Device for moving a pig through a conduit, such as a pipeline

Details Device for moving a pig through a conduit, such as a pipeline Device for moving a pig through a conduit, such as a pipeline

2005-05-05

2009-11-10

Guidotti, Laura C (Department: 3727)

Brushing, scrubbing, and general cleaning

Implements

Pipe, tube, or conduit cleaner

Reexamination Certificate

active

07614109

ABSTRACT:
A pig towing device is adapted for movement through a conduit having bends and open T intersections. The pig has a front leading cup and a rear trailing cup adapted to seal with the conduit for propelling the device through the conduit. The leading and trailing cups are spaced apart a predetermined distance to maintain the seal with the conduit as the pig towing device negotiates past the open T intersections. The pig towing device has a flexible body interconnecting the front leading cup and the rear trailing cup. The flexible body is urged normally into a straight position extending along a central axis thereof to maintain the front leading cup and the rear trailing cup spaced apart by the predetermined distance. The flexible body has predetermined limited flexibility permitting it to bend relative to the central axis as the pig towing device negotiates through the bends in the conduit.

REFERENCES:
patent: 2474690 (1949-06-01), Robinson et. al.
patent: 4715128 (1987-12-01), Cummings et al.
patent: 5080020 (1992-01-01), Negishi
patent: 5205048 (1993-04-01), Toomey et al.
patent: 6381797 (2002-05-01), Filippovitch et al.
patent: 6538431 (2003-03-01), Couchman et al.
patent: 54-119765 (1979-09-01), None
patent: WO 2004/028714 (2004-04-01), None
English translation of Abstract of JP 54-119765, Yamamoto et al., Sep. 1979.

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