An arrangement and a method for installing a casing in a borehole are described. The arrangement includes a casing, a boring pipe, which is adapted within the casing, and the boring pipe includes flow channels for compressed air and a flushing medium. The flushing medium flow channel is arranged to lead the flushing medium to the bottom of the borehole. The arrangement also includes a percussion hammer , which includes a compressed air operated percussion piston adapted in a cylinder of the percussion hammer, as well as hole drilling means for drilling a hole for the casing. The flushing medium flow channel is adapted to bypass the percussion piston or which flushing medium flow channel is adapted to pass through the percussion piston, and in which arrangement the drilling means additionally includes splines transmitting a rotating motion and adapted to conduct the compressed air that used the percussion piston through the splines.

An arrangement and a method for installing a casing in a borehole are described. The arrangement includes a casing, a boring pipe, which is adapted within the casing, and the boring pipe includes flow channels for compressed air and a flushing medium. The flushing medium flow channel is arranged to lead the flushing medium to the bottom of the borehole. The arrangement also includes a percussion hammer , which includes a compressed air operated percussion piston adapted in a cylinder of the percussion hammer, as well as hole drilling means for drilling a hole for the casing. The flushing medium flow channel is adapted to bypass the percussion piston or which flushing medium flow channel is adapted to pass through the percussion piston, and in which arrangement the drilling means additionally includes splines transmitting a rotating motion and adapted to conduct the compressed air that used the percussion piston through the splines.

The rotary percussive hydraulic perforator comprises a body; a fitting; a striking piston configured to strike the fitting; a stop piston including a front face facing the fitting and a rear face situated opposite to a rear wall of a cavity receiving the piston stop; and a main hydraulic supply circuit including a high pressure fluid supply conduit and a low pressure fluid return conduit. The body and the stop piston delimit a first control chamber permanently connected to the high pressure fluid supply conduit and configured to bias the stop piston forwards, and a second control chamber configured to bias the stop piston forwards and permanently connected to a low pressure accumulator connected to the low pressure fluid return conduit.

A percussion device that includes: an input side; an output side; at least one drive transmitter; a drive transmitter pathway; a percussion impactor; and a percussion anvil; where: the drive transmitter pathway is a circumferential pathway around a longitudinal axis of the percussion device; the drive transmitter pathway includes at least one tooth section including a lift section and a lead section; the at least one tooth section is essentially one wavelength of a sawtooth wave; the lift section is inclined away from a base of the drive transmitter pathway; the lead section is a section of the tooth section which abruptly returns to the base of the drive transmitter pathway; the input side is rotationally isolated from the percussion impactor; the percussion anvil is attached to, or forms part of, the output side; the percussion impactor includes an impact end and a force input end which are longitudinally opposite terminal ends of the percussion impactor; and the impact end faces the percussion anvil; such that: when in use, and the output section is free to rotate, the at least one drive transmitter and the drive transmitter pathway are configured to act co operatively to transfer the rotational motion of the input side to the output side; and when in use and limited or no rotation of the output side is possible, the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to increase, maintain or decrease the distance between the percussion impactor and the percussion anvil; wherein the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to accept rotational motion from the input side and transmit a percussive and/or rotational motion to the output side.

A percussion device that includes: an input side; an output side; at least one drive transmitter; a drive transmitter pathway; a percussion impactor; and a percussion anvil; where: the drive transmitter pathway is a circumferential pathway around a longitudinal axis of the percussion device; the drive transmitter pathway includes at least one tooth section including a lift section and a lead section; the at least one tooth section is essentially one wavelength of a sawtooth wave; the lift section is inclined away from a base of the drive transmitter pathway; the lead section is a section of the tooth section which abruptly returns to the base of the drive transmitter pathway; the input side is rotationally isolated from the percussion impactor; the percussion anvil is attached to, or forms part of, the output side; the percussion impactor includes an impact end and a force input end which are longitudinally opposite terminal ends of the percussion impactor; and the impact end faces the percussion anvil; such that: when in use, and the output section is free to rotate, the at least one drive transmitter and the drive transmitter pathway are configured to act co operatively to transfer the rotational motion of the input side to the output side; and when in use and limited or no rotation of the output side is possible, the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to increase, maintain or decrease the distance between the percussion impactor and the percussion anvil; wherein the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to accept rotational motion from the input side and transmit a percussive and/or rotational motion to the output side.

A device for earth or rock drilling has a mast, a drill drive with a shaft for rotatably driving a drill rod, a drill drive carriage, on which the drill drive is arranged, movably supported along the mast, and an oscillation generating drive disposed behind the drill drive in a drilling direction connected to the drill rod for transmitting an oscillation. A rear connecting end of the shaft or the drill rod projects rearwards from the drill drive. A rotary coupling with a first coupling piece is provided on the connecting end in an axially fixed and torque-proof manner, and a second coupling piece is axially fixed and rotatable relative to the first coupling piece. The oscillation drive has a clamping means for releasably clamping the second coupling piece, such that in the clamped state an axially fixed connection is formed between the oscillation drive and the second coupling piece.

A device for earth or rock drilling has a mast, a drill drive with a shaft for rotatably driving a drill rod, a drill drive carriage, on which the drill drive is arranged, movably supported along the mast, and an oscillation generating drive disposed behind the drill drive in a drilling direction connected to the drill rod for transmitting an oscillation. A rear connecting end of the shaft or the drill rod projects rearwards from the drill drive. A rotary coupling with a first coupling piece is provided on the connecting end in an axially fixed and torque-proof manner, and a second coupling piece is axially fixed and rotatable relative to the first coupling piece. The oscillation drive has a clamping means for releasably clamping the second coupling piece, such that in the clamped state an axially fixed connection is formed between the oscillation drive and the second coupling piece.

A rotary percussive hydraulic drill comprises a body; a shank having female coupling splines and male coupling splines; a striking piston configured to strike the shank; a rotation drive device configured to drive the shank in rotation; a front abutment surface against which the shank is configured to come into abutment. The shank has an annular bearing flange which is provided on an outer surface of the shank and which has an annular bearing surface configured to come into abutment against the front abutment surface. Each of the female and male coupling splines provided on the shank extends from the annular bearing flange in the direction of the striking piston, wherein a connecting surface of each female coupling spline provided on the shank being at least in part formed by a curved concave surface extending substantially in an extension direction of the respective female coupling spline and having a radius of curvature which is less than a radial height of each of the male coupling splines provided on the shank.

A rotary percussive hydraulic drill comprises a body; a shank having female coupling splines and male coupling splines; a striking piston configured to strike the shank; a rotation drive device configured to drive the shank in rotation; a front abutment surface against which the shank is configured to come into abutment. The shank has an annular bearing flange which is provided on an outer surface of the shank and which has an annular bearing surface configured to come into abutment against the front abutment surface. Each of the female and male coupling splines provided on the shank extends from the annular bearing flange in the direction of the striking piston, wherein a connecting surface of each female coupling spline provided on the shank being at least in part formed by a curved concave surface extending substantially in an extension direction of the respective female coupling spline and having a radius of curvature which is less than a radial height of each of the male coupling splines provided on the shank.

A hydraulic lift apparatus for operating a downhole pump features a hydraulic linear actuator with a piston longitudinally slidable on a central axis of a rotatable portion of a housing. An anti-rotation rod runs longitudinally through the piston at a position radially offset outwardly from the central axis to prevent rotation between the piston and housing. A stationary motor powers a drive train whose output is connected to the rotatable portion of the housing and centered on the central axis. The actuator is one-way actuator with a hydraulically driven upstroke. A leak detection passage extends through the piston to collect fluid that has leaked across the piston seals and convey it to a leak detection port and associated containment tank. A position sensor for monitoring the piston movement features a sensing rod depending downwardly into a hollow piston shaft carried by the piston and connected to the pump rod.