.~ Actuated by pressure of or suction on material to be dispensed
DEFINITION
Classification: 222/335
(under subclass 251) Dispensers in which there is a discharge assistant which is actuated by the pressure of the material being dispensed, or by suction on such material, the pressure of suction creating means not being claimed.
(1) Note. The discharge assistant may be moved by the pressure of material and also require additional actuation (as manually) to cause discharge assisting function.
(2) Note. The pressure on the material may fill a trap chamber, and thereafter operate on a piston to cause the piston to move and force the material from the trap chamber.
(3) Note. Valve or closure elements on the interior of the receptacle caused to move toward closing position due to pressure on the contents and thus push material through the outlet are included.
SEE OR SEARCH THIS CLASS, SUBCLASS:
92+, for patents which claim characteristics of the collapsible wall or means for collapsing the same.
249+, for floating piston devices operated by material pressure. 252+, where a second means for creating pressure on the contents is claimed.
322, where means for operating the discharge assistant extends through the dispensing outlet.
491+, where the valve or closure does not push material through the outlet due to motion caused by pressure of the material.
