Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent
1974-01-21
1976-03-30
Brown, David H.
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
Fluid or cuttings directing or receiving means engaging bore...
175213, 15210B, E21C 702
Patent
active
039468186
ABSTRACT:
A dust guard intended for preventing drill dust from being spread out into the atmosphere during air flushed rock drilling. The dust guard comprises a bell-shaped suction shell which in operation is located around the drill stem at the rock surface and which is continuously discharged by a suction source. The shell is provided with a flexible collar the object of which is to hinder dust particles from leaving the shell along the drill stem. The flexible collar comprises an outer ring and a number of resilient tongues arranged in a fan-like manner between the outer ring and a central drill stem opening. The collar may be made in one piece.
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patent: 2654906 (1953-10-01), Anderson
patent: 2730333 (1956-01-01), Lenhart et al.
patent: 2883693 (1959-04-01), Leathers et al.
patent: 3045769 (1962-07-01), Feucht et al.
patent: 3422913 (1969-01-01), Young
patent: 3800890 (1974-04-01), Gyongyosi et al.
Atlas Copco Aktiebolag
Brown David H.
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