Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1993-01-13
1994-08-02
O'Connor, Cary E.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
415904, A61C 105
Patent
active
053340132
ABSTRACT:
A high speed dental drill includes a drill head having a housing including a bottom and a cavity, and a turbine assembly mounted in the cavity for supporting a dental tool extending outwardly from the bottom of the housing, the turbine assembly including a rotor shaft and an annular turbine drive mounted thereon. The outer surface of the annular turbine drive has blades with an outer shape of a substantially inverted D-shaped chordal segment cut out therefrom so that rotation of the rotor shaft occurs at high speed when air impinges against the part-circular cut-away surfaces of the blades. Bearing assemblies rotatably support the shaft of the turbine assembly, and an exhaust is provided for exhausting air from the turbine assembly out of the bottom of the housing and to create and maintain positive air pressure in the housing, even during turn off of the drill, so as to prevent liquid from being drawn up into the housing, the exhaust including an exhaust hole in the bottom of the housing and an exhaust channel formed in the housing for supplying air to the exhaust hole from the turbine assembly. An elongated handle is connected with the housing, and has an air conduit in communication with the cavity of the housing for supplying pressure air against the turbine assembly, and a water conduit for supplying water under pressure through a water spray hole in the housing so that a water spray impinges upon the drilling tool during use.
REFERENCES:
patent: Re30340 (1980-07-01), Borden
patent: 3120705 (1964-02-01), Hoffmeister et al.
patent: 3298103 (1967-01-01), Maurer
patent: 3306375 (1967-02-01), Macks
patent: 3380162 (1968-04-01), Heathe
patent: 3381378 (1968-05-01), Lawrence
patent: 3408043 (1968-10-01), Williams et al.
patent: 3418715 (1968-12-01), Ellis
patent: 4146964 (1979-04-01), Lares et al.
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