Transmission sleeve for a down hole hammer

Details Transmission sleeve for a down hole hammer Transmission sleeve for a down hole hammer

1991-04-26

1992-10-13

Neuder, William P.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175414, E21B 1300

Patent

active

051542447

ABSTRACT:
The present invention relates to a sacrificial transmission sleeve for a reverse circulation down hole hammer of the percussive type actuated by a fluid under pressure, including an outer sleeve, a drill bit retained in retaining means, the transmission sleeve comprising a body and an annular flange extending from the body towards the drill bit, wherein the transmission sleeve has an outer diameter greater than that of the outer sleeve and substantially the same as the drill bit.

REFERENCES:
patent: 3527239 (1970-09-01), Boom
patent: 3771612 (1973-11-01), Adcock
patent: 4706764 (1987-11-01), Hughes
patent: 4836306 (1989-06-01), Barrows
PJ9682, Apr. 19, 1990 Australia (Priority for PCT 91/00146).

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