RIGGING
3. Figure 18 illustrates the most commonly used rigging. A nylon sling is used
to protect the tree when it is used as an anchor, and the metal or synthetic
rope is attached to use the sling. The use of a chain or metal or synthetic rope
is not recommended due to the damage it could cause to the tree.
Anchor Point
WINCH
Nylon Sling
Figure 18
4. Figure 19 illustrates a method of rigging used to obtain a mechanical
advantage. The use of a pulley block will almost double pulling line capacity.
PUU£Y BLOCK
00
Anchor Point
Figure 19
(9)
WINCH
VEHICLE
RIGGING
5. Figure 20 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 metal or synthetic rope to
the anchor point.
Figure 20
PULLEY BLOCK
Equipment such as shackle, hooks, pulley blocks, straps,
etc. should be properly sized and rated and should be
inspected periodically for damage that could reduce their
strength.
(10)
