Master Sinkers (pty) Ltd

Gerhard Pretorius

Barend Jacobus Jordaan

Nicolaas Bodenstein Goodwin

Daniel Coenraad Pretorius

Louis Germishuys

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.

Growing community of inventors

Fochville, South Africa

Gerhard Pretorius