| 摘要 |
. To permit continuous selected longitudinal adjustment of a support block (8, 34) with respect to a support surface.(S) along the length of an elongated rail element (1), an attachment base is formed on the rail element which interfits with a projectin-and-recess fit with a portion of the support block. A clamping arrangement (7) can clamp the interengaging projection-and-recess portions together; preferably, they form a dovetail connection, with a movable clamping Jaw which clamps both against the attachment base and the support block structure. The support block may include a plate, adjustably positioned over the surface by adjustment screw bolts, or a rod or tube element, so that the rail can also be tilted about the axis of the rod or tube element.
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