal.

It will thus be seen that when any of the switches d or e are closed in the manner above pointed out the magnet b5 will become energized and attract its armature 6 This will release arm 6 and short-circuit the main telephone-line through contact-plate and secondary of induction-coil f. The circuit 7 8 will also be completed through contact-plate 6 when the vibrator it will begin to operate -and send a pulsatory current through the primary of said induction-coil. The current thus induced in the secondary of said induction-coil will operate the line-drop, or other apparatus at central and notify the operator there that a call has been sent in from a certain subscriber, giving the number in the usual manner. Then the operator connects her set to the calling-line in the usual manner and at once hears the continuous buzzing of the vibrator and will know immediately that the call is either a burglar or fire alarm, whereupon she notifies police or other headquarters, when the premises or building may be investigated.

Obviously the vibrator may be located in any convenient place and preferably where it is not likely to be heard by an unauthorized person entering or attempting to enter the building or other place to be protected.

Moreover, while I have shown the vibrator separate from the induction-coil f, obviously it may be operated by or from a part of the induction-coil itself, as is generally done with induction-coils operating with vibrators.

My invention is, moreover, susceptible to other changes and modificationswhich may be made without departing from the spirit thereof; but

\Vhat I claim, and desire to secure by Letters Patent of the United States, is*

1. In an electric-alarm system of the character described, the combination with a telephone-circuit, leading from a premises to be protected to atelephone-exchange and a source of energy, of a local alarm-circuit located on the premises to be protected, and a common actuating device, controlled by said local circuit,,for both operating the line-call at the said exchange and producing acharacteristic signal in said exchange indicating the nature of said call.

2. In an electric-alarm system of the character described, the combination with a telephone-circuit leading from a premises to be protected to a central exchange, of a local alarm-circuit, located upon the premises to be protected, and common means comprising a switch, induction-coil and vibrator, operated by said local circuit, for both operating the line-call at said exchange and producing a characteristic signal therein.

3. In an electric-alarm system of the character described, the combination with a telephone-circuit leading from the premises to be protected to a central exchange and a source of energy, of a local alarm-circuit located upon the premises to be protected, and common electromagnetic means controlled by said local circuit for both sending over said telephonecircuit a line-call and also a characteristic alarm-signal, said means comprising a vibrator and a switch operating to close the telephone-circuit and place said vibrator in operative connection therewith.

4. In an electric-alarm system of the character described, the combination with a telephone-line, of a local circuit located upon the premises to be protected, an induction-coil and vibrator operated by said local circuit and adapted to send a characteristic alarm-signal over said telephone-circuit.

5. In an electric-alarm system, the combination with a telephone circuit, of a local alarm-circuit located upon the premises to be protected, a switch, induction coil and vibrator operated by said alarmcircuit and adapted to send a characteristic alarm-signal over the telephone-circuit upon the operation of said local circuit.

IIO

6. In an electric-alarm system of the character described, the combination with a telephone-circuit connecting a subscribers telephone instrument with a central exchange, of a local alarm-circuit, a switch operated by said local alarm-circuit for closing the main telephonecircuit, and electromagnetic means operated by the said local circuit and operating inductively on the telephone-circuit to send a series of impulses over said telephone-circuit upon the operation of said switch, said impulses constituting a call to the central operator and also a characteristic signal indicating the nature of the call.

8. In an electric-alarm system of the character described, the combination with a telephone-line leading into a central exchange, of a local alarm-circuit, switches and a source of electricity connected in said local circuit, an

SOLOMON SOHWVARZSOHILD.

Witnesses:

\V. W. W. Ems, A. WV. ST. JOHN.

Images