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:
Sep. 29, 1981
Filed:
Jul. 23, 1979
George E Richmond, Ladue, MO (US);
Young Dental Manufacturing Co., Hazelwood, MO (US);
Abstract
A collet of somewhat flexible plastic for holding a dental tool in a dental handpiece, has an inner body which fits within a socket in the burr tube of the handpiece, and at its outer end extends outwardly into a hub and then rearwardly into a cylindrical skirt which fits between the outer surface of the bearing for the burr tube and the inner surface of a counterbore in the handpiece. Centrifugal force caused by rotation of the burr tube flares the skirt outwardly against the counterbore surface to provide a seal therebetween. In a modification the skirt slants outwardly to contact the counterbore surface when the skirt is stationary. A modified skirt tapers from its connection to the hub to the skirt end. In another modification, the collet has a bore in its inner end, with the handpiece end cap, the driven gear and the burr tube having bores aligned with the collet bore so that a burr extractor pin can extend through the bores to push the dental tool out of the collet. The extractor pin in one form has a flat head, and in another form has a looped end for insertion of a finger.