| 摘要 |
A clamping apparatus includes two pairs of rotatable and substantially cylindrical clamping elements positioned on jaws of the clamping apparatus. One pair of clamping elements is located on a fixed jaw, and the second pair is located on a movable vise jaw. The jaws are supported on a generally rectangular base which has a pair of end portions. One end portion is a first upstanding flange formed integrally with the base. The second end portion is the fixed jaw. A two-way threaded rod is carried by the movable vise jaw and one threaded end extends through a cooperating threaded recess in the first upstanding flange. The movable vise jaw has a transverse notch located in its bottom to receive a hollow cylindrical nut which is internally threaded in a first direction. Adjacent to the cylindrical nut is a friction ring. The second threaded end of the threaded rod, threaded in the second direction, is threaded into the cylindrical nut. There are two speeds for moving the movable vise member towards the fixed member. One speed of movement occurs when the clamping members are not in engagement with the workpiece. The second speed of movement occurs when the clamping members are engaging the workpiece.
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