Pipe handling apparatus for oil well drilling derrick

Details Pipe handling apparatus for oil well drilling derrick Pipe handling apparatus for oil well drilling derrick

E - Fixed Constructions

21

B

255/14.3

E21B 19/14 (2006.01)

Patent

CA 1044218

PIPE HANDLING APPARATUS FOR OIL WELL DRILLING DERRICK Abstract of the Disclosure The inner end of a boom is pivotally supported on a horizontal axis in front of a well, over which there is an oil well drilling derrick. Pivotally connected to the outer end of the boom on an axis parallel to the axis just mentioned, is clamping means for gripping drill pipe connected at one end to elevators in the derrick. The clamping means allows the free end of the drill pipe to swing across the boom as the outer end of the boom is raised or lowered. L?ne means connect- ed at one end with the traveling block that raises and lowers the elevators and at the other end to the boom pass around sheaves mounted in the derrick. Also connected with the boom is a counterweight for swinging it in one direction in a vertical plane when the traveling block moves in the same direction as the boom. The sheaves are so positioned that when the traveling block moves in the opposite direction the line means will pull the boom in that direction. Means are provided for keeping tension on the line means at all times.

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