Loose crown underreamer apparatus

Details Loose crown underreamer apparatus Loose crown underreamer apparatus

1993-07-28

1994-06-21

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

173132, 175415, 175320, E21B 1036, E21B 1062

Patent

active

053221397

ABSTRACT:
A loose crown underreamer apparatus (10) for boring into earth and other materials includes a crown (28) loosely coupled to a bit shank (12). The loose coupling mechanism (34) employed in the present invention reduces the occurrence of friction welds occurring between crown (28) and bit shank (12). Coupling mechanism (34) employed in the present invention includes a plurality of deformable polyurethane retainer balls (36) disposed in shank sockets (38) and corresponding crown sockets (40). Coupling mechanism (34) employed in the present invention allows for crown (28) to be uncoupled and re-coupled to bit shank (12) at will.

REFERENCES:
patent: 1922559 (1933-08-01), Strobel
patent: 2022055 (1935-11-01), Sanderson
patent: 2039494 (1936-05-01), Sanderson
patent: 3709306 (1973-01-01), Curington
patent: 3791463 (1974-02-01), Pearson
patent: 4043409 (1977-08-01), Walter
patent: 4083415 (1978-04-01), Kita et al.
patent: 4919221 (1990-04-01), Pascale
Halco DTH Drill Bits-Trade Brochure; Jan. 1990.
Halco DTH Hammers-Trade Brochure; Jun. 1992.

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