Conveyor system control apparatus

Claim 1

A STOP MECHANISM FOR USE WITH A CONVEYOR OF THE TYPE IN WHICH ARTICLE CARRYING RACKS ARE MOVED BETWEEN STATIONS, MEANS MOUNTING SAID STOP MECHANISM ADJACENT TO THE CONVEYOR IN A POSITION TO ENABLE THE MECHANISM TO SELECTIVELY INHIBIT THE PROGRESS OF THE RACKS CARRIED BY THE CONVEYOR, SAID STOP MECHANISM COMPRISING A STOP MEMBER MOVABLE BETWEEN PASS AND STOP POSITIONS, MEANS BIASING THE STOP MEMBER TO A PASS POSITION, FIRST AND SECOND LATCH MEANS FOR INHIBITING MOVEMENT OF THE STOP MEMBER INTO THE PASS POSITION, MEANS FOR BIASING THE STOP MEMBER INTO ENGAGEMENT WITH THE FIRST LATCH MEANS, MEANS MOUNTING SAID STOP MEMBER FOR MOVEMENT, IN RESPONSE TO ENGAGEMENT THERETO BY A RACK, OUT OF ENGAGEMENT WITH THE FIRST LATCH MEANS AND INTO ENGAGEMENT WITHTHE SECOND LATCH MEANS, SAID LATCH MEANS BEING SO LOCATED WITH RESPECT TO EACH OTHER THAT UPON REMOVAL OF THE RACK FROM ENGAGEMENT WITH THE STOP MEMBER, THE LAST NAMED BIASING MEANS MOVES THE STOP MEMBER OUT OF ENGAGEMENT WITH THE SECOND NAMED LATCH MEANS INTO A POSITION IN WHICH THE FIRST NAMED BIASING MEANS MOVES THE STOP MEMBER INTO A PASS POSITION, AND MEANS FOR RETURNING THE STOP MEMBER INTO STOP POSITION IN ENGAGEMENT WITH THE FIRST LATCH MEANS.