The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 1984
Filed:
Sep. 28, 1983
Robert H Wittman, Houston, TX (US);
David E Adkins, Houston, TX (US);
Ronnie E Haws, Houston, TX (US);
Hughes Tool Company, Houston, TX (US);
Abstract
A plugging apparatus is disclosed for plugging the bore of a pipe at a selected location and withstanding a pressure differential thereacross that may equal or exceed the designed working fluid pressure of the pipe and includes a body adapted for insertion into the pipe bore and for axial movement within the pipe, the body including an upstream pressure head having a selected projected area and a support structure (which can conveniently be pigging discs) attached to and cooperating with the body for supporting the body axially in the pipe during movement in the pipe. A pipe gripping structure is carried by the body, locking engagement with the inside surface of the pipe. A plurality of annular elastomeric sealing members having a selected annular area are circumferentially mounted on the body. An actuating structure, such as a hydraulic cylinder, is provided for actuating the pipe gripping structure into locking engagement with the pipe and for applying an axial force to the compression sealing members for radially expanding the sealing members into engagement with the pipe wall.