Manually operable device for metering air through a valve system for drawing into, retaining and evacuating material from a chamber

摘要

A manually operable device for metering air through a valve system for drawing into, retaining and evacuating material from a chamber having a first conveying mechanism operatively connected to the chamber and exposed to the atmosphere for transporting the material, a second air conveying mechanism operatively connected to the chamber, a manually operable device for moving air within the second conveying mechanism and a valve mechanism operatively connected to the second conveying mechanism which when in a first position upon actuation of the manually operable mechanism moves air creating a partial vacuum within the chamber causing material to be drawn into the chamber, and when in a second position upon actuation of the manually operable mechanism causes air to be introduced under positive pressure into the chamber evacuating the material from the chamber into the first conveying mechanism.