Abrading – Machine – Rotary tool
Reexamination Certificate
2006-10-16
2008-09-09
Grant, Alvin J. (Department: 3723)
Abrading
Machine
Rotary tool
C451S287000, C451S338000
Reexamination Certificate
active
07422514
ABSTRACT:
A dental crown polishing apparatus has a motor, a ball bearing assembly around a shaft of the motor and having balls rotating and circularly moving around the motor shaft by receiving torque from the motor shaft, a brush assembly on the periphery of the ball bearing assembly, equipped with brushes contacting the ball to rotate and having bristles in the same direction as an axial direction of rotation and a tray opposite and open to the brush assembly to dispose a crown toward the brushes. The motor shaft is offset from the center of the brush assembly. The brush assembly moves in an orbital fashion by the rotation of the motor. The tray rotates separately from the brush assembly. The rotation of the tray is not synchronous with the rotation of the brush assembly. Dental crown polishing is achieved by the orbital movement of the brushes.
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Grant Alvin J.
Harness & Dickey & Pierce P.L.C.
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