Measuring and testing – Inspecting
Patent
1995-09-28
1996-10-15
Williams, Hezron E.
Measuring and testing
Inspecting
738665, 73623, 324220, 324228, G01N 2904, G01N 2926, G01M 1900
Patent
active
055656331
ABSTRACT:
A spiral pig apparatus is provided for axial movement through a pipe of the type having a cylindrical interior surface defining a central axis. The spiral pig apparatus includes a first and a second section coupled to each other for axial movement of both sections and for relative rotation between the first and second sections. A first plurality of wheels is attached to the first section. Each of the first plurality of wheels is attached at a first rolling angle, relative to the pipe axis for rolling contact with the interior surface of the pipe, and for supporting the first section spaced inward from the interior surface of the pipe. A second plurality of wheels is attached to the second section. Each of the second plurality of wheels is attached at a second rolling angle, relative to the pipe axis for rolling contact with the interior surface of the pipe. The second rolling angle is different from the first rolling angle of the first set of wheels. The second plurality of wheels is also attached for supporting the second section spaced inward from the interior surface of the pipe. A drive mechanism is operatively connected to the spiral pig for causing the pig to move through the pipe, as the first and second sections rotate relative to each other.
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Larkin Daniel S.
Montgomery John W.
Williams Hezron E.
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