| 摘要 |
<p>(57) The invention is concerned with a winch device which comprises a working rope to be wound in onto a reel of its own for pulling or lifting a load as well as a control rope, likewise to be wound in onto a reel of its own, for controlling the operation of the winch. The invention is in particular concerned with a method for controlling the operation of the winch so that the working rope and the control rope are wound in, and can be wound out, respectively, in the same direction and at the same speed. According to the invention, this is accomplished so that a tendency is produced in the control rope to be pulled in, that the winding-in of the working-rope reel is caused by allowing the control rope to be pulled in over a certain advance distance relative the working rope, and that the speed of winding-in of the working rope is restricted, or the winding-in of the working rope is stopped, respectively, by restricting the winding-in of the control rope relative the winding-in of the working rope. In a winch device for carrying out the invention, the operation has been accomplished by means of friction couplings (15,29) that receive drive power as well as by means of rotational wedge members (4,32) controlling their connecting and disconnecting, respectively, the axial state of expansion of the said rotational wedge members being adjusted by means of the said relative ratio of movement of the control rope (45) and the working rope (48). (Fig. 1)</p> |
