| 摘要 |
A trunnion (4) on a support (3) slides and turns in a curved track (2) in a track support (1). A further trunnion (4a) on the latter works in a second curved track (2a) in the trunnion support, so that positive opposite guides are formed. When the supports are in the starting position, the trunnions working in the tracks can be at the ends of the latter furthest from the trunnions on the supports themselves. One of the tracks can be straight, and the other curved to a predetermined radius. There can be a trunnion-insertion opening in each track, at right angles to the track itself. |
