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MACHINE FOR DRIVING TUNNELS, DRIFTS, RAISES, AND THE LIKE

  • US 3,647,264 A
  • Filed: 04/14/1970
  • Issued: 03/07/1972
  • Est. Priority Date: 04/14/1970
  • Status: Expired due to Term
First Claim
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1. A tunneling machine comprising a main frame, means for supporting said main frame in a tunnel, a cutting device pivotably mounted on the main frame for swinging about a first horizontal axis which is transverse to the longitudinal axis of the machine or of the tunnel, motor means for producing a reciprocating swinging movement of said cutting device about said first axis to effect an upward cutting stroke and a return stroke, a circular cutter head of the cutting device rotatable about an axis which is perpendicular to said first axis, motor means for rotating said cutter head, a plurality of cutter bits arranged circumferentially on the cutter head for cutting over the whole width of the tunnel face upon simultaneous rotating of the cutter head and upward swinging of the cutting device, and means for conveying debris from the tunnel face, said cutting device being mounted in said main frame by means of a pair of trunnions journaled in the frame, the interior of each trunnion forms a cylinder for a piston which is rotatable with respect to the cylinder, and said pistons are adapted to extend tunnel wall engaging members so as to brace the cutting device between the sidewalls of the tunnel but permit swinging of the braced cutting device.

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