| 摘要 |
<p>The clamping head (1) has a sleeve (3) which is provided on a drill rod (5). The drill rod guided with hollow shaft (2) is rotatably connected with drilling shaft (15) of a drive head (9). The pivot bearing (10) is provided with bearing rings (10A,10B) which are rotatably connected to the sleeve. The end portion (7A) of linear actuator (7) is fastened on drive head via fastening element (8) with respect to axial direction. A rotary bearing (6) having bearing rings (6A,6B) is arranged in the upper end region of the hollow shaft. An independent claim is included for earth oil well drilling installation.</p> |
