| 摘要 |
<p>The drive of the switchgear has a threaded spindle, driven by a motor (3) and a travelling nut (9) on the spindle (8), which engages a forked lever (11) coupled to the switch gear shaft. Between the motor and the threaded spindle is mounted a slip clutch (7). A limit switch (32), disconnecting the motor is actuated by the travelling nut. The limit switch actuation takes place when the nut has reached the end positions of the forked lever. The end positions of the forked lever are provided with stops. At these end positions the travelling nut still engages the spindle thread. The nut is preferably in the form of a ball nut. The slip clutch have a clamping device (19, 20) for adjusting its coupling effect, having a follower disc (16) between its discs with friction linings.</p> |
