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. 16, 2021
Filed:
Sep. 21, 2017
Master Sinkers (Pty) Ltd, Fochville, ZA;
Barend Jacobus Jordaan, Johannesburg, ZA;
Nicolaas Bodenstein Goodwin, Fochville, ZA;
Daniel Coenraad Pretorius, Fochville, ZA;
Louis Germishuys, Centurion, ZA;
Gerhard Pretorius, Fochville, ZA;
MASTER SINKERS (PTY) LTD, Fochville, ZA;
Abstract
A shaft enlargement arrangement for a boring system comprises a hollow column proximate a lower end of the boring system. A reamer section comprising a downwardly tapering first cutter head arrangement is rotatably fitted to the hollow column, with a first drive being provided to rotate the first cutter head arrangement relative to the hollow column so as to bore downwardly a hole having a diameter corresponding substantially to the diameter of the first cutter head arrangement. A boring head arrangement is fitted to an operatively lower end, the boring head arrangement terminating in a downwardly tapering second cutter head arrangement to bore a leading or pilot hole, having a diameter that is less than the diameter of the first cutter head arrangement, as the boring system proceeds to bore downwardly.