Patent ID: 8307856
Filing Date: 2012-11-13
Classification: F16L,Y10T

Abstract:
1. A pipe plug for temporarily plugging a pipe, said pipe plug comprising: a carrier having a pivotal connection to a trailing plugging head in a plurality of plugging heads; each head in the plurality of plugging heads having a pivotal connection one to the other, at least one plugging head in said plurality of plugging heads having an expandable sealing element; and a fluid circuit in communication with said expandable sealing element; a fluid provided by said fluid circuit causing said expandable sealing element to move between a retracted position and an expanded position; each said pivotal connection permitting a respective plugging head in said plurality of plugging heads to rotate about a pivot point and traverse a right angle and enter an interior space of the pipe when at least a portion of one of said carrier and one plugging head in said plurality of plugging heads lies outside of the interior space of the pipe.