Abstract A new and improved pig is disclosed. In the preferred embodiment, the pig is constructed of a foamed plastic body which is elongate, shaped somewhat like a bullet and which body is wrapped with spiraled cloth which is joined into the bullet shaped body by the elastomeric material which forms the body. The cloth material is a backing for metal staples which are U-shaped and which position pairs of parallel points extending outwardly. They form collectively an abrasive surface on the body which enables it to clean a pipeline. An improvement is incorporated wherein an additional coat of elastomeric material encapsulates the staples, supporting them in a fixed relative position to one another and which additional coating material is on the exterior of the belting to support the staples.
An improved pipeline pig which comprises: an elongate body having an outer surface thereon which is adapted to pass through a pipeline; a cloth backing embedded in the surface of said body having a plurality of U-shaped staples extending radially outwardly of the pig; and a supplemental elastomeric coating on said pig body which coating surrounds the legs of the U-shaped staples and which coating is applied to a thickness bringing its outer surface to a depth approximately equal to the length of the staple legs extending from the pig.
Claim 2
Dependent Claim
90 words
An improved pipeline pig which comprises: an elongate body having an outer surface thereon which is adapted to pass through a pipeline; a cloth backing embedded in the surface of said body having a plurality of U-shaped staples extending radially outwardly of the pig; and a supplemental elastomeric coating on said pig body which coating surrounds the legs of the U-shaped staples and which coating is applied to a thickness bringing its outer surface to a depth approximately equal to the length of the staple legs extending from the pig.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein said coating has a hardness of about 50 to 90 Shore A durometer hardness on the Rockwell scale.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1 wherein said coating is applied to the staple legs to fixedly support them and hold them in place.
Claim 5
Dependent Claim
30 words
The apparatus of claim 3 wherein said coating is sufficiently thick to support at least some but not all of the weight of the pig when in a pipe line.