Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1987-11-17
1989-09-05
Wilson, John J.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
A61C 114
Patent
active
048633810
ABSTRACT:
The improved dental handpiece comprises an operating sleeve slidably mounted on an outer circumference of the rotor shaft, said operating sleeve being formed with a flange, a spring for normally biasing the operating sleeve frontwardly, an operation collar threadedly engaged with an outer circumference of the outer cylinder, a pusher ring interposed between an inner surface of the operation collar and a front surface of the flange of the operating sleeve, a cylindrical portion formed at a front portion of the rotor shaft for receiving the main shaft of the working tool, a plurality of key holes formed through a wall of the cylindrical portion at a position opposed to an inner surface of the operating sleeve in such a manner as to be arranged at equal intervals on the same circumference, each of said key holes having a segment-like shape in cross section, a plurality of chuck keys engaged in the key holes, each of said chuck keys having a shape corresponding to the shape of each key hole in such a manner that an upper surface of each chuck key is formed with a frontwardly diverged inclined portion projectable from the outer circumference of the cylindrical portion of the rotor shaft.
REFERENCES:
patent: 222181 (1879-12-01), Donaldson
patent: 3994070 (1976-11-01), Loge
Ushio Kogyo Co., Ltd.
Wilson John J.
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