Appeal No. 1998-1878 Page 7
Application No. 08/543,734
or pull motion in a second “Y” direction corresponding to the
direction the operator is facing;
(B) powered means for propelling the powered lift truck
in either the forward or reverse direction at variable speeds;
(C) a mast on the lift truck having a lifting and
lowering capability;
(D) a multi-function single-lever operator hand control
in the operator’s compartment having a neutral position and
two directions of motion comprising (1) a first pivot axis
perpendicular to the “X” direction of the operator’s
compartment about which the single-lever operator hand control
pivots using the first muscle group, and (2) a second pivot
axis perpendicular to the “Y” direction of the operator’s
compartment about which the single-lever operator hand control
pivots using the second muscle group; and
(E) control means responsive to displacement of the
single-lever operator hand control in either “X” or “Y”
direction from the neutral position against an ergonomical
reaction force acting in the “X” direction which is
substantially lighter than an ergonomical reaction force
acting in the “Y” direction such that the operator’s first
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