Internal pollution preventing apparatus for handpiece

Details Internal pollution preventing apparatus for handpiece Internal pollution preventing apparatus for handpiece

1996-08-01

1998-09-01

Lucchesi, Nicholas D.

Dentistry

Apparatus

Including activator or regulator for controller or drive

A61C 102

Patent

active

058001700

ABSTRACT:
The invention provides an internal pollution preventing apparatus for a handpiece wherein a valve itself is small and compact and a housing is small in size and which is small in number of parts and superior in assembling facility, airtightness and economy.
The apparatus has an air turbine drive air circuit A for supplying, when the handpiece operates, air of a comparatively high pressure via a valve 1, an exhaust air circuit D for exhausting air after having driven an air turbine of the handpiece, a chip air circuit B for supplying air for the atomization of cooling water via valves V1, V2, V3, V4 and V5, and a low pressure air feeding circuit E for feeding air turbine stopping and circuit internal pressure keeping air of a low pressure to the drive air circuit and the chip air circuit via further valves. An exhausting change-over valve V6 for opening and closing the exhaust air circuit with respect to the atmospheric air is provided in the exhaust air circuit D in such a manner as to be directly opened or closed by a pilot pressure in the drive air circuit A or the chip air circuit B. The apparatus is characterized in that each valve is formed in a mushroom shape.

REFERENCES:
patent: 3237306 (1966-03-01), Staunt
patent: 4443195 (1984-04-01), Matsui
patent: 4797098 (1989-01-01), Kawata
patent: 5295829 (1994-03-01), Frey et al.
patent: 5464350 (1995-11-01), Bierbaum

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