Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1997-10-10
2000-02-22
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
1754201, E21B 1058
Patent
active
060269189
ABSTRACT:
A roof bolt bit arrangement comprising a combination spade drill body having a rotational axis, a shank portion, a generally planar spade cutter portion with a pair of oppositely directed cutting edges extending radially of the axis, and at least one rotatable frusto conical cutter mounted on the shank portion with its cutting edge in the path of the maximum radial extent of each spade cutter portion cutting edge.
REFERENCES:
patent: 1640644 (1927-08-01), Bullum
patent: 2976027 (1961-03-01), Allimann
patent: 4313506 (1982-02-01), O'Connell
patent: 4444281 (1984-04-01), Schumacher, Jr. et al.
patent: 4729441 (1988-03-01), Peetz et al.
patent: 4819748 (1989-04-01), Truscott
patent: 5452628 (1995-09-01), Montgomery, Jr. et al.
Briese Industrial Technologies, Inc.
Finkelstein Don
Tsay Frank
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