Treadle-operated vacuum supply device

摘要

A vacuum control system is disclosed consisting of a pedal actuated valve connected between a source of air under pressure and a Venturi tube where the valve and the Venturi tube are enclosed within a base and a treadle member pivotally mounted on the base for actuating the valve. The Venturi tube has a port in which a vacuum is created upon actuation of the valve to its open position. Air ejected from the Venturi may be noiselessly diffused by porous filler material disposed adjacent the output side of the Venturi. Further, the ejected air is directed away from the foot and leg of the operator by enlarging the clearance between the forward edges of the treadle member and base while decreasing the clearance between the rear edges thereof when the treadle member is depressed to actuate the system.