G - Physics – 08 – B
Patent
G - Physics
08
B
84/63
G08B 3/00 (2006.01) G10K 1/064 (2006.01)
Patent
CA 1087003
AUDIBLE ALARM WITH LAMINATED MAGNETIC CORE Abstract of the Disclosure An electrically actuated audible alarm having a magnetic structure comprising an assembly of laminations is provided to reduce eddy current losses. With the reduc- tion of eddy current losses, faster magnetic flux buildup is possible and an increased velocity of striker movement. The increased striker velocity permits delivery of a given quantum of energy to the gong with a reduced striker and/or armature mass which in turn facilitates even greater velocity. When actuated from an a.c. current source, a diode may be used in series with the winding to interrupt magnetic flux gener- ation on negative half cycles and permit return movement of armature and striker. Conventional interrupter contacts may be used when actuated from a d.c. source. A series diode provides for d.c. loop supervision. A multiple lead permits the audible alarm to comprise part of the loop circuit and thereby provide a supervisory signal if an audible alarm is missing.
283019
Borden Ladner Gervais Llp
General Signal Corporation
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