| 摘要 |
Sleeve arrangement (1) for a rock drill, comprising a sleeve (3), which is n on- rotating during drilling and is arranged on an outer sleeve device (5), whic h belongs to the rock drill and is also non-rotating during drilling, which sleeve arrangement, at intervals during the drilling, is subjected to a drilling fluid pressure and will be held in a rotation-proof position with t he aid of adjustable supporting units (7), the supporting units (7) being arranged so as to be held against a bore hole wall (9) with a friction which is low enough to be surmountable in the axial direction by means of downward pressure of a drilling tube (11) during drilling and high enough to friction - lock against possible rotation under the influence of the drilling tube (11) as this rotates. The sleeve arrangement (1) comprises at least one supportin g unit (7, 7a) which is directly acted upon in the radial direction by the drilling fluid and has protruding elements (13) which can engage in a bore hole wall (9) such that the sleeve arrangement (1) is non-rotatable in the peripheral direction in relation to the bore hole wall (9), and the at least one supporting unit (7) is arranged in a corresponding recess (15) located i n the sleeve (3).
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