Stanley Automatic Openers

Rodger P Lemirande

James S Amtmann

The present invention is a load sensor for use in an automatic portal operator such as an industrial gate operator. An induction motor is employed to move the gate. The power factor of the AC electric power supplied to the induction motor is monitored. A safety operation is triggered when the power factor indicates the motor load is greater than a predetermined amount, as when an obstruction is encountered by the gate.

Obstruction detection in automatic portal control apparatus employing

An operator for a fence gate of the type which translates laterally on and in immediate parallel adjacent relationship to a section of stationary fence wherein the operator comprises an audible sounder for producing a warning signal in advance of and during the entirety of gate translation. A maximum run timer is also included for terminating gate motor drive and operation of the audible sounder.

Gate operator with persistant, audible warning signal

A control system for operating a bidirectional gate driven by a reversible electric motor includes an overload protection circuit to prevent motor current overload produced by gate obstructions and the like. The system includes control switches for operating gate opening and gate closing circuits which respectively energize the motor for rotation in opposite directions. The safety circuit includes a motor current sensing device and a first comparator which compares the level of sensed motor current with a temperature adjusted, selectable reference value and delivers a motor disabling signal to the opening and closing circuits if the sensed value exceeds the reference level. The safety circuit also includes a second comparator which compares the sensed current level with another reference value to produce the disabling signal in the event that the selected reference value of the first comparator is incorrect.

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Riverview, MI, United States of America

Rodger P Lemirande