| 摘要 |
An annular wiper for piston rods, disposed in a cylindrical wall opening wherein an axially movable piston rod is running, comprises a reinforced ring of an elastic, somewhat flexible material having a portion with an inner diameter slightly greater than the outer diameter of the piston rod and an axially outwardly projecting and radially inwardly projecting lip with a somewhat smaller inner diameter than the outer diameter of the piston rod. The reinforcement comprises a first annular portion surrounding the periphery of the elastic ring, creating a torque center line for the resilient ring, and a second annular portion absorbing as a compressive force the radially inwardly directed force exerted by the elastic ring as it turns around the torque center line.
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