FIELD: mining. SUBSTANCE: drill bit has additional retaining rod 7 which is secured with its one end in additional hollow 6. Hollow 6 is located in diametrical plane relative to main retaining rod. Opposite ends of main and additional rods are located between parts of retaining ring 8. Retaining rod 7 may be made of magnetic material. Thickness of part projecting from pin 2 of retaining rod 7 is equal to width of section of retaining ring 8. EFFECT: higher efficiency. 3 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| SECTIONAL DRILL BIT | 1992 |
|
RU2034126C1 |
| DRILL BIT | 1991 |
|
RU2014422C1 |
| DRILL BIT | 1991 |
|
RU2007538C1 |
| DISC DRILL BIT | 1991 |
|
RU2006565C1 |
| CORE DRILLING BIT | 1990 |
|
RU2017926C1 |
| 0 |
|
SU1779276A3 | |
| BIT FOR ELECTROTHERMOMECHANICAL DRILLING | 1990 |
|
RU2017925C1 |
| CORE BARREL | 1992 |
|
RU2069735C1 |
| DEVICE FOR WELL DRILLING WITH RETRIEVABLE CORE RECEIVER | 1990 |
|
RU2017931C1 |
| CORE TOOL | 0 |
|
SU1806258A3 |
