TORQUE STABILIZATION FOR A RIG MAST

摘要

A rig mast torque stabilization system has a racking board extending rearward from a middle portion of a vertical mast. Right and left braces are movable from a transport position to an operating position extending laterally outward from the mast. Right and left mast tethers are each connected to the corresponding brace, and to the mast above the brace. Right and left board tethers are each connected to the corresponding brace, and to the racking board. Right and left vehicle tethers are each connected to the corresponding brace, and to a forward location on the vehicle supporting the mast. The mast tethers, board tethers, and vehicle tethers are configured to be in tension when the racking board is in the board operating position, the mast is in the mast operating position, and the braces are in the brace operating position.

主权项

1. A rig mast torque stabilization system comprising:
a mast pivotally mounted on a vehicle for transport, the mast movable from a substantially horizontal mast transport position to a substantially vertical mast operating position extending upward from a rear end of the vehicle; a racking board extending, when in a board operating position, rearward from a vertical location in a middle portion of the mast when the mast is in the mast operating position; right and left elongated braces movably attached to corresponding right and left sides of the middle portion of the mast, the braces movable from a brace transport position where outer ends of the braces are in proximity to the mast, to a brace operating position where the braces extend laterally outward from corresponding right and left sides of the mast to the outer ends of the braces; right and left mast tethers, each mast tether connected at a lower end thereof to the corresponding right and left brace, and each mast tether connected at an upper end thereof to the mast at a location above the corresponding right and left brace, the mast tethers configured to be in tension when the racking board is in the board operating position, the mast is in the mast operating position, and the braces are in the brace operating position; right and left board tethers, each board tether connected at an outer end thereof to an outer end of the corresponding right and left brace, and each board tether connected at an inner end thereof to the racking board, the board tethers configured to be in tension when the racking board is in the board operating position, the mast is in the mast operating position, and the braces are in the brace operating position; right and left vehicle tethers, each vehicle tether connected at an upper end thereof to the corresponding right and left brace, and each vehicle tether connected at a lower end thereof to a forward location on the vehicle, the vehicle tethers configured to be in tension when the racking board is in the board operating position, the mast is in the mast operating position, and the braces are in the brace operating position.