| 摘要 |
<p>The assembly (100) has a head (1) including a tube (11), a connection part, and an extension part (13) that is arranged around the connection part. A cylinder assembly (6) includes a set of set of cylinders (61, 62). A piston (41) is inserted in a movable manner in one cylinder. A chamber is defined inside one of the cylinders. A narrowed part (63) is arranged between the cylinders. The narrowed part is engaged with a sealing part (421) or cavity so as to form a watertight state. A valve (7) contacts an input of another cylinder.</p> |
