Patent ID: 8769878

Claim:
A method of converting an automatic door operator which controls an automatic motorized door, the said door moving over a defined path when the door is closing, said automatic door operator being of the type which utilizes photo eye obstruction sensing to signal said operator of an obstruction in said defined path of the door being controlled, said signal being of a given amplitude, periodicity and duty cycle, to operate with a switch sensing edge along a protected edge of the said door, said protected edge being that which would contact any obstruction in said defined path of the said door when the door is closing, comprised of the steps of: determining the amplitude, periodicity and duty cycle of the photo-eye signal which is in use to control the door operator to be converted; installing the switch sensing edge along the protected edge of the door; and providing for conversion of the existing signaling requirements of the automatic door operator to the signaling requirements of the switch sensing edge installed in terms of amplitude, periodicity and duty cycle of the door operator.