CMC Rescue, Inc.
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A Z VORTEX User’s Manual
8
Anchoring the AZ VORTEX
It is important to remember that the
AZ VORTEX must be secured for any
possible unanticipated dynamic event.
This includes
securing the rear easel
leg for compression and tension
.
This leg should not be able to move
forward towards the edge or back away
from the edge. The most secure
method to accomplish this is to anchor
the rear foot to the surface as shown in
Figure 4
.
The timing of a rescue may not allow
anchoring each foot. Connecting the feet
together as shown in
Figure 5
is a standard
practice for conventional tripods and works well
with the AZ VORTEX. For NFPA-certified
configurations, each pair of feet must be
independently hobbled.
With any tripod it is critical to keep the
resultant force vector as close to the center as
possible. This minimizes the horizontal vector
that tends to topple the tripod. Figure 5 also
shows the Working Line (blue) exiting the
manhole and the pulling force positioned as
close to the manhole as safety allows. This
keeps the resultant force centered under the
change of direction pulley. When the Working
Line (red) is pulled from outside of the tripod
base, the resultant force vector will try to topple
the tripod,
Figure 6
.
Figure 4
SAFE
Figure 6
DANGER, UNSAFE!
Figure 5
