| 摘要 |
A gripper for petroleum pipes, the gripper including a housing and two gripper arms. The gripper arms are provided, at end portions, with gripping surfaces and are pivotable, at opposite end portions, around respective first axes. Each of the gripper arms is connected to the housing by respective first pivotal links, each of the first pivotal links being pivotably connected to the respective gripper arm around a second axis which is between the gripping surface and the first axis. Each of the first pivotal links is pivotably connected to the housing around a third axis, and each of the gripper arms is connected to the housing by a respective second pivotal link around the first axis. Each of the second pivotal links is pivotably connected to the housing on respective fourth axis fixed relative to the housing, the two first pivotal links being independently pivotable. |
