and the twist locks are rotated 90 degrees to the locked position, the spreader is coupled
to the freight container.
GUIDE WHEEL (6). The spreader is equipped with a guide wheel at each of the four corners.
The guide wheels are positioned on the spreader for proper engagement of the spreader
to the cell guides of a ship's container cell when freight containers are being loaded aboard,
or removed from, a ship.
ALIGNMENT ARM POSITIONING ROD (7). When the spring pin is pulled out of the alignment
arm, the positioning rod is used to move the alignment arms from either the up or down
position to the opposite position. The eyebolt on the end of the rod is placed over a capscrew,
installed near the end of each alignment arm, to facilitate movement of the alignment
WIRE ROPE ASSEMBLY (8). A wire rope assembly is connected to the anchor shackles
at each of the four corners of the spreader, The opposite ends of the wire rope assemblies
are attached to the hoisting equipment, and provide a means of lifting and transporting
the spreader singly or when it is coupled to a freight container.
Section III. TECHNICAL PRINCIPLES OF OPERATION
1-11 PRINCIPLES OF OPERATION
The IS0 and Intermodal Freight Container Lifting Spreaders, Model 214LS20 and Model
215LS40, are designed for lifting and transporting 20 and 40 foot freight containers. The
spreaders have an alignment arm on each end and two on each side, to assist the hoisting
equipment operator in positioning the spreader on a freight container. The alignment arms
are secured in both the up and down positions by a spring pin. Once the spreader is in position
on the container, a cable operated twist locking cam is actuated manually to rotate the
four twist locks to the locked position. One of the twist locks has a cam locking rod that
prevents the twist locks from moving out of the locked position while the container is being
lifted and transported. If the container is to be loaded aboard ship, all of the alignment
arms must be raised to the up position. The spring pin for each alignment arm is pulled
to the released position by a manually operated cable, and the alignment arm positioning
rod is used to raise the alignment arms to the up position. The alignment arms are held
securely in the up position by the spring pins. A guide wheel is mounted on each of the
four corners of the spreader, to keep the spreader in alignment as it is being lowered into
the container cell on a ship. When the container is at rest in the desired location, the twist
locking cam is actuated by pulling the cable in the opposite direction. This moves the twist
locks to the unlocked position. The alignment arms are moved to the down position to prepare
the spreader to be coupled to the next freight container. Only three alignment arms are
required for use at one time. Two alignment arms on one side and one on one end is sufficient
for aligning the spreader on a container. However, the choice of which and how many align-
ment arms to be moved to the down position rests with the hoisting equipment operator.