Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1998-06-24
1999-06-15
Howell, Daniel W.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
279 51, 279125, 433129, A61C 114
Patent
active
059115785
ABSTRACT:
A head assembly for a medical handpiece includes a head housing and a rotor spindle contained in the housing. The spindle defines a longitudinal through-bore with an internal screw thread. An adjustable chuck is received within the through-bore of the spindle and has a complementary external screw thread adapted for mating with the internal thread of the spindle. The chuck has a top opening forming a keyway and a bottom opening adapted for receiving and holding a bur. A chuck key is attached to the housing, and includes a hand grip at its top end for being manipulated by a user and a chuck engaging bottom end. The chuck key is axially moveable between an operative position and an inoperative position. Upon rotation of the chuck key in the operative position, the chuck threadably moves relative to the spindle to an open position for receiving and removing the bur. Upon counter-rotation of the chuck key in the operative position, the chuck threadably moves relative to the spindle to a closed position for adjustably tightening around the bur. Upon rotation of the chuck key in the inoperative position, the chuck is immovable.
REFERENCES:
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patent: 3960039 (1976-06-01), Nash et al.
patent: 4015335 (1977-04-01), Nash
patent: 4015489 (1977-04-01), Lieb et al.
patent: 4493645 (1985-01-01), Nakanishi
patent: 4536157 (1985-08-01), Maizenberg
patent: 5040980 (1991-08-01), Heil
patent: 5542846 (1996-08-01), Quinn
Howell Daniel W.
Smith Monica
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