| 摘要 |
A dental handpiece (10) of the type having a rotary member supported by at least one bearing assembly (13, 14), wherein said at least one bearing assembly (13, 14) has an annular retainer (21) and a plurality of balls (20) at least partially supported by said annular retainer (21), characterized in that the annular retainer (21) rollingly supporting the balls (20) within ball apertures (23) and having at least one hole, aperture, depression, detent, dimple, cut, void, or slice upon any external surface of said annular retainer (21) for providing a place for excess amounts of grease and facilitating the physical retention of grease in proximity to contacting parts. |
