Patent ID: 6027147
Filing Date: 2000-02-22
Classification: F16L

Abstract:
An internal dust seal apparatus for connection between the mating end portions of adjacent generally concentrically aligned duct sections, each of said duct sections having both male and female end portions, said male end portion forming a flow liner and having a slightly smaller diameter than said female end portion and being inserted thereinto, said male and female end portions having flexible external sealing means connected across space therebetween, both of said male and female end portions having interior and exterior surfaces, said internal dust seal apparatus comprising:an endless flexible belt having a continuous main body with opposing ends;first connection means for connecting one of said opposing ends to said interior surface of said male end portion, andsecond connection means for connecting the other of said opposing ends to said interior surface of said female end portion;said first and second connection means securing said belt interiorly of said duct sections thereby preventing the accumulation of particulate matter in the space between said male and female end portions.