One-piece ventable piston for a dispensing apparatus, a dispensing apparatus with same, and method of making same

摘要

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.

主权项

1. 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.