Casing tong assembly

摘要

An adjustable casing tong apparatus with a pivoting arm for disconnecting sections of drill string pipe in a drilling apparatus so that the casing tong can match the angle of the drill pipe used during angle drilling. A support column is connected to the deck of the drilling apparatus and an arm member is supported by the support column for movement in a direction along the longitudinal axis of the support column and is also rotatably connected to the column. A wrist member is pivotally and rotatably connected to the arm member and adjustable therewith by a pin indexing arrangement. A bracket hand is also pivotally connected to the wrist member. By suitable longitudinal adjustment of the arm member on the support column as well as the pin indexing arrangement between the wrist member and the arm member as well as rotation of the wrist member, the casing tong can suitably match the angle of the drill pipe used when angle hole as well as vertical drilling on a blast hole drill.