Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1993-11-19
1995-06-06
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175364, E21B 1010, E21B 1012
Patent
active
054214220
ABSTRACT:
The cutter head of a tunnelling machine is mounted for rotation about the axis of the tunnel and has a face extending on a plane perpendicular to that axis. The cutter head serves as a mount for a plurality of roller cutters, each of which is mounted in a box like saddle member fixed to the cutter head. Each roller cutter includes a frame having a shaft on which the roller cutter is journalled and a pair of end members which fit in recesses on the inside of the saddle member. These recesses open toward the rear of the cutter head to allow removal and replacement of cutters and cutter frames from the rear face of the cutter head. Each cutter frame is held in place by a wedge member on each side of the saddle and wedge members, one on each side, engage mating wedge surfaces on the saddle and the adjacent end member of the cutter frame so that movement of each wedge member by a jack screw in a direction transverse to the axis of the roller forces each end member forwardly in its recess. Suitable clamp bolts extending along an axis parallel to the roller axis extend through the wedge member to make threaded engagement with the saddle to hold the wedge members in place.
REFERENCES:
patent: 3749188 (1973-07-01), Schumacher, Jr.
patent: 3791705 (1974-02-01), Schimel
patent: 3851718 (1974-12-01), Fink
patent: 3863994 (1975-02-01), Fink
patent: 4202418 (1980-05-01), Waddell
patent: 4234235 (1980-11-01), Robbins et al.
Crane Clayton H.
Kocab John P.
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