| 摘要 |
A self-releasing hook consisting of a bearing part attached by means of a load bracket on a hoisting mechanism, and counterbalances, and the bearing part comprises a double-hook grip and a curved groove made symmetrically relative to the horizontal passing through a hole centre, which houses a load bracket; the double-hook grip and curved groove are located on opposite sides of the vertical line passing through the center of said hole, and the ends of curved groove are located on said vertical, in addition, in the curved groove a movable counterbalance is located. |
