Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1995-11-21
1998-03-31
Lewis, Ralph
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
A61C 105
Patent
active
057331200
ABSTRACT:
There is provided a dental handpiece capable of stably supporting a turbine during high-speed rotation thereof. A projection is provided at each corner portion of a polygonal end surface of a retainer. The projections prevent a conical spring washer from deviating from a centered position relative to the central axis of the turbine. First and second ball bearings for supporting the turbine are axially pressed with a sufficient force which is symmetrical about the central axis of the turbine. A sufficient axial pre-load can be applied to the first and second ball bearings by the conical spring washer, and the conical spring washer is prevented from being displaced.
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Mukasa Masahiro
Yao Atsushi
Koyo Seiko Co. Ltd.
Lewis Ralph
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