Protective door reversing means

Claim 1

IN AN ELEVATOR SYSTEM, A FRAME, A PAIR OF CENTERPARTING DOOR SLIDABLE IN SAID FRAME BETWEEN ABUTTING CLOSED LIMITS AND OPPOSING OPEN LIMITS, ELECTRICALLY REVERSIBLE DRIVE MEANS FOR MOVING SAID DOORS IN OPPOSITE DIRECTIONS BETWEEN THEIR RESPECTIVE DOOR AND CLOSED LIMITS, A PARALLELOGRAM MEMBER MOVABLY MOUNTED ON THE FRAME ADJACENT TO SAID DOOR AND EXTENDING BETWEEN THE OPEN LIMITS THEREOF, SAID PARALLELOGRAM MEMBER HAVING A COMPONENT OF MOTION TRANSVERSE TO THE MOTION OF SAID DOORS, A TOUCH-RETRACTIVE FRONT SAFETY EDGE MOVABLY MOUNTED ON EACH OF SAID DOORS, BOTH OF SAID FRONT SAFETY EDGES BEING PROVIDED WITH AN ELEMENT FOR ENGAGING SAID DISPLACING SAID PARALLELOGRAM MEMBER IN RESPONSE TO RETRACTION OF THE EDGE THROUGOUT A RANGE OF CLOSING TRAVEL OF THE RESPECTIVE DOOR FROM ITS OPEN TOWARD ITS CLOSED LIMIT, SWITCH MEANS MOUNTED ON SAID FRAME AND OPERATIVE IN RESPONSE TO DISPLACEMENT OF SAID PARALLELOGRM MEMBER, CIRCUIT MEANS COUPLED BETWEEN SAID ELECTRICALLY REVERSIBLE DRIVE MEANS AND SAID SWITCH MEANS FOR REVERSING SAID DRIVE MEANS WHEN IN THE DOOR CLOSING MODE, AND MEANS FOR PREVENTING SAID ELEMENS FROM ENGAGING SAID PARALLELOGRAM MEMBER NEAR THE CLOSED LIMITS OF SAID DOORS TO ALLOW SAID FRONT SAFETY EDGES TO MEET AND RETRACT UPON CLOSURE OF SAID DOORS WITHOUT PRODUCING A REVERSAL OF SAID DRIVE MEANS.