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:
May. 11, 1993
Filed:
Jul. 14, 1992
Steven J Hiemsoth, Brooklyn Park, MN (US);
Cherne Industries Incorporated, Minneapolis, MN (US);
Abstract
An inflatable, expansible, multisize plug device which seals and locks the interior of a pipeline section. The plug device comprises a cylindrical body structure and includes a central member and removable inner and outer disc members attached thereto. The outer disc member further has a raised screw mounting structure longitudinally formed thereon. An inflatable elastomeric sealing ring is disposed annularly about the body structure, and forms an inner cavity between the sealing ring and the body structure. The sealing ring further has a generally rectangular, open bottomed cross-section with an outer contact wall of a predetermined longitudinal width and a pair of depending radial walls. Each radial wall terminates in an end portion and the end portions sealingly connect the body structure via spacially parallel, annular channel structures which are axially disposed in the body structure and which have generally T-shaped cross-sectional configurations with respect to the overall body structure. The plug device further has an inflator which permits the ingress and egress of fluid into and out of the inner cavity. A plurality of radially aligned locking screws are arranged to mechanically engage the pipeline interior wall, and are disposed in the screw mounting structure.