HAMMER BIT RING IMPROVEMENTS - SANDVIK INTELLECTUAL PROPERTY

Title:

HAMMER BIT RING IMPROVEMENTS

Document Type and Number:

WIPO Patent Application WO/2013/121304

Kind Code:

A3

Abstract:

This invention relates to a down-the-hole hammer drill assembly, and has particular application to a reverse-circulation (RC) down-hole face sampling hammer drill assembly. More particularly, the hammer comprises a bit (20) having an elongate shank (22) and a head (23), and a bit retention element (60) disposed around the shank (22) of the bit and comprising one or more channels (62) for the passage of fluid along the bit.

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Inventors:

HILL RAYMOND (AU)

Application Number:

PCT/IB2013/001184

Publication Date:

October 23, 2014

Filing Date:

January 17, 2013

Export Citation:

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Assignee:

SANDVIK INTELLECTUAL PROPERTY (SE)

International Classes:

E21B10/36; E21B7/20; E21B10/38

Domestic Patent References:

WO2003042492A1	2003-05-22
WO1991016521A1	1991-10-31

Foreign References:

US7117939B1

2006-10-10

Attorney, Agent or Firm:

MADDERNS (Adelaide. S.A. 5001, AU)

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