Lift truck

Claim 1

A LIFT TRUCK COMPRISING A PAIR OF LATERALLY SPACED PRIMARY UPRIGHTS, A PAIR OF LATERALLY SPACED SECONDARY UPRIGHTS MOUNTED FOR VERTICAL MOVEMENT ON SAID PRIMARY UPRIGHTS, A LOAD CARRIAGE MOUNTED FOR VERTICAL MOVEMENT ON SAID SECONDARY UPRIGHTS, A LIFT RAM HAVING A COLLAPSED LENGTH LESS THAN THE HEIGHT OF SAID UPRIGHTS AND HAVING A CYLINDER AND A PISTON WHICH EXTENDS UPWARDLY FROM SAID CYLINDER, A COLLAR SECURED TO AND SURROUNDING THE LOWER END OF SAID RAM CYLINDER, SAID COLLAR HAVING DIAMETRICALLY OPPOSED SEMICIRCULAR RECESSES FORMED IN THE LOWER EDGE THEREOF, A CROSS BRACE SECURED TO AND EXTENDING BETWEEN SAID PRIMARY UPRIGHTS ADJACENT THE LOWER ENDS OF SAID PRIMARY UPRIGHTS, A U-SHAPED BRACKET WELDED TO SAID CROSS BRACE AND SURROUNDING THE LOWER END OF SAID RAM CYLINDER, AN UPWARDLY EXTENDING BEARING PLATE SECURED TO EACH LEG OF SAID U-SHAPED BRACKET BY MEANS OF BOLTS EXTENDING THROUGH OVERSIZED HOLES WHEREBY SAID PLATES MAY BE ADJUSTED RELATIVELY TO SAID U-SHAPED BRACKET, EACH OF SAID PLATES HAVING AN UPPER SEMICYLINDRICAL SHAPED END WHICH IS RECEIVED IN ONE OF SAID SEMI-CIRCULAR RECESSES IN SAID COLLAR WHEREBY SAID RAM CYLINDER IS SUPPORTED ON SAID UPPER ENDS OF SAID BEARING PLATES FOR PIVOTAL MOVEMENT RELATIVELY TO SAID PRIMARY UPRIGHTS, A FIRST CROSS BRACE SECURED TO AND EXTENDING BETWEEN THE UPPER ENDS OF SAID SECONDARY UPRIGHTS, A SECOND CROSS BRACE SECURED TO AND EXTENDING BETWEEN SAID SECONDARY UPRIGHTS A SUBSTANTIAL DISTANCE BELOW SAID FIRST CROSS BRACE, A VERTICAL BAR OF RECTANGULAR CROSS SECTION SECURED AT ITS UPPER AND LOWER ENDS TO SAID FIRST AND SECOND CROSS BRACES OF SAID SECONDARY UPRIGHTS, A HEADER MEMBER SECURED TO THE UPPER END OF SAID RAM PISTON, A U-SHAPED BEARING MEMBER SECURED TO ONE SIDE OF SAID HEADER MEMBER AND HAVING A RECTANGULAR RECESS SLIDEABLY RECEIVING SAID VERTICAL BAR WHEREBY THE UPPER END OF SAID PISTON IS SUPPORTED AND GUIDED DURING EXTENSION OF SAID PISTON RELATIVELY TO SAID UPRIGHTS, CHAIN SHEAVES MOUNTED FOR ROTATION ON SAID HEADER MEMBER, EACH OF SAID CHAIN SHEAVES HAVING A PAIR OF PARALLEL GROOVES IN THE PERIPHERY THEREOF, CROSS LINK LIFT CHAINS SECURED AT ONE END TO SAID PRIMARY UPRIGHTS, SAID CHAINS EXTENDING UPWARDLY AROUND SAID SHEAVES AND SECURED AT THE OTHER END TO SAID LOAD CARRIAGE, THE LINKS OF SAID LIFT CHAINS BEING SO ORIENTED RELATIVELY TO SAID CHAIN SHEAVES THAT THE PLANES OF SAID LINKS EXTEND AT 45* TO THE AXIS OF ROTATION OF SAID CHAIN SHEAVES AND THE SIDES OF ALTERNATE LINKS ENGAGE IN SAID PARALLEL GROOVES OF SAID CHAIN SHEAVES AS SAID LINKS PASSOVER SAID CHAIN SHEAVES.