Lift truck mast and carriage assembly

B - Operations – Transporting – 60 – P

Patent

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214/12

B60P 1/00 (2006.01) B66F 9/08 (2006.01)

Patent

CA 1187049

Abstract of the Invention A power-up and power-down mast and carriage assembly for a lift truck of the type having a stationary mast section fixed to the truck, a movable inner mast section reciprocable within the stationary mast, a fork carriage movably associated with the inner mast section, a double-acting hydraulic ram having an extensible and retractable cylinder and piston rod assembly operatively connected between said mast sections for extending and retracting the inner mast section relative to the stationary mast section. Lost-motion couplings interconnect both power-up and power-down chains with the stationary mast and carriage in a closed loop chain rigging system. The lost-motion couplings each have a rod slidably through the inter- connection with the carriage and stationary mast, and spaced stops operable to limit travel of the rod to a predetermined distance. Coil springs connected to the rod yieldably bias the chains so as to exert tension thereon in a direction opposite to the load forces imposed on the chains by the ram. The lost-motion predetermined travel distance preferably is equal to the sum of the travel of the lost-motion coupling of the powered chains during initial application of ram-applied forces thereto plus the maximum elongation of the powered chains under maximum rated load so that the non-powered chains are always maintained in taut condition in both power-up and power-down modes of operation of said mast. 23.

418930

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