(under subclass 251) Dispensers in which the outlet for material to be dispensed from a supply receptacle or trap chamber is above the material surface level thereof, and there are structural means (as distinguished from fluids)
which enters the mass of material in a supply receptacle, with a resultant displacement of a volume of material equal to the volume of that portion of the structural means that has entered the material, and thus cause the upper surface of the material to rise to or above the level of the outlet to overflow for discharge or for a step preliminary to discharge.
SEE OR SEARCH THIS CLASS, SUBCLASS:
373, for devices which introduce a liquid into contact with the material in a trap chamber to displace the material.
395, for devices which introduce liquid into a supply chamber into contact with the material to displace the same.
405, for miscellaneous discharge assistants which cause discharge from the top of the supply.
SEE OR SEARCH CLASS 48, Gas: Heating and Illuminating,
14, for such means for feeding water to acetylene generators.
137, Fluid Handling,
101.11, for such means in a fluid handling system.
141, Fluent Material Handling, With Receiver or Receiver Coacting Means,
245, for such means associated with filling apparatus.
