Motor-driven exercise apparatus having runaway prevention system

Details Motor-driven exercise apparatus having runaway prevention system Motor-driven exercise apparatus having runaway prevention system

1986-09-30

1988-06-07

Picard, Leo P.

Undertaking

272100, 272DIG9, A63B 2306

Patent

active

047491817

ABSTRACT:
A motor-driven exercise apparatus is disclosed, which incorporates a plurality of runaway-preventing features, thus reducing the chance of injury to the user. A motor control circuit is effectively controlled by pulse width modulated commands from a CPU, and by frequency-variable feedback information. These data are converted to voltages and input to a differential amplifier. A relay switch is used to cause immediate power turn off at both speed and elevation motors if any of the following occurs: (a) loss of feedback signal from the speed feedback at the CPU, (b) too rapid speed change sensed by the CPU, (c) failure of the motor control circuit to receive a signal from the CPU within a certain period, or (d) an elevation motor runaway sensed by the CPU.

REFERENCES:
patent: 3711812 (1973-01-01), Cherry

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