| 摘要 |
An arrangement for a telescope feeder of a rock-drilling machine, comprising two telescopic portions (3a, 3b), between which is connected an extension cylinder (6) and whereby the rock-drilling machine (1) moves along one telescopic portion (3a). The extension cylinder (6) comprises a separate adjusting piston, which is mounted movably around the piston rod (6b) so that it can move irrespective of the piston (6a) of the extension cylinder (6). Three cylinder spaces (8a to 8c) are thus formed inside the extension cylinder (6) and to each cylinder space is connected a separate channel (9a to 9c) for pressure medium, so that the adjusting piston (7) can be displaced to a desired position.
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