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RIGGING
3. Figure 11 illustrates the most commonly used rigging. A nylon
sling is used to protect the tree when it is used as an anchor, and
the wire rope is attached to use the sling. The use of a chain or
wire rope is not recommended due to the damage it could cause
to the tree.
Fig. 11
4. Figure 12 illustrates a method of rigging used to obtain a
mechanical advantage. The use of a pulley block will almost
double pulling line capacity.
Fig. 12
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RIGGING
5. Figure 13 illustrates the use of a pulley block to change the
direction of the pull. Mechanical advantage can be obtained by
attaching a pulley block to the nylon sling with a shackle and
running the wire rope to the anchor point.
Fig. 13
Equipment such as tackle, hooks, pulley blocks,
CAUTION
!
straps, etc., should be properly sized and rated
and should be inspected periodically for damage that could
reduce their strength.
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