3.3
Functional Sequence
For the purpose of describing the functional sequence, plea-
se assume that the
CargoMaster
is in the position “moving
on level ground.” More precisely, the moving gear and the
frame are in such a position to each other that one can easi-
ly drive on level ground. This starting position of the
Cargo-
Master
is called 0°. The lifting levers are in an approximately
horizontal position as shown in Figure 3. The rotating axis of
the lifting levers and the axles of the big wheels are on about
the same level.
The First Phase
Drive the
CargoMaster
to the first step of the stairs in the
position 0°. Push the up/down switch to “UP” and the motor
begins to rotate.
The motor shaft can rotate freely in the big wheels and, sin-
ce the lifting levers are connected with the motor shaft, the
lifting levers rotate around the axis of the big wheels, which,
in turn, inevitably lifts the frame.
The rotation moves from 0°
to 45° and at position 90°
one can see that the lifting
levers lifted the frame into
its highest possible positi-
on. The small supporting
wheels climbed along and
touch down on the next
step at approximately 135°
(see Figure 4). This conclu-
des the first phase.
The Second Phase
Once the supporting wheels touched down on the step, the
big wheels are moved up to the same step passing the posi-
tions 180° and 225° (see Figure 5).
At roughly 270° the big
wheels reach their hig-
hest possible position
and at about 315° they
take over the load of the
small supporting wheels.
In the meantime one pulls
the
CargoMaster
back to
the edge of the following
step. The final position
360° coincides with the
starting
position
0°,
which concludes the se-
cond phase and the pro-
cess can be repeated.
CargoMaster
A130
GB
7/98
FIGURE 3
180°
225°
270°
315°
360°
FIGURE 5
45°
0°
90°
135°
FIGURE 4
