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:
Jul. 04, 1989
Filed:
Mar. 25, 1988
Andre Cendre, Cosne Sur Loire, FR;
Jean Boulet, Paris, FR;
SMF International, Cosne Sur Loire, FR;
Abstract
The drilling device comprises at least two stabilizers (7a, 7b, 7c) spaced apart in the longitudinal direction of the set of rods. The pistons (17a, 17b, 17c) of these stabilizers are interconnected and include common members (35, 37) for creating a pressure drop in the drilling fluid. Actuating surfaces (19a, 19b, 19c) including ramps (40) and complementary parts interconnecting the ramps cooperate with finger members (20) for effecting the extension of the bearing plates (21). The ramps (40) and the complementary parts of the actuating surfaces of the stabilizers (7a, 7b, 7c) are aligned in the longitudinal direction and are such that for each stable successive position of the pistons (17a, 17b, 17c), the bearing plates (21) are in positions of extension constituting a combination different from the preceding one.