Arrangement for controlling the flow of people in the entrance of an airraid or other shelter

Claim 1

AN ARRANGEMENT FOR CONTROLLING THE FLOW OF PEOPLE BOUNDARY WALLS DEFINING A PASSAGE TO SAID ENTRANCE; A SWINGABLE DOOR INCLUDING AT LEAST ONE LEAF MOUNTED ON ONE OF SAID BOUNDARY WALLS AND MOVABLE BETWEEN A CLOSED POSITION BLOCKING THE PASSAGE AND INCLUDING A GIVEN ANGLE WITH ONE OF SAID WALLS AND A PLURALITY OF POSITIONS IN EACH OF WHICH SAID ONE LEAF INCLUDES WITH SAID ONE WALL AN ANGLE SMALLER THAN THAT GIVEN ANGLE AND DEFINES AN OPENING GAP INCREASING AS SAID ANGLE DECREASES; AT LEAST ONE GUIDE MEANS EXTENDING ALONG SAID ONE WALL; MEANS GUIDING THE EDGE OF SAID LEAF REMOTE FROM SAID OPENING GAP SHIFTABLE ALONG SAID GUIDE MEANS AND SWINGABLE ABOUT SAID EDGE IN SUCH OF; AT LEAST ONE SUPPORTING LEVER PIVOTALLY CONNECTED AT ONE END THEREOF TO THE OTHER EDGE OF SAID LEAF AND PIVOTALLY CONNECTED AT THE OTHER END THEREOF TO A FIXED PIVOT AT SAID ONE WALL AT A LOCATION NEARER TO SAID ENTRANCE THAN SAID OTHER EDGE OF SAID LEAF; AND MOVING MEANS COOPERATING WITH SAID LEAF FOR FORCEABLY MOVING THE LATTER BEA MANNER THAT SAID ONE EDGE IS IN SAID CLOSED POSITION NEARER TO SAID ENTRANCE THAN IN THE OTHER POSITIONS THERETO AN ENTRANCE COMPRISING, IN COMBINATION, TWO FIXED TWEEN SAID POSITIONS THEREOF.