Appeal No. 1998-1878 Page 10
Application No. 08/543,734
in Fig. 1, will effect a concurrent similar movement of
linkages 15 and 16 to effect a concurrent similar operation of
pumps 17 and 18 thereby effecting a concurrent similar drive
of tracks 20 and 22 by the drive motors 19 and 21 to effect a
selective forward or reverse straight drive of the vehicle.
Alternatively, a movement of the control lever 13 toward the
left or right position, as seen in Fig. 3, effects a
displacement of the corresponding linkage 15 or 16 only,
whereby only one of the pump motors 17 or 18 is
correspondingly operated to effect a corresponding operation
of one or the other of the track drive motors 19 or 21.
Concurrent speed and/or directional adjustments may be made by
lever 13 by both a forward or reverse positioning of the
control lever concurrently with a left or right positioning
thereof (Fig. 4).
Schultz discloses an operating control system for a lift
truck controlled from a single multi-function operator hand
control 62 which controls direction (forward/reverse), speed
and the operation of all hydraulic functions of the truck
related to the handling of loads. The control handle 62 may
be pushed or pulled linearly along the control shaft 60 to
Page: Previous 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Next
Last modified: November 3, 2007