E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
262/47
E21C 25/06 (2006.01) E21D 9/08 (2006.01)
Patent
CA 1244490
HEAD INTAKE FOR TUNNELLING MACHINE Inventor: Richard Lovat ABSTRACT OF THE DISCLOSURE Apparatus for tunnelling through soil, in which a cutting head is rotatably mounted on a housing and atmospherically sealed from the housing. A muck ring is located in the housing to collect loose soil through an opening into the chamber of the muck ring and the opening is closable to maintain a pre-set earth pressure in the cutting head.
526981
Lovat Richard
Hanley Lewis Edward
Lovat Richard
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