A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
83/5
A61C 1/00 (2006.01) A61C 1/14 (2006.01)
Patent
CA 1238806
Improvements in a device for opening and closing a chuck for a dental handpiece ABSTRACT OF DISCLOSURE A device of this invention for opening and closing a chuck for a dental handpiece comprises a handle portion and a powerhead assembly including a driving shaft having, adjacent to its outer orifice, a forward outwardly tapering inner periphery defining a small caliber rear periphery and a large caliber front periphery. A cylindrical chuck having an axially hollow portion, a forward outwardly tapering outer periphery, a small caliber rear periphery and a large caliber front periphery, corresponding to the forward outwardly tapering inner periphery, the small caliber rear periphery, and the large caliber front periphery respectively, is slidably inserted into the axially hollow portion of the driving shaft. Three openings are radially formed at equally spaced portions around the forward outwardly tapering outer periphery of the cylindrical chuck. A disc-shaped chucking die having a diameter to fit into the radial opening is slidably inserted into the radial openings of the chuck to hold a dental tool. A chuck pusher is held into a socket with a disc plate spring interposed between the socket and the chuck pusher for axially displacing the chuck to hold or release the dental tool.
431707
Nakanishi Dental Mfg. Co. Ltd.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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