G - Physics – 08 – B
Patent
G - Physics
08
B
340/128, 98/53
G08B 13/24 (2006.01)
Patent
CA 1242505
ABSTRACT OF THE DISCLOSURE A jalousie-type window with integral alarm circuit is disclosed. The alarm circuit wiring is completely enclosed within the window construction and includes positive and negative terminals connected respectively to the louver blades and to the shafts which rotate the blades between open and closed positions. An insulating air space is provided between each blade and its center shaft to prevent normally any flow of current therebetween. Any attempt to force the louver blades of the jalousie open will result in the completion of the electrical circuit by causing the blade to deform through the air space so that contact with the center shaft is made. The switch contacts of the circuit consist of a rectangular tube provided along one edge of each louver blade, and a rectangular center shaft housed within the tube, the rotation of which by a conventional turning mechanism causes the blades to open and close. Under normal operating conditions, electrical contact between the two switch points is prevented by insulating nylon separators located at the ends of each blade and interposed between the tube and the shaft. When any of the blades is forced open, the torque applied to the blade will deform the blade and cause contact between the blade tube and its associated center shaft to thereby complete the alarm circuit and cause the burglar alarm device to sound.
452798
Riches Mckenzie & Herbert Llp
Sosa Jesus M.
LandOfFree
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