FIELD: mining industry. SUBSTANCE: reamer has body carrying stepped legs with wedge roller bits. Roller bits are installed on legs in cantilever manner and found between body and legs. EFFECT: higher drilling efficiency due to the fact that minimum distance between roller bit and body is equal to or, exceeds the height of wedge-like cutting structure of roller bit. 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| REAMER FOR DRILLING WELLS OF LARGE DIAMETER | 1992 |
|
RU2019701C1 |
| BENCHING BIT | 0 |
|
SU1774983A3 |
| DISK ROLLER-CUTTER FOR DRILLING HOLE SHOULDERS | 0 |
|
SU1756527A1 |
| REAMER FOR DRILLING SHAFTS AND HOLES | 0 |
|
SU1809077A1 |
| ROLLER TOOL OF STEPPED ACTION | 1992 |
|
RU2019700C1 |
| ROCK-BREAKING MEMBER FOR DRILLING MINE SHAFTS AND LARGE-DIAMETER WELLS | 0 |
|
SU1167336A1 |
| ARRANGEMENT FOR SINKING VERTICAL MINE WORKINGS | 0 |
|
SU752012A1 |
| BORE BIT WITH THREE ROLLER CUTTERS | 2007 |
|
RU2361998C1 |
| ROLLER-CUTTER DRILLING BIT | 0 |
|
SU1795071A1 |
| CONE DRILL BIT | 1992 |
|
RU2044860C1 |
