Appeal No. 1998-1878 Page 4
Application No. 08/543,734
USPQ2d 1089, 1091 (Fed. Cir. 1991) and In re Keller, 642 F.2d
413, 425, 208 USPQ 871, 881 (CCPA 1981).
Claim 6 recites a powered industrial lift truck having:
(A) a stand up operator’s compartment designed to
accommodate an operator standing in the compartment facing
partially sideways in a “Y” direction laterally to the
direction of travel of the lift truck in either forward or
reverse traveling in an “X” direction generally perpendicular
to the “Y” direction;
(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 lift and lower
motion corresponding to a push or pull motion of the
operator’s unsupported arm in the “Y” direction and involving
a first large muscle group for effecting such motion and a
first larger resistive force associated with the push or pull
motion;
(D) a multi-function single-lever operator hand control
having a neutral position and two directions of motion mounted
in the operator’s compartment comprising (1) a first “X”
direction of motion for controlling the direction of travel
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