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Publication numberUS1827366 A
Publication typeGrant
Publication dateOct 13, 1931
Filing dateOct 18, 1924
Publication numberUS 1827366 A, US 1827366A, US-A-1827366, US1827366 A, US1827366A
InventorsJ. J. Kertz
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1827366 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

' J. J. KERTZ' Oct. 13,1931.

BURGLAR ALARM Filed 001;. 18, 1924 I N VEN TOR.



Patented O 3 3 This invention relates to improvements in electrical bnrglar alarm systems and has for its primary -'object to-provide -asysten1 having provision for permitting aperson" to set -be'operatedwhen the' door isopened but not stop in its operation when the door is closed.

Another object of my invention is to provide a burglar alarmsystem of the above character including an open and a closed I I the closing ofthe door which causes the extencircuit whereby the alarm will be given and will ring constantly until it is again set. I With the above and other ob ects 1n. View as will appear as the 'descrlption"progresses,

' the invention resides in certain novelfeatures lrangement of parts as will be hereinafter more specifically described and cla med systemembodying the features of my in-I of construction and the combination and ar- In the drawings, I e v, Figure 1 1s a dlagrammatlc VIEW of the vention. V Figure 2 is a sectional view showlng a detail of one of the spring contacts on the door or closure; 1 V I Figure 3 is another view showing a diiferent type of contact system. 1

Referring now to the drawings, wherein like reference characters designate corr'e sponding-parts throughout the several views, 1 designates an entrance door to the preme ises, which it is desired to guard against unlawful entry or to notifya guard when entrance has been made therethroi lgh. In order f that the owner may leave the'protected prem"-- Vises without sounding an alarm, the following procedure is necessary. The door lis opened andfa key is inseried in I'fhe keleyslotz1 2 1 k3 which is al'ace on t e wa 1ns1 e p of a 0G 1 -25and25y-a beforethe dropgl2 is'energized. V v is.energized,*the; ar a; J

the premises and adjacent the door 1 for convenience and so arranged that the sliding e member 4 may be turned to the left thereby,

closing thecontacts 5, 6 its purpose being to A conductor ,7'leads from con:

tact 1 0, which comprises spring pressed the spring arm 32. f

'Whenthedoor l 'is-iopeni and theloc-k 1-3 ism turned to the left, the? drop 12% will not-be :Ienergized asthecircuit V 'tacts l0 but it will beenergizedwhi-lethe door i isbelng closed as thecircuit will be -ten1poararily:completedlbyithe engagement of thevaim' contacts 31 and 32,: the 'ffOImGIV be which is rductore8-o to the When the drop 12 plunger 'with'f an eXte arm 32 adjacent theretoandthrou gh which circuit is completed moinentarilyfduring a closing movement of thedoor which' carries l the contact operating finger 31 a and other fingers-31+b: i


operated by theispring contact 10 in the manner explained. I The circuit; being' completed from :the; battery 8 7 through the conductor 7 to contacts "6 and 5 thence through the-00114315 tductor 11 to'themagnet: coils of'theiautomatic drop12 to thei-springconta'ct 1O and through the circuit 9% to thebattery;iDuring the close 'ing of theidoor, the contacts-27 =are engaged 1 and make contact with the door icarryingli.;3

I r I withlthe usual W1I1I1g frame carried on! the :door and 1 covering the same and itiwill: be no tediathat T thIS'COIItZLCt is made before; the springiconw tact IOoperates; thereby battery '8a' through" the conductor. 8 b to the, contacts '27 hrough the; circuit ort-eom 8+.d:'to battery 8.a,i:thereby energizing the closed circuit' relay 26. and opening contacts-3155 time 13. 1 is attracted" thereby relea'singizthe T 'r an ingaheeontme1e rand-=20. 1 'Theclosing of the contactsi19and QOEther-eby connect an alarm circuit from: the .ipositive sidefofrbattery 8itogthe 'contacts 1L5 ands-e v -through;wirell itolarmature 13 to the lever-16 to c ontacts 19and20to thcontact flfiato'armae -tu're ':.25 -,-,a" te 1-wire 2'8-'-a to hell 28- and- 1 T1 has:mez,geenmlma New Year, Ass e'non' 0E memmmminbem OII RQ IKL NrNE Y e I n'sions3- l j formeid there- "on' which has 'w'ipingcontact with a spring From the contact-'6, la conductor l l leads V to relay 12 whi'ch, when momentarily ener- I armature 13, thise closing a circuit from relay 26 through conductor 7 i Y through wire 9 to the negative side of the battery 8. Now, when the door is open and the spring contacts 27 are not joined, the relay 26 is de-energized thereby closing the contacts 25 and 25a and closing a circuit to the bell 28 and drop 24:, which is accomplished through the battery 8 through the conductor 9 to the drop 24: and bell 28 through the conductor 28a to contacts 23 and 23-a and contacts 25 and 25-60 through the conductor 22 to battery 8, the coils of the drop 24 being shunted across the bell wire remain energized and close a circuit through the bell 28 causing it to ring constantly until the key 2 in look 3 is turned to the right side thereby opening the battery leaf contacts 5 and 6.

The opening of the contacts 5, 6, releases thecurrent from the relay 24 thereby opening the ringing contacts. 23, 23a. The

operation of the sliding element of the lock 3 to the right causes the lever 29 to force the plunger 30 so that the member 16 is pulled to the right to engage the notch in the armature 13. This opens the contacts 19, 20, and in this position, the alarm system is ready to be set. When the key operated device of the lock is turned to the left, the lever a is drawn away from the plunger 30 thereby allowing a space from the member 16 and contacts 19, 20, so that the proper operation of the circuit closing relay 12 may be set. This closing relay is operated, by closing the door 1 which makes proper contact as at 27, com

circuit, attracting armature 25-a of pletinga before the circuit closing device is relay 26 operated by the spring control member 31,

riding past the bent contact 32 as shown by Figure 2 of the drawings.

Although I have described my system with a certain degree of particularity, it is understood that the present disclosure has been made only by way of example and numerous changes in the details of construction and the electricity, said auxiliary circuit having interposed therein an electromagnetic switch, a screen for the entrance of said premises comprising a continuous conductor terminating in two separate contacts, which contacts are adapted, when the entrance door is being closed, to respectively engage the two last mentioned contacts and thereby effect the opening of said electro-magnetic switch, a door switch interposed. in the main circuit and adapted to be located adjacent the entrance to the premises, said switch being adapted to be closed subsequent to the closing of the circuit through the aforesaid screen, another electro-magnetic switch interposed in the alarm circuit and closeable upon the closing of the other electro-magnetic switchin the alarm circuit, means for connecting the alarm circuit toa source of electricity and an alarm interposed in the alarm circuit.

In testimony whereof I aflix my signature.


combination and arrangement of parts may 7 be resorted to without departing from the spirit and scope of the invention as hereinafter claimed.

Having thus described my invention, what i I claim as new 1s In a protective burglar alarm system, the combination comprising a main circuit, an alarm circuit in shunt of the main circuit and a wholly. independent auxiliary circuit, a manually controlled main switch, including alock for preventing surreptitious operation of said switch, an electro-magnetic drop interposed in the main circuit including an armature for said drop, a supplemental switch which'is normally held open by said armature when the magnet circuit of said electromagnetic drop is dead, a plurality of contacts adapted-to be located adjacent the en-' trance door to the premises to be protected, two of said contacts comprising the terminals of an auxiliary circuit including a source'of

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2747177 *Aug 2, 1952May 22, 1956Holmes Electric Protective ComBurglar alarm system for a movable closure
US2839736 *Dec 13, 1955Jun 17, 1958Tinsley RonaldAnti-theft alarm system
US4379289 *Mar 8, 1979Apr 5, 1983Gte Laboratories IncorporatedFiber optics security system
US7916019 *Oct 18, 2007Mar 29, 2011Commissariat A L'energie Atomique, Etablissement Public A Caractere Industriel Et CommercialDevice for detecting the relative position of two elements via electric circuit section having mechanical function in at least one of the elements
US20080094239 *Oct 18, 2007Apr 24, 2008Commissariat A L'energie AtomiqueDevice for detecting the relative position of two elements with improved integration
U.S. Classification340/545.1
Cooperative ClassificationG08B13/08