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1. 发明授权

US06655481B2 Methods for fabricating drill bits, including assembling a bit crown and a bit body material and integrally securing the bit crown and bit body material to one another 有权
标题翻译：用于制造钻头的方法，包括组装钻头牙冠和钻头体材料并将钻头牙冠和钻头体材料彼此一体地固定
公开(公告)号：US06655481B2
公开(公告)日：2003-12-02
申请号：US10179683
申请日：2002-06-25
申请人： Sidney L. Findley , Trent N. Butcher , Gordon A. Tibbits
发明人： Sidney L. Findley , Trent N. Butcher , Gordon A. Tibbits
IPC分类号： E21B1002
CPC分类号： E21B10/55 , B22F7/06 , B22F7/062 , B22F2005/001 , B22F2998/00 , B22F2998/10 , B22F2999/00 , B33Y80/00 , Y02P10/295 , B22F3/005 , B22F5/10 , B22F3/1055 , B22F3/26
摘要： A method of fabricating the drill bit includes employing known layered-manufacturing techniques to fabricate the bit crown, positioning a bit gage mold adjacent the bit crown, and disposing a core material within an interior of the bit crown and a cavity of the bit gage mold. A mold that may be employed to fabricate the drill bit includes an initially conforming mold region, in which the prefabricated bit crown may be disposed, and a second, substantially rigid mold region including a cavity to define the gage of the drill bit. Preferably, the conforming mold region is formed of a nonwettable, granular material.
摘要翻译：一种制造钻头的方法包括采用已知的分层制造技术来制造钻头牙冠，将钻头牙冠定位在钻头牙冠附近，并将芯材料设置在钻头牙冠的内部和钻头盖模具的腔内。可用于制造钻头的模具包括最初配合的模具区域，其中可以布置预制的钻头牙冠，以及包括用于限定钻头的量规的空腔的第二基本上刚性的模具区域。优选地，适形模具区域由不可润湿的颗粒材料形成。

2. 发明授权

US06454030B1 Drill bits and other articles of manufacture including a layer-manufactured shell integrally secured to a cast structure and methods of fabricating same 有权
标题翻译：钻头和其他制品，包括一体地固定到铸造结构的层制造的壳体及其制造方法
公开(公告)号：US06454030B1
公开(公告)日：2002-09-24
申请号：US09236971
申请日：1999-01-25
申请人： Sidney L. Findley , Trent N. Butcher , Gordon A. Tibbits
发明人： Sidney L. Findley , Trent N. Butcher , Gordon A. Tibbits
IPC分类号： E21B1002
CPC分类号： E21B10/55 , B22F7/06 , B22F7/062 , B22F2005/001 , B22F2998/00 , B22F2998/10 , B22F2999/00 , B33Y80/00 , Y02P10/295 , B22F3/005 , B22F5/10 , B22F3/1055 , B22F3/26
摘要： A rotary-type earth-boring drill bit including a layer-manufactured, substantially hollow bit crown and an integral bit interior and bit gage. The bit interior and bit gage may be formed of a particulate material infiltrated with an infiltrant material. A particulate material of the bit crown may be integrally infiltrated with the particulate material of the bit interior and bit gage. Alternatively, the bit interior and bit gage may comprise a single cast material. The particulate material of the bit crown may be infiltrated with the cast material of the bit interior and bit gage. A method of fabricating the drill bit includes employing known layered-manufacturing techniques to fabricate the bit crown, positioning a bit gage mold adjacent the bit crown, and disposing a core material within an interior of the bit crown and a cavity of the bit gage mold. A mold that may be employed to fabricate the drill bit includes an initially conforming mold region, in which the pre-fabricated bit crown may be disposed, and a second, substantially rigid mold region including a cavity to define the gage of the drill bit. Preferably, the conforming mold region is formed of a non-wettable, granular material.
摘要翻译：一种旋转式钻孔钻头，其包括层制造的，基本上为中空的钻头牙冠和一体的钻头内部和钻头。钻头内部和位量可以由渗透材料渗透的颗粒材料形成。钻头顶部的颗粒材料可以与钻头内部和钻头量具的颗粒材料整体渗透。或者，钻头内部和钻头量规可以包括单个铸造材料。钻头顶部的颗粒材料可以用钻头内部和钻头量规的铸造材料渗透。一种制造钻头的方法包括采用已知的分层制造技术来制造钻头牙冠，将钻头牙冠定位在钻头牙冠附近，并将芯材料设置在钻头牙冠的内部和钻头盖模具的腔内。可用于制造钻头的模具包括最初配合的模具区域，其中可以设置预制的钻头顶部，以及包括用于限定钻头的量规的腔的第二基本上刚性的模具区域。优选地，适形模具区域由不可润湿的颗粒材料形成。

3. 发明授权

US06182774B2 Bit torque limiting device 失效
公开(公告)号：US06182774B2
公开(公告)日：2001-02-06
申请号：US09172509
申请日：1998-10-14
申请人： Gordon A. Tibbits
发明人： Gordon A. Tibbits
IPC分类号： E21B1000
CPC分类号： E21B44/04 , E21B17/04 , E21B17/073 , E21B17/076 , Y10T29/4987 , Y10T29/49899
摘要： A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a retaining member which restricts rotational movement of a first component of the torque limiting device relative to a second component. When a sufficient torque load is placed on the cutting structure of the drill bit, the retaining member allows rotational movement of the first component relative to the second component and allows the drill string to continue to rotate relative to the cutting structure of the bit until the torque is sufficiently reduced. The torque limiting device may be an integral part of a drill bit, may be a separate device attached between the drill string and the drill bit or between the drill string and a downhole motor, or may be part of a near-bit sub or incorporated in a downhole motor.

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