Pulley blocks are assemblies that consist of a hook or shackle, swivel, bearing, sheaves, sprockets, pins and frame. They are suspended by a hoisting rope or load chain and are designed for a variety ...
Block: An assemblage of one or more sheaves (pulley ... the handles that power the winches used to hoist and trim the sails. Halyard: A line used to hoist and hold up a sail.
I always enjoyed the guys who had portable contraptions they’d hoist onto our shop’s workbench ... for their variable speed feederhouse drive sheaves to help deal with high operating temperatures.