Christel, Bean & Linihan
Seal for relatively rotatable parts
 A seal for sealing the clearance between a shaft and two close annular surfaces through which the shaft passes is in the form of a ring-like body having a central portion and two lip portions extending therefrom and hingedly movable thereto and which when the seal is mounted upon the shaft is placed in a deformed condition and in sealing engagement around the shaft. The body is of such cross-sectional shape that when stretched from an undeformed condition to a deformed condition about the shaft, each lip portion moves from a first angular position to a second angular position relative to the midplane of the body. When the seal is operatively placed upon a shaft so that each lip portion is placed in contact with a corresponding annular surface through which the shaft passes and each lip portion is thereby prevented from moving completely to its second angular position, the lip portions are axially biased into sealing engagement with the annular surfaces. 
F F
F16J F16J
inventional inventional
Robert A.
Kieffer