Cutlery
Patent
1980-03-21
1982-03-23
Skudy, R.
Cutlery
308 9, 433120, F16C 3906
Patent
active
043209270
ABSTRACT:
In a preferred embodiment, a magnetic air turbine dental drill having bearing function is achieved by spaced-apart annular magnets having therebetween in spaced-apart relationship an intermediate annular third magnet with the magnetic poles of the three magnets aligned coaxially and with magnetic poles of the intermediate third magnet being positioned in opposing like-pole repelling relationships to spaced-apart juxtaposition poles of the first and second magnets, and the third magnet as an annulus having upper and lower concavely shaped faces substantially seated in a lower convex face of the first magnet of annulus shape and in an upper convex face of the second magnet of annulus shape, third magnet being fixedly mounted onto and revolvable with a coaxially aligned shaft extending through the apertures of the first and second annuluses in spaced-away relationship therefrom, resulting in angular opposing faces of the magnets exerting both axial and transverse stabilizing forces in stabilizing the shaft, utilizing cobalt magnets.
REFERENCES:
patent: 3493275 (1970-03-01), Stone
patent: 3900952 (1975-08-01), Landgraf
patent: 3958842 (1976-05-01), Telle
patent: 4072370 (1978-02-01), Wasson
patent: 4128280 (1978-12-01), Purtschert
patent: 4153993 (1979-05-01), Kataoka
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