| 摘要 |
A tool holder (1) comprises a house and a clamping mechanism (15, 23, 31, 32) provided therein, said clamping mechanism including a male member (15) adapted to engage in a female-like opening (12) in a tool (2). The male member (15) is movable to and fro between clamping and releasing positions by means of a piston device (14) that separates inner and outer hydraulic medium chambers (19, 20). A passage (36) extends through the piston device (14), said passage (36) emerging in said two chambers, a valve (37) being provided in said passage (36), in order to open the passage when the hydraulic pressure in the outer chamber (19) rises to a set limit value so as to maximize the force that clamps the tool. <IMAGE> |
