专利名称：THRUST BALL BEARING CONSTRUCTION
FOR TRAILER JACK
发明人：DOUGLASS B,US申请号：US41100373申请日：19731030公开号：US3851855A公开日：19741203
摘要：A thin hard upper washer of spring-steel hardness is deformable enough topermit its being brinnelled by rolling contact with a set of bearing balls, so thatserviceable raceways are thereby defined in the soft bearing cap welded to the upperend of the jack.
申请人：ATWOOD VACUUM MACHINE CO,US
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