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| Number | Title | Issue Date |
| 6860694 | Horizontal pipe handling device A device for handling pipes or stands including a transportation carriage for transport of pipes or stands between a pipe storage and a place for use. The carriage includes picking columns, each having a first picking arm arranged to move substantially vertically. T... | 03/01/2005 |
| 6589343 | Device for application of dope on male threads The invention concerns a device for application of dope on male threads, comprising a swivel motor (3), the swivel motor operating a rotatable top (6), on said top at least one dope application nozzle (7) being arranged. The dope application nozzle (7) is... | 07/08/2003 |
| 6202274 | Arrangement for fastening a piston-cylinder arrangement and method for replacing sealings therein A mounting apparatus for a piston-cylinder arrangement (10,11) in a derrick (1) placed on a drill floor (2), which hydraulic piston-cylinder arrangement (10,11) is adapted to raise and lower a yoke (8) which travels on guide rails (7) in the derrick (1) i... | 03/20/2001 |
| 6148922 | Slip joint A slide joint for a riser between a well and a floating petroleum installation such as an oil platform includes an outer pipe and an inner pipe which are adapted to move telescopically relative to one another to compensate for changes in the distance betw... | 11/21/2000 |
| 6094910 | Apparatus and method for raising and lowering a piston in a piston cylinder arrangement in a derrick Disclosed is an apparatus for a derrick, including hydraulic piston/cylinder arrangements for raising and lowering a yoke travelling on guide rails attached to the derrick. A hydraulic system having different modes of operation is provided for the operati... | 08/01/2000 |
| 6095501 | Stretch compensation in a hoisting system for a derrick An apparatus for a derrick, comprising two or more hydraulic piston-cylinder arrangements (10, 11) for raising and lowering a yoke (8) which travels on guide rails (7) in the derrick (1) itself, where two or more wire lines (13) are strung over sheaves (1... | 08/01/2000 |
| 6032929 | Arrangement in connection with a yoke in a hoisting system for a derrick A hydraulically-operated hoist is disclosed. The hoist includes a plurality of hydraulic piston/cylinder arrangements, each having an upper end. Two guide rails are disposed in parallel with the hydraulic piston/cylinder arrangements. A self-aligning yoke... | 03/07/2000 |
| 5709285 | Brake for a hoisting apparatus A brake for a hoisting apparatus including a hoisting line, a drum for the hoisting line, a hoisting motor and a brake system for braking of the hoisting cable, the brake system consisting of a hydraulic brake and a mechanical brake. The mechanical and th... | 01/20/1998 |
| 5677821 | Method and device for detecting full magnetization of electro-permanent magnets A method and device for detecting full magnetization of an electro-permanent magnet which includes at least one permanent magnet part and at least one coil. Current is passed through the coil over a certain period of time in order to magnetize the electro... | 10/14/1997 |
| 4593773 | Well drilling assembly A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a hollow shaft is coupled, having a threaded end which is adapted for connection to a complemen... | 06/10/1986 |
| 4582133 | Pipe handling assembly A pipe handling assembly in connection with an oil derrick comprises two pivotable and vertically movable arms having a grab head in the form of a U-shaped claw intended for transporting a stand of pipe, a drill collar or the like from the well center to ... | 04/15/1986 |
