Roof bolt bit

Boring or penetrating the earth – Bit or bit element – Impact or percussion type

Patent

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Details

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.

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