| 摘要 |
The output shaft (10) of the motor (M) can be connected via a coupling arrangement (9,14,29) with the rotation shaft (3) of the frame, and/or with the second drive (4) and when the connection (12,17,19) between the motor and the frame rotation shaft is uncoupled rotation of the frame is automatically stopped. In the gear is an intermediary shaft (2) provided with a gearwheel and driven by the motor. On the intermediary shaft is a casing (15) which is rotatable and axially displaceable. The central part of the casing incorporates a cogged pinion (17), which via a gearwheel (18) is connected to the frame rotation shaft, and whose two ends have axially extending coupling teeth (16,30). A spring (21) activates the casing towards a first position where the coupling teeth (16) of one end work in conjunction with similar teeth (13) formed axially on the intermediary shaft gearhweel. A power transmitting component, on activation, feeds pressure fluid to a sealed chamber (24) housing the end (19) of a casing piston, and to the coupling (9) connecting the intermediary shaft with the second drive. |
