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Block and tackle
Videos
A block and tackle, purchase, or only tackle is a system of two or more pulleys with a rope or cable threaded between them, used to provide tension and lift heavy loads.
A gun tackle has a single pulley in both the fixed and moving blocks with 2 rope parts (n) supporting the load (FB) of 100 N. The mechanical advantage is 2, requiring a force of only 50 N to lift the load.
A gun tackle has a single pulley in both the fixed and moving blocks with 2 rope parts (n) supporting the load (FB) of 100 N. The mechanical advantage
A double tackle has two pulleys in both the fixed and moving blocks with four rope parts (n) supporting the load (FB) of 100 N. The mechanical advanta
A double tackle has two pulleys in both the fixed and moving blocks with four rope parts (n) supporting the load (FB) of 100 N. The mechanical advantage is 4, requiring a force of only 25 N to lift the load.
Wooden block on a sailing ship shows friction.
Wooden block on a sailing ship shows friction.
Three vintage snatch blocks showing the "snatch" closed, opened, and securely moused
Three vintage snatch blocks showing the "snatch" closed, opened, and securely moused
Block (sailing)
Videos
In sailing, a block is a single or multiple pulley. One or a number of sheaves are enclosed in an assembly between cheeks or chocks. In use, a block is fixed to the end of a line, to a spar, or to a s
Block and tackle
…of two or more pulleys with a rope or cable threaded between them, used to provide tension and lift heavy loads. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load. The rope is threaded through the pulleys to provide mechanical advantage…
Several different types of block connections as used on sailing ships, including the regular shackle, upset shackle, reverse shackle, reverse upset sh
Several different types of block connections as used on sailing ships, including the regular shackle, upset shackle, reverse shackle, reverse upset shackle, swivel jaw, swivel eye made round or oval, loose front hook, loose swivel hook, stiff swivel hook, loose side hook, stiff front hook, and side sister hook.
Various types of blocks of both wood and metal found on the 16th century ship Mary Rose
Various types of blocks of both wood and metal found on the 16th century ship Mary Rose
A bird perched near a wooden block
A bird perched near a wooden block
A modern single block made of stainless steel and reinforced plastic. The ball bearing is made of Delrin (polyoxymethylene)
A modern single block made of stainless steel and reinforced plastic. The ball bearing is made of Delrin (polyoxymethylene)