| 摘要 |
A balanced-force wrench comprises a handle (1), a clutch jacket (14) connected to the handle, a driving rod (12) connected to the clutch jacket by using a force adjustment seat (5) and a connecting piece (11), and a working head (8) mounted at a lower end of the riving rod (12). An inner cavity of the clutch jacket (14) is connected to a balanced-force apparatus formed by a saw-toothed clutch upper body (8), a saw-toothed clutch lower body (9), and the force adjustment seat (5). When the balanced-force wrench loosens a bolt and a nut, the moment of force can be infinite, and when the balanced-force wrench tightens the bolt and the nut, the moment of force is unified and uniform. When the wrench is used to clamp a bolt and a nut disposed between a sleeper and a steel rail, the fracture of the steel rail due to an uneven internal stress can be avoided. |
