Internal pollution preventing apparatus for handpiece

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

A - Human Necessities

61

C

A61C 1/05 (2006.01) A61C 1/00 (2006.01)

Patent

CA 2187607

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.

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