| 摘要 |
<p>The device (1) has working mass (4) driveable in a compacting manner, where the working mass is linearly movable back and forth via a crank mechanism, a piston (16) and a spring set (3) by a motor belonging to an upper mass (2). The spring set includes two springs (17, 18) i.e. compression springs, where one of the springs is compressible during a forward movement of the piston and the other spring is compressible during a backward movement of the piston. The latter spring is arranged within a free space inside the former spring. The piston exhibits a pot shape.</p> |
