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Publication numberUS181078 A
Publication typeGrant
Publication dateAug 15, 1876
Filing dateOct 21, 1875
Publication numberUS 181078 A, US 181078A, US-A-181078, US181078 A, US181078A
InventorsJosephus N. Larked
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in electric burglar-alarms
US 181078 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

SSheets-SheetL I. N. LARNED.


No.181,078l Patented Aug.15,1a7e.


No.181,o7a Patented Aug.15,1e7e.

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BSheets-SheetS. J. N. LARNED.

ELECTRIC BURGLAR ALARMS. No.181,078 Patented Aug. 15, 1876.

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Specitication forming part of Letters Patent No. 1S 1,078, dated August 15, 1876; application tiled October 2l, 1875.

To all whom it may concern:

Be it known that I, JOSEPHUS N. l'nSrRyED,Y

of the city of Buffalo, county ot' Erie, and State ot' New York, have invented an Electric Casing, Lining, or Screen for Protective Purposes, and I do hereby declare the follow'- ing to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specic-atioii.

The object of my invention is to produce an alarm whenever a given space to be protected is invaded and it consists in the means hereinafter fully described.

Figure l represents a barrier of wires secured to a frame, together with electro-magnets, armatures, and a battery. Fig. 2 is a vertical section of a safe or other receptacle for valuables, representing a barrier ot' wires entirely surrounding the usual receptacle for articles, electro-magnets, armatures, and

wires connecting the barrier to the latter being also shown. Fig. 3 is a perspective View ota case entirely surrounded witha barrier ot' connected wires, the door being constructed to break the circuit of electricity through 'the same when opened, and to close said circuit when it is closed. Fig. 4 shows means for uniting a series ofthe barriers of wires shown in Fig. l to form a partially or wholly i11- closing cage or casing. Figs. 7, S, 9, and l0 show various ways of distributing the circuit.

The barrier is made from material capable oi' conducting electricity, such as wires, strips, rods, &c., which are properly wound or coated to insulate them from one another and from the wires or other objects with which they come in contact. These may be formed into the barrier by weaving, knitting, knotting, or by any of the methods of formingfab` rics.

In the drawing I have shown the barrier made by weaving, A representing the warp, and B the woot'. The terminal wires ot' the circuit c d are connected to the electro-magnets and the battery.

The circuit oi' electricity may pass through the whole ot' the warp and the whole ot' the woot', as shown in Fig. 8, or it may pass through the whole of the Woof and part otA the warp, as shown in Figs. l and 4; or it may pass through the whole ot' the warp and part of the woot, as shown in Figi); or it may pass through part ofthe warp and part of the woot', as shown inFig. 7, or it may pass backward and forward, crossing itselt one or more times, as shown in Fig. 10, either through the whole of the warp and woof, or through part of the warp and the whole ofthe woot', or part ot' the woot' and the whole of the warp, or through part ot" both.

The arrangement of the circuits in all the cases above enumerated, except that shown in Fig. 8, and especially in that shown in Fig. l0, prevents an outside conductor from one part to another to be introduced by a burglar who is an electrical expert, so as to permit the intervening wires to be cut out without breaking the circuit, as might readily be 'done if the circuit ran directly through the whole of the warp and woot.

The barrier may be supported upon a frame of wood or other suitable material.

It' by the attempt ot' any person to effect an entrance into the space desired to be protected one or more ot' the wires forming the electrical circuit is broken, the circuit is thereby opened, the armature ot' the electro-magnet S is released, and an alarm is produced by it through suitable and well-known means.

This alarm may be a sounding or an indicating one of any well-known construction.

The barrier, as thus described, may be used as a window or door screen, thus obviating the objection, especially in summer, to the use of the common burglar-alarm for doors and windows, which only permits the window or door to be raised or opened a few inches.

Then it is desired to protect safes or other receptacles, a series of these barriers may bev Q 'lmws contact with metal plate on the frame, or a metal plate to which one end of the circuit ot' the adjacent side barrier is connected when the door is closed, the opening of the same breaking the circuit.

One or more of these barriers may be placed opposite the entrance to the safe or receptacle, or a series of them may be placed around the same. When the barriers are placed within the safe or receptacle, as shown in Fig.

a? of the drawing, the ends of the circuit pass through an aperture in the same to the battery and electro-magnet, a suitable cement being` employed to close up the space left surrounding them.

These barriers can be made to form the walls of cells or other inclosures for prisoners, the breaking of the circuit by an attempt to escape indicating the same.

The wires which form the circuit cannot vbe pushed aside`to effect an entrance without breaking the saine, and, therefore, the circuit.

In Fig. 5 I have shown another means of carrying' out my invention when applied to safes or other receptacles. Secured to a suitable shell, N, of wood or other non-conducting material are a series of 'metal strips, 0, which are free to spring away from each other, as shown at P, and are held in contact with .each other by the shell Q of'wood or other non-conducting material, which is rigidly secured to the inner shell. These metal strips are disposed between the shells to form a circuit, traversing in an irregular path the space between the same. This circuit is completed through similar metall strips between the continuation of the shells forniingthe' door by vconnection through the hinges of the latter and a metal plate, R, which comes in contact with the end T of the circuit when the door is closed. If the outer shell Q is broken to effect an entrance, or it and the inner one are split, the met-a1 strips O spring away from each other, and thus break the circuit and produce the alarm; or, if the door is opened, the same result is produced.

I shall now proceed to describe my method and means of preventing the completion of the circuit between the space to be protected and the mechanism for producing the alarm. If but two'niain circuit-wires were used this completion of the circuit'could be cected by a person skilled in electrical science by bringing the two wires stripped together. vI prevent this in the following manner: Secured to or near the frame to which the barrier is attached, but insulated from said barrier and from each other, aretwo wires, l and 2, one of which passes to the battery and the other to a separate electro-magnet, X. These two wires and the two connecting the barrier with the battery and electro-magnet S are twisted or braided into a rope, and pass together from the barrier and separate at the electro-inagnets and battery.

An attempt to cut off the current by stripping the wires will be frustrated by the inability of the person to determine which ofthe four Wires are the proper ones to bring to'- gethcr. If all of them are brought into contact the circuit will be closed, and the armature of electro-magnet X will produce, through suitable mechanism, an alarm. The necessity of concealing the wires connecting the barrier with the electro-magnet and battery is in this way obviated.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. The combination of an electrical circuit lineally and superlicially distributed, formed by insulated wires connected together in such a manner that they cannot be separated or moved from one another without breakage, and so that if part of such wires be connected together to form said circuit, such part cannot be distinguished from the rest, with means for producing an alarm, substantially as shown and described.

2. rEhe combination of an electrical circuit lineally and superiicially distributed, formed by insulated wires connected together in such a manner that the current of electricity shall frequently' return backward in its progress' through said circuit, with means for producing an alarm, substantially as shown and described. 4 Y

3. The combination of an electrical circuit lineally and snperficially distributed, formed by metal strips held between two shells, which spring apart and break said circuit when the shells are split or broken, with means for pro'- ducing an alarm, substantially as shown and described.

ln testimony whereof I have signed my name to this speciiication in the presence of two subscribing witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3249686 *Sep 12, 1962May 3, 1966Eduard Hobrecker G M B HWire netting for use as electric conductor
US3424977 *May 4, 1966Jan 28, 1969Human Resources FoundationCapacitive device responsive to water vapor content of a gas including insulated conductive wire electrodes forming a grid
US3610808 *Nov 20, 1968Oct 5, 1971Lewis Eng CoArea security cable comprising strain and heat-responsive network
US3696373 *Aug 12, 1970Oct 3, 1972George Kenneth HornbrookElectric alarm screen
US3725891 *Sep 8, 1970Apr 3, 1973E MillerProtective building structure
US3763795 *Jun 28, 1972Oct 9, 1973Mosler Safe CoAlarm condition sensor
US3772674 *Sep 15, 1964Nov 13, 1973Martin Marietta CorpTamper resistant container
US3851602 *Feb 24, 1972Dec 3, 1974Gao Ges Automation OrgSafety box or the like
US3952295 *Aug 2, 1974Apr 20, 1976Gentex CorporationAlarm system for cargo box
US3993987 *Mar 3, 1975Nov 23, 1976Stevens Edward CLocking device having an integral alarm system
US4293778 *Feb 12, 1979Oct 6, 1981Sandstone, Inc.Anti-theft screen construction
US4814750 *Nov 20, 1987Mar 21, 1989Pace Window & Door Corp.Window screen alarm
US4852502 *Jul 16, 1987Aug 1, 1989Sven KlingbergSafety box for safeguarding documents and the like
US5285734 *Jul 16, 1992Feb 15, 1994W. L. Gore & Associates (Uk) Ltd.Security enclosures
US6215397Jul 17, 1998Apr 10, 2001Lindskog Innovation AbElectrical manually portable security case for the storage of theft attractive articles with an electrical mat having at least one elongated electrically conductive wire in a substantially continuous mesh, loop or eye structure
US6400268Jul 10, 2000Jun 4, 2002Kjell LindskogElectrical manually portable security case for the storage of theft attractive articles with an electrical mat having at least one elongated electrically conductive wire in a substantially continuous mesh, loop or eye structure
US20100313722 *Jun 17, 2010Dec 16, 2010Claus FastertDevice for cutting to size and handling a substantially extensive blank from a cfk semi-finished product and method
Cooperative ClassificationY10S200/12, G08B13/04