| 摘要 |
Known locking mechanisms taking the form of double clutches are operated mechanically, with the clutches being released and engaged via a lever arrangement. These double clutches have the disadvantage of not being adjustable, because of the friction-caused wear on the clutches and on the lever linkage, and of the transmittable driving torque not being controllable, but rather given by the lever geometry. In addition, such double clutches have a large overall length. A double clutch with hydraulically operated clutches (7, 8) automatically re-adjusts the clutch play due to friction, and has the advantage that the driving torque to be transmitted by the driving clutch (8) is controllable, since the piston's (15) force of pressure depends on the pressure of the hydraulic fluid. In addition, such double clutches have a small overall length. Locking mechanisms of this kind are preferred for use in hoists, lifts and the like, in order to prevent the load sinking if the driving torque no longer acts.
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