ATD ArboTeamDevice
22
The rope can be wound in a clockwise way with the stopper installed on the right or in an
anticlockwise way with the stopper installed on the left.
The rope must absolutely pass within the rope guides.
The number of turns around the aluminium cylinder brake
must be proportional to the
weight to lower.
the stopper have to be open before the descent always.
Once the tree climber has tied up the section to be removed, the ground operator must:
a. open the stopper
b.make a first turn around the
aluminium cylinder brake
c-recover any rope slack between the knot point above in the tree and the aluminium
cylinder brake
d- make extra turns
if
necessary, according to the size of the piece to be lowered.
e. Choose the rope guide hook best suited to the descent of the piece and insert the rope
inside of it
avoiding excessive friction
f.p
lace the remaining rope neatly behind the ground operator
g. Move to a safe area which offers maximum visibility on the operator and on the piece to
be lowered
h.
wait for
the cut to be made and
the
starting signal
from the tree climber located above.
i. p
roceed to lower the piece controlling the sliding of the rope on the aluminium cylinder
brake gradually decelerating the descent in a
controlled
way . In such a way t
hat the piece
gains
less speed possible.
Caution:
The central rope guide hook can only be used by positioning frontally to the ATD with a
maximum range of 45 degrees to the right and to the left of the hook (figure 13).
the stopper have to be open before the descent always.
Do not block suddenly the piece being lowered
You can produce high loads even with small sized pieces.
