Abstract: A fluid pump comprising a plurality of piston cylinders (1, 2, 3, 4), wherein each individual cylinder has a piston rod (5, 6, 7, 8) with a piston (9, 10, 11, 12) arranged in the cylinder and a valve housing (13, 14, 15, 16) mounted at the end of the cylinder opposite the piston rod, and a drive arrangement for the piston rods, said drive arrangement comprising two main gearwheels (17, 18) which mesh and rotate in opposite directions. The present fluid pump is characterized in that the reciprocating motion of the piston rods (5, 6, 7, 8), which extend in pairs in opposite directions, is effected with the aid of two beams (19, 20) that are fixed to the end of the respective pair of piston rods opposite the pistons (9, 10, 11, 12), and which extend at right angles relative to the piston rods, and that the beams are connected to the main gearwheels (17 18) by shaft pins (21, 22, 22, 23) which move in pairs in guides (24) provided in the longitudinal direction of the respective beam.

Abstract: A piston pump assembly having a single drive gear assembly associated with two adjacent pump cylinders. Each pump cylinder has a separate valve unit associated therewith. The two pump cylinders have a common piston rod having a pump piston arranged at each end. The piston pod is formed as a toothed rack and the drive gear assembly includes motor-driven gearwheels engaged with the toothed rack.

Abstract: A rotary table for a drill string, including a stationary frame having a rotating part arranged therein, and hydraulic equipment such as hydraulic slips (wedge-shaped holding collars) and a hydraulic clamp on the rotating part, and also hydraulic power transmission between the stationary part and the rotating part. The hydraulic power transmission for each individual piece of hydraulic equipment includes a hydraulic motor (29, 30, 31) in the stationary frame (2), a hydraulic pump (17, 18, 19) in the rotating part (3), and a ring (11, 12, 13) provided with internal and external toothing, wherein the internal toothing is in driving engagement with a gearwheel (20, 21, 22) on an input shaft in the hydraulic pump and the external toothing is in driving engagement with a gearwheel (20, 21, 22) on an input shaft in the hydraulic pump and the external toothing is arranged for engageable and disengageable driving interaction with a gearwheel (24, 25, 26) on an output shaft in the hydraulic motor.

Abstract: A derrick, especially a drilling rig derrick, including a derrick structure and lifting tackle for a load, for example, a drill string, in the derrick structure.

Abstract: An apparatus for preventing pipe buckling when downwardly directed axial forces are applied to a pipeline (3) which extends from a derrick (1) down into a well bore, especially when snubbing. The apparatus comprises two sets of pipe supports (8) linked together to give a continuous chain (10), which is arranged to extend from a respective guide rail (6, 7) in the derrick (1) to the pipeline (3), and the pipe supports (8) are movably arranged in the guide rail (6, 7) parallel to the pipeline (3). The guide rail (6, 7) extends in a general U-shape with the U-bend (6c, 7c) located closest to the lower end of the derrick (1) and comprises two legs (6a, 6b, 7a, 7b), of which a first leg (6a, 7a) is arranged close to the pipeline (3) and a second leg (6b, 7b) is arranged at a greater distance from the pipeline. The pipe supports (8) are designed to be placed in the first leg (6a, 7a) when operative, and are designed to be transferred to the second leg (6b, 7b) when they are to be rendered inoperative.

Abstract: A drill floor hole comprising a through-going vertical opening in a drill floor. A pipe holder is mounted so as to be capable of vertical movement below the opening. The pipe holder is suspended in a pulley loop in a wire drive wherein a wire is attached to the drill floor, runs down and over the pulley loop and passes up to a winch.