US1081278A - Electric burglar-alarm. - Google Patents

Description

H. S. BITTING.

ELECTRIC BURGLAR ALARM.

-APPLIOATION FILED DEG-.30,1912.

ywhm, l Patented De@ 9, 1913.

2 SHEETS-SHEET l.

I/VTNESSES H. S. B'ITTING.

ELECTRIC BURGLAR ALARM.

APPLICATION FILED 19130.30, 1912.

l,081,278 Patented De@.9,1913.

2 SHEETS-SHEET 2.

l/I/I TNEA M ZZ? J @A w f v f4 Allan/ry llh lllll sTaTns PATENT onirica..

HERVEY Si. BJETTING, 0F LANCASTER, PENNSYLVANJEAL ELECTRIC BURGLMMALRM.

Specification of Letters ltatent.

Patented Dec.. lli, i913.

, .Application filed December 30, 1912. Serial No. 739,260.

following to be a full, clear," and exact de# scription ot' the invention, such as will en able others skilled in the art to which it appertains to malte and use the same.

rlhis invention relates to certain improvements in the construction ot' apparatus employed in electric burglar alarms and in the arrangement ot circuits for the same.

rlhe principal object is to give a continui `ons alarm when a circuit including the protected property is tampered with in any Way, the replacing" of said circuit in its original condition at the point where the alarm originated being' ineffective for stopping the alarm, which can only be done by animproved resetting appliance operated by the occupant oi the property or other authorized person.

@ther objects Will become apparent from the following description.

The invention will first be described in vconnection with the accompanying1 dawings, which constitute a part ot' this specilication, and then set forth with more particulari'ty in the claims at the end of the description.

ln the drawings, in which the same reference characters are used to designate similar parts throughout all oit the views: Figure l 1s a diagrammatic View of a burglar alarm system embodying' this invention, showing' the property circuit closed and the alarm circuits ope-n; Fig. 2 is a similar vieur showing the property circuit open and the alarm circuits closed; Fig. il is a detailed View of one ol" the property circuit breakers applied to the trame ot a WindovvgFig. .lis a detailed vieuv of a sash loelt included in the property circuit; Fig. 5 is a eide elevation ot.

a relay such as is employed inthe' present system; Fig. 6 is a detailedview of a property circuit breaker applied to a door-trame, and Fig. l is another detailed View showing hovv the panels ot a door may be protected by an electric conductor included in the property circuit vand attached to an improved form of circuit breaker.

.its illustrated iny Figs. l and 2, the property circuit includes the wires A, relay magnet B, local battery or generator C, and any desired number of circuit breakers D. This circuit. may also include a cut out switch E. "lhe armature lever F, of the relay magnet B, is included in an alarm bell circuit which also comprises the Wires G (shown in heavy lines lor clearncss), contact peints ll, strong batterly or 2generator l, and bell L. The bell circuit may also have aout out switch lvl. The resetting circuit includes Wires N and N1 connected to the Wires (i of the bell circuit at opposite sides et the strongwbattery' l, as at n and nl, and to the Wires A near opposite terminals of the relay magnet, as at n.2 and nl. @ne of the Wires hl, h should include aypush button or switch 0 lwhich, when closed, will have the eii'ect of cutting said strong batteries ofthe bell circuit into the property circuit for the purpose oft' resetting" t-he system, as hereinafter explained. A second relay magnet lil and corresponding armature lever F1 may be employed for operating a. red lamp alarm circuit which includes, in addition to said armature lever F1 and the red lamp l), the Wires G1 connecting;r with the. city lighting* mains lt, the contact points H1, and the cut out. switch tl. The terminals of the magnet lll are connected with those ot the magnet B by bridging; wires T. 'lhe lamp circuitwill, thereiore, be operated simultaneously with the bell circuit.

rlhe battery C in the propcurtyy circuit is comparatively Weak, being justl .stron enough to give the magnets ll m sutilcient magnetism for holding the armature levers F and F1 out et contact vw'ith the Contact points .l-l and Ht, against tension ot the usual springs V and 'V1 attached to' said levers. Said battery is not EntrenaF enough to draw said armature le away 'from the contact points iadieu said levers have once been releaeedff ein their magnets by breaking the pro circuit. Consequently, when the property it is once broken or opened by tampering with any ot the circuit breakers tlierein or cutting: any ot its conducting Wires, the alarm bell will continue to ring and the red lamp continue to burn by reason ot their cir s being.;h closed by the armature levers en: into contact with the cmitact points lill under the influence o in the sprii F1, and the closing' ot said property circuit dit lill@ at the point Where the alarm originated will not stop the bell ringing or the lamp burning.

ln order to stop the alarms and reset the system, it is only necessary to close the switch O, whereupon the strong battery l in the bell circuit Will be cut into the property circuit, thus furnishing the requisite current to the magnets B and B1 to enable them to attract the armature levers F and F1 away from the Contact points H and H1; thereby breaking the bell and lamp circuits and closing the property circuit. The switch O is then opened again, leaving the battery C to alone retain said levers, so that when said property circuit is again broken and an attempt made to close it at the same point, the current in this circuit will not be strong enough to move the levers for breaking the alarm circuits. lt will also be observed that by operating said switch, the occupant of the building may easily tell whether everything' is properly closed because, ir a sash lock is left un'as; tened, or any of the other circuit breakers are lett open, the closing or" the switch will not stop the bell from ringing or put out the light. As shown in Fig. 5, the armature levers are insulated from the arches W oi' the relays, as at w, when said levers are' attracted to the magnets, While the contact points H and H1 close the bell and lamp circuits when said levers are drawn away from said magnets by the springs V and V1 upon the magnets being demagnetized by a brealr in the property circuit. It will thus be seen that for the purposes of this invention, the insulating point and contact point st been reversed in each relay from the pcsrions they occupy in an ordinary relay.

ln l j. 3, (il and rig indicate resilient contact pieces secured to a Window-trame 8 and adv held together by the sash lil/"hen e sash is raised, however, the contact piece Z1 viri separate from the Contact piece ,cl2 and or break the property including the Wires l which are z said contact pieces, tivo i sash lc also be ing con;

e swivel member o :o release from the par broken and the alarms given. 14:05. G, when door i0 is to a Wire ffii stretched it' the door. Unc end of said Wire A1 is secured to a springpressed contact piece JS which is normally in contact with a liXed contact piece (Z9, the latter being attached to another Wire A of the property circuit. It will be understood that all the panels of the door may be protected in this Way and that any desired number of Wires A1 may be stretched across each panel at suitable distances apart and arranged horizontally, vertically, or obliquely, so as to prevent a burglar from boring through or removing the panel without disturbing or severing at least one of said Wires. Even a slight tension on the Wire A1 will move the contact piece (Z8 away from the contact piece (Z9, thereby breaking the property circuit and giving an alarm, while the cutting of said Wire will have the same effect. The arrangement shown in Fig. 7 may also be employed to advantage on the boards or palings of chicken coops or fences, so that the removal of one of said boards or palings ivill give an alarm placed in the house or other convenient location.. lVhen the alarm s vstcln is installed in a store or other building, which is not. occupied at night, thc alarm bell and red lamp may be mounted on the front of the building, as on a goose neck ovcrhanging the street. rThe ringing of the bell Will attract the attention of a patrolman several blocks avvay and the light of the lamp Will indicate the exact location of the property attacked.

It will be understood that this invention is not restricted to the details of construction herein shown and described but is only limited to the essential structural features specified in the claims. For instance, While the battery or generator' in the bellcircuit is shown and described as strong` and that in the property circuit as Weak, these are merely comparative terms used to emphasize the important fact that the generator in the property circuit is too ivealr to close said circuit, while the generator in the alarm circuit is strong enough to help out said Weak generator for the pur-pose ot closing or resetting the property circuit, when desired.

Having thus described my invention what l claim as new and desire to secure by lietters Patent of the lnited States is:

l. The combination with an electric magnet and an armature lever therefor. of aI nornnilly closed property circuit including said magnet and a generator. a normally open alarm circuit i cluding` said armature lever and a second generator, and means for automatically moving the armature lever '3. fi`he combination with an electric inagcircuit when the property circuitl is -opened, the generator of the property circuit being incapable of exciting said magnet suiiiciently to overcome said means, and means for cutting thel generator of the alarm circuit into the property circuit for energizing said magnet sufficiently to overcome said means. 3. The combination with an electric mag` net and an armature lever therefor, of al normally closed property` circuit including lsaid magnet and a generator, a normally open alarm circuit including said armature lever and a second generator, means for automatically moving the armature lever laway from the magnet to close the alarm circuit vvhen the property circuit is opened, the generator of theproperty. circuit being incapable of exciting saidmagnet sufficiently to overcome said means, electric conductors connected to the alarm circuit at opposite sides ofthe generator therein `and to the property circuit adjacent the terminals of the magnet, and a circuit closer in said conductor, whereby said generator in the alarm circuit may be cut into the property circuit. for energizing said magnet suiiiciently to overcome said means.

. 4. The combination with an electric magnet and an armature lever therefor, of a normally closed property circuit including said magnet .and a generator, a normally open alarm circuit includingsaid armature lever and a. second generator, a second magnet and armature lever therefor, said magnets being electrically connected to 'one another, a second alarm circuit including the second armature lever, and means to automatically move the armature levers awayA from their respective magnets for closing said alarm circuits when the property circuit is opened, the generator of the property circuit being incapable of exciting either of said magnets' sufficiently toovercome said means, and means for cutting the generator in the alarm circuitV into the property circuit for energizing said ymagnets sufliciently to overcome said means.

5. The combination with' an electric magnet and an armature lever therefor, of a normally closed property circuit including said magnet and a generator, a normally open alarm circuit including said armature lever, `a bell, and a second generator, a second magnet 'and armature lever therefor, said magnets being electrically connected to one another, a second alarm circuit including the second armature lever and a lamp, means to automatically moveY the armature levers away from their respective magnets for closing said alarm circuits when the' property circuit is opened, the generator of the property circuit being incapable of exciting either of said vmagnets suiliciently to k overcome said means, and means for cutting the generator in the alarm circuit into the property circuit for energizing the magnets sufficiently to overcome said means.

vIn testimony whereof I ailix my signature in the presence of two Witnesses.

HERVEY S. BITTING. Witnesses: Y

JOSEPH SMITHGALL, H. S. SmiNoK.

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