| 摘要 |
The conduit (5) includes a rotary fitting (11), and two segments (18, 19) elbow-connected to each other and each having an articulated mechanism (23, 24) including a pair of U-section bars (26, 27) connected to each other in the form of an articulated parallelogram by means of two articulated elements (37, 44; 44, 51). A spiral compression spring (35, 36) is housed between each pair of bars (26, 27), and is compressed between a disk (55), integral with one of the bars (26, 27), and a flange (64) sliding along a threaded rod (62). The flange (64) is locked on the rod (62) by means of a nut (67), and the rod (62) is connected to a lever member (69) pivoting on one of the articulated elements (37, 44) so as to adjust the action of the spring (35, 36) as a function of the angular position of the relative segment (18, 19) with respect to the articulated element (37, 44). |
