Automatic entrance having sliding door

Claim 1

IN AN AUTOMATIC ENTRANCE, AN OVERHEAD HORIZONTAL TRACK EXTENDING TRANSVERSELY OF THE ENTRANCE OPENING, A TRANSVERSE FRAME FORMED GENERALLY TO AN INVERTED-L CONFIGURATION TO PROVIDE A HORIZONTAL BAR AT THE TOP AND A VERTICAL BAR RIGIDLY FIXED TO THE HORIZONTAL BAR AND DEPENDING FROM ONE END OF THE LATTER, A CARRIAGE RIDING ON THE TRACK AND HAVING THE HORIZONTAL BAR OF THE FRAME SUSPENDED THEREFROM SO THAT SAID HORIZONTAL BAR UNDERLIES THE TRACK AND THE FRAME SLIDES INTO AND OUT OF THE ENTRANCE OPENING AS THE CARRIAGE MOVES RECIPROCALLY ALONG THE TRACK BETWEEN TWO PRESCRIBED LIMITS OF TRAVEL, A DOOR FOR THE ENTRANCE OPENING HINGED AT ITS UPPER AND LOWER ENDS OF THE FRAME FOR SWING MOVEMENT ABOUT AN AXIS WHICH IS FIXEDLY RELATED TO THE FRAME ADJACENT TO AND APPROXIMATELY PARALLEL WITH THE VERTICAL BAR OF THE FRAME INTO AND OUT OF A NORMAL POSITION COPLANAR WITH THE FRAME BETWEEN SAID NORMAL POSITION AND OPEN POSITIONS PLACING THE DOOR AT APPROXIMATE RIGHT ANGLES THERETO EXTENDING EITHER OUTWARDLY OR INWARDLY, SELECTIVELY, FROM THE HINGE AXIS, THE ACT OF A PERSON PRESSING OUTWARDLY AGAINST THE DOOR IN A CIRCUMSTANCE SUCH AS A PANIC CONDITION AND PERFORMED WHEN THE DOOR OCCUPIES THE ENTRANCE OPENING SUPPLYING SUCH FORCE AS IS NECESSARY TO SWING THE DOOR INTO SAID OUTWARDLY EXTENDING OPEN POSITION, POWER MEANS HAVING OPERATIVE INTERCONNECTION WITH THE FRAME OPERATED AUTOMATICALLY BY THE ACT OF A PERSON ENTERING AND LEAVING AN ESTABLISHED TRAFFIC ZONE INCLUDING SAID ENTRANCE OPENING FOR RESPECTIVELY SLIDING THE FRAME AND DOOR OUT OF AND INTO A POSITION CLOSING SAID OPENING, A STOP MEANS FOR THE DOOR, AND MANUALLY CONTROLLED MEANS FOR MAKING SAID STOP MEANS ACTIVE OR INACTIVE AT WILL, SAID STOP MEANS BEING CHARACTERIZED IN THAT, WHEN MADE ACTIVE AND THE DOOR IS OCCUPYING THE ENTRANCE OPENING, THE DOOR IS FREE TO BE SWUNG BY SAID PANIC-CONDITIONED MANUAL FORCE INTO ITS OUTWARDLY EXTENDING OPEN POSITION BUT IS PRECLUDED FROM BEING SWUNG INTO THE INWARDLY EXTENDING OPEN POSITION AND, WHEN MADE INACTIVE AND THE DOOR IS OCCUPYING THE ENTRANCE OPENING, THE DOOR CAN THEN BE SWUNG INTO THE INWARDLY EXTENDING OPEN POSITION.