Abstract: A downhole tool (1) method and device, in which the downhole tool (1) is designed to form part of a pipe string (4), and in which a valve (24) is provided with a passage (120) for fluid, the passage (120) including an opening and closing mechanism (78), and the method including: connecting a first valve portion (26) to the pipe string (4); connecting a second valve portion (28) telescopic relative to the first valve portion (26) to a downhole object (20); pre-tensioning the first valve portion (26) and the second valve portion (28) in the direction of contraction to an initial position, in which the opening and closing mechanism (78) is open; and moving the first valve portion (26) relative to the second valve portion (28) in the direction of extension to close the opening and closing mechanism (78).

Abstract: A lubrication structure for a working machine is provided. A driven gear that engages with a driving gear connected to a driving source and rotates, is accommodated in a chamber in a case. An eccentric cam is provided on a surface of the driven gear, and connected to a coupling pin in a blade through a crank member. A fitting ring part is provided in one end of the crank member, and the eccentric cam is inserted into the fitting ring part so as to rotate relative to the fitting ring part. An annular groove is formed on the inner surface of the fitting ring part which faces the outer surface of the eccentric cam. The annular groove communicates with a first chamber via a first lubricating passageway and also communicates with a second chamber via a second lubricating passageway.

Abstract: A lubrication structure for a working machine is provided that can evenly supply lubricant to a sliding contact surface between an eccentric cam and a crank member regardless of lubricant used and the use environment. A driven gear that engages with a driving gear connected to a driving source and rotates, is accommodated in a chamber in a case. An eccentric cam is provided on a surface of the driven gear, and connected to a coupling pin in a blade through a crank member. A fitting ring part is provided in one end of the crank member, and the eccentric cam is inserted into the fitting ring part so as to rotate relative to the fitting ring part. An annular groove is formed on the inner surface of the fitting ring part which faces the outer surface of the eccentric cam. The annular groove communicates with a first chamber via a first lubricating passageway and also communicates with a second chamber via a second lubricating passageway. The pressure in the first chamber is higher than that is the second chamber.

Abstract: A rock drilling machine includes a sleeve having openings surrounding a portion of a lubrication channel. A groove surrounds the sleeve, and one end of a second channel is connected to the groove. The other end of the second channel is connected to a lubrication point so that lubricant from the lubrication channel is distributed from the lubrication channel, through the sleeve and groove to the second channel, and from the second channel to a lubrication point of the rock drilling machine.

Abstract: A rock drill includes a shank. A percussion piston is arranged to hit the back end of the shank. Further, a pulling element is arranged around the shank, to which a pulling force can be directed in such a manner that the shank can, by the pulling force, be moved toward the percussion piston, when stuck drilling equipment is freed. During rock drilling, a push force is arranged to act on the pulling element, the push force being opposite with respect to the pulling force. The push force is designed in such a manner that during drilling the pulling element moves due to the push force toward the front section of the drill to be at a predefined distance from the position corresponding to the impact point of the shank.

Abstract: Improvement to a hydraulic striking machine including among other things a body part and a piston, moving to and fro in the body and being accelerated to strike against a tool. The air current produced is led out of the machine uniformly along the surface of the tool to clean the tool.

Abstract: For reducing the amount of water consumed, supply of water to the cutting head of a cutting machine shall be given free only if different operating conditions are simultaneously occurring. The proposed process contemplates to provide the possibility to supply water to the cutting head only with the rotational movement of the cutting head being switched-on and to give free the water supply only if simultaneously at least one further operating condition such as, for example, a movement of the cutting arm or a movement of the machine is occurring.The apparatus for performing this process contemplates a device for switching-in a water pump, said device being coupled with a device for switching-in the rotational drive of the cutting head.

Abstract: Disclosed is a holder for the attachment of cutters or bits, to mining and tunnelling machines, which has at least one spray nozzle for coolant spraying of the cutter working area. The holder comprises means for receiving the cutter shank in the holder, an insert sleeve surrounding the cutter shank inserted with axial play in the means for receiving the cutter shank and a shut-off member carried on the insert. The shut-off member engages into a coolant supply line to the spray nozzle when a pressure load is applied to the cutter and shuts off the coolant supply when there is no load on the cutter.

Abstract: High pressure fluid apparatus having a swivel flow divider connected to a rotary power source and an accompanying power cylinder for transferring high pressure fluid from a stationary to a rotary medium and a fluid jet rotary bit. The swivel flow divider defines a pair of integral seal bearings which can be variably positioned by means of the power cylinder to divert substantially all of the fluid flow into a fluid conducting tube at high pressures, e.g. up to about 10,000 psi to about 20,000 psi to divert fluid flow to a relatively low pressure region surrounding the fluid conducting tube, or to apportion fluid flow between the tube and the low pressure region surrounding the tube. The fluid jet bit has a bit body including a wear resistant insert which can be removed from a fluid jet housing and mounting without subjecting fluid jet orifices secured in the latter to damage.

Abstract: A tool for introducing self-tapping dowels in a structure by a drilling process which is accompanied by the generation of large-size drillings, has a shaft connectable with a drive, a dowel holder connectable with the shaft and having a receiving bore which includes a first section adapted to receive a dowel shank and a second section adapted to receive the large-size drillings, and a suction arrangement movable relative to the dowel holder to and from an operative position in which it communicates with the second portion of the dowel holder and draws air therethrough to thereby suck the large-size drillings into the second section of the dowel holder bore wherein they are retained during the drilling process.