Press-out piston for dispensing substance from a container

Details Press-out piston for dispensing substance from a container Press-out piston for dispensing substance from a container

B - Operations, Transporting

67

D

222/79

B67D 7/60 (2010.01) B65D 83/00 (2006.01) F16J 15/48 (2006.01)

Patent

CA 1263635

ABSTRACT OF THE DISCLOSURE A press-out piston is movably displaceable through an axially extending container holding a flow- able plastic substance for dispensing the substance as the piston is forced through the container. The radially outer circumference of the piston has an annular groove in which an elastically deformable seal- ing ring is positioned. The base of the groove is conically shaped about the axis of the container and diverges outwardly toward the rear end of the container. when the piston is pressed toward the front end of the container for dispensing the substance, the sealing ring is moved axially relative to the piston and is pressed radially outwardly against the inside surface of the container. As a result, the seal for the piston is dependent on the pressure directed against the sub- stance for dispensing it out of the container.

474450

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