A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
83/2
A61C 19/00 (2006.01) A61C 1/00 (2006.01)
Patent
CA 1105745
ABSTRACT System for the control of the supply of air under pressure and of water to at least one dental handpiece,particularly to a drill activated by a turbine, of the type which includes the first commutating valve placed in the circuit between the handpiece and the source of air under pressure, which would connect the latter (source) when a first pedal is depressed and, for every handpiece, a first intercepting valve placed down-stream from said first commutating valve and a second intercepting valve inserted in the cir- cuit which connects the handpiece to the source of the water supply, which can be operated only when the respective handpiece is removed from the cor- responding support, and including finally a second pedal whose activation causes the opening of said intercepting valve, characterized by the fact that it includes, for each handpiece a servopneumatic mechanism which will open if supplied by air pressure, said second intercepting valve; said servo- pneumatic mechanism being capable of being connected with the source of air under pressure by depressing said second pedal to open an auxiliary commut- ating valve which normally connects with atmosphere the access of a second auxiliary intercepting valve, normally closed, which opens under the action of air pressure when the air is allowed to flow to the handpiece by operat- ing said first pedal to connect said first intercepting valve with the source of air under pressure through said first commutating valve.
311810
Neri Vincenzo
Smart & Biggar
LandOfFree
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