Multi-roller sheaves are often referred to as what type of sheaves?

Multi-roller sheaves are commonly referred to as hook sheaves because they are specifically designed to accommodate multiple lines or ropes and facilitate the smooth operation of hoisting and lifting equipment. The design includes several rollers, which reduce friction and wear on the rope while also distributing the load more evenly. This makes them particularly advantageous for heavy loads or applications requiring precise control over the movement of the cable or rope.

The naming convention highlights their function, as the hook sheave typically includes a hook mechanism to securely connect to the lifting equipment. Their primary role in a block and tackle system, or similar setups, is to guide and support the rope, enhancing effectiveness in lifting and lowering operations. This makes the term "hook sheaves" appropriate since it emphasizes both the mechanical advantage they provide and their connection to hoisting systems.