Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1984-08-02
1986-06-17
Wilson, John J.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
279 57, A61C 114
Patent
active
045953635
ABSTRACT:
A device for opening and closing a chuck for a dental handpiece has a handle portion and a powerhead assembly including a hollow driving shaft having, adjacent to its outer orifice, a forwardly outwardly tapering portion defining a small diameter rear portion and a large diameter front portion. A hollow cylindrical chuck has a forwardly outwardly tapering outer peripheral surface joining a small diameter rear surface and a large diameter front surface corresponding to the respective driving shaft portions. The chuck is slidably inserted into the driving shaft. Three radial openings are formed at equally spaced positions in the forwardly outwardly tapering outer peripheral surface of the cylindrical chuck. A plate-shaped chucking die having a concave bottom surface is slidably fitted into each radial opening to hold a dental tool. A chuck pusher is held in a socket member with a disc plate spring interposed between the socket member and the chuck pusher, and the pusher is movable for axially displacing the chuck to hold or release the dental tool.
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Nakanishi Dental Mfg. Co. Ltd.
Wilson John J.
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