| 摘要 |
The freezing chamber of a frozen or semi-frozen confection freezer has a mixing rotor having a shaft which extends through an opening in a wall. The seal between the shaft and wall comprises an elastomeric cup having a rim engaged with the wall about said opening. The cup has a hub engaged with the shaft and a yieldable skirt between the hub and the rim. The hub has a socket which receives a metal ring with an oblique wear surface. An O-ring is engaged between a fillet on the shaft and the oblique wear surface on the ring whereby the cup is self-centering with respect to the shaft, notwithstanding any tendency of the shaft to nutate.
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