Abstract: An elongated, electrically conductive, inwardly protruding hollow channel defining an interior chamber is mounted to the lower edge of a one-piece garage door. Mounted within the chamber is a contact strip extending longitudinally along the channel and disposed below the center line thereof such that deflection interiorly of the wall of the channel upon contact with an obstructing object will cause it to engage the contact strip. The channel is optionally mounted to a base perpendicularly extending away from the plane of the door to provide early warning of a contact with an obstructing object.

Abstract: An electrically insulating base for mounting to the lower edge of a one-piece garage door and formed with an elongated, electrically conductive, inwardly protruding elliptical in cross section hollow symmetrical channel formed with an interior chamber. Mounted within the chamber is an elongated J-shaped strip contact extending longitudinally relative the channel and disposed below the center line thereof such that deflection interiorly of the wall of the channel will cause the wall to engage the strip contact.

Abstract: First and second generally harp shaped guard halves, one being formed with a vertical mounting flange for attachment to the garage door jamb adjacent the hardware to be shrouded and each being formed with co-extensive planar walls projecting along the opposite sides of the hardware and formed with inturned peripheral flanges rounding the top and vertical length thereof for complementally mating together to generally shroud the hardware within such guard apparatus.

Abstract: An automatic radio actuated mechanism for opening and closing panels, such as a garage door, makes use of an electric motor to rotate a specially constructed spiral drive screw and move a traveler along a track, the traveler being connected to the door to pull the door open or push the door shut. Included in the mechanism is a camming arrangement for precisely adjusting the full open and full closed positions by action of an electronic circuit which activates the motor. For reversing the operating direction of door movement in the event such movement should be obstructed, the motor housing is mounted in a manner allowing it when restrained to swing for a limited distance, one way or the other, thereby to actuate a switch in the electronic circuit for reversing movement of the door.

Abstract: A back plate serving as a slide bolt frame is designed to be fastened to a door such as a garage door to position a latch bolt slidably mounted on pivot tabs of the back plate. A cover plate has complementary pivot tabs which engage the latch bolt and pivotally mount the cover plate on the back plate. Both plates are also provided with a pair of locking tabs positioned so that one tab of each pair lies adjacent one tab of the other pair for engagement by the shackle of a padlock. In this way, the cover plate is held in an overlying position protecting the padlock. A transverse projection on the latch bolt has a slot engageable with tabs of each pair thereby to lock the latch bolt in either extended or withdrawn position.

Abstract: A garage door opener includes a radio receiver and a push button each operable to initiate a pulse for effecting a switching device which in turn energizes a latching relay. Operation of the latching relay completes an energizing circuit to the appropriate winding of a reversible motor which moves the door toward an open or closed position. A sensing circuit is operable for effecting the reversal of the latching relay to change the direction of motor operation in the event the door engages an object in its path. A foot switch may also be provided for positively sensing an obstacle and reversing the drive motor. A transmitter may be provided with an impulse circuit to limit the duration of the system actuating signal regardless of how long the transmitter push button is depressed.