Handpiece having bearing protective member

Details Handpiece having bearing protective member Handpiece having bearing protective member

1994-05-17

1995-06-13

Ucchesi, Nicholas D.

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

433132, 415904, A61C 105, F03B 1304

Patent

active

054236789

ABSTRACT:
A dental handpiece contains a sleeve for rotatably accommodating and securing a dental treatment tool therein, bearings for rotatably holding the sleeve with respect to stationary handpiece casing members, a rotatable rotor fixed to the sleeve for rotating the sleeve under action of a compressed fluid, and stationary convexed and concave protective members for sheathing the bearings exposed to an annular spacing defined by the bearings and the rotatable rotor. The rotatable rotor contains rotatable concave and convexed disc portions. The rotatable concave and convexed disc portions are arranged in proximity to the stationary convexed and concave protective members in a mating relation therewith for defining therebetween at least a first gap and a second gap communicating with the first gap and disposed radially outwardly of the first gap.

REFERENCES:
patent: 3132426 (1964-05-01), White
patent: 3451134 (1969-06-01), Erikson et al.
patent: 4021919 (1977-05-01), Lingenhole et al.
patent: 4219330 (1980-08-01), Jaremus
patent: 5074788 (1991-12-01), Nakanishi
patent: 5252065 (1993-10-01), Nakanishi

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