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:
Oct. 12, 1982
Filed:
Jul. 16, 1980
Takasuke Nakanishi, Kanuma, JP;
Nakanishi Dental Manufacturing Co., Kanuma, JP;
Abstract
An air-powered dental handpiece and a connecting means comprises a handle portion and a powerhead assembly. A sleeve bearing having a forwardly reducing cylindrical internal surface is integrally held into another end opening of the handle portion. The surface has three stepped annular space walls, and a central air supply passage and two axial passages for exhaust and water are provided to extend to the stepped annular space walls. An air supply pipe is fixedly inserted into the central passage and two pipes are fixedly inserted into two passages. A front portion of a connecting means is so formed into a forwardly reducing cylindrical plug as to fit into a socket of the sleeve bearing. The plug is provided with a top flat wall and two stepped annular space walls to form a neck journal, which is journaled in the sleeve bearing, thus bringing the top flat wall of the plug in close proximity to the innermost stepped wall of the sleeve bearing and two stepped annular walls of the plug in close proximity to the two stepped annular walls of the bearing respectively and communicating the passages of the plug with those of the bearing. A push-pull rod having a head at its outer end and a right angle hook at its inner end is put into a cylindrical casing of the plug by a dead spring, thus enabling a dentist to easily remove or reinsert a handle portion from or into the connecting means and also assuring smooth operation.