Pipes and tubular conduits – With flow regulators and/or baffles – Restrictors
Reexamination Certificate
2005-03-10
2009-02-03
Hook, James F (Department: 3754)
Pipes and tubular conduits
With flow regulators and/or baffles
Restrictors
C138S046000, C138S093000
Reexamination Certificate
active
07484532
ABSTRACT:
A sealing rib is disposed within a pipeline, such that an interior of the pipeline is divided uniformly into plural flow paths along a peripheral direction. A flexible-film body to whose interior a fluid for inflation can be supplied, is disposed in each divisional flow path. Each of the plural flexible-film bodies within the pipeline is inflated by the fluid so as to block-up the pipeline. Therefore, a height of the flexible-film body which is in an inflated state can be made to be low. Further, because little tension is applied to the flexible-film body, it suffices for a durable strength required of the flexible-film body to be small. In accordance with this structure, it is possible to obtain a flexible-film expandable gate which does not use a highly-rigid film body, and which can reliably exhibit a water stopping ability even in a pipeline of a large diameter.
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Bridgestone Corporation
Hook James F
Sughrue & Mion, PLLC
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