Adjustable electric bell

Details Adjustable electric bell Adjustable electric bell

1981-10-16

1983-10-11

Swann, III, Glen R.

Communications: electrical

Audible indication

Percussion-type sound producer

340398, 340402, G08B 300

Patent

active

044095899

ABSTRACT:
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 provided 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 provided 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.

REFERENCES:
patent: 4300128 (1981-11-01), Ishii
patent: 4360800 (1982-11-01), Ishii
patent: 4368458 (1983-01-01), Ishii

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