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, 1991
Filed:
Feb. 26, 1991
Takasuke Nakanishi, Kanuma, JP;
Nakanishi Dental Mfg. Co., Ltd., Tochigi, JP;
Abstract
A chucking device for a dental handpiece includes a dental bur having a retention groove, a stationary disk having a central opening, a pair of locking members having projecting engaging portions for engaging with the reaction groove, a retention spring for thrusting the locking members towards abutment with each other, and a pushbutton for releasing retention of the bur. When the bur is inserted into the central opening, the retention groove is engaged by the projecting engaging portions of the locking members for retaining and securing the bur within a bur tube. When the pushbutton is pressed down, the locking members are extended apart from each other to release the retention of the retention groove by the projecting engaging portions to permit the bur to be disconnected from the inside of the bur tube.