US357815A - Eleoteic bueglae alaem - Google Patents

Description

(No Model.) 2 SheetsSheet 1.

E. E CARR.

ELEGTRIG BURGLAR ALARM.

No. 357,815. Patented Feb. 15, 1887.

Fig.1.

' INVBNTOR:

ATTORNEYS.

N. PETERS. Phofluuthngnphar, Wuhirlgiom D. Q

(No Model.) I i 2 Sheets-Sheet 2."

r E. E. CARR.

ELECTRIC BURGLAR ALARM. Nb. 357,815. Patented Feb. 15, 1887.

' Figafi WITNESSES: INVEN TOR ATTORNEYS.

* UNITED STATES EDXVARD E. CARE, OF

PATENT OFFICE.

OHALMERS, INDIANA.

ELECTRIC BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 357,815, dated February 15, 1887.

Application filed June 1, 1886. ,Serial No. 203,851. (No model.)

To a whom, it may concern.-

Be it known that I, EDWARD E. CARR, of Chalmers, in the county of White and Statevof Indiana, have invented a new and useful Im- 5 provenlent in Electric Burglar-Alarms, of

which the following is a specification.

My invention relates to electric burglaralarms which are designed to be applied to doors and windows of dwellings, barns, stables, or other buildings in such a manner that the surreptitious raising of a window or opening of a door shall be made to break an electric circuit and sound a continuous alarm on a bell.

My invention consists in the peculiar arrangement of the circuit and contacts and means for locating the break, which I will now proceed to'fully describe.

Figure 1 is a front elevation of the alarmboard, showing the battery-connections and the electric circuits. Fig. 2 is asectional view of a window sash and frame, showing the means for breaking the circuit by the raising of the window. Fig. 3 shows a modified means for breaking circuit as applied to-a door.

In the drawings, A represents an electrical bell of that pattern in which the electric circuit is alternately made and broken to sound a continous alarm. For this-purpose the battery B is connected for the vibrating circuit with the binding-post 2' by wires km, and with binding-postj by wires a 0. From binding-post i a wire leads to the magnets a a, and from the magnets to the adjustable contactf, and from this contact to spring e on the armature Z), through the armature to spring h, and thence to the binding-post and the other pole of the battery. The act-ion of this vibrating bell is as follows: \Vhen the current is completed through the circuit, thus described, the armature bis attracted, and the hammer 0 carried thereby is made to strike the bell. As the armature is thus attracted the spring 0 is made to leave the contact f, and the current being broken the armature flies back again from the tension ofthe spring h,which thus re-establishes the circuit and gives another stroke on the bell. This is the ordinary form of vibrating bell. In connection with the circuit thus described another wire, 1) q, connects with the contactfof the bell, and this wire, together with 'l; m it, forms the long circuit, or the circuit in which the several circuit-breakers are placed, which are designed to be placed at the doors and windows of the house to secure the same, and all of which are contained in the circuit]: map g, which is a normally-closed circuit, and which holds the armature b away from the contactf, so that the short vibrating circuit is not completed as long as the long circuit is unbroken. As soon, however, as the long circuit is broken by the raising of a window, opening ofa door, or cutting of the wire, the vibrating circuit is established and a continuous'alarni is rung upon the bell.

In order to have the requisite number of circuit-breakers for the different windows and doors of a house and keep them all under in spection at a single point, I employ a series of plates, 0 G G" O, which are parallel with but insulated from each other,and connecting with these plates are a series ot'loops, E E'E' each of which loops has a circuit-breaking device, F F F, &c., in the same, which is adapted to be fitted into a window or door,so as to be operated by the opening of the same. These circuitbreakers consist simply of two springs, S S,insulated from each other and held in a framed, which springs are normally in contact when the springs are pressed together by the window when closed, and which, when relieved of pressure, separate and break the circuit. In fitting this circuit-breaker to the window, Fi 2,its frame t is screwed into the window'fraine, with the bend of one of the springs,S, projecting toward the edge of the sash, and the upper part of the edge of the sash by hearing against this bend forces the two springsin contact. The principal portion of the edge of the sash below the upper part is channeled or grooved, so that as soon as the sash is raised the bend of the spring S flies into the groove, and thereby breaking the contact between springs S S opens the long circuit and permits the vibrating circuit to act and sound an alarm. It will thus be seen that when the circuit-breakers F F F are in place in the windowsand the windows closed the current of the long circuit passes down from one plate,

0, to the circuit-breaker F, and up thence to the plate 0, then down again to the-circuitbreaker F in another window and back to the.

next plate, 0, and so on, and as soon as anyof the circuit-breakers open, from the surreptitious opening of the window or door, the vibrating current is established and the alarm given. Now, to locate the break from any given central point, the plates 0 O, &c., are arranged as an indicator, and a metal pin, D, is constructed so as to be inserted in holes between the plates, and by touching both adjacent plates to connect the same, so that when an alarm is sounded the pin D is successively inserted in the several holes between the different plates, and when its insertion stops the alarm this serves to indicate the fact that the window was opened whose circuit-breaker is in connection with the two plates between which the pin is inserted, for the reason that the pin re-establishes the long circuit which was broken at the window, and thus permanently breaks the vibrating circuit. It is easy, therefore, by placing suitable numbers or distinguishing-marks over these plate to locate the break made by a burglar.

In adapting the circuit-breakers F to doors they may be placed either in the hinge-joint or at the lockjoint; but I preferto locate them at the hinge-joint,and construct them as shown in Fig. 3, in which the hingeitself is employed by hoping a hole in oneleaf and placing an in sulated screw therein, which is connected to one wire, and connectingthe other wire to the leafof the hinge, so thatwhen the dooris opened it passes off the insulated screw, and when closed comes in contact with the same.

For rendering the alarm inoperativefl place in the circuitwire 7cm (which forms part of both the long and the vibrating circuit) the plates Z Z, which areinsulated or disconnected from each other, except when the metal pin Z is inserted in a hole between the same. By taking out this pin it will be seen that both the long circuit and the vibrating circuit are permanently broken, and the doors and windows may thus in the day-time be opened and shut without sounding the alarm; A similar pair of detached plates, r r,with hole between them and detachable pin T is interposed in the branch p q of the long circuit, the object of which is to permit the long circuit to be broken at the instrument for the purpose of regulating or adjusting the vibration of the bell-ringing mechanism.

From the foregoing description it will be seen that only a single battery is used for both circuits, and the same wire is m it forms a part of both the long and the vibrating circuit. When the long circuit extends to a barn or other outbuilding,there is employed a groundwire at each end to complete the circuit through the earth.

I am aware of the fact that an electric alarm- '7 bell has been combined with a short circuit for sounding a continuous alarm, and a long circuit, which, when broken by the opening of a door or window, allows the short circuit to be operated, and I am also aware that a series of switch-plates for testing and locating the break in the long circnit is not new, and Itherefore only claim the particular combination and arrangement of the parts shown and described.

Having thus described my invention, What I claim as new is- The combination, with the electric bell and battery connected by both a long and short circuit, as described, of the series of insulatorplates 0 G G O, the wires 1) q,connected with

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