Mining or in situ disintegration of hard material – Hard material disintegrating machines – Stepper-type advance-causing means
Patent
1989-12-13
1991-09-10
Britts, Ramon S.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Stepper-type advance-causing means
405138, E21D 910, E21C 2902
Patent
active
050467832
ABSTRACT:
Tunnel boring machine comprising a transmission housing (11) which during boring is fixed relative to the tunnel. The boring head (15) is axially displaceable relative to an outgoing shaft (14) of the transmission housing while transferring torque from the outgoing shaft to the boring head. A number of fluid cylinders (16) are arranged between the transmission housing and a bearing housing (19,30) for the boring head in order to press the boring head against a tunnel front.
REFERENCES:
patent: 2925258 (1960-02-01), Robbins
patent: 3640573 (1972-02-01), Safar
patent: 3643999 (1972-02-01), Kampf-Emden et al.
Emanuelsson Kaj B. I.
Hartwig Carl S. M.
Atlas Copco MCT AB
Bagnell David J.
Britts Ramon S.
Munson Eric Y.
Stone Mark P.
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