Movable or removable closures – With operator for movably mounted closure – Operator drives closure along guide
Patent
1991-08-23
1993-01-12
Kannan, Philip C.
Movable or removable closures
With operator for movably mounted closure
Operator drives closure along guide
49 25, E05F 1112
Patent
active
051779005
ABSTRACT:
An automatic pet door apparatus includes a frame having a parallel-spaced pair of rigidly connected columns for mounting vertically oriented between wall studs, a lower portion of the frame defining a doorway passage between opposite sides of the walls; a door vertically movable in the frame between closed and open positions; a driver supported by the frame and coupled to the door for lifting the door from the closed position to the open position in response to a motor signal; a radiation transmitter for wearing by the pet and operable for producing a predetermined transmitter signal; a transducer located proximate the frame for producing a transducer signal in response to the transmitter signal when the pet approaches the frame from one side of the wall; and a controller responsive to the transmitter signal for activating the motor signal, whereby the door is raised by the driver, the door opening by sliding within the wall.
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