| 摘要 |
The cylinder (10) is vented outwardly in the interior of the diaphragm cylinder by a vent (29) which allows the intrusion of dirt and moisture. The diaphragm cylinder interior is isolated from the guide tube interim (12) by an annular sealing ring or spaced rings (31) seated between the guide tube (12) and the piston rod (14) and sealing the annular chamber (9). The ring is rigidly seated either on the piston rod (14) or in the guide tube (12) and has a resilient annular sealing portion (34) in the form of a sealing lip which lies against the internal circumferential surface (35) of the guide tube (12) or against the outer circumferential surface of the piston (14) under pressure by virtue of a certain amount of over-dimensioning and is thereby resiliently deformable and has a wiping-off ability. The ring has an arcuate or tapered tip. <IMAGE> |
