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(View A) Manual chain hoist; (View B) electric hoist - 12654_124
SAFETY TRAINING - 12654_126

Aviation Storekeeper 3 - Aviation theories and other practices - index
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TIERING TRUCK The tiering truck (fig. 6-12) is an electric-powered forklift truck of the straddle-arm design. The location of the forks on the tiering truck are between two outriggers or straddle arms. The straddle arms extend forward in a plane at floor level parallel to that of the forks to straddle the pallet load. Because the straddle arms have contact with the floor, they support the elevated load and do not require a counterweight. The overall weight of the tiering truck is less than that of a conventional forklift truck of the same rated capacity. The tiering truck is more maneuverable than the standard forklift truck and it can operate in 6-foot aisles. The standard tiering truck for the military services is the electric-powered type. It has a load capacity of 3,000 pounds and a lifting height of 100 to 130 inches. PALLET SLING The pallet sling (fig. 6-13) is used for overhead lifting of palletized loads by a crane or ship’s boom. Normally, a cable is used for the sling, but a line or chain may be used, depending on the weight of material to be lifted. Slings have rigid horizontal supports at the base, usually made of steel bars or pipes. The horizontal support must be strong enough to distribute the load across the entire length. Some slings have movable spreader bars at the top to prevent crushing the load while it is being lifted. HOISTS, PULLEYS, AND DOLLIES Various types of hoists, pulleys, and dollies are available ashore and afloat for moving equipment and supplies. You should familiarize yourself with this equipment and its purpose so that as various situations arise, you can select the proper piece of equipment. Hoists Chain hoists or chain falls provide a convenient and efficient method for hoisting loads by hand. The advantages of chain hoists are that one person can raise a load of several tons. Also, without securing the load, it can remain stationary. One person can carry and operate the manually operated chain hoists (fig. 6-14, view A). They are particularly useful in loading and unloading cargo trucks. They also are convenient for working in small storerooms aboard ship when other mechanized equipment is not available. Figure 6-15.-Blocks and tackles. Some larger storerooms have electrically operated hoists that move along overhead tracks (fig. 6-14, view B). Electric hoists lift their loads by either chain or cable. Other models are pneumatic or air hoists that operate by compressed air. These hoists have the advantages of speed and ease of operation. Block and Tackle A block and tackle is the arrangement of one or more pulleys with rope or cable for pulling or hoisting large or heavy objects. The block and tackle (also called tackle or pulley) is used in the same situations as the chain hoist, except for smaller loads. Figure 6-15 shows the different types of blocks and tackles. It also provides the formula for figuring the amount of power needed to move the weight of the load. Dollies The dolly or dolly truck is a frame mounted on wheels or rollers. Dolly trucks are used for moving or 6-15







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