| 摘要 |
The wedge (1) comprises a support (3) which slides on a longitudinal side T shaped rail (5). An arm (2) pivots about a spindle (7) orthogonal to the floor (P). The end (2') of the arm, adjacent to the support, has faces which abut against the rail. The arm end is in the shape of a flattened cone having three faces which constitute wedging locks. When the arm is perpendicular to the rail the support slides freely on the rail. When the arm is pivoted the side faces abut against the rail, locking the sliding support on the rail and the pivoting of the arm.
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