| 摘要 |
The device has a chamber (3) filled with balls and provided in a movable part (1). A movable part (2) engages between the balls and is firmly held in the part (1) by the balls. The volume of the chamber is increased by adjusting a limiting wall of the chamber, such that the part (2) moves by rearranging the balls for adjusting both the parts (1, 2). The limiting wall extends parallel to a ball layer (4). |
