Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable-type bit mount
Patent
1994-12-23
1996-04-02
Bagnell, David J.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable-type bit mount
E21C 35197
Patent
active
055034632
ABSTRACT:
A cutting tool assembly including a cutting bit having a head and a cylindrical shank portion of substantially constant diameter depending from the head as well as a bit holder including a cylindrical bore for receiving the cylindrical shank portion of the cutting bit. The shank portion includes an annular recessed groove, the cylindrical bore includes a notch corresponding to and disposed opposite the annular recessed groove. The cutting tool assembly further includes a retainer sleeve disposed between the shank portion of the cutting bit and the bore of the bit holder and which closely conforms about the shank portion while allowing the shank portion to rotate within the bore. The retainer sleeve includes at least one inwardly prestressed projection closely following the contour of a portion of the recessed groove and at least one outwardly prestressed finger projecting into the notch in a direction opposite the inwardly prestressed projection to retain the cutting bit within the bore of the bit holder and to prevent axial removal of the cutting bit when in use while allowing rotational movement of the cutting bit within the bore.
REFERENCES:
patent: 3767266 (1973-10-01), Krekeler
patent: 4201421 (1980-05-01), Den Besten et al.
patent: 4484783 (1984-11-01), Emmerich
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patent: 4728153 (1988-03-01), Ojanen et al.
patent: 4836614 (1989-06-01), Ojanen
patent: 4850649 (1989-07-01), Beach et al.
patent: 4921310 (1990-05-01), Hedlund et al.
Bagnell David J.
Rogers Tool Works, Inc.
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