Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Driven positioning mean
Patent
1991-01-16
1992-06-30
Focarino, Margaret A.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Driven positioning mean
B66C 134
Patent
active
051257076
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to improvements in or relating to a load lifting hook device, and particularly to a hook device wherein a load lifting hook is constructed such that it can be rotated by remote operation so as to perform an efficient load lifting operation.
2. Background Art
FIG. 6 is a sectional structural view showing an example of a hook device for a well known conventional load lifting apparatus. In the figure, reference numeral 1 denotes a load lifting hook (hereinafter referred to only as hook), and 2 a hook block on which the hook 1 is supported vertically for rotation using; for example, a thrust bearing 3. The hook block 2 is held by holding frames 2a on a shaft 4b on which sheave wheels 4a are normally supported for rotation. Then, the hook block 2 is constructed wherein the hook 1 is positioned vertically for rotation thereon as described above. The hook block 2 is moved up or down following a sheave block 4 which is formed by the sheave wheels 4a and the shaft 4b. Wire ropes 5 slung to a load to be lifted are engaged with the hook 1, and the load is lifted by winding up the sheave block 4 so that transportation to a predetermined location can be performed.
By the way, the necessity for changing the direction of a lifted load during such a transporting process often arises. Further, it is necessary to finely control the direction of a lifted load also when it is to be placed down with a predetermined piece of equipment or to a particular site. Further, provision of a jig (hereinafter referred to as a lifting jig) of the exclusive use for performing such slinging as described above automatically, in short, only by an operator of a crane without requiring a slinging operator has only been attempted in recent years. When using such a lifting jig, it is necessary to control the direction of the jig in accordance with the load to be lifted. While such a direction control is possible by rotating the hook 1, conventionally, it is a common practice that the rotation operation is performed manually by an operator of the load to be lifted or the lifting jig. Consequently, having of an operator for such a rotating operation is inevitable, and no power saving can be achieved particularly even by provision of the lifting jig or the like.
In addition, means for automatically rotating the hook 1 to solve the problems described above have been conventionally proposed, for example, in the official gazette of Japanese Patent Laid-Open Application No. 141288/1981, the official gazette of Japanese Utility Model Laid-Open Application No. 88083/1984. and so forth. In particular, the means of the official gazette of Japanese Patent Laid-Open Application No. 141288/1981 includes a small gear directly coupled to a motor which is disposed on a hook block described above while a large gear is provided on a hook such that the hook may be rotated by rotating the motor. Similarly, the means of the official gazette of Japanese Utility Model Laid-Open Application No. 88083/1984 incorporates a hook that is rotated by a well known combination of a worm and a worm wheel.
However, such means which employ a gear have such problems as described below constitute serious obstacle to putting such devices into pratical use. In particular, such problems that include the hook rocking as a result of impact or oscillations when a load is lifted or of oscillations or the like from a lifting apparatus in a load-free condition wherein no load is lifted. Against such rocking motion, movement of the hook block in a vertical (thrust) direction y is naturally restrained by a thrust bearing as described hereinabove. However, a structure is normally employed which permits some movement in a radial direction x. Where such a structure is employed, economical designing is enabled which does not make the hook block or hook or some other hook supporting members greater than necessary. However, where a rotary device which employs a gear as described above is adopted for a hook block of such a structure, the meshing en
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Chaen Yoshinobu
Kameyama Kazuhide
Focarino Margaret A.
Kramer Dean J.
Sankyu Inc.
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