Patent ID: 9610136
Date: 2017-04-04
CPC Classifications: A61C

Claim:
1. A device for the controlled supply of compressed air to at least one pneumatically operated dental instrument from a supply and control unit wherein the at least one pneumatically operated dental instrument is connected by a compressed air supply hose with a valve mechanism in the supply and control unit, the valve mechanism comprising: a plurality of pneumatic sliding valve units, the plurality of pneumatic sliding valve units of the valve mechanism is accommodated in one valve body, the one valve body having a single monolithic one-piece construction, the one valve body comprises a plurality of control inputs and valve bores, and each of the plurality of pneumatic sliding valve units corresponds to one of the plurality of control inputs, the plurality of control inputs are connected to openings of valve bores of the one valve body, whereby pressurization of one of the plurality of control inputs with switching compressed air opens a corresponding one of the plurality of pneumatic sliding valve units and locks all additional pneumatic sliding valve units in a closed state, wherein for providing pneumatic switching paths within the one valve body for controlling the sliding valve units, the valve bores are connected with each other via a first connection bore in an upper valve body half and a second connection bore in a second valve body half, wherein the second connection bore is provided for a supply of continuous compressed air to the valve bores, and wherein each of the sliding valve units comprises a first piston section and a second piston section having a plurality of section-wise different piston diameters and a plurality of circumferential grooves, and the second piston section is provided with first and second bores, the first and second bores extend perpendicular to one another and constitute a part of a valve path, the valve path is open from the control input via the first and second bores to the first connection bore when a sliding valve is open.