Abstract: 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.

Abstract: A basic operator's cab can be expanded after assembly to provide a widening thereof as well as an expansion in length or both a widening and length expansion. The operator's cab is generally of a rectangular configuration and is fabricated with a diagonal separation line. The two basic sections are connected by nuts and bolts to allow disassembly and movement thereafter. Depending upon customer preference, these two basic sections can be expanded by placing insert members between the two sections which insert members will afford a widening or a lengthening or a combination of both. The insert members can be secured to the two basic sections by use of removable fasteners such as nuts and bolts which also connect the cab sections. The three-way expansion and insert feature for the operator's cab can be utilized for any type of modular unit which is to be expanded and is most particularly suited for large equipment such as blast hole drills.