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. 22, 2007
Filed:
Apr. 30, 2003
Dan Dagenais, Edmonton, CA;
Leslie L. Szalacsi, Ononway, CA;
Jonathan B. Fraser, St. Albert, CA;
Hermann Basler, Stony Plain, CA;
Dan Dagenais, Edmonton, CA;
Leslie L. Szalacsi, Ononway, CA;
Jonathan B. Fraser, St. Albert, CA;
Hermann Basler, Stony Plain, CA;
McCoy Bros. Inc., Edmonton, Alberta, CA;
Abstract
A power tong or back-up tong has a jaw assembly that is advanced into engagement with a pipe through a cam follower that contacts the camming surface on the inside circumference of a ring gear, the cam follower being in the form of a series of roller elements arranged as a circulating bearing. In a preferred form, the roller elements are cylindrical roller bearings and the jaw assembly is mounted for sliding advancement towards the pipe to be engaged. In an alternate variant the cam follower includes an indexing guide that maintains the cylindrical roller bearings in proper alignment.