| 摘要 |
The holder comprises a draw bar movable forwards and backwards in seat in block and in drawn-in position holding tool clamped relatively to holder. In the outwardly pushed position, the draw bar (7) permits the tool to be released. In the draw bar are formed outer and inner extension surfaces (10,11) with recesses (9) in which a cam component (12) engages. The cam component is in a rotary bar which is non-rotatively connected with a driver component which divides a hydraulic medium chamber into two part chambers communicating with first and second conduits. The conduits permit both feed of hydraulic medium to an individual part chamber and evacuation of medium from it. Via the driver component and the rotary bar the cam component is pressed either against the inner extension surface or the outer such surface, thereby moving the draw bar to either the clamping or freeing position. |
