| 摘要 |
The end bushings (102, 102') of the anti-twisting cross member (2) and the upper ends (201, 201') of the outer sliding tubes (1, 1') which are adapted to be coupled into the bushings, are provided laterally respective appendices (10, 10' 22, 22') with respective bores (11, 11', 23, 23'). These parts are superposed and are safely secured together with screws (25, 25') which fasten the outer sliding tubes to the cross member, thus arranging the outer sliding tubes at a predetermined axial distance. The parallelism between the outer sliding tubes is ensured by the abutment of the lower edge (15, 15') of the bushings of the cross member against a corresponding lower step (9, 9') of the upper machined portions of the outer sliding tubes, inserted into the bushings. The possible small clearances due to machining between the coupled parts of the outer sliding tubes and the cross member, are annulled by utilizing a resin inserted between the parts, which initially is liquid and then hardens.
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