Mechanical Advantage

Figure 13-43.A. Simple tackle; B. Compound tackle.

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure 13-41.—Proof Test/Inspection Sheet. Storage Wire rope slings and associated hardware must be stored either in coils or on reels, hung in the rigging loft, or laid on racks indoors to protect them from corrosive weather and other types of damage, such as kinking or being backed over. Slings are not to be left on the crane at the end of the workday. MECHANICAL, ADVANTAGE The push or pull a human can exert depends on the weight and strength of that individual. To move any load heavier than the amount you can physically move, a mechanical advantage must be used to multiply your power. The most commonly used mechanical devices are block and tackle, chain hoist, and winches. Figure 13-42.—Parts of a fiber line block. BLOCK AND TACKLE A block (fig. 13-42) consists of one or more sheaves fitted in a wood or metal frame supported by a shackle 13-23

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