| 摘要 |
A tube is set between two shafts (2, 3) whose outer dia. comprises a soft rubber casing (5) and a harder plastic tube (9). Two curves (8) on a shaft (2) have two heel formations. - The feed-in heel formation presses the shafts together for emptying purposes and the other heel formation opens an intermediate space between the shafts for tube insertion or removal. |
