| 摘要 |
A gripper comprises a tongs retaining means 4 mounted at one end of the gripper body 1, an actuating rod 2 for the tongs displaceable longitudinally within the body 1 and a pair of levers 6; 7, which constitute the gripper tongs, pivotable, on bearings 12; 13 arranged in the retaining means 4, by means of the actuating rod 2. An abutment 5 is provided on the retaining means 4 for limiting the travel of the rod 2 which is operated by means of a hydraulic cylinder having a control circuit 25. The levers 6; 7 are two-armed levers and are operatively connected to the adjacent end 3 of the actuating rod 2 by way of entraining elements 14; 15 which constitute length equalisation means. The actuating rod 2 is lockable in its operating position by the provision of a non-return valve 26 in the circuit 25. This construction provides advantages in manufacture and application by virtue of wider gripping tolerances and insensitivity to changes in temperature, impacts and to contamination by dust. <IMAGE> |
