A screw jack is a device which is used to raise heavy loads by an small effort. It consists of a square threaded screw fitted into an internally threaded collar of a jack. The load W is placed on the screw and the effort Ph is applied horizontally at the end of lever arm L.
Screw Jack With square threads
With one rotation of the lever the weight is lifted through a distance equal to the pitch. In case of multi-threaded screws the actual pitch is np.
From figure when a screw is given one revolution, it will move up by pitch p axially, and horizontally by πdm (dm is the mean diameter of the threads). Therefore, inclination of the threads can be calculated by,
tan α = P / πdm
where α is the helix angle.
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