| 摘要 |
A clamp having a first leg, a second lega and a base connecting the first and second leg together. An anvil on the first leg and an opening in the second leg. A threaded bolt having threads extending through the opening. A striker head at one end of the threaded bolt which is opposite to and faces the anvil. A control box in the second leg communicating with the opening. A control block mounted within the control box. The control block having teeth extending therefrom which face the threads in the threaded bolt. A control mechanism is provided for moving the control block from a position in which its teeth engage and mesh with the threads on the threaded bolt to a position in which its teeth are disengaged from the threads on the threaded bolt.
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