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:
Jan. 08, 2002
Filed:
Oct. 22, 1999
Bjørn Eilertsen, Hundvåg, NO;
John Daniel Madsen, Sandnes, NO;
Engineering & Drilling Machinery AS, Stavanger, NO;
Abstract
A derrick, especially a drilling rig derrick, including a derrick structure and lifting tackle for a load, for example, a drill string, in the derrick structure. The lifting tackle includes guideways in parallel relation which each includes a vertical main guide rail ( ), a storage guide rail ( ) parallel thereto, and in a lower portion of the derrick a connecting guide portion ( ) between the two said rails, a rack ( ) are slidably arranged in each guideway which racks ( ) are divided into successive, preferably hingedly interconnected rack segments ( ) designed to bear against one another when the rack ( ) or when a part thereof is in the vertical main guide rail ( ) the main guide rail ( ) being designed for horizontal support of the rack segment ( ), a load-being yoke ( ) supported on the rack ( ) in the respective vertical main guide rails ( ), and a driving gear ( ) including a driving gearwheel ( ) in driving engagement with the rack ( ), in the respective vertical guide rails ( ).