Movable or removable closures – Time controlled
Patent
1985-07-08
1986-09-30
Downey, Kenneth
Movable or removable closures
Time controlled
49 31, 49264, 49 28, E05F 1520
Patent
active
046140573
ABSTRACT:
An automatic mat-activated operating system for swinging doors provides approach circuitry for opening the doors when an approach mat at the entrance side of the doorway is activated and override safety circuitry for stopping door opening movement and returning the doors to a closed position when a safety mat at the exit side of the doorway is activated within a predetermined initial range of door movement but not thereafter and also for preventing door opening movement if the safety mat is already activated at the time of initial activation of the approach mat. The control system thus protects pedestrians at the exit side of the doorway from being struck by the doors during their initial opening movement which may not be readily recognizable and avoidable and also protects pedestrians entering the doorway from the entrance side from being struck by unexpected return movement of the doors.
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patent: 4476678 (1984-10-01), Hall
Downey Kenneth
Keane Monroe Corporation
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