BURGLAR ALARM SYSTEM

AVERTISSEUR A SONNERIE

Claims

Claim.lst. In a burglar alarm system- the combination- with an electro magnet- of two armatures responsive to different strengths of current, an alarm bell or signal- and an annunciator or annunciators operated by- or through the medium of said armatures. 2nd. In a. burglar alarm System- the combination- with a main closed circuit including a resistance medium at the guarded structure and a local circuit at the alarm station- of an electro magnet having two armatures responsive to different strengths of current therein- an alarm bell or signal and annunciators, operated by or through the move- ment of said armatures. 3rd. In a burglar alarm system- the com- bination, with a main closed circuit including a resistance coil at the premises- and a local alarm circuit at the station, of an eleotro magnet- two armatures responsive to different strengths of current therein- annunciators controlled by said armatures and adapted to throw into operation the local alarm circuit upon the movement of said armatures- substantially as described. 4th. The herein-described burglar alarm system, consisting of a main closed circuit including a resistance Medium at the guarded premises- and a local alarm circuit at the station, an electro magnet having two armatures responsive to different strengths of entreat therein, and annunciator drops controlled by said armatures- the combination and arrangement being such that upon the movements of the armatures they and the annunciator drops each close the local circuit- for the purpose specified. 5th. In a burglar alarm system, the combination- with a look at the premises to be protected- of a switch mechanism operated by the look mechanism, for the purpose specified. 6th. In a burglar alarm system, the combination- with a permutation look, of an electrical shunt switch mechanism- substantially such as described- and operated by the bolt and tumblers of the look, for the purpose specified. 7th. In a burglar alarm system- the combination, with a look, of a test circuit and alarm or signal- and a switch mechanism therefor- operated by the look mechanisms substantially as set forth. 8th. In a burglar alarm system- the combination- with a look of a switch mechanism- a test circuit, and alarm or signal- and a switch mechan- ism therefor, both of said switch mechanisms being operated by the look mechanism- substantially as described. 9th. In a burglar alarm system- the combination, with an electrically protected lock and a resistance coil- of a shunt switch mechanism, a test circuit and alarm or signal and a switch mechanism thereofor both, of said switch mechanisms being operated by the look mechanism- substantially as and for the purpose set forth. 10th. IA a burglar alarm system, the combination- with a main circuit, of a local test circuit and alarm or signal at the guarded structure for the purpose sped- fied. llth. In a burglar alarm system, the combination, with a main circuit extending from alarm station to gua ed structure, of a line wire disposed in loops at the point to be guarded, connected to a resistance medium and returned over said loops- being knotted- braided or entangled therewith- substantially in the manner and for the purpose specified. 12th. In a burglar alarm system evolving the use of a main circuit extending from alarm station to guarded structure, and means whereby an alarm is given in response to a variation or. - ence in flow of current- a line wire disposed in loops at the point to be guarded, running thence to a resistance coil or medium and back to said loops- and knotted, braided or entangled with the wire so looped- for the purpose set forth. 13th. In a burglar alarm system, a screen composed of meshes of wire forming part of an electrical circuit, the positive and negative conductors being knotted or en- ' tangled together- substantially as and for the purpose specified. 14th. In a burglar alarm system, a combined switch and fastener, in combination with a window or screen substantially as and for the purpose described.