| 摘要 |
PURPOSE:To improve the efficiency in the heavy article hoisting work by installing a demountable type opening/closing hook which can be separated on the top edge of an expandable arm and hoisting the opening/closing hook and the heavy article by a cable after the heavy article is nipped by the opening/closing hook. CONSTITUTION:When a heavy article 20 is hoisted, said heavy article 20 is certainly caught by a demountable type opening/closing hook 8, and the hydraulic pressure in a hydraulic cylinder 14 is discharged through a vent valve. After the hydraulic pressure is discharged, a ratchet 13 is fitted with the hook of a ratchet wheel 12, and the free turn is restrained, and the opening/closing hook 8 is locked in the heavy article 8 holding state. When a diving machine 1 retreats a little, the demountable type opening/closing hook 8 is pulled, and a supporting shaft 22 pushes a pin pressing element 11, and the supporting shaft of the demountable type opening and closing hook 8 is slipped off from the top edge of an expandable arm. Therefore, the heavy article can be hoisted by taking up a cable 9 by a cable reel.
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