US2230170A - Circuit closer for burglar alarms - Google Patents

Description

Jam 28, 1941. R. Q. TRAWEEK, JR 2,230,170

CIRCUIT CLOSER FOR BURGLAR ALARMS Filed Aug. 9, 1938 Raye/ #aww/ZJ:

INVENTOR ATTO R N EYS Patented Jan. 28, 1941 l UNITED STATES PATENT FFECE CIRCUIT CLOSER. FOR- BURGLAR ALARMS Roger Q. Traweek, Jr., Houston, Tex.

Application August 9, 1938, Serial No. 223,367

1 Claim. (Cl. Z110- 52) This invention relates to burglar alarms, and suitable for the purpose, and it will lbe noted its general object is to provide an alarm for use as best shown in Figure l that one corner of the With windows, doors and other closures including frame is provided with an opening therethrough transparent panes, such as glass or the like, as .for the passage of conductors 3 and 4.

5 my invention consists essentially of a pane of The conductors 3 and i are embedded Within k5 glass having spaced conductor Wires embedded the pane i and extend about the marginal edge therein and insulated from each other by the thereof, as well as insulated from each other by glass but in circuit with alarm means and a suitthe glass, in that the conductors are spaced from able source ci current, so that in the event the each other, as will be apparent. The conductors glass is broken the Wires contact and close the terminate at one of their ends within the pane 10 circuit to the alarm means. and are arranged in a manner to provide parallel A further object is to provide a burglar alarm portions for each conductor, and the parallel porincluding switch means that is rendered active tions of the conductor 3 and which are indicated to close the circuit, immediately upon contact by the reference numerals 5 and 5 have bridging of the glass embedded conductors, and the cirthe saine and connected thereto conductors 1 15 cuit remains closed even though the conductors arranged in zigzag row formation, While the become separated. parallel portions 8 and 9 oi the conductor 4 also Another object is to provide a burglar alarm have bridging the same and connected thereto of the character set forth that includes conductor conductors I arranged in zigzag row formation,

wires embedded in the glass in a manner, so that but of course are spaced and insulated from the 20 regardless or where the glass is broken, the Wires conductor 1, due to the arrangement of the remust necessarily Contact to close the circuit for spective portions of the conductors 3 and 4 with the purpose referred to. respect to each other, and as will 'be apparent A still further object is to provide a burglar upon inspection of Figure 2. It will be further alarm that is simple in construction, inexpensive noted as best shown in Figure 3 that the con- 25 to manufacture, easy to install, and extremely ductors l and le are disposed at right angles efficient in operation, use and serviceto each other, and it is believed that it will be This invention also consists in certain other obvious that in the event the pane is broken at features of construction and in the combination any place in its area, 'the conductors 'I and I0 and arrangement of the several parts, to be herewiil contact with each other, for a purpose which 30 inater fully described, illustrated in the accomwill be later described. panying drawing and speciiically pointed out in While the portions of the conductors 3 and 4 the appended claim. that are arranged within the pane are bare or in In describing the invention in detail, reference other words are not covered by insulating cover- Will be had to the accompanying drawing Whereing material, the portions of the conductors 3 35 in like characters denote like or corresponding and S that extend through the opening in the parts throughout the several views, and in which: frame 2, as well as other exterior port-ions thereof,

Figure l is a front view of my burglar alarm are covered by suitable insulating material. The glass. conductor 3 extends to a main switch Il that Fgure is a sectional View taken aDPIOXma'elikewise has a conductor l2 connected thereto 40 1y 0n 1121 2 2 0f Figure l: looking in the direc" that in turn is connected to a suitable source of tion 0f the WOWS; current, while the conductor 4 is connected to Figure 3 15 a dlagrammamc new of the circuit suitable alarm means, such as a bell I3, as shown foff'he altm' d t .1 1 ,u t t h 1. in Figure 3, and the bell is grounded by a con- Flgre lsta fetll Vlewdlu lis lilgt eculr ductor lli which has one end connected to the 45 arranzemen o e con C O1 Vs W m e bell conductor i5. While the alarm means is glass' shown as being a ben, it wm be obvious that it Referring to the drawing in detail, the reference numeral I indicates apane of glass or other can be Visual means, or other suitable audible suitable transparent means, and while the pane meansi 50 is shown as being square, it will of course be un- F1 0m the above descflptlon and disclosure 1n derstood that it can be made in any shape withthe drawing, it will be obvious that when the out departing from the spirit of the invention. main Switch ii iS Closed, and any portion of the The pane is mounted in a channel frame 2 that class embedded conductors should become disis preferably made from rubber or other material posed in contact, upon breaking of the glass as will lbe apparent, the circuit will be closed to the alarm means or bell I3.

Y While the circuit will be closed to the alarm means, in the event that the embedded conductors Should become disposed in contacting engagement, the circuit will be open, should the conductors become separated, and in order to eliminate that disadvantageous feature, I employ switch means in the above circuit which includes a base I5 having mounted thereon a relay including a magnet I7 and an armature arm I8, the relay being in circuit with the conductor 4 by a conductor I3 and with the valarm means by the conductor i5. The relay is primarily designed for operating a switch that includes an upright 2i] mounted on and rising from the base I6, with spring contact fingers 2| arranged in pairs thereon, for receiving contact members 22 carried by an arm 23 pivotally secured to the base I6. The armature arm I8 is likewise pivotally secured to the base and pivotally mounted between the ends of the armature arm I8 is one end of a lever 24 that has its opposite end engaging the switch arm 23, for moving the contact members 22 between the fingers 2|, for the latter to set up a gripping engagement therewith to hold the switch closed, and the circuit accordingly, when the relay is energized, as will be apparent. One pair of the contact ngers 2| is connected to the conductor 3, by a conductor 25, while the other pair is connected to the conductor 4 by a conductor 26.

It is believed that the operation of the switch means will be apparent but it might be mentioned that by use of the switch means, that in the event the glass embedded conductors should become separated, the alarm means will be continuously operated, and such as brought about by the relay being energized, for moving the switch arm 23 to closed position, through the instrumentality of the lever 24. In order to open the circuit, the

switch arm 23 must be manually moved to open` position. I have also illustrated guiding and supporting means 2 for the lever 24 and Which preferably includes a roller 28 having the lever 24 mounted thereon, as clearly shown in Figure 3.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is:

In an electric burglar alarm, a pane of glass for Windows, doors and the like, a pair of spaced conductors embedded within the pane to follow the marginal edge thereof in close proximity thereto and arranged to provide parallel portions, said conductors extending from said pane through one corner thereof and having one of their ends terminating within said pane, conductors connected to and bridging the parallel portions of each of the nrst conductors and arranged in row formation, the rows being in spaced planes and disposed at right angles to each other, the conductors of each row being disposed in zigzag formation and in equi-distantly spaced relation to each other, certain of the zigzag portions t of the conductors of one roW being disposed parallel with and in close proximity to certain of the zigzag portions of the conductors of the other row, a channel frame of insulating material with the pane mounted in thechannel thereof, and said frame having an opening in one of its corners for the passage of the .Erst conduct-ors therethrough for connection in circuit with an alarm.

ROGER Q. T'RAWEEK, JR.

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