Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1979-07-23
1981-09-29
Mancene, Gene
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
433115, 279 1Q, A61C 114
Patent
active
042920272
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.
REFERENCES:
patent: 1678097 (1928-07-01), Andresen
patent: 1837938 (1931-12-01), Young
patent: 2005849 (1935-06-01), Skinner
patent: 2469261 (1949-05-01), Cooper
patent: 3098299 (1963-07-01), Page
patent: 3293402 (1966-12-01), Graham
patent: 3426429 (1969-02-01), Hoffmeister et al.
patent: 3542372 (1970-11-01), Edwardson
Mancene Gene
Wilson John J.
Young Dental Manufacturing Co.
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