Down-the-hole drilling machine

Details Down-the-hole drilling machine Down-the-hole drilling machine

1998-05-19

1999-11-30

Tsay, Frank

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173136, E21B 414

Patent

active

059925450

ABSTRACT:
Down-the-hole drilling machine comprising a housing (1) with a hammer piston (5) movable to-and-fro and intended to exert a drill bit (3) to impacts. The hammer piston is formed with two piston heads (6,7) and a waist (9) between them. An intermediate wall (10) is arranged around the waist (9) so that two chambers (11,12) are formed on either side of the intermediate wall. The chamber (11) between the intermediate wall and the forward piston head (6) is continuously pressurized via a first channel (13) in the intermediate wall. The chamber (12) is via a second channel (15) in the intermediate wall connected to a space (16) in front of the hammer piston (5). Through this double drive areas are obtained during the working stroke of the hammer piston.

REFERENCES:
patent: 3198264 (1965-08-01), Oelke et al.
patent: 3524511 (1970-08-01), Klemm
patent: 3991834 (1976-11-01), Curington
patent: 4321974 (1982-03-01), Klemm
patent: 4932483 (1990-06-01), Rear
patent: 5139096 (1992-08-01), Lister
patent: 5238073 (1993-08-01), Rear
patent: 5685380 (1997-11-01), Purcell et al.

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