Patent · US Active

Scraper pig

US8671495B2 · kind B2 · utility

2Cited by

39References

27Claims

0Family size

Assignee

Durr Systems, Inc. · US

Inventors

Herbert Martin · Waiblingen, DE
Werner Schwager · Ludwigsburg, DE
Martin Stiegler · Uhingen, DE
Andreas Collmer · Leinfelden, DE
Manfred Michelfelder · Höpfigheim, DE

Key dates

Filing date	Nov 6, 2006
Grant date	Mar 18, 2014
Priority date	—
Expiry date	Nov 6, 2026

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB05B12/1481
WIPO fieldChemical engineering
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.