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:
Dec. 22, 1992
Filed:
Mar. 26, 1991
Richard M Wiesman, Wayland, MA (US);
Edward E Fischer, Acton, MA (US);
Richard R Fontana, Lexington, MA (US);
Bruce B Gamble, Wellesley, MA (US);
Robert T Hsiung, Brookline, MA (US);
Steven J Kozminski, Rutland, MA (US);
Gas Research Institute, Chicago, IL (US);
Abstract
A cornering pipe traveler includes a tractor having a pair of carriages, a leading carriage and a trailing carriage, each carriage including a clamping device for positively engaging the inner surface of the pipe, and structure for propelling the carriage along the pipe; interconnected between the pair of carriages there is a device for exerting a curling force between the two carriages for mechanically compelling the lead carriage to curl and enter a turn in the pipe; also included is structure for aligning the lead carriage so that the curling force compels the pipe traveler to enter a selected turn to be made.