Patent ID: 9009905
Filing Date: 2015-04-21
Classification: B08B,F16L,F28D,F28G,Y10T

Abstract:
1. A pipe pig with a pipe pig axis, the pipe pig comprising: arcuate cleaning elements forming an expandable circumference, each of the arcuate cleaning elements having at least one scraping edge, in which the arcuate cleaning elements form linked pairs of arcuate cleaning elements connected by sliding pin joints, each sliding pin joint having a pin received to slide along a pin guide in a path perpendicular to a pin axis, the pin axis being parallel with the pipe pig axis; and a pressure responsive expander comprising a set of levers connected to the arcuate cleaning elements via yokes, the levers being spring biased to cause, in operation, the expandable circumference to expand and contract in response to varying pressure on the pressure responsive expander.