Tunnel boring machine

Details Tunnel boring machine Tunnel boring machine

1979-08-10

1982-09-14

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

With mine roof-supporting means

299 67, 299 75, E21D 908

Patent

active

043492304

ABSTRACT:
In a tunneling machine including a hollow shield, a non-rotatable outer housing mounted in the shield for longitudinal movement, and inner housing rotatably mounted within the outer housing, an excavator including a boom and bucket pivotally mounted on the forward end of the inner housing, and a boom cylinder having a forward portion pivotally engaged with the boom and a rear portion mounted at the rearward portion of the inner housing.

REFERENCES:
patent: 3404920 (1968-10-01), Tabor
patent: 3556599 (1971-01-01), Fikse
patent: 3612609 (1971-10-01), Reuls
patent: 4077670 (1978-03-01), Spies et al.

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