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:
Aug. 06, 1985
Filed:
Feb. 07, 1984
Takasuke Nakanishi, Kanuma, JP;
Nakanishi Dental Mfg., Co., Ltd., Kanuma, JP;
Abstract
An air driven dental handpiece has a turbine housing mounted on one end of a handle and an outwardly and upwardly tapered annular surface around the inner bottom surface of the housing. A turbine cartridge is removably mounted in the turbine housing and has an outwardly and upwardly tapered annular surface around the periphery of the bottom thereof abutting the tapered annular surface on the inner surface of the housing and an outwardly facing outwardly and downwardly tapered annular surface around the periphery of the top. An air turbine is rotatably mounted in ball bearings in the turbine cartridge, the turbine being resiliently mounted in the cartridge in the direction of the length of the turbine shaft. A head cap is threaded into the top of the turbine housing, and has a downwardly and outwardly tapered annular surface on the under side thereof abutting the downwardly and outwardly tapered annular surface on the upper end of the turbine cartridge for holding the turbine cartridge in a single fixed position in the turbine housing. One of said tapered annular surfaces in each pair of abutting tapered annular surfaces has an elastic sealing ring fitted in a slot therein and in sealing engagement with the other of the abutting pair of annular tapered surfaces.