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:
Nov. 17, 1981
Filed:
Mar. 13, 1980
Honore J Lambot, Wauthier-Braine, BE;
Diamant Boart, Brussels, BE;
Abstract
A double core barrel for carrying out boring and arc drilling in oilfields comprises a rotary outer tube 1 with a boring bit 3 and a non-rotary inner tube 2, with an extractor cone 9, screwed onto the lower non-rotary portion of a pivoting means 11 whose upper rotary position 12 is screwed into a tapped body 4 of the outer tube 1. The upper end 15 of the portion 12 cooperates with an adjustment spanner 16 which transmits a rotation couple to the upper end, to allow adjustment of the spacing for the passage of water between the bit 3 and the cone 9. The upper end 15 has an external longitudinal groove, while the tapped body has a slot 8 at the base of a smooth cylindrical bore 6 and at the level of the longitudinal groove 17. The upper end 15 receives a locking cap 18 having a lower catch 20 and being designed to cooperate with an adjustment spanner 16 to transmit a rotation couple to the catch 20 and being designed to slide between the upper end 15 and the bore 6 so that the catch 20 may first be engaged in the groove 17 and then simultaneously in this groove 17 and in the slot 8 so that the cap 18 then locks the portion 12 and the body 4 to prevent their relative rotation.