Patent application number | Description | Published |
20090025948 | Percussion Device - The invention relates to a method for controlling the operation of a pressure fluid operated percussion device and to a pressure fluid operated percussion device. The method comprises influencing the shape of a stress wave by setting a suitable clearance between a transmission piston and a tool. The percussion device is provided with means for setting the clearance between the transmission piston and the tool. | 01-29-2009 |
20090065256 | Method and Rock Drilling Rig for Hole Drilling - The invention relates to a method and a rock drilling rig for drilling a hole in a rock. In the method the hole is drilled with a so-called top-hammer rock drilling rig including a drill rod and a cone roller bit at the end of the drill rod. During drilling with the percussion device, stress pulses of low amplitude are produced at a high frequency of at least 200 Hz. In the rock drilling rig, the cone roller bit ( | 03-12-2009 |
20090266568 | Method for Controlling Pressure Fluid Operated Percussion Device, and Percussion Device - The invention relates to a method for controlling a pressure fluid operated percussion device comprising a working chamber for pressure fluid and in the working chamber a transmission piston installed movably with respect thereto so as to enable a tool installed in the percussion device to be pressed against a material to be broken in order to generate a stress pulse, and to a percussion device. | 10-29-2009 |
20100116518 | COUPLING ARRANGEMENT FOR COUPLING ROCK DRILL SHANK - The invention relates to a coupling arrangement for coupling a drill shank of a rock drill unrotatably but axially movably. The coupling arrangement comprises power transmission members between the surfaces of the drill shank and the rotation bushing, which transmission members rotate along the surfaces, as the drill shank moves longitudinally to the rotation bushing, and transmit the rotation torque from the rotation bushing to the drill shank. | 05-13-2010 |
20100147084 | MEASURING DEVICE, ROCK BREAKING DEVICE AND METHOD OF MEASURING STRESS WAVE - The invention relates to a method of measuring a stress wave and to a measuring device and a rock breaking device. A percussion device ( | 06-17-2010 |
20120018182 | PERCUSSION DEVICE - The invention relates to a percussion device having a frame, a tool mounted movable in its longitudinal direction, the percussion device containing a work chamber having a movably mounted transmission piston to compress the tool so that a longitudinal stress pulse is generated to the tool, inlet and outlet channels for conducting the pressure fluid to the percussion device and away from it and a control valve that alternately directs the pressure fluid from the inlet channel to the work chamber to act on the transmission piston and, correspondingly, discharges the pressure fluid from the percussion device. The percussion device and trans-mission piston have channels that connect the pressure fluid that acted on the transmission piston to flow during the return movement of the transmission piston through the control valve and transmission piston to the pressure fluid outlet channel and cut off the flow when the transmission piston has returned to its initial position. | 01-26-2012 |
20120018657 | SEALING ARRANGEMENT IN ROTATING CONTROL VALVE OF PRESSURE FLUID-OPERATED PERCUSSION DEVICE - The invention relates to a sealing arrangement in a rotating control valve of a pressure fluid-operated percussion device, to which percussion device a tool is mountable movable in its longitudinal direction, the percussion device containing a work chamber and a transmission piston mounted movable to compress the tool suddenly to generate a stress pulse to the tool, inlet and outlet channels for conducting pressure fluid to the percussion device and away from it, and a control valve having a rotating switch member with channels to connect inlet and outlet channels through the channels of the switch member to alternately conduct the pressure fluid through the channels to the work chamber and, correspondingly, away from the work chamber, and in the inlet channel of the pressure fluid at the switch member side end thereof at least one sealing sleeve for the purpose of sealing the inlet channel to the switch member. In the arrangement, the sealing sleeve is mounted obliquely to the surface of the switch member and the switch member side surface of the sealing sleeve is essentially in the shape of the switch member surface. | 01-26-2012 |
Patent application number | Description | Published |
20090188686 | Method for controlling percussion device, software production, and percussion device - A method and software product for controlling a percussion device belonging to a rock-drilling machine, and a percussion device. The impact frequency of the percussion device is set so that the percussion device forms a new compression stress wave to the tool always when reflected waves from the previous compression stress waves reach a first end of the tool. This requires that the impact frequency be set proportional to the propagation time of the stress wave, whereby the length of the used tool and the propagation velocity of the stress wave in the tool material are to be noted. | 07-30-2009 |
20120292114 | Method and Arrangement for Lubricating Drill Shank of Rock Drilling Machine - A method for lubricating a drill shank ( | 11-22-2012 |
20130180784 | ROCK DRILL BIT AND A DRILLING ASSEMBLY FOR PERCUSSIVE ROCK DRILLING - A rock drill bit for percussive drilling includes a bit head attached at an end of a drill element of a drilling assembly. The bit head has a diameter larger than that of the drill element. The bit head has at a front end as seen in the intended drilling direction a plurality of buttons distributed thereon to engage material to be crushed. At least one of the buttons is allowed to rotate about its own symmetry axis. | 07-18-2013 |
20130180785 | ROCK DRILL BIT FOR PERCUSSIVE DRILLING AND A ROCK DRILL BIT BUTTON - A button and a rock drill bit for percussive drilling including a bit head attached at an end of a drill element of a drilling assembly. The bit head has at a front end, as seen in the intended drilling direction, a plurality of buttons distributed over the bit head to engage material to be crushed. At least one of the buttons has a shank portion made of a substrate material of particles of a first material embedded in a binder phase. The first material is harder than the binder phase. The shank portion at least partially forms a bearing portion, the material of which is harder than the binder phase. At least one of the buttons is allowed to rotate about its own respective symmetry axis. | 07-18-2013 |