Masons have installed a gin pole with a pulley on the top of

Masons have installed a gin pole with a pulley on the top of a three tier scaffold. They intend to use it to pull up 300# precast concrete lintels. The hook used to connect the pulley to the gin pole is rated for a load of 500#. How do the masons make this work?

Solution

Masons can complete this work safely.

Capacity of Pulley is equivalent to load of 500# lintels.

Masons intend to pull load of 300# lintels

capacity of pulley > load to be lifted i.e FOS (factor of safety) is 1.67

Hence its safe to pull 300# precast concrete lintels