Mining or in situ disintegration of hard material – Hard material disintegrating machines – With mine roof-supporting means
Patent
1994-01-25
1996-08-20
Bagnell, David J.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
With mine roof-supporting means
299 55, E21D 908
Patent
active
055472605
ABSTRACT:
Preliminary cutter units of a shield machine provided with preliminary cutters capable of continuously excavating soil in a working place even if main cutters are worn away. In a shield machine comprising a cutter head which is disposed at the front end of a shield body and is rotated by cutter head motors, and a plurality of main cutters which are attached to the front surface of a face plate of the cutter head and are disposed in the radial direction of the cutter head, the shield machine further comprises preliminary cutter units each of which is attached to a cutter attachment member provided inside the face plate and swingably supported by quadric links and includes a reaction receiver pad attached to the lower surface of the face plate, a lever which is brought into contact with the reaction receiver pad for receiving external force which is applied to the preliminary cutter, an auxiliary link for connecting the lever and the rear end of the cutter attachment member and a hydraulic jack unit which is mounted on the lever for projecting each of the preliminary cutter from the front portion of the face plate or retracting the projected preliminary cutter from the front portion of the face plate.
REFERENCES:
patent: 3556599 (1971-01-01), Fikse
patent: 3917351 (1975-11-01), Pirrie et al.
patent: 3966256 (1976-06-01), Fikse
patent: 4311344 (1982-01-01), Akesaka
patent: 4482270 (1984-11-01), Unger et al.
patent: 4630869 (1986-12-01), Akesaka et al.
patent: 5104261 (1992-04-01), Anderson et al.
Kawai Kazunari
Mitani Norio
Bagnell David J.
Kabushiki Kaisha Komatsu Seisakusho
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