Method and apparatus for reeving a hoisting cable
AssigneeWolffkran AG
InventorsWolfgang Ingelfinger, Ulrich Dörzbach
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Abstract
The invention relates to a method and to an apparatus for reeving a hoisting cable of a crane, wherein the load to be transported can be suspended from a lower hook block (3), which is held by the hoisting cable (12), from single-loom to double-loom and from double-loom to triple-loom mode, in which an auxiliary cable and/or a chain are utilized such that the weight of the lower hook block causes the hoisting cable to be pulled around the respective roller.
Claims26
A method for reeving a hoisting cable of a crane, in which a lower block is held by the hoisting cable, the lower block being configured to hold a load to be transported that is suspended from the lower block,
- wherein the hoisting cable is guided over a first jib cable pulley on a jib from a one-strand operating cable mode to a two-strand operating mode,
- wherein, in the one-strand operating mode, an end of the hoisting cable is detachably connected to the lower block, and
- wherein, in the two-strand operating mode, the hoisting cable is guided over a lower block cable pulley which has the lower block,
- wherein said method comprises:
- guiding a first end of an auxiliary cable over the lower block cable pulley, a second end of the auxiliary cable being configured to connect to the end of the hoisting cable over the lower block cable pulley,
- guiding the first end of the auxiliary cable over a second jib cable pulley on the jib,
- connecting the first end of the auxiliary cable to the lower block,
- letting down the lower block such that a weight of the lower block causes the end of the hoisting cable which is connected to the auxiliary cable to be pulled around the lower block cable pulley and to approach the jib as the lower block is let down further, and
- connecting the end of the hoisting cable to the jib.
A method for reeving a hoisting cable of a crane, in which a lower block is held by the hoisting cable, the lower block being configured to hold a load to be transported that is suspended from the lower block,
- wherein the hoisting cable is guided over at least one jib cable pulley on a jib from a two-strand operating mode to a three-strand operating mode,
- wherein, in the two-strand operating mode, the hoisting cable is guided over a first jib cable pulley and an end of the hoisting cable is connected to the jib,
- wherein said method comprises:
- pulling up of the lower block,
- connecting a first end of a chain to the lower block, the chain being connected by a second end of the chain to the end of the hoisting cable, and
- letting down the lower block, wherein the chain becomes tensioned and a weight of the lower block causes the end of the hoisting cable which is connected to the chain to be pulled over a second jib cable pulley.
An apparatus for reeving a hoisting cable of a crane, the apparatus comprising:
- a lower block held by the hoisting cable, the lower block being configured to hold a load to be transported that is suspended from the lower block,
- wherein the lower block comprises side walls and a lower block cable pulley, the lower block cable pulley having the lower block,
- a first jib cable pulley over which the hoisting cable is guided on a jib from a one-strand operating mode to a two-strand operating mode,
- a first axle on which the lower block cable pulley and a first circular-segment element are seated,
- a lower block reeving hook that is part of the circular-segment element,
- a second axle in which the lower block reeving hook engages, the second axle being secured to the lower block reeving hook by a detachable first axle securing device,
- an auxiliary link connected to the second axle and configured to be guided around the lower block cable pulley and around a second jib cable pulley on the jib,
- wherein the auxiliary cable has a first end configured to connect to the lower block and a second end configured to connect to a first end of the hoisting cable,
- wherein, in the one-strand operating mode, the end of the hoisting cable is detachably connected to the lower block,
- wherein, in the two-strand operating mode, the hoisting cable is guided over the lower block cable pulley having the lower block and is configured to connect to the jib,
- wherein, when the lower block is let down, a weight of the lower block causes the end of the hoisting cable connected to the auxiliary cable to be pulled around the lower block cable pulley and to approach the jib as the lower block is let down further.
Dependencies are inferred from the claim text.