US996279A - Alarm. - Google Patents

Description

J. A. ROBINSON.

ALARM.

APPLICATION FILED 11,411.2, 1908.

Patented June 27,1911,

2 SHEETS-SHEET 2.

31a/1g@ z A HomwtJ JAY A. ROBINSON, OF DENVER, COLORADO.

ALARM.

Specification of Letters Patent. Patented J 1111 27, 1911.

Application filed March 2, 1908. Serial o. 418,725.

To all whom it may concern:

Beit known that I, JAY A. ROBINSON, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Alarms; and -I` do declare the following to be a full, clear, and exact description 4of the invention, such as will enable lothers skilledl in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the let-ters and iigures of reference marked thereon, which form a part of this specification. Y Y

My invention relates -to improvements in alarms adapted for use inv connection with telephones.

In vmy improved construction an electromagnet normally located in a closed circuit,. acts to hold the receiver hook of the telephone in the depressed position, when the receiver is' removed. Provision is made whereby the electro-magnet circuit is broken by the opening of a door or window, in which event the receiver hook will spring upwardly -whereby the central otiice is notified. Provision is also made for breaking the circuit in the case of a fire whereby the temperaturerises suiliciently to perform this function through the instrumentality of a suitable device located in.' the circuit.

The invention just explained is set forth in my previous application Serial No. 399,371,

' led Oct. 26th, 1907, allowed-Feb- 13th1908.

The object of my present invention, is to introduce special alarm devices, which shall be set off simultaneously withthe breaking of the magnet circuit, one kind of alarm device being used in the case of the opening of a door or window as in an attempt to commit burglary; and another kind of an alarm set o when the magnet circuit is broken in case of lire, so that the central oiiice will be precisely informed as to the nature of the diiculty,

Having 'briefly outlined my improved construction, I will proceed todescribe the same in detail reference being made to the ac\ companying drawing imwhich is illustrated an embodiment thereof..

' In this drawing, Figure 1 illustrates the apparatus show-n in connection with means for breaking the magnet circuit resulting from either raising a window or opening a door, and alsoftin connection with a ther-v mostat adapted to break the magnet circuit and close the Acircuit in which a special alarm is located in case of iire. In this view means are also shown for operating a special alarm when the circuit is broken by opening. door or window. Fig. 2 is a sectional` View illustrating a special alarm to indicate burglary. Fig. 3 isa section taken on the line 3-3 Fig. 2 looking up wardly or in the direction of the arrow.

The same reference characters indicate the sameparts in all the views.

Let the numeral 5 designate an ordinary telephone; 6 the receiverhook thereof; 7 the receiver and 8 the mouth piece of the transmitter. To the frame work of the telephone. is attached a bracket 9 upon which rests an electro-magnet 10 which when in this position is located directly beneath the hook Gof the telephone, being preferably just in the rear ofthe bifurcated part of the hook. This hook which is ordinarily composed of brass, must` be equipped with a piece ofmagnetic material 12 in order that the magnet may be operative in the manner just explained. A As shown inthe drawing a conduct-or 13 leads from one terminal of the magnet 10 to a pole 14 of an electric source 15. From the opposite pole 16, a conductor 17 leads to a contact 18 located just above adoor 19 and adapted to be' engaged by a contact plate 2O attached to the upper end of the door. Located in suitable proximity to the contact 18 is a similar contact 21 which is also adapted to be engaged by the plate 2O when the door is in the closed position. From the plate 21 leads a conductor 22, to a contact 23 attached to the frame work 24 of a window 25. One` of the sash rails 26 vof this window is provided with a metal contact 27 adapted to bridge the space between the contact 23 and a similar contact y28 alsol mounted on the window frame.

From the contact 28 leads a conductor 29 to a similar contact 23a on the upper part of the frame, while from a contact 282L leads a conductor 30. The two contacts 23a and 28a are so located as to be operative in connection with the upper sash of the window.

The conductor 30 leads to the extremity' 31 of a thermostat 32, whose normal position is in engagement with the contact 33 from which leads a conductor 34 to a contacty 35 engaged by one extremityT of a switch arm 36 pivoted at 37. From the pivotal ex tremity of this switch arm leads a conductor ,s will move sufficiently to leave the contact 33 thus breaking the magnet circuit, and en- "gage the contact A thus closing'the circuit through the electric bell C. In this event the receiver hook will rise notifying central, and the sound of the bell will be heard at the' central oliiceA thus indicating the nature of the trouble since itwill be understood that when .the bell rings, there is a 'iire where the telephone is located.

From the conductor 22 leads a branch conductor 48 to the pivotal extremity 49 of a switch arm 50. This switch arm when in the closed'positio'n or that shown by`dotted lines in the drawing, engages a contact 51 from which leads a branch conductor 52 to the conductor 17. The last named construction is so arranged that by closing the switch arm 50, the door 19 may be opened and closed without giving the alarm, since it will be necessary when the other parts of the mechanism are arranged'to give the alarm, that the occupant or occupantslof the roomshall have a means of exit. The contacts 18 and 21 are of such length that after the door has been swung during its closing movement to engage the last named contacts, the door will still be open wide enough to allow the person leaving the room and being outside of the door, to reach'through and throw the switch arm 50 to the open position or that shown by full lines in the drawing. Again -'if an authorized person wishes to enter the room, it will also benecessary in order that the alarm may not be given, for him to close the switch arm before he disengages the door from the contacts 18 and21. The receiver hook Gis equipped with an upwardly projecting turned in the ho'ok. The normal position of this arm, however, isa-indicated in the drawing. The upper extremity Ezof this arm is enlarged and engages the protruding arm G of a pawl F which is acted on by a lspring H which has a tendency to throw the pawl out of engagement with a toothed wheel I fast on a spindle J journaled in the` opposite ends of a casing K'. Located also in the casing 1s a coil spring L one extremity of which is connected with the spindle J while the other extremity is attached to the casing. Th, .spring is wound up by applyinga, suitable key (not shown) to the protruding extremity M of the spindle which is fashioned to receive the key. By turning arm E which may be the spindle in the proper direction the spring L 1s placed under tension. As soon as this is done, the pawl F is pushed into engagement with the toothed wheel I and locked in the engaged position against'the tension of the spring F, -by the upper extremity of the arm E. To the spindle J is also attached a spring arm N provided at its outer extremity with a sort of clapper O adapted to slip over a toothed ring P which extends en tirely around the casing K. In the event that the magnet circuit is broken, and the receiver hook rises, the upper extremity E2 of the arm E willv be disengaged from the arm Gr, and the latter Awill then 'be free 'to leave the toothed wheel I under the inuence of the spring H, ,thus allowing the spindle J to rotate in response to the recoil ofthe spring L. Thiswill cause the arm N with yits clapper device O to move rapidly over the toothed ring P of the casing giving a peculiar noise which lis quite distinct from the bell alarm heretofore described 4kand given when the magnet circuit is broken due to a tire where the telephone is located. Assuming that the receiver hook is held' in the down position under the influence of the magnet,if it is desired to wind the spring L, the arm E `.may be turned in the receiver hook, so thatthe enlargement E2 of the arm will be in such position that its narrow or thin dimension will bein the line ofthe path of the arm G, and when in this position will allow the armto move outwardly in 'response to the sprin whereby the pawl F will be disengaged rom the toothed wheel I thus allowing the spindle to be turned freely in the direction indicated by the arrow in Fig. 3 for the purpose of winding the spring. As soon as the spring is wound, the pawl F is pushed into engagement with the toothed wheel I, andthe arm E turned to the posivtion shown 4in the drawing ,whereby its enlarged extremity E2-locks the pawl in the said position', until the receiver hookfrises and releases the pawl in the manner heretofore explained. l

From the foregoing description the use and operation ofmy improvements will be readily understood. 'Assuming that a tire occurs, and the thermostat bar moves out of engagementwith the contact 33 and into en.- gagement with the contact IA, the magnet circuit will be broken andthe circuit through the electric bell closed. At the same time the receiver hook will rise and disengage the arm E from the pawl F whereby both alarms will be sounded-'in the manner heretofore explained. However, in the event that a window or door is opened, whereby the magnet circuit is broken, 'the receiver lhook will rise and disengage the, arm E from the pawl F and sound the alarm only with which the pawl is connected. 'I hus central will be able to distinguish whether the diiiiculty results either from a fire or a burglary, since in the case of a fire both alarmsring while in the case of a burglary only onewill be heard, namely the mechanical alarm, as distinguished from the electric alarm or bell. Having thus described my invention, wha't' l claim is: n

1. The combination with a telephone and an alarm, of an electric circuit, an electromagnet located in the said circuit, the said magnet being located underneath theE telephone hook, thehook being equipped with a magnet-ic meiber 4whieby 'the "honk-wilflleey l dr'awn downwardly when the magnet is energized, Vmeans including two contact points located in the-circuit for breaking and closing the ,circuit,"I and means connected withl the ho0. lz for setting off the alarm when the circuit broken, substantially as described.

`hook, so that when they magnet is energized the hook will be drawn downwardly, means for denergizing the magnet to cause the receiver hook to be released, and means carried by the said hook for setting off the alarm when the hook is released, substantially as described.

I-.ntestimeny whereof I affix my signature in presence of two witnesses.

JAY A. ROBINSON.

VVitn'esses:

A. J. OBRIEN, DENA NELSON.

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