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. 08, 1989
Filed:
Apr. 08, 1988
Alfred Ostertag, Celle, DE;
Hans Schillinger, Celle, DE;
Eastman Christensen Company, Salt Lake City, UT (US);
Abstract
A stabilizer for deep well drilling tools is disclosed which includes a tubular outer casing having a plurality of slit openings distributed around its periphery with a tubular adjusting mandrel supported in the casing for relative axial movement therewith in response to well fluid pressure applied to the well. A separate elongated ribbed body is movably mounted in each slit opening. Each of the ribbed bodies has a rear wedge face facing opposite to the relative motion of the mandrel which cooperates with a separate mating wedge face on the mandrel such that the ribbed body moves radially outwardly in its respective slit opening upon contact between said mating wedges upon axial movement of the mandrel relative to the casing in response to well fluid pressure applied to the well. Also, each end of each ribbed body has an axially projecting guide projection which terminates in a reduced dimension at its end. Each guide projection has a separate securing piece adapted to be inserted through a slit from outside the casing to hold its guide projection in the casing. Each securing piece has the basic shape of a cylindrical segment and can be inserted into the casing so it is flush therewith. A separate locking pin secures each securing piece in the casing.