Lever lift

Claim 1

IN A TRUCK OF THE CLASS DESCRIBED, A LOAD CARRIAGE, A PAIR OF LEVERS EACH PIVOTED AT ONE END THEREOF TO SAID LOAD CARRIAGE IN SPACED RELATIONSHIP, SAID PAIR OF LEVERS BEING PIVOTED AT THEIR OPPOSITE ENDS TO AN ARM IN THE SAME SPACED RELATIONSHIP TO FORM A PARALLELOGRAM COMPRISING SAID PAIR OF LEVERS, SAID LOAD CARRIAGE AND SAID ARM, MEANS CONNECTED TO SAID LEVERS AND TO SAID TRUCK FOR SWINGING SAID PAIR OF LEVERS VERTICALLY ABOUT THEIR PIVOTS ON SAID ARM WHEREBY TO EFFECT LIFTING AND LOWERING OF SAID LOAD CARRIAGE, A LEVER AND A RAM EACH PIVOTED AT ONE END TO SAID ARM IN SPACED RELATIONSHIP AND PIVOTED AT THEIR OTHER ENDS TO SAID TRUCK IN THE SAME SPACED RELATIONSHIP WHEREBY SAID ARM AND SAID PAIR OF LEVERS MAY MOVE BODILY LONGITUDINALLY OF THE TRUCK BY SWINGING MOVEMENT OF SAID RAM AND LEVER TO PERMIT SAID LOAD CARRIAGE TO BE MOVED IN A SUBSTANTIALLY STRAIGHT LINE VERTICAL PATH DURING VERTICAL SWINGING MOVEMENT OF SAID PAIR OF LEVERS AND WHEREBY OPERATION OF SAID RAM MEANS WILL PIVOT SAID ARM TO TILT SAID LOAD CARRIAGE, AND A CONTROL LINK PIVOTALLY CONNECTED AT ONE END TO ONE OF SAID LEVERS AND PIVOTALLY CONNECTED AT THE OTHER END TO THE TRUCK, SAID CONTROL LINK BEING POSITIONED RELATIVELY TO SAID LEVERS AND SAID TRUCK AND BEING OF A DIMENSION BETWEEN THE CONNECTION THEREOF TO SAID ONE OF SAID PAIR OF LEVERS AND THE CONNECTION THEREOF TO SAID TRUCK THAT IT EFFECTS BODILY MOVEMENT OF SAID LEVERS AND ARM THROUGH SWINGING MOVEMENT OF SAID RAM AND LEVER IN A DIRECTION AND TO A DEGREE THAT SAID LOAD CARRIAGE IS MOVED IN A SUBSTIALLY VERTICAL STRAIGHT-LINE PATH AS SAID PAIR OF LEVERS ARE RAISED AND LOWERED.