Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Patent
1997-10-10
1999-07-20
Ip, Paul
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
318774, 318783, 361 24, H02P 144, H02D 540
Patent
active
059259965
ABSTRACT:
A secondary thermal overload device is connected to one winding of a motor having a bi-directional rotatable output shaft and is preset at a lower trip temperature than a trip temperature of a primary thermal overload device connected to the motor to deactivate only the one motor winding effecting closing movement of a garage door at a lower motor operating temperature and before the primary thermal overload device trips while enabling the motor winding associated with an opening movement of the garage door to be activated to open the garage door.
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Ip Paul
Whistler Corporation of Massachusetts
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