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:
Mar. 17, 1987
Filed:
May. 01, 1985
Applicant:
Inventors:
Karl Bollinger, Rueil Malmaison, FR;
Philippe Chagnot, Moret sur Loing, FR;
Assignee:
Soletanche, Nanterre, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 84 ; 1510404 ;
Abstract
The invention relates to an apparatus for cleaning, during its extraction without rotation, of a drill formed from a helical surface wound around an axial stem. It comprises a scraper blade capable of being inserted at will between two turns of the helical drill, and that it comprises a motor for causing the scraper blade to revolve around the stem substantially in synchronism with the speed of extraction of the drill.