Non-defeatable safety mechanical actuators for appliances

Details Non-defeatable safety mechanical actuators for appliances Non-defeatable safety mechanical actuators for appliances

1988-06-22

1989-07-25

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 42, 307118, 335 18, 335 24, H02H 316

Patent

active

048519510

ABSTRACT:
A fail-safe immersion detector has a reset button which may be operated to return an appliance to operation after an immersion-caused short circuit has disappeared. However, if the short circuit remains, an operation of the reset button has no effect. Therefore, the user cannot defeat the fail-safe detector by the expedient of taping or otherwise holding down the reset button. A rocker switch enables a testing of the immersion detector, to be conducted to either side of the A.C. power line while preventing a short circuit across the line if an effort is made to simultaneously conduct tests to both sides of the line. Two test wires extend from the detector through the power cord to the appliance, where they are joined. The immersion detector operates via one of the two wires. The rocker switch conducts the test via the two test wires in series. Therefore, the rocker switch controlled test verifies the integrity of the one test wire.

REFERENCES:
patent: 4595894 (1986-06-01), Doyle et al.
patent: 4709293 (1987-11-01), Gershen et al.

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