| 摘要 |
PCT No. PCT/SE96/01663 Sec. 371 Date Jun. 9, 1998 Sec. 102(e) Date Jun. 9, 1998 PCT Filed Dec. 16, 1996 PCT Pub. No. WO97/24533 PCT Pub. Date Jul. 10, 1997The invention relates to a hydraulic unit for feeding an object at a desired feed speed a distance in a given feed direction during a working stroke and, in a return stroke, bringing the object back to the initial position at a considerably greater return speed, comprising a double-acting working cylinder (1) with a piston (16), the piston rod (17) of which is connected to the object which is to be moved, and a receiver cylinder (2) which is provided with a second piston (28) and designed to be filled with oil from the working cylinder during the return stroke, the first piston (16) and the second piston (28) being interconnected by a rigid connecting member (31) which forces the second piston to follow the movements of the first piston. |
