The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2003
Filed:
Feb. 13, 2002
Takasuke Nakanishi, Kanuma, JP;
Nakanishi Inc., Tochigi-ken, JP;
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.