| 摘要 |
The vise includes a seat body having two movable jaws separately with two inner threads, a fixed jaw and a rail. A screwing rod has a rear portion and a front portion whose diameter is less than the rear portion. A first outer thread is formed on the rear portion. A step is formed between the front portion and the rear portion. A screwing tube telescopically and unrotatably sheathes the front portion of the screwing rod and has a second outer thread. The two movable jaws are separately engaged with the screwing tube and screwing rod by screwing the outer threads and the inner threads. A spiral direction of the first outer thread is contrary to the second outer thread. A main spring is nipped between the screwing rod and screwing tube. A crank is axially connected to the front portion of the screwing rod for rotating the screwing rod. |
