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:
May. 03, 1994
Filed:
Jul. 26, 1993
Applicant:
Inventor:
Thomas C Whitehouse, Puyallup, WA (US);
Assignee:
The Robbins Company, Kent, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21D / ;
U.S. Cl.
CPC ...
299 61 ; 175384 ; 299 90 ;
Abstract
A down reaming apparatus including a cutterhead body and a plurality of arms radially disposed on the cutterhead body with cutter assemblies on each arm. A first arm has a given length and additional arms each are of different length. Arm extenders having cutter assemblies are attached to each arm such that the combined length of each of the arms and attached arm extender is substantially equal. Spacers are attached to at least one of the arms to increase the diameter of the cutterhead in conjunction with the relocation of each of the arm extenders.