Appeal No. 1998-1878 Page 8
Application No. 08/543,734
muscle group is ergonomically coordinated to the lighter
reaction force while the second muscle group is ergonomically
coordinated to the larger reaction force in the “Y” direction
whereby the operator can sustain longer periods of operation
minimizing operator fatigue.
Habiger discloses a single lever steering control for
hydraulic drive vehicles, particularly, crawler vehicles
having left and right side crawler tracks, comprising a
manually operable control lever 13 mounted to a support block
23 (Fig. 1) which is rotatable about a lower pivot 24 defining
a horizontal axis 25 to permit the control lever to swing to
the forward and reverse positions, first and second operating
levers 15, 16 movable with the control lever about the axis
for causing selective variable speed forward and rearward
operation of the hydraulic fluid pumps 17, 18 feeding the
hydraulic motor 19, 21 of the respective left and right tracks
20, 22 for selective steering drive of the vehicle 12.
Control lever 13 further includes a pair of output operating
levers 26, 27 (Fig. 3) individually mounted to a pivot 28
defining a horizontal axis 29 substantially orthogonal to axis
25. Levers 26 and 27 are biased upwardly, as seen in Fig. 3,
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Last modified: November 3, 2007