| 摘要 |
The device comprises a tubular body 10 inserted into the string of rods 3 onto which a tubular sleeve 15 is mounted. A support blade 6 is mounted to move in a radial direction inside the tubular sleeve 15. The sleeve 15 forms an annular pressure chamber around the body 10. The support blade 6 is subjected to the pressure inside the chamber on its internal face. The chamber can be connected with the central bore of the string of rods to cause the blade 6 to act. The sleeve 15 can be locked against rotation with the string of rods 3 by means 25, 26. The tubular sleeve 15 can also be immobilised against axial translational movement in relation to the body 10. All of the means for moving and locking are remote-controlled. <IMAGE>
|
