US880160A - Burglar-alarm system and apparatus therefor. - Google Patents

Description

No.880,1 6 0. 7 A PATENTBDPBB.25,1908.

M. R. NEY &' s. s. ULLMAN.

BURGLAR ALARM SYSTEM AND APPARATUS THERLFOR. Arvmcnlon' FILED $22125. 1907.

gmqqqggi I V UNITED STATES --PATENT OFFICE.

MILTON R. NEY AND SAMUEL S. ULLMAN, OF WASHINGTON, DISTRICT OF COLUMBIA.

BURGLAR-ALARM SYSTEM AND APPARATUS THEREFOR.

Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed September 25. 1907. Serial No. 394-481 United States, residing in the city of VVashington, in the District of Columbia, have invented certain new and useful Improvements in Burglar-Alarm Systems and Apparatus Therefor; and we hereby declare that the following is a full, clear, and exact-description of the same, such as will enable others skilled in the art to which it appertains to make,

practice, and use the same.

This invention relates to burglar alarm systems and ap aratus therefor, and comprises ,means wiereby ordinary telephone circuits and apparatus are employed for sending inalarm signals.

The object of the invention is to provide simple, inexpensive and reliable means for sending in burglar alarm signals over telephone circuits.

The invention is illustrated in the accom-' panying drawings, in which:

Figure 1. shows diagrammatically and in elevationthe said apparatus applied to an ordinary telephone set, and controlled by a normally open circuit. Fig. 2 is a similar View showing said apparatus as arranged for control by a normally closed circuit.

The apparatus, as shown in these figures, is arranged to be operated by the opening of a door; but it will be understood that any of the contact devices customarily used inburglar alarms and other. similar protective circuits for closing or breaking a circuit may be used, and therefore that the apparatus may be caused to operate upon the raising of'a window, or in fact upon the opening of anything which according, to existing and wellknown burglar alarm systems may be caused i to actuate a contact device.

Referring first to Fig. 1, numeral 1 designates a telephone transmitter; 2 a telephone. receiver; 3-the hook of the usual "receiverhook switch; 4,4, wires leading from said When the door is closed this pin 8 will be held back out of contact with contact piece 9 and so.will not close said circuit.

According to the present invention, means are provided whereby, when the burglar alarm is operated, a sound-producing instru ment, suc as an electric bell, is operated in proximity to the telephone transmitter, and whereby the hook of the receiver-hook switch is raised so as to connect said transmitter with the telephone circuit and cause the attention of the telephone operator to be attracted and to transmit the sound produced. by said hell or other instrument to such operator.

For raising the hook, 3, a sliding rod 11 is provided in convenient proximity to said hook, said rod provided with a spring 12 which, when permitted to do so, will raise said rod and with itthe receiver hook 3. The rod is normally held down by a detent pin 13 arranged to be retracted by amagnet 14 in circuit 10. When this circuit is completed by contact of pin 8 with contact piece 9, .and said magnet-14 is energized by the current from battery 15 in circuit 10, the de-,

tent is Withdrawn and rod 11 caused to rise and raisethe receiver hook 3, so connecting the telephone transmitter with the telephone circuit, in. the ordinary manner. At the same time a sound-producing instrument, such as a bell 16, in circuit 10 is caused to operate, the sound of this bell therefore bein transmitted by the telephone to the'centra station operator. It is assumed that the telephone system is the customary centralenergy telephone system, so that the raising of the receiver hook drops a shutter or li hts a signal-lamp or operates some other callim devlce under the observation of the central station operator, the same as if the telephone were operated for an ordinary call; and the operator, then plug ing into the circuit'of that transmitter, will hear the sound of the bell and will know that the burglar-alarm mechanism has been operated and will notify the proper persons.

In some cases it is preferred that burglar alarms shall operate upon a normally closed circuit. In such case the arrangement shown in Fig. 2 may be used, in which afrelay 17, controlled by the normally-closed circuit 10 in which is included a normally closed conma ne nd bell.

In many burglar alarm systems circuits are led through panels which a burglar is apt to cut through or break, or screens or atin s containing electric conductors w ich wi 1 be ruptured, brought intocontact with other conductors, or short-circuited, are provided; such circuits when so operated being caused to operate a rela or other electromagnetic device. It wi 1 be obvious that any of these usual devices may be employed ,for operatin the detent magnet 14 directly or through t 1e relay l7. Also, it will be obvious that any other contact device in a pro tective circuit, such for example as a thermostat designed to indicate a fire, maybe employed for operating circuit 10, detent magnet 14 and bell 16, either directly or through a relay, and therefore that the invention above described is not restricted to burglar alarms, but is equally applicable for 7 other classes of alarms or signals.

A switch 18 is commonly provided for cutting out the alarm apparatus when its operation is not desired.

What is claimed is:

1. Signaling apparatus such as described, comprising in combination spring-actuated receiver-hook-actuating means arranged to engage and actuate a receiver hook, a detent for said actuating means, a magnet for operating said detent, electrically-controlled sound producing means and a protective circuit arran ed to actuate said magnet and sound pro ucing means.

2. Signaling apparatus suchas described, comprising in combination spring-actuated receiver-ho0k-raising means arranged to enage and actuate a receiver hook, a detent or said actuating means, a magnet for opesoaeo crating said detent, electrically-controlled soundproducing means and a protective circuit arranged to actuate said magnet and sound producing means.

3.Signaling apparatus such as described,

' comprising in combination a telephone transmitter and hook switch, a spring-actuated hook-raising device adapted to engage and raise said hook, a detent for said hook-raising device, a magnet for operating said detent, a protective circuit therefor and means for operating said circuit comprisinga cont-act device, and sound-prmlucing means.

4. Signaling apparatus such as described, comprising in combination a telephone. transmitter and hook switch, a spring-actuatml hook-raising device adapted to engage and raise said hook, a detent for said hook-raising device, a magnet for operating'said detent, and automatic means comprising a protective circuit for operating said magnet, and sound-producing means.

5. Signaling apparatus such as described, comprising in combination a telephone transmitter and hook switch, a spring-actuated hook-raising device adapted to engage and raise said book, a detent for said hookraising

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