The component units of a deck winch (fig. 3-36)
are a drum (12), a ratchet (13), a locking pawl (14),
a base (11), and a cover (10). The base is bolted to
the deck and provides a hub for the drum and a pin
on which is mounted the locking pawl.
The spring-loaded locking pawl is rotated
around its pin by means of the pawl handle (15) and
is used to hold or release the ratchet. The drum
moves on bushings, around the rotation point in the
base, by means of the drum handle (9), which is
pinned to the cap and bolted to the body of the
drum. Once the pawl is released, the drum is
turned manually with the handle to tension or
slacken the lower loading strap tensioning pendant.
TENSIONING PENDANTS
Tensioning pendants provide the link between
the winches and loading straps to keep the straps or
cables in the correct position when a barricade is
rigged.
STANCHION HYDRAULIC CYLINDER
The hydraulic cylinder (fig. 3-37) raises and
lowers the barricade stanchion when hydraulic fluid
under pressure is introduced into the cylinder on
either the raising side of the piston or the lowering
side of the piston. A front cap (3) and a rear cap
(4) are each attached to the cylinder ends by bolts
and sealed by an O-ring (13) and backup rings.
Contained in the cylinder (2) are a piston (l), a
piston rod (5), and two plungers (6), one on each
side of the piston. The piston and plungers are held
in position on the rod by a castellated nut and
secured by a cotter pin. The piston and piston rod
are sealed by an O-ring (13) and backup rings. The
piston is fitted with two packing followers, two sets
of V-ring packings (12), four rings each, and two
piston glands (11) secured by bolts, each safety
wired. Shims (14) are provided between the piston
face and piston gland to obtain the proper packing
float. The piston rod is sealed where it extends
through the front cap (3) by four V-ring packings
(12), a spacer, and piston rod gland (10) secured by
bolts and washers.
Shims (14) are provided to
obtain proper packing float. A terminal is attached
to the end of the piston rod and is secured by a
setscrew.
The front cap and rear face are each
fitted with a tailpiece, an adapter, an orifice plate,
a union nut, and an elbow to attach hose; joints are
sealed by O-rings and packing.
A vent valve
assembly (8) and plug (9) are located at each end of
the hydraulic cylinder to vent air or drain fluid.
COUNTERBALANCING SPRING
The counterbalancing spring supplements the
force of the stanchion cylinder in raising the
stanchion, and cushions the contact of the stanchion
with the deck.
The counterbalancing spring (fig. 3-38) is a
group of three compression spring units (5)
comprising five individual springs (4) each. It is
1. Equalizing plate
4. Spring
2. Clevis
5. Counterbalancing spring unit
3. Rod
Figure 3-38.—Counterbalancing spring assembly.
3-41
6. Terminal
7. Cable
