Automatic shut-off appliance timer

Details Automatic shut-off appliance timer Automatic shut-off appliance timer

1988-03-16

1989-05-30

Scott, J. R.

Electricity: circuit makers and breakers

Retarded

Clock train

200 38A, 200 38FA, 200 38FB, 200 38F, H01H 700, H01H 4300

Patent

active

048353493

ABSTRACT:
An improved automatic shut-off appliance timer is disclosed which actuates an associated appliance at a set-time and deactuates it a fixed period of time later. The timer comprises a clockwork mechanism, including a cam wheel and a trip wheel which approach one another when the set-time is reached. The relative position of the two wheels is set to define the set-time. When the set-time is reached, a cam follower resting on one of the cam wheel and trip wheel is permitted to move axially, moving a switch shaft and allowing electrical contacts to abut, closing the circuit of the associated appliance. Thereafter, a sector gear also comprised by the switch shaft is engaged by the motor, positively rotating the switch shaft. A cam follower integrally carried by the switch shaft then moves along a drop-off cam formed integrally with the front plate of the timer. When the predetermined period of time has passed, the drop-off cam allows the switch shaft to move further axially, which separates the contacts and deactuates the appliance.

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