Abstract: Construction or worksite machines and related apparatus for use on such machines in various examples have at least one hydraulic cylinder for operating a lift/lower element; at least one hydraulic pump that has at least one electric motor coupled thereto for operating the hydraulic pump, the pump being configured for pumping hydraulic fluid along a flowline for operating at least one hydraulic cylinder that is coupled to the lift/lower element; and energy supply means comprising: at least one battery to provide electrical energy to the electric motor; and at least one hydrogen fuel cell for generating and supplying the battery with electrical energy for charging the battery. The worksite or construction site machine can be for example an excavator with lift/lower elements in the form of a boom, an arm, and a bucket.

Abstract: A cylinder has a piston part, a cylinder part, and a pipe section connected to the piston or cylinder parts. A portion of the pipe section encloses a pressure compartment which receives a fluid to apply a pressure on a pressure surface so the piston part is displaced in a first stroke direction. A first return pressure compartment receives a fluid to apply a pressure on a first return pressure surface so that the piston part is displaced in a second return stroke direction. The first return pressure compartment is positioned on the outside of the pipe section, and the area of the first return pressure surface is substantially equal to the area of the return pressure surface so that a volume-neutral operation of the cylinder is provided. Also described is a hydraulic system, an excavator comprising the cylinder and a procedure for operation of the cylinder.

Abstract: A tool robot is for use in construction. The tool robot has a carriage with tracks or wheels for transporting the tool robot; a first adapter connected to the carriage and rotatable around an axis; a structure connected to the first adapter; and an arm connected to the structure. The arm is arranged to hold a tool. An extendable scissors device is connected to the carriage centrically around the axis. The scissors device has steel strings with articulations and a second adapter rotatable around the axis relative to the scissors device.

Abstract: The invention concerns a casing tool and a method for connecting casing tubulars using a top drive. The casing tool comprises a top cover that may be connected either releasably or non-releasably to the top drive and an elongated inner body that may be connected releasingly to the top cover. The inner body displays a longitudinally directed through-going channel, preferably with a gasket near one of its longitudinal ends, and comprises a first longitudinal part slideably arranged within the lop cover and a second longitudinal part that may be guided into a casing tubular. One or more radially displaceable clamps is connected to the lower part of the casing tool for engaging the inside wall of the casing tubular. The radial displacement of the clamps is achieved by use of radial displacement means.

Abstract: Continuously rotating power tong for making the threaded connections (2) of pipes, primarily used for drilling for oil and gas in the petroleum industry. The power tong comprising radially movable jaw sections (22), connected to a driving disc (12), where hydraulic pumps (16, 17) are mounted, the pumps (16, 17) being driven by an endless chain (15) through gears (35) and the chain (15) being driven by motors (18, 19) through gears (27, 28).

Abstract: An apparatus for maintaining constant circulation of drilling fluid includes a valve section (5) at the top of each section of drill pipes to be connected to or removed from the drill string. The valve section (5) has a top inlet for axial circulation and a side inlet (5b) for radial circulation. Two separate valves (5c, 5d) within the valve section controls flow through the inlets. An external valve control device (4) has a circulation adapter (4b) for connecting drill fluid at operational pressure to the side inlet (5b) and separate activating adapters (4c, 4d) connecting to the couplings for opening or closing the valves (5c, 5d).

Abstract: A power tong device (1) for handling of a threaded pipe connection wherein the power tong device (1) comprises a frame (6) having a power tong (10) and a holding tong (8) and also a drive gear (12) for the power tong (10), and wherein the power tong (10) is displaceable relative to the holding tong (8) along its rotational axis, as the power tong (10) is radially displaceable relative to the holding tong (8), and wherein the power tong (10) is connected to the drive gear (12) by means of a radially displaceable coupling (26, 54).

Abstract: A directional-control apparatus for a drilling tool, in which the direction of the drilling tool during the drilling of a borehole is controlled by means of at least one steering body which is moved radially against the wall of the borehole, the movement of the at least one steering body relative to the center axis of the directional-control apparatus being adjustable in order to steer the drilling tool in a desired direction and at a desired deflection, and at least one electrically operated actuator being connected via at least one set of transmission elements to the at least one steering body and arranged to move the at least one steering body into a position relative to the center axis of the directional-control apparatus, the relative position having the effect that the drilling tool is steered in the desired direction and at the desired deflection.

Abstract: A wind turbine device, in which the rotor of the wind turbine is connected to a rotor shaft, and in which a torque is transmitted from the rotor to a power machine, and in which the torque is transmitted between the rotor and power machine via a harmonic gear.

Abstract: A sealing and/or anchoring element for use in pipelines. The sealing and/or anchoring element includes at least one helical element disposed around a string section, with the helical element being configured so as to be able to expand radially towards an inner wall of the pipeline as the circumferential diameter thereof is increased.

Abstract: A device for an electromechanical hoisting machine (10) with driving gears (6) in engagement with rack rails (5) fixed to a steel structure (1). The hoisting machine is driven by electromotors (8) which transmit torque to the driving gears (6) through the gearing (11), the shaft (15) and further the bevel gear drives (14, 16, 17) and gears (18, 19) to the driving gears (6) in engagement with rack rails (5). To achieve flexible load distribution on the driving gears (6), differential gears (12) supported on projecting shaft journals (20) connected to the main shaft (15) are arranged between the bevel gear drives (16).

Abstract: A pump piston device is for reciprocating movement in a pump cylinder. Between the pump piston and the pump cylinder, an annular space is formed which is defined by a first seal and a second seal, the annular space being pressurized, and the first seal and the second seal being in a common piece of material which constitutes the pump piston.

Abstract: A power tong device (1) for handling of a threaded pipe connection wherein the power tong device (1) comprises a frame (6) having a power tong (10) and a holding tong (8) and also a drive gear (12) for the power tong (10), and wherein the power tong (10) is displaceable relative to the holding tong (8) along its rotational axis, as the power tong (10) is radially displaceable relative to the holding tong (8), and wherein the power tong (10) is connected to the drive gear (12) by means of a radially displaceable coupling (26, 54).

Abstract: An adjustable centering tool for use in pipes of varying inner diameter. The centering tool being provided with a number of identical and steplessly adjustable, radially protruding wings having guiding lugs and chamfered end faces. The wings, having been set, are retained by an upper lock mandrel with a safety pin and a lower lock mandrel with a safety nut. The outer circumference of a cylindrical tool body is fitted with longitudinal grooves having sloped terminations cooperating with the wing dimensions, the chamfered end faces of the wings, and the guiding lugs.

Abstract: A harmonic gear device (10) in which a spindle (28) and a gear rim (48) are rotatable relative to each other on a common centre axis (32), and in which a gearwheel (42), which is engaged with the gear rim (411), is rotatably connected to the spindle (28) around a first eccentric axis (36), and in which a balancing gearwheel (58), which is engaged with the gear rim (48) or a balancing gear rim, is rotatable around a second eccentric axis (40).

Abstract: A wind turbine device, in which the rotor of the wind turbine is connected to a rotor shaft, and in which a torque is transmitted from the rotor to a power machine, and in which the torque is transmitted between the rotor and power machine via a harmonic gear.

Abstract: A device for an electromechanical hoisting machine (10) with driving gears (6) in engagement with rack rails (5) fixed to a steel structure (1). The hoisting machine is driven by electromotors (8) which transmit torque to the driving gears (6) through the gearing (11), the shaft (15) and further the bevel gear drives (14, 16, 17) and gears (18, 19) to the driving gears (6) in engagement with rack rails (5). To achieve flexible load distribution on the driving gears (6), differential gears (12) supported on projecting shaft journals (20) connected to the main shaft (15) are arranged between the bevel gear drives (16).

Abstract: The invention regards an apparatus and method for maintaining constant circulation of drilling fluid during the entire drill process. A cylindrical valve section (5) is adapted to be included in the drill string, and included at the top of each section of drill pipes to be connected to or removed from the drill string. The valve section (5) has a top inlet for axial circulation and a side inlet (5b) for radial circulation. Two separate valves (5c, 5d) within the valve section controls flow through the inlets. Each valve is operated through couplings on an outer surface of the valve section (5). An external valve control device (4) is operated by remote control, and comprises a circulation adapter (4b) for connecting drill fluid at operational pressure to the side inlet (5b) and separate activating adapters (4c, 4d) connecting to the couplings for opening or closing the valves (5c, 5d).

Abstract: A directional-control apparatus for a drilling tool, in which the direction of the drilling tool during the drilling of a borehole is controlled by means of at least one steering body which is moved radially against the wall of the borehole, the movement of the at least one steering body relative to the centre axis of the directional-control apparatus being adjustable in order to steer the drilling tool in a desired direction and at a desired deflection, and at least one electrically operated actuator being connected via at least one set of transmission elements to the at least one steering body and arranged to move the at least one steering body into a position relative to the centre axis of the directional-control apparatus, the relative position having the effect that the drilling tool is steered in the desired direction and at the desired deflection.

Abstract: A method for intervention in an underwater production well, in which the well head (1) of the production well is located on the seabed (2), and wherein a drilling rig (26), which comprises at least a robotized drill floor (32), is placed at the well head (1), after which necessary intervention operations are carried out in a remote-controlled manner by means of the drilling rig (26).