| 摘要 |
Jack articulation, particularly of the scissor (parallelogram) type, in which two arms (1, 2) articulated at the end by articulation cheeks (3, 4, 5, 6) onto an articulation pin (11) traversed perpendicularly using a threaded hole by an operating screw (10), characterised in that the internal cheeks (5, 6) of the nest include a rim (7, 8) coming to bear tangentially (9) on either side of the operating screw (10), the rim (7, 8) extending along a sector keeping this bearing tangential over the entire area of relative angular displacement of the articulated arms (1, 2). <IMAGE>
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