| 摘要 |
A protective device of hoisting cranes comprises on a rail of track a grip made of two connected parts, a roller attached on the grip. It has a rack, elastic shock absorbers are located from both side of the rail, a toothed gear is fastened on the body with possibility of engagement with the rail, a shaft is fixed on the axle of toothed gear and is located in the cylinder with hydraulic fluid, disks with blades are attached inside the cylinder to the shaft. |
