专利名称：Downhole drill assembly发明人：Gien, Bernard Lionel申请号：EP04251700.3申请日：20040324公开号：EP1462604A2公开日：20040929
专利附图：
摘要：The invention provides a down-the-hole drill assembly (1) having exhaustpassages (30, 31, 14, 16, 17, 18, 19B, 20) from upper (24) and lower (11) chambers past theinner end of a bit (19) and through the body of the bit (19) to exit through the bit face(19A). The construction of the assembly (1) and bit (19) obviates a foot valve tube from
the head of the bit and the disadvantages associated with this component.
申请人：Gien, Bernard Lionel
地址：2 & 4 Simba Street, Sebenza Edenvale 1610, Gauteng ZA
国籍：ZA
代理机构：Thomson, Neil David
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