Power file safety construction

Claim 1

SAFETY CONSTRUCTION FOR A POWER FILE OF A TYPE IN WHICH A PLURALITY OF PANS ARE MOUNTED ON AN ENDLESS CONVEYER MECHANISM FOR MOVEMENT IN EITHER DIRECTION IN A CONTINUOUS ORBIT OF TRAVEL AND ANY SELECTED PAN IS DELIVERED BY CONVEYER DRIVE POWER MEANS AT A WORK STATION, AND IN WHICH A DRAWER WHICH MAY BE LATCHED IN RETRACTED POSITION IS SUPPORTED ON EACH PAN AS A PAN-DRAWER ASSEMBLY ON SUSPENSION MECHANISM WHICH PERMITS THE DRAWER TO BE MOVED BETWEEN RETRACTED AND EXTENDED POSITIONS THROUGH A FILE ACCESS OPENING PROVIDED IN THE FILE CASE AT THE WORK STATION; INCLUDING DRAWER LATCH MECHANISM MOUNTED ON EACH PAN-DRAWER ASSEMBLY; SAFETY ACTUATOR ROD MEANS OPERATIVELY CONNECTED WITH THE LATCH MECHANISM MOUNTED ON EACH PAN-DRAWER ASSEMBLY MOVABLE FROM RETRACTED TO EXTENDED POSITION UPON UNLATCHING THE LATCH MECHANISM FOR SUCH PAN-DRAWER ASSEMBLY; THE SAFETY ROD MEANS FOR EACH PAN-DRAWER ASSEMBLY WHEN IN EXTENDED POSITION BEING LOCATED IN A ZONE AT ONE END OF THE PAN-DRAWER ASSEMBLIES PARALLEL WITH THE PATH OF TRAVEL OF THE FILE CONVEYER MECHANISM; TRIP-BAR MEANS MOUNTED FOR MOVEMENT ON THE FILE BETWEEN NORMAL AND ACTUATED POSITIONS ADJACENT THE WORK STATION ACCESS OPENING AND EXTENDING PARALLEL WITH THE PATH TRANSVERSED IN SAID ZONE BY SAID SAFETY ROD MEANS DURING MOVEMENT OF THE CONVEYER PAST SAID ACCESS OPENING; SAID TRIP-BAR MEANS BEING SPRING-BIASED TO NORMAL POSITION AND WHEN IN NORMAL POSITION BEING ADAPTED TO BE ENGAGED AND MOVED TO ACTUATED POSITION UPON MOVEMENT TO EXTENDED POSITION OF THE SAFETY ROD MEANS OF ANY PAN-DRAWER ASSEMBLY WHEN THE LATTER IS LOCATED AT AN ACCESSIBLE POSITION AT THE WORK STATION; A SINGLE SAFETY SWITCH MEANS MOUNTED ADJACENT THE TRIP-BAR MEANS AND HELD IN NORMALLY CLOSED POSITION BY SAID TRIP-BAR MEANS WHEN THE LATTER IS IN NORMAL POSITION; SAID SAFETY SWITCH MEANS BEING RELEASED BY SAID TRIP-BAR MEANS TO OPEN WHENEVER THE TRIP-BAR MEANS IS MOVED FROM NORMAL TO ACTUATED POSITION; AND ELECTRICAL CONTROL CIRCUITRY CONNECTING SAID SAFETY SWITCH MEANS AND THE CONVEYER DRIVE POWER MEANS; WHEREBY WHEN ANY DRAWER LOCATED AT AN ACCESSIBLE POSITION AT THE WORK STATION IS UNLATCHED, OPENING OF SAID SWITCH BY THE EXTENDED SAFETY ROD MEANS AND ACTUATED TRIP-BAR MEANS PREVENTS OPERATION OF THE CONVEYER DRIVE POWER MEANS.