Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable-type bit mount
Patent
1994-08-25
1996-06-25
Bagnell, David J.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable-type bit mount
E21C 3519
Patent
active
055293840
ABSTRACT:
A bit holder block is provided composed of a foot portion for being received in a seat of a rotary member and a bit holder portion for releasably holding a cutter bit with respect to a bit bore therein. The bit bore has a forward opening at a bit abutment face of the bit holder block. The cutter bit is provided with an annular abutment surface for abutting the bit abutment face. A bit retainer port is provided in the bit holder block located at, and communicates with, a rear opening of the bit bore for therein securing a retainer clip to an annular groove in the cutter bit. A rear segment of the bit holder block provides a strong reinforcing structure for the area around the rear opening of the bit bore which counters a fulcrum force generated at the rear opening of the bit bore, the fulcrum force arising during operation due to a resultant force acting on the cutter bit being directed below the axis of the cutter bit, rather than above it, as was previously believed in the art.
REFERENCES:
patent: 3749449 (1973-07-01), Krekeler
patent: 3841708 (1974-10-01), Kniff et al.
patent: 3992061 (1976-11-01), Rollins
patent: 4302055 (1981-11-01), Persson
patent: 4343516 (1982-08-01), Aden
patent: 4415208 (1983-11-01), Goyarts
patent: 4944560 (1990-07-01), Osterwise
Product Information Sheet of EIMCO, A Tamrock Co., Fairmont WV of Products Model 2810-1 and 5810; (Date Unknown).
Bise Douglas
Ojanen Randall W.
Bagnell David J.
Rogers Tool Works, Inc.
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