Dental handpiece with angular contact ball bearings
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United States of America Patent
Stats
-
Jul 29, 2003
Grant Date -
Aug 15, 2002
app pub date -
Feb 13, 2002
filing date -
Feb 13, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A dental handpiece is disclosed, which includes a burr sleeve, upper and lower ball bearings for rotatably supporting the burr sleeve, a rotor fixed to the burr sleeve between the upper and lower ball bearings and rotated for rotatably driving the burr sleeve, and a dust controller. The dust controller includes a rotary protruding member fixed on the outer surface of the burr sleeve and rotating integrally with the burr sleeve, and a stationary protruding member attached to a stationary part of the handpiece and having a surface facing to the rotary protruding member to define a gap therebetween located outside of the lower ball bearing. The upper and lower ball bearings are angular contact ball bearings each having a bearing cage. The bearing cage has apertures that support bearing balls therein and are located in the middle of the bearing cage in the thrust direction.
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