![]() This figure shows the diamond and roller bearing block.Ħ-4. The parts of a metal block are shown in Figure 6-2. The metal block has bolts to hold its cheeks together and a metal shell. Metal blocks have basically the same part as wooden blocks. The entire wooden portion of a block is called the shell it protects the sheave and line.Ħ-3. Line is never passed through the breech of a block except for a small tail line used to keep the block from bouncing on the deck. The breech is the opening between the bottom of the sheave and the block and serves no definite purpose. The opening between the top of the sheave and the block where the line is passed through the block is called the swallow. The front of the block is called its face and the sides of the shell are called cheeks. The becket usually has a thimble to prevent chafing of the line. The strap may continue through the block and form a projection, called the becket, to attach another line. Personnel may suspend the block or apply a load by means of a hook or shackle inserted in the top of the strap. Each block has one or more steel straps which strengthen the block and support the sheave pin. A wooden block, as shown in Figure 6-1, consists of one or more sheaves (pulleys). Section III covers marlinespike seamanship, which is a general term for handling and caring for fiber line and wire rope used aboard ship or in other marine operations.Ħ-2. It details the care and use of wire rope, procedures for computing the safe working load and breaking strength, and inspection and handling. Section II covers elements of wire rope rigging which cargo handlers in a terminal service company must know. Section I of this chapter discusses blocks which are among the most important fittings used aboard ship on the deck, in the engine department, and in other operations.
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