Rock drilling equipment

Details Rock drilling equipment Rock drilling equipment

2005-04-05

2008-12-23

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C175S418000

Reexamination Certificate

active

07467674

ABSTRACT:
In a reverse circulation down-the-hole hammer assembly a having a axially extending central tube (30) for recovery of drilling debris, the central tube (30) has a downwardly facing abutment (32) and an upwardly facing upper end and is located axially in the hammer assembly by having the part thereof between the downwardly facing abutment and the upper end located between axially spaced complementary abutments, one of which fixed and the other of which is provided by a resiliently longitudinally displaceable member (42) within a casing part providing an upper end of the hammer assembly and which is removably retained in an adjoining part of the hammer assembly. The longitudinally displaceable member engages the upper end of the central tube and thus clamps the central tube in place.

REFERENCES:
patent: 5154249 (1992-10-01), Yardley
patent: 5778993 (1998-07-01), Moir
patent: RE36002 (1998-12-01), Elsby et al.
patent: 6702045 (2004-03-01), Elsby
patent: 2005/0199429 (2005-09-01), Terlet et al.
patent: 2007/0007045 (2007-01-01), Lorger et al.
patent: 2296731 (1996-07-01), None
patent: WO 98/54433 (1998-12-01), None

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