Scraper pig
First Claim
1. A pig traversable through a conduit delivering a liquid, comprising:
- a pig body being integrally formed;
a resilient flexible generally frustoconical sealing lip extending from said pig body and having a leading frustoconical wall extending rearward from a distal end of said sealing lip increasing in thickness toward an apex of said sealing lip, said distal end of the sealing lip forming an angle with the leading frustoconical wall, the sealing lip further having a following surface defining a following frustoconical wall extending rearward from said apex to an annular protuberance, said following surface defined by a substantially straight line in an axial direction along a surface of the pig body from said apex to a location at which said following wall mates to said annular protuberance, said sealing lip surrounding said pig body and having a major diameter greater than an internal diameter of the conduit;
said annular protuberance extending from said body portion radially outwardly inboard of said sealing lip thereby protecting said sealing lip.
1 Assignment
0 Petitions
Accused Products
Abstract
A pig traversable through a conduit to deliver a liquid, such as a coating material, having a resilient flexible, generally frustoconical sealing lip which is resiliently biased against an internal surface of the conduit and a resilient biasing member engaging and biased against an under surface of the sealing lip, biasing the sealing lip against an internal surface of the conduit. The disclosed embodiments of the resilient biasing member include annular coil springs and serpentine annular metal springs which may be U-shaped in cross-section, including a first leg received against the under surface of the sealing lip and a second leg received against the pig body portion.
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Citations
27 Claims
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1. A pig traversable through a conduit delivering a liquid, comprising:
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a pig body being integrally formed; a resilient flexible generally frustoconical sealing lip extending from said pig body and having a leading frustoconical wall extending rearward from a distal end of said sealing lip increasing in thickness toward an apex of said sealing lip, said distal end of the sealing lip forming an angle with the leading frustoconical wall, the sealing lip further having a following surface defining a following frustoconical wall extending rearward from said apex to an annular protuberance, said following surface defined by a substantially straight line in an axial direction along a surface of the pig body from said apex to a location at which said following wall mates to said annular protuberance, said sealing lip surrounding said pig body and having a major diameter greater than an internal diameter of the conduit; said annular protuberance extending from said body portion radially outwardly inboard of said sealing lip thereby protecting said sealing lip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A pig for delivering a coating material through a conduit, said pig comprising:
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a body portion being integrally formed; a thin resilient flexible annular sealing lip extending from said body portion, the sealing lip having a major diameter greater than an internal diameter of the conduit, said annular sealing lip defining a leading surface shaped as a leading frustoconical wall extending from a distal end of said sealing lip to another surface defining an other frustoconical wall, said distal end of the sealing lip forming an angle with the leading frustoconical wall, said surfaces meeting to define an apex of said sealing lip so that said annular sealing lip increases in thickness toward said apex of said sealing lip, and said leading surface defining a substantially obtuse angle with said other surface, with said other frustoconical wall defined by a substantially straight line in an axial direction along a surface of the body portion from said apex to a location at which said other surface mates to an annular protuberance extending from said body portion radially outwardly inboard of said sealing lip thereby protecting said sealing lip; and
said following frustoconical wall defined said annular protuberance. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification