| 摘要 |
A self-releasing hook consists of a load-bearing part with a sloping curved slot hung by a load bracket on a hoisting device and pivotally fastened to the load-bearing part, a counterweight with an additional counterweight, which is characterized in that on the counterweight a stop is mounted regulating the angle of inclination α of a longitudinal groove to the horizon and a load-bearing part of a self-releasing hook is designed so that its center of gravity is located from the side of the additional moving counterweight and the angle of inclination α of the longitudinal groove of the counterweight to the horizon is smaller than the angle &bgr; between the vertical and the line passing through the center of the circle forming an inner part of a gripping bracket of self-releasing hook, and the point of its turning around the lower part of load bracket. |
