One-piece ventable piston for a dispensing apparatus, a dispensing apparatus with same, and method of making same
AssigneePlas-Pak Industries, Inc.
InventorCharles M. Frey
Life of this patent
Estimating the term…
Abstract
A piston has a one-piece body having a first portion and a second portion. The second portion is integrally formed with the first portion, is flexibly movable between a first position and a second position relative to the first portion, and is biased toward the first position. The first portion has an orifice, and the second portion has a seal member. When the second portion is disposed in the first position, the seal member is disposed in a sealed arrangement with the orifice, and when the second portion is disposed in the second position, the seal member is disposed in an unsealed arrangement with the orifice.
Claims23
A piston, comprising:
- a one-piece body having a first portion and a second portion, the second portion being integrally formed with the first portion, being flexibly movable between a first position and a second position relative to the first portion, and being biased toward the first position;
- wherein the first portion comprises an orifice;
- wherein the second portion comprises a seal member;
- wherein when the second portion is disposed in the first position, the seal member is disposed in a sealed arrangement with the orifice;
- and
- wherein when the second portion is disposed in the second position, the seal member is disposed in an unsealed arrangement with the orifice.
Dependencies are inferred from the claim text.