Dispensing piston for commodity container
OwnerJames L. Popp, Carolyn Popp +1inventors
InventorsJames L. Popp, Carolyn Popp, James A. Dean
Life of this patent
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Abstract
A piston for dispensing material from a commodity container includes a nose section connected to a piston shaft. A recessed channel is located between the nose section and piston shaft. In the channel, there is a seal lifter over which a solid wiping seal is placed. Upon inflation, the seal lifter forcers the wiping seal to extend beyond the periphery of the piston to come into sealing contact with the interior wall of the container.
Claims18
A piston for dispensing material from a commodity container, said piston comprising a nose section, a piston shaft behind the nose section, a recessed channel between the nose section and the piston shaft, a wiping seal in the recessed channel, and a seal lifter positioned in the channel behind the wiping seal, the seal lifter adapted to extend the seal outward beyond the periphery of the piston to come into sealing contact with an interior wall of a container, wherein the seal has a wiping edge formed at the radial end of the seal, the wiping edge having a leading lip and a trailing lip radially extending from the seal, the leading lip and the trailing lip defining a recess therebetween having a ribbon of low friction material positioned therein.
A piston for dispensing material from a commodity container, said piston comprising a nose section, a piston shaft behind the nose section, a recessed channel between the nose section and the piston shaft, a wiping seal in the recessed channel, a seal lifter positioned in the channel behind the wiping seal, and a ribbon of low friction material positioned between the seal lifter and the wiping seal, the seal lifter adapted to extend the seal outward beyond the periphery of the piston to come into sealing contact with an interior wall of a container.
A piston for dispensing commodity material from a commodity container, said piston comprising:
- a nose section having a generally circular peripheral edge adapted to fit in close proximity to an interior wall of the commodity container, said nose section having a convex surface adapted for contacting said commodity material, a central portion of the nose section surface being made from a compressible material and a peripheral ring being made from a rigid material;
- a piston shaft behind said nose section, the piston shaft having at least one generally circular peripheral edge adapted to extend in close proximity to the interior wall of the commodity container;
- a recessed channel between the nose section and the piston shaft, the channel having a bottom located radially inward from the peripheral edge of the nose section;
- a wiping seal positioned within the recessed channel, said wiping seal having a wiping edge adapted to extend radially outward from the peripheral edge of the nose section and to contact the interior wall of the container, the wiping seal being made of a resilient material capable of expanding radially outward when radial forces are applied thereto;
- and
- a seal lifter positioned between the wiping seal and the bottom of the recessed channel, wherein upon actuating the lifter, the lifter applies a radially outward force on the wiping seal to extend the wiping edge to contact the interior wall of the container.
A dispensing piston comprising a nose section, a piston shaft, a recessed channel between the nose section and piston shaft, and a wiping seal placed in the channel wherein the piston shaft includes a plurality of shaft sections and at least one resilient member between at least two shaft sections to allow independent articulation of some of the shaft sections.
Dependencies are inferred from the claim text.