Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1997-07-24
1998-11-17
Wilson, John J.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
415904, A61C 114
Patent
active
058367667
ABSTRACT:
A handpiece having a releasable retaining device for a tool having a shaft about which the tool rotates. The handpiece has a housing and a drive sleeve rotatably mounted in the housing. The drive sleeve has a hollow cylindrical insertion hole into which the shaft of the tool is placed. A drive means is provided for rotation of the drive sleeve. First and/or second releasable couplings are provided for rotatably and/or axially connecting the shaft to the drive sleeve. The releasable couplings have either a coupling slider or pressure member which is displaceable between coupling and decoupling positions. An actuating device is provided for displacing the coupling slider or pressure member into their decoupling position. In one embodiment the coupling slider is made of a ceramic material and fabricated into its final form by means of a single fabrication process without after treatment. In another embodiment the coupling slider is made from a ceramic material, and a ring-shaped spring (urging the coupling slider into its coupling position) has ends separated by a distance. The coupling slider has two peripheral grooves on a side opposite a free end of the coupling slider, in which grooves the ends of the ring-shaped spring are disposed. In a third embodiment, the pressure member is fabricated from a ceramic material and has a color mark on a visible surface formed by coloring the ceramic material.
REFERENCES:
patent: 4773856 (1988-09-01), Mosimann
patent: 4874314 (1989-10-01), Fleer et al.
patent: 4966552 (1990-10-01), Gonser
patent: 5022857 (1991-06-01), Matsutani et al.
patent: 5312252 (1994-05-01), Abbott
Gugel Bernd
Kuhn Bernhard
Kaltenbach & Voigt GmbH & Co.
Wilson John J.
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