Automatic door safety system
First Claim
1. An automatic door structure having doorway comprising a door mounted for movement in said doorway, a plurality of stationary and moving object presence sensing detectors arranged to produce stationary and moving object presence sensing beams in overlapping relation to one another such that the beams, in alignment, fully span the doorway along the path of movement of the door and extend at least a predetermined distance on each side of the doorway, power means for actuating the door, and means arranged on the door operative upon movement of the door to open position to successively switch on each detector as it passes along its path to open position and effective upon reverse movement of the door to closed position to successively shut off each detector.
0 Assignments
0 Petitions
Accused Products
Abstract
Mechanism primarily suited to automatic sliding door applications wherein at least a pair of object presence sensing detectors, preferably of the ultra-sonic transducer type are arranged to be placed in linear spaced relation to one another effective to cast sonic beams produced thereby spanning the doorway to which applied. So as to assure satisfactorily a beam path to be intercepted by an object stationary or moving in the beams, they are purposely overlapped. The door upon being operatively moved by motion sensing detectors or manual means acts at different opening positions to switch the object sensing detectors on and upon reverse closing positions switches the object sensing detectors off.
-
Citations
18 Claims
- 1. An automatic door structure having doorway comprising a door mounted for movement in said doorway, a plurality of stationary and moving object presence sensing detectors arranged to produce stationary and moving object presence sensing beams in overlapping relation to one another such that the beams, in alignment, fully span the doorway along the path of movement of the door and extend at least a predetermined distance on each side of the doorway, power means for actuating the door, and means arranged on the door operative upon movement of the door to open position to successively switch on each detector as it passes along its path to open position and effective upon reverse movement of the door to closed position to successively shut off each detector.
- 9. Mechanism for an automatic sliding door capable of moving to open position and closed position, said mechanism having power means for moving said door from closed to open position from a closed position and reversing the movement from open position to closed position comprising at least two stationary and moving object presence sensing detectors arranged above the door and spaced from one another in alignment with one another along the path of movement of the door for projecting overlapping stationary and moving object presencesensing beams along and in the path of movement of the door and capable when in beam producing operation of detecting the presence of any object either stationary or moving in the doorway of the door and the door has means effective upon opening movement of the door to engage and turn the detectors on in successive relation to one another and upon door closing motion to successively turn off the detectors.
- 16. An automatic door structure having a doorway comprising a door adapted to be mounted for sliding movement in the doorway, at least one presence sensing detector arranged directly above the path of movement of the door to produce a stationary and moving object presence sensing beam extending vertically downwardly to a predetermined limited distance from the floor of the doorway and spanning the doorway in and along the full path of movement of the door and extending a predetermined distance on each side of the doorway, power means for actuating the door, means for initiating operation of the power means effective to move the door to open position and to turn on the detector for stationary and moving object presence sensing beam operation.
Specification