Lift truck with a laterally movable multi-section mast assembly

Claim 1

A LIFT TRUCK HAVING A BODY, FRONT AND REAR WHEELS ON WHICH THE BODY IS CARRIED, AND A MAST MOUNTED ON THE BODY AND COMPRISING A FIRST GUIDE PART FIXED AGAINST MOVEMENT IN AN UP-AND-DOWN DIRECTION, A LIFT JACK SECURED AT ITS LOWER END TO SAID FIRST GUIDE PART AND HAVING GUIDE MEANS AT THE UPPER END THEREOF, A SECOND GUIDE PART GUIDED FOR MOVEMENT ALONG THE FIRST GUIDE PART BETWEEN AND UPPER LIMITING POSITION AND A LOWER LIMITING POSITION DETERMINED BY THE LIMITS OF EXTENSION OF SAID LIFT JACK, A CARRIER FRAME GUIDED FOR MOVEMENT UP AND DOWN THE SECOND GUIDE PART, THE MAST BEING MOUNTED ON THE BODY FOR SLEWING RELATIVE TO THE BODY ABOUT A FIXED AXIS TO BRING THE CARRIER FRAME INTO A LATERALLY FACING POSITION AND INTO A FORWARD-FACING POSITION, SAID LIFT JACK HAVING ITS UPPER END GUIDED AND MOVABLE UPWARDLY INTO AND DOWNWARDLY OUT OF ABUTTING ENGAGEMENT WITH THE SECOND GUIDE PART FOR PROVIDING A LOST MOTION CONNECTION BETWEEN THE UPPER END OF THE JACK AND THE SECOND GUIDE PART, FLEXIBLE TIE MEMBERS ANCHORED AT ONE END TO THE FIRST GUIDE PART, EXTENDING OVER THE GUIDE MEANS CARRIED BY THE UPPER END OF THE JACK AND SECURED AT THE OTHER END TO THE CARRIER FRAME, AND STOP MEANS ON SAID LIFT TRUCK FOR PREVENTING DOWNWARD MOVEMENT OF THE SECOND GUIDE PART BEYOND A PREDETERMINED LEVEL WHEN THE CARRIER FRAME IS IN SAID LATERALLY FACING POSITION, WHICH LEVEL IS HIGHER THAN SAID LOWER LIMITING POSITION, WHEREBY FURTHER LOWERING MOVEMENT OF THE JACK AFTER THE SECOND GUIDE PART COMES INTO ENGAGEMENT WITH THE STOP MEANS LOWERS THE CARRIER FRAME FURTHER BY VIRTUE OF THE LOST MOTION CONNECTION.