| 摘要 |
The lock piston is movable between a position locking the tool to the work machine and a position freeing the tool from the machine. The lock piston is movable between the two positions with the aid of a second piston-cylinder arrangement. The two piston-cylinder arrangements (41,42) are parallel-coupled for a common effect from a valve (40a) and a circuit forming part of the second piston-cylinder arrangement (42) incorporates a check valve (43) and an operating component (44) which in a first adjustment position couples together the cylinder spaces (47a,47b) on each side of the piston (47) in the second piston-cylinder arrangement. In a second adjustment position, it maintains the parallel-coupling via the check valve. A minus side (41b) forming part of the first piston-cylinder arrangement is directly coupled with a minus side (47b) forming part of the second piston-cylinder arrangement. |
