Dentsply Research & Development Corp.

Loreal Sa

Pacific Bioscience Laboratories, Inc.

David B Schumaker

Kenneth A Pilcher

Robert E Akridge

Carlton L Grim

A prophy angle having a single improved snap-in mounting shaft having an enlarged snap-through outer boss portion that is discontinuous in circumference for retaining the prophy cup rotor in permanent position and isolating the rotor from frictionally engaging other parts other than through the gearing except under stress, a press fit drive shaft retention locking sleeve that frictionally engages the housing when pressed into locking position, a reduction of the surface contact of the drive shaft with the inside of the housing by introducing vanes in contact with the housing wall rather than a continuous cylinder contact, and a closed vent hole with a hub on the drive shaft.

Growing community of inventors

Morristown, TN, United States of America

David B Schumaker