3.3
Functional Sequence
For the purpose of describing the functional sequence, please as-
sume 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 easily drive on level ground.
This starting position of the
CargoMaster
is called 0°. The lifting
lever are in an approximately horizontal position as shown on the
picture. 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, since 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 postition. The small
supporting
wheels
climbed
along and touch down on the
next step at approximately
135°. This concludes 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 positions 180°
and 225°.
At
roughly
270°
the
big
wheels reach their highest
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 second phase
and the process can be repea-
ted.
5
CargoMaster
45°
0°
90°
135°
180°
225°
270°
315°
360°
