What is Sampson post on drilling rig?

The Sampson post, also known as a Sampson's post, is a vertical support structure on a drilling rig designed to hold and guide the drilling line. It typically features a sheave or pulley at the top that helps redirect the drilling line from the hoisting system to the drilling apparatus. This component is crucial for managing the movement of the drill string and ensuring safe and efficient drilling operations. Its design allows for the handling of heavy loads and provides stability during drilling activities.