Back to results
US 4,621,452 AGranted
Powered sliding door safety system
OwnerWyman L. Deeginventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerWyman L. Deeginventor
Estimating the term…
A sliding door having a safety light beam which travels with and ahead of a closing door. Interruption of the safety light beam by an object in the path of the closing door activates a door control to stop or reverse the closure of the door. A stationary transmitter projects a beam of pulsed infrared light to a convex mirror mounted on the door. The mirror reflects the projected beam ahead of the closing door in a direction transverse to the direction of closure. In one embodiment a plurality of receiver assemblies with overlapping receiving sectors monitor the door closure path and sense the presence of the moving safety beam. Interruption of the safety light beam is detected in a control unit connected to a unit which controls a motor that moves the door. In another embodiment, plane mirrors positioned on an arm mounted on, and projecting ahead of the door, establish and reflect safety beams to corresponding receiver assemblies.
A safety system for powered sliding doors which close a door opening by using door moving means for slideably moving a leading edge of a door across the door opening to a closed position comprising:
A method for stopping the closure of automatically operated powered sliding doors which close a door opening by using door moving means for slideably moving a leading edge of a door across the door opening to a closed position, comprising the steps of:
Dependencies are inferred from the claim text.