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. 17, 1984
Filed:
Sep. 23, 1982
Toshimasa Nakanishi, Kanuma, JP;
Nakanishi Dental Mfg. Co., Ltd., Kanuma, JP;
Abstract
A dental handpiece having a handle portion, a powerhead assembly integrally and perpendicularly linked to the handle portion, a holding sleeve fixedly inserted in the handle portion, a driving shaft journaled in a bushing in the holding sleeve, the driving shaft including an integral disc at its outer end, the outer end surface of the integral disc being concave, the concave surface carrying at its periphery a guide pin which is directed toward the point of intersection of the axis of the driving shaft and that of a cylindrical hollow driven shaft having a spherical middle portion, the cylindrical driven shaft being rotatably mounted in the powerhead assembly in bushings, the spherical middle portion of the cylindrical driven shaft having a longitudinal concave guide slot and the guide pin being slidably inserted into the longitudinal concave guide slot to couple the driving shaft with the cylindrical driven shaft, and a dental tool on the cylindrical driven shaft, whereby the dental tool is driven so as to rotate in one direction and in the opposite direction alternately by the circular rotation of the driving shaft.