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| Number | Title | Issue Date |
| 6810956 | Thread coupling for a drill string for percussive rock drilling A thread coupling for a drill string for percussive drilling has a male thread (5) and a cooperating female thread (4). The male thread is arranged on a first drill string element (3) having a first impact surface (6). The female thread i... | 11/02/2004 |
| 6003622 | Drill tube for use in upward rock drilling Drill tube provided with a check valve and comprising a tube (1) and two end pieces (2,3). One of the end pieces comprises a first contact surface (4) for limiting the movement of a valve body (5) when the check valve is open and a second contact surface ... | 12/21/1999 |
| 5992545 | Down-the-hole drilling machine Down-the-hole drilling machine comprising a housing (1) with a hammer piston (5) movable to-and-fro and intended to exert a drill bit (3) to impacts. The hammer piston is formed with two piston heads (6,7) and a waist (9) between them. An intermediate wal... | 11/30/1999 |
| 5785360 | Thread coupling for drill string elements for percussive drilling A thread coupling for percussive drilling has a first drill string element (2) with an internal thread (3) and a second drill string element (6) with a spigot (7) which is provided with an external thread (8) for cooperation with the internal thread (3). ... | 07/28/1998 |
| 5688163 | Vibration dampening grinding cup and grinding cup holder for handheld grinding machines This invention relates to a vibration dampening grinding cup for handheld grinding machines for the grinding of hard metal buttons on button bits, comprising a grinding head and a shaft made with a common axial channel for cooling medium, which distinguis... | 11/18/1997 |
| 5318140 | Fluid operated drill apparatus Down-the-hole drill comprising a housing (1), a hammer piston (6) movable to-and-fro in the housing and intended for impacting a drill bit (5). A back piece (3) provided with an extension (12) with a valve part (17) cooperates with a part (8) of a central... | 06/07/1994 |
| 5279371 | Down-the-hole drilling machine Down-the-hole drilling machine comprising a housing in form of a tube (1), a hammer piston (6) being movable to-and-fro in the tube and intended for impacting a drill bit (5). The hammer piston is at its ends provided with end sections in form of polygons... | 01/18/1994 |
| 5244049 | Rock drilling device Rock drilling device comprising a drilling tool with a set of tubes (7) and a set of rods (9) arranged therein. The drilling tool comprises a number of sections which each comprises a tube (7), a rod (9) and an end piece (11). The rod is provided with pro... | 09/14/1993 |
| 5207280 | Device in hammer machines Device in hammer machines. The device comprises a machine housing (1) and a hammer piston (2) movable to-and-fro in the machine housing. A drilling tool connected to the machine housing comprises a drill bit (5), a set of tubes (4) for rotating the drill ... | 05/04/1993 |
