Dental handpiece

Details Dental handpiece Dental handpiece

1983-11-03

1985-06-04

Wilson, John J.

Dentistry

Apparatus

Having intra-oral dispensing means

433126, A61C 110

Patent

active

045211892

ABSTRACT:
A dental handpiece includes two hollow casings arranged to swivel with respect to each other about an axis. A hub connected to one casing has a carefully finished exterior surface that has a close fit with a surrounding interior surface on the other casing. Various grooves around the hub are supplied with turbine drive air, with water and with auxiliary air. Registering ports in the other casing conduct these fluids to the vicinity of an air turbine at the end of the other casing. No O-rings or comparable seals are used between the fluid connections at the hub, but the positioning of the several grooves and ports and the relative pressures of the fluids are arranged so that any minor leakage is not harmful.

REFERENCES:
patent: 4173827 (1979-11-01), Austin, Jr.
patent: 4353697 (1982-10-01), Nakanishi
patent: 4403959 (1983-09-01), Hatakeyama

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