Lift truck

Claim 1

LOAD LIFTING MECHANISM OF THE CHARACTER DESCRIBED COMPRISING A BASE, A PAIR OF LATERALLY SPACED APART STATIONARY UPRIGHTS SECURED TO SAID BASE, A PAIR OF LATERALLY SPACED APART EXTENSIBLE UPRIGHTS ASSOCIATED WITH SAID STATIONARY UPRIGHTS AND MOVABLE LONGITUDINALLY THEREOF, SAID EXTENSIBLE UPRIGHTS HAVING A PORTION THEREOF PROJECTING FORWARDLY OF SAID STATIONARY UPRIGHTS, A LOAD CARRIAGE, ROLLER MEANS COMPRISING UPPER AND LOWER GUIDE ROLLERS ON SAID LOAD-CARRIAGE AT ONE SIDE OF SAID EXTENSIBLE UPRIGHTS AND IN FORWARD AND LATERAL ENGAGEMENT THEREWITH FOR GUIDING SAID CARRIAGE LONGITUDINALLY OF SAID EXTENSIBLE UPRIGHTS, MEANS POSITIONED ON SAID LOAD CARRIAGE LATERALLY TO THE OTHER SIDE OF SAID EXTENSIBLE UPRIGHTS BUT IN LATERAL ENGAGEMENT WITH THE FORWARDLY PROJECTING PORTION THEREOF, SAID LAST NAMED MEANS AND SAID ROLLER MEANS BEING SO CONSTRUCTED AND ARRANGED THAT ANY ECCENTRIC LOADING OF SAID CARRIGE WILL RESULT IN THE SIDE THRUST THEREOF BEING AT LEAST PRIMARILY IMPOSED ON THE EXTENSIBLE UPRIGHT ADJACENT THE MINOR PORTION OF THE LOAD, AND IN THE FORWARD THRUST THEREOF BEING AT LEAST PRIMARILY IMPOSED UPON THE EXTENSIBLE UPRIGHT ADJACENT THE MAJOR PORTION OF THE LOAD, AND MEANS FOR MOVING SAID LOAD-CARRIAGE RELATIVE TO SAID EXTENSIBLE UPRIGHTS AND SAID LATTER UPRIGHTS RELATIVE TO SAID STATIONARY UPRIGHTS.