Treadmill safety module

Details Treadmill safety module Treadmill safety module

1995-11-02

1996-11-05

Apley, Richard J.

Exercise devices

Involving user translation or physical simulation thereof

Treadmill for foot travel

482 4, 361 33, 361 51, H02P 500

Patent

active

055710620

ABSTRACT:
A safety module for a motor speed control circuit, when speed control circuit has a failure mode in which full power is applied to the motor being driven by the speed control circuit. The safety module has a high pass filter coupled to a variable voltage power output of the speed control circuit, and a threshold member coupled to an output of the high pass filter for passing a signal only if a change in the signal exceeds a predetermined value. A semiconductor short-circuiting switching device is coupled to the threshold device and is also coupled to the power terminals of the motor and to the output of the speed control circuit for shorting out the output of the speed control circuit responsive to an abrupt increase in a signal at the output of the speed control circuit which exceeds the predetermined value at the output of the speed control circuit.

REFERENCES:
patent: 3636545 (1972-01-01), Boyd et al.
patent: 4031439 (1977-06-01), Sakai et al.
patent: 4791345 (1988-12-01), Boillat

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