G - Physics – 08 – B
Patent
G - Physics
08
B
84/67
G08B 3/00 (2006.01) G10K 1/064 (2006.01)
Patent
CA 1172882
ABSTRACT OF THE DISCLOSURE An electrically driven bell includes an electric motor geared to drive a rotary cam assembly having formed on a face thereof two concentric circular cams each pro- vided with an angularly increasing ramp surface terminating in an abrupt step at the end of each revolution. A spring loaded cam follower engaged to a hammer is reciprocated by rotation of the cam to provide periodic impact against a bell. The hammer may include a return spring and the combination of a bias spring and the return spring can be utilized to produce a neutral position which according to its alignment will determine the strength of the impact. The rate of successive impacts may be adjusted by the gearing and the speed of the motor while the strength of the impact may be adjusted by the springs.
405327
Notifier Company
Swabey Ogilvy Renault
LandOfFree
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