Abstract: A conductive cord connection system for a movable sliding door with an electrical sensing edge provides a simple and inexpensive cord arrangement. The conductive cord extends, with the door closed, directly from the sensing edge through a door bracket and a wall bracket to a motor operator. With the wall bracket, which frictionally holds the cord, positioned adjacent to the door and spaced from the door bracket, a distance that is one half of the distance of total door travel, the traveling cord portion is substantially straight in the full open and closed positions of the door. When the door is opening or closing, a loop formed in the traveling cord portion does not exceed in length 25 percent of the full door travel.

Abstract: A power door safety sensing strip with a bracket strip for attachment to the face of a power operated garage door. The sensing strip includes a flexible insulating tubular member having a bell-like shaped cross section with a wide inner face. A flat insulating member fastened to a narrow section of the bell-like member extends to the wide inner face. Conductive surfaces on the wide inner face and on the flexible insulating member are moved into contact upon deformation of the bell-like member, thereby providing electrical contact. A Z-shaped bracket to attach the sensing strip to the face of a power operated door has one leg adapted to be attached to the door face. Another leg of the bracket, formed with a U-shaped receptacle, receives and holds the sensing strip so that it extends a short distance beyond the door edge.

Abstract: A reversing circuit including an obstruction-sensing device adapted to be used with an electrically powered door or gate, which when connected to a standard motor operator which utilizes an A.C. control voltage and has a two or three button control station (open, close and optional stop) gives the operator capability to reverse power the door or gate should it engage an obstruction when closing. The reversing circuit is connected to the pushbutton wiring of the motor operator and utilizes the control voltage that appears between the stop-open terminal pair when the door is not opening nor at full open, and that appears between the stop-close terminal pair when the door is not closing nor at full close, as a limited power supply for powering the circuit. Full closure of the door or gate deactivates reopening section of the circuit so as to preclude opening of the door from outside by activating the sensing device.

Abstract: A power door sensing strip incorporates a pair of electrical conductors positioned in a sealed plastic tube and supported in a molded foam block so that external forces result in contact between the conductors. Reliable operation is afforded by the absense of internal supports between the conductors. Further, short circuits caused by moisture and contaminants entering the foam through breaks in an outer jacket are eliminated. Trimmable tails and electrical connections on the ends of the strip enable the strip to be used with doors of varying widths and for non-handed installation.

Abstract: A power door sensing strip incorporates a pair of electrical conductors positioned in a sealed plastic tube and supported in a molded foam block so that external forces result in contact between the conductors. Reliable operation is afforded by the absence of internal supports between the conductors. Further, short circuits caused by moisture and contaminants entering the foam through breaks in an outer jacket are eliminated. Trimmable tails and electrical connections on the ends of the strip enable the strip to be used with doors of varying widths and for non-handed installation.