Superposed drilling device

Details Superposed drilling device Superposed drilling device

1988-08-09

1989-06-20

Neuder, William P.

Boring or penetrating the earth

With below-ground tool drive prime mover

173 64, 173 78, 173 80, 175215, 175296, E21B 414

Patent

active

048402389

ABSTRACT:
In a scavenger is supplied through a scavenging pipe (26) to the internal pipe string (11), the scavenging pipe (25) extending through a bore (27) of the hammer piston (17) of the hammer drill. Due to a rotary drive (14), the drilling strings (10,11) are rotated which are connected to the shank (13) extending into the rotary drive (14). The scavenger is conducted through the scavenging pipe (26) into the shank (23) and from there into the internal pipe string (11). The external diameter of the scavenging pipe (26) is inferior to the inner diameter of the bore (27) of the hammer piston (17), and of the scavenging bore (23). Sealing between the scavenging pipe (26) and the scavenging bore (23) is effected by a thick head piece (33) at the end of the scavenging pipe. Said head piece (33) contains a seal rubbing along the cylindrical scavenging bore wall if the hammer piston (17) strikes on the shank (13). An annular chamber (35) at the head (33) forms a throttle point in order to reduce shock pressures acting on the seal.

REFERENCES:
patent: 4067596 (1978-01-01), Kellner et al.
patent: 4771835 (1988-09-01), Eaton

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