| 摘要 |
There is disclosed a clamping device primarily for clamping workpieces in production forming presses or other production tools which includes a toggle mechanism powered by an air cylinder or other power actuator and cooperating in tandem with a hand toggle mechanism; the hand toggle mechanism provides a short travel at a very high force for the moving one of a pair of clamping jaws. The hand toggle mechanism must be moved through its travel to a locked position to actuate the powered toggle mechanism and preferably a valve or other control for the power actuator is positioned to operate upon locking of the hand toggle mechanism. The hand toggle mechanism is spring biased to unlock and open after the locking force imparted by the power toggle mechanism has been released. The release of the power toggle mechanism is by a hand operated valve or a press operated valve so that manual opening of the clamping jaws is not required on the part of the operator.
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