Mining or in situ disintegration of hard material – Hard material disintegrating machines – Stepper-type advance-causing means
Patent
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
Jarva, Inc.
Purser Ernest R.
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