Control mechanism for conveyor track switch

Claim 1

SWITCH TONGUE POSITION CONTROL MECHANISM FOR A CONVEYOR CARRIER TRACK SYSTEM HAVING A SWITCH TONGUE PIVOTED AT THE INTERSECTION OF MAIN AND BRANCH LINES AND HELD BY A LATCH DEVICE IN MAIN LINE POSITION AGAINST THE FORCE OF A SHIFTER SPRING WHICH ACTS TO MOVE THE TONGUE TO BRANCH LINE POSITION WHEN THE LATCH IS RELEASED, CHARACTERIZED BY THE TONGUE POSITION CONTROL MECHANISM INCLUDING A RESETTING MEMBER PIVOTALLY SECURED TO THE SWITCH TONGUE, A ONE-WAY DRIVING ABUTMENT BETWEEN THE SWITCH TONGUE AND RESETTING MEMBER AND ENGAGEABLE BY THE LATTER, MEANS CONNECTING THE SHIFTER SPRING TO THE RESETTING MEMBER WHEREBY THE RESETTING MEMBER IS NORMALLY URGED INTO ENGAGEMENT WITH THE ONE-WAY DRIVING ABUTMENT AND THE SWITCH TONGUE THEREBY NORMALLY URGED TO BRANCH LINE POSITION, THE RESETTING MEMBER BEING PROVIDED WITH FIRST AND SECOND CAM SURFACES ENGAGEABLE IN SUCCESSION BY A PASSING CARRIER WHEN THE SWITCH TONGUE IS IN BRANCH LINE POSITION, THE FIRST OF THESE CAM SURFACES BEING DISPOSED IN RELATION TO THE RESETTING MEMBER PIVOT TO CAUSE THE RESETTING MEMBER TO BE URGED INTO ENGAGEMENT WITH THE ONEWAY DRIVING ABUTMENT TO PRODUCE MOVEMENT OF THE SWITCH TONGUE TO MAIN LINE POSITION WHEN THE FIRST CAM SURFACE IS ENGAGED BY A PASSING CARRIER, THE SECOND RESETTING MEMBER CAM SURFACE BEING ADAPTED TO PRODUCE REVERSE PIVOTAL MOVEMENT OF THE RESETTING MEMBER TO A LATCHING POSITION IN RESPONSE TO ENGAGEMENT OF THE SECOND CAM SURFACE BY A PASSING CARRIER, AND A LATCH ELEMENT CARRIED BY THE RESETTING MEMBER, SAID LATCH ELEMENT BEING ENGAGEABLE BY THE LATCH DEVICE WHEN THE RESETTING MEMBER IS MOVED TO A LATCHING POSITION.