专利名称：APPARATUS FOR DIRECTIONAL DRILLING发明人：WENTWORTH, STEVEN, W.,CRANE, ROBERT,
F.
申请号：EP99942470申请日：19990824公开号：EP1027519A4公开日：20031105
摘要：The invention provides an improved apparatus for directional boring and inparticular an improved system for boring through hard and rocky substrates frequentlyencountered when boring under obstacles such as roadways. According to one aspect ofthe invention, a directional drilling apparatus includes a drilling head (30) having a frontface (62) angled relative to the lengthwise axis of the tool and configured for steeringthe drilling apparatus, a housing (32) having an internal chamber for mounting anelectronic locating device therein rearwardly of the drilling head (30) for transmitting asignal indicating the orientation of the angled face of the drilling head (30), and a joint(200) at which the drilling head is removably mounted to the housing of the locatingdevice. The joint (200) includes a splined connection for passing torque from the sondehousing (32) to the bit (31) and an interlock mechanism which mechanically secures the bit(31) to the sonde housing (32) in a manner permitting the bit (31) to be manually removedfrom the housing (32) without undue difficulty.
申请人：EARTH TOOL COMPANY L.L.C.
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