Hook device and crane

Abstract

The present invention provides a hook device provided with a plurality of locking parts and capable of automatically adjusting the relative position between the hook device and the center of gravity of cargo. The hook device includes: a central shaft extending in a first direction; and a first locking portion and a second locking portion disposed across the central shaft in a second direction perpendicular to the first direction. The first locking part and the second locking part are connected to each other in a state that they cannot independently rotate around an axis extending in a first direction but can rotate around an axis extending in a third direction different from the first direction and the second direction. central axis.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2018-142844 filed on July 30, 2018. The entire contents of this Japanese application are incorporated herein by reference. technical field [0002] The invention relates to a hook device and a crane equipped with the hook device. Background technique [0003] Conventionally, a crane has used a hook block combining a plurality of hooks. A hook block with a plurality of hooks has the advantage that a part of the hooks can be used to lift a low-load load or all hooks can be used to lift a high-load load, which can be used in a wider range of applications. [0004] As an example of such a hook tackle, Patent Document 1 discloses a hook tackle including: a pulley housing connected to a rope hanging from the boom of a crane; The state is supported by the pulley housing; and the two double-hook hooks are supported by a pair of plates in a state capable of rotating around the horizontal axis and the p...

AI Technical Summary

Problems solved by technology

However, properly adjusting the relative position between the double-hook hook and the center of gravity of the cargo requires considerable skill, especially difficult on a construction site with limited personnel and time

[0007] Furthermore, if the cargo is lifted with the center of gravity shifted from directly below the shaft of the double hook, a bending load will be applied to the double hook, causing the double hook to strongly rub against the thrust bearing.

As a result, there is a possibility that the smooth rotation of the double hook hook is hindered and the shaft of the double hook hook cannot withstand the bending load and may be broken.

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