Tunneling machine

Details Tunneling machine Tunneling machine

1978-06-12

1980-02-19

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

Stepper-type advance-causing means

173150, E01D 910

Patent

active

041891864

ABSTRACT:
A diametrically compact tunneling machine for boring tunnels is disclosed. The machine includes a tubular support frame having a hollow piston mounted therein which is movable from a retracted position in the support frame to an extended position. A drive shaft is rotatably mounted in the hollow piston and carries a cutter head at one end. The hollow piston is restrained against rotational movement relative to the support frame and the drive shaft is constrained against longitudinal movement relative to the hollow piston. A plurality of radially extendible feet project from the support frame to the tunnel wall to grip the tunnel wall during a tunneling operation wherein the hollow piston is driven forwardly so that the cutter head works on the tunnel face. When the hollow piston is fully extended, a plurality of extendible support feet, which are fixed to the rearward and forward ends of the hollow piston, are extended, the radially extendible feet are retracted and the support frame is shifted forwardly by the piston so that a further tunneling operation may be initiated.

REFERENCES:
patent: 1039809 (1912-10-01), Rogers
patent: 1219419 (1917-03-01), App
patent: 1284398 (1918-11-01), McKinlay
patent: 2925258 (1960-02-01), Robbins
patent: 3640573 (1972-02-01), Safar
patent: 3653716 (1972-04-01), Hattrup

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