| 摘要 |
PURPOSE: A rotating jack winch is provided to reduce the size of the winch and to compact a structure to be hung a large load. CONSTITUTION: A device for heaving in and paying out a chain by means of a hydraulic cylinder(5) which by means of gripping devices(2) engages the chain(11,12) and lifts or lowers the chain a given distance while the locking device(10) is deactivated. The structure comprises a frame(8) provided with a lower locking device(10), a chain wheel(6) guiding the chain(11,12), and an upper gripping device(2) mounted in a bracket(1) which is connected to the rod head of the hydraulic cylinder(5) and the central axle(7) of the chain wheel(6). The lower locking device is formed by two pawls(10) which are pivotally mounted on separate pins. These pawls(10) engage under a chain link(12) and hold it securely. The upper gripping device is formed by at least one pawl(2) which, together with a chain wheel(6) having pockets for the chain(11,12), engages under a vertical chain link(11). In order for the gripping device to be able to lift or lower the chain, the hydraulic cylinder(5) has a pivotal attachment(4) supported in the frame(8), and the end of its piston rod has a head that can be supported on the same pivot pin(3) as the pawl(2) of the gripping device, or on a separate pivot pin.
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