US2371051A - Alarm system - Google Patents

Description

March 6, 1945 C KENDlG 2,371,051

ALARM SYSTEM Filed March 29, 1943 AMPuF/se 1 Azeaer'affzwo s, INVENTOR.

QYWS? M ATTORNEY.

Patented Mar. 6, 1945 UNITED STATES PATENT OFFICE mm srsrnm Albert 0.1mm, Les Aiiteles, can. Application March 29, 1943,,Serlal No. 480,937 A 9 Claims.

This invention relates to an alarm system.

An object of the invention is to provide an alarm system for use in conjunction with a telephone system employing a phonograph which has a record with the desired message pertaining to the alarm recorded thereon, and to provide means whereby, in the event of a certain contingency the phonograph will be started in operation and thereafter the proper telephone More specifically, an object of the invention is to provide an alarm system adapted to be used in conjunction with a telephone employing a phonograph which has an electrically operated amplifier, such phonograph being preferable for its fidelity in reproducing the message recorded on the record. Such amplifiers generally employ tubes and for this reason a time allowance must be made to allow the tubes to warm up before the operator is called.

It is therefore another object of the invention to provide an alarm system useful in conjunction with a telephone which in the event of a certain contingency will first start operation of the phonograph and cause the amplifier thereof to be energized and allow a sufiicient time delay to occur to permit the tubes of the amplifier to warm up before establishing the telephone connection. In this way at the time that the telephone connection is established the phonograph and its amplifier will be in full normal operating condition to transmit the message recorded on the record to the telephone transmitter.

A further object of the invention is to provide an alarm system adapted to be used in conjunction with a telephone which employs a phonograph having a record with two recordings thereon one recording being of a message indicating that a burglary is being committed and the other recording being of a message indicating the existence of a fire, and to provide two tone arms for the phonograph, one for each recording, and to provide means for connecting the tone arm engaging the proper message with the amplifier in the event of either a'burglary or a fire.

With the foregoing and other objects in view, which will be made manifest in the following de tailed description and specifically pointed out in the appended claims, reference being had to the accompanying drawing for an illustrative embodiment of the invention, wherein the figure is a diagrammatic wiring diagram of the alarm system embodying the present invention.

Referring to the accompanying drawing wherein similar reference characters designate similar parts throughout, the alarm system embodying the present invention is designed to be energized by normal current supplied to buildlugs for lighting purposes and the like. It comprises a transformer the primary winding of which is indicated at 10 adapted to be connected by leads II and I2 to a source of current, not shown, which may be the conventional volt alternating current supplied to the building within which the alarm system is disposed. The secondary winding of the transformer indicated at I3, is in circuit with one or more detector wires It or the equivalent, which maybe arranged at or over windows, doors, or other openings, and which are intended to be broken on the window or door being opened by an unauthorized person so as to break the circuit through a relay Iii, the winding of which is in series with the secondary winding IS. The relay I5 has an armature l6 associated therewith which is normally attracted by the relay winding so as to disengage a contact I7. However,'if the detector winding I4 is broken or the circuit including the secondary winding l3 and the relay I5 is otherwise broken, armature l6 will be allowed'to fall and engage contact ll.

The leads II and II are connected by conductors l8 and I9 to the electric motor 20 of a phonograph, the conductor l9 including the armature l6 and the contact l1 and the conductor l8 including a contact 18a engageable by a brush carried by one of the tone arms. On the turntable of the phonograph which is rotated by the motor 20, there is a record 2| which has two separate recordings thereon. One of these recordings, such as for example the inner recording 23, I

may have a message recorded thereon such as A burglary is being committed at 299 B Street." This message may be repetitious, that is repeated over and over throughout the recording. Similarly, the outer recording 22 may have a message thereon indicative of existence of a fire, such as There is a fire at 299 B Street, it being assumed that the address 229 B Street is the address at which the alarm system has been installed.

Two pickups or tone arms 24 and 25 are provided, one tone arm being used in conjunction with each recording. Thus, as illustrated the needle on the tone arm 24 is engageable with the outer recording 22 and the needle on the tone arm 25 is engageable with the inner recording 23. The brush on the tone arm 24 is engageable with the contact [8a normally so that the circuit through the motor will'be normally closed when armature it engages contact I'I. However, when tone arm 24 nears the end of the outer recording 22 the brush carried thereby disengages contact I81: and thus breaks the circuit through the motor even though armature 16 may be still engaging contact l1.

One side of each tone arm is electrically connected, such as by conductors 28 and 21, to the amplifier 28, which, in turn, is connected to a loud speaker 29. The other side of each tone arm is connected by conductors 30 and 3| to contacts 32 and 33. Contacts 32 and 33 are engageable by a switch or armature 34 adapted to be actuated by a solenoid 35. It normally, how- ,ever, is an engagement with contact 32 and it is at all times electrically connected to the other side of the amplifier 28. Solenoid 35 is in circuit with a local battery 38 and a thermo-responsive means 31, the pointer of which is engageable with the contact 39. Thus, at normal temperature inasmuch as armature 35 is in normal engagement with contact 32 tone arm 25 is electrically connected to the amplifier 28. However, in the event that the temperature rises to some abnormal degree, such as for example 110 F., the pointer 38 on engaging contact 39 will close the circuit through the local battery 35 and through solenoid 35, thus attracting the armature 34 causing it to disengage contact 32 and to engage contact 33. This serves to disconnect tone army 25 from the amplifier 28 and to connect tone arm 24. to the amplifier in the event of fire. Across the conductors l8 and I9 there is connected a second transformer, the primary winding of which is indicated at 40. The secondary winding 4| of this transformer is connected to two solenoids 42 and 43. Solenoid 42, when energized, serves to lift a bar or weight 44 that is positioned on the telephone desk set 45 so as to weight the switch thereof when the receiver and transmitter 46 is removed therefrom. In the event that the telephone desk set forms a part of a system employing a central operator exclusively, solenoid 43 and its associatedstructure can be dispensed with. If the telephone is of the dial or automatic type as shown, solenoid 43 has a core 41 operatively connected to a lever 41a which is engageable with one of the finger openings of the dial. Lever 41a is intended to engage the finger opening on the dial which serves to call the operator. In other words, in order to set the construction the dial is rotated from its normal position and lever 41 caused to engage the operator opening which is usually the digit zero. The two solenoids 42 and 43 together with the secondary winding 41 are in circuit with a contact on tone arm 25 which is engageable with a spaced contact 48. The amplifier 28 conforms to the conventional phonograph amplifier employing tubes which require some small length of time to warm up in order to effectively transmit the message as picked up by the tone arm from the record to the speaker 29.

The thermo-responsive device 49 which may be similar to the thermo-responsive device 31 is arranged to have its pointer 59 engage a contact 5| to shunt across the connection I6-ll in the event that an abnormal temperature rise occurs. Preferably, this thermo-responsive device is designed to establish contact at a slightly higher temperature than the thermo-responsiv device 31 such as for example 120 F.

With the alarm system installed, itf-is readily employed with the conventional telephone and it is set by removing the receiver and transmitter 43 from the desk set, positioning the transmitter near the speaker 29v and the weight '"4'4-is positioned on the desk set to occupy the' place and weight of the receiver and transmitter 48. The armature 41 of the solenoid 43 is positioned to engage the dial so that when actuatedit will serve to call the operator. With the alarm system thus set, in the event that the window W is opened so as to break the circuit through the secondary l3 and the relay [5, armature l6 drops into engagement with contact I! and thus closes the circuit through the motor 29 and through the transformer winding 48. When the motor 20 starts operating this turns the turntable so as to rotate the record 2| beneath both tone arms 24 and 25. At the same time that the motor 20 is energized the circuit, including the amplifier U 28, is also energized so that the tubes of the amplifier immediately start to warm up which may require some small time delay. After this predetermined time has elapsed both tone arms 24 and 25 will have progressed somewhat toward the center of the record and as the tone arm 25.

progresses inwardly it eventually contacts contact 48 to close the circuit through the secondary winding 4i and the solenoids 42 and 43'. Solenoid 42 is effective to lift'the weight 44 to call the operator in the "event that the desk set is used with a telephone system employing a central operator exclusively. If the telephone is of the automatic or dial operated type the energizing of the solenoid 43 serves to operate the lever 41a to release the dial and-allow it to return to its normal position it being understood that the dial has been turned from the normal position at the time that the alarm system is set. The releasing of the dial and its return to normal serves to call the operator simultaneously with the lifting of the weight 44. Thus, the calling of the operator is delayed until the amplifier has warmed up and is infull operating condition.

When the operator is thus connected the message recorded on the record 2| is transmitted through tone arm 25, amplifier 28, and speaker 29 to the transmitter of the telephone and the operator being thus advised repetitiously of a burglary at the address given may notify police authorities to this effect. After the record has been traversed completelyby the tone arms, tone arm 24 may disengage contact I8a thus breaking the circuit through motor 20 and stopping the phonograph. Contact 48 may be so arranged that it will be simultaneously disengaged by tone arm 25 at the inner end of its movement, thus breaking the circuits through the solenoids 42 and 43. When the circuit. throughsolenoid 42 is broken weight 44 is allowed to return, re-

storing the desk set to its normal position exthe operation of the parts as before with the exception that tone arm 24 will deliver the message on the outer recording 22 to the amplifier. It will be noted that contact 48 is normally disengaged from tone arm 2| and is only engaged by it after the phonograph has started operation. Consequently, the tubes in the amplifier 28 are given an opportunity to warm up so that there will be a proper reproduction of the message through the loud speaker 29 at the time that the operator is called. It will be appreciated that should the operator be immediately called before the amplifier has warmed up and is in full working condition that she will receive no message from the speaker 29 and is apt to disregard the call. By postponing the call the operator until after the amplifier has had an opportunity to warm up the operator when called is immedi-' ately informed of the'burglary or the fire as the case may be. After the message has been com.- pletely delivered parts are restored to normal by the breaking of the circuit through the motor 20 accomplished by the disengagement of the contact [8a and by the breaking of the circuit through the solenoids 42 and 43 accomplished by the disengagement of contact ll.

It will be appreciated by those skilled in the art that the present alarm system is subject to great deal of alteration and modification in its being adapted to various telephone systems.

Various changes may be made in the details of construction without departing from the spirit or scope of the invention as defined by the appended claims- I I claim:

1. An alarm system for use in conjunction with a telephone including a phonograph having a I,

record with two recordings thereon, a tone arm engageable with each recording on the record, an amplifier, means normally connecting one tone arm to the amplifier, thermo-responsive means for connecting the other tone arm to the amplifier and disconnecting the first tone arm, means operable in the event of either of two contingencies for starting the phonograph and energizing its amplifier, and delayed action means for subsequently establishing a telephone connection to enable the message picked up by the connected tone arm to be supplied thereto from the amplifier.

4. An alarm system for use in conjunction with a telephone including a phonograph having a record with two recordings thereon a tone arm engageable with each recording on theirecord, an amplifier, means normally connecting one tone arm to the amplifier. thermo-responsive means for connecting the other tone arm to the amplifier and disconnecting the first tone arm, means operable in the event of either of two contingencies for starting the phonograph and energizing its amplifier, and means operable by one or the tone arms for subsequently establishing a telephone connection after one of the tone arms has progressed a predetermined distance across the record affording an opportunity for the amplifier to start normal operation prior to establishing the telephone connection whereby the message of the record can be supplied to the telephone immediately from the amplifier when the telephone connection is made.

ALBERT C. KENDIG.

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