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1. 发明授权

US5174396A Cutter assemblies for rotary drill bits 失效
标题翻译：旋转钻头组合切割机组
公开(公告)号：US5174396A
公开(公告)日：1992-12-29
申请号：US265018
申请日：1988-10-31
申请人： Malcolm R. Taylor , Joseph A. Gasan
发明人： Malcolm R. Taylor , Joseph A. Gasan
IPC分类号： E21B10/56 , E21B10/567
CPC分类号： E21B10/5673
摘要： A cutter assembly for a rotary drill bit comprises an elongate stud to be received in a socket in the surface of the bit body, the stud having mounted at one end thereof a preform cutting element. At least a major part of the stud is generally in the form of a cylinder of a circular cross-section having two symmetrically disposed flats extending longitudinally thereof, the flats being inclined towards the longitudinal axis of the stud as they extend towards the end of the stud remote from the cutting element. The flats allow the cutter assemblies to be packed together more closely side-by-side across a convexly curved surface of the body of the drill bit.
摘要翻译：用于旋转钻头的切割器组件包括待接收在钻头体的表面中的插座中的细长螺柱，所述螺柱在其一端安装有预成型件切割元件。螺柱的至少主要部分通常为圆形横截面的形式，其具有两个对称设置的纵向延伸的平面，当它们朝着螺栓的端部延伸时，平面朝向螺柱的纵向轴线倾斜螺柱远离切割元件。这些平面允许刀具组件在钻头本体的凸形弯曲表面上更紧密地并排堆放在一起。

2. 发明授权

US4987800A Cutter elements for rotary drill bits 失效
标题翻译：用于旋转钻头的刀具元件
公开(公告)号：US4987800A
公开(公告)日：1991-01-29
申请号：US371711
申请日：1989-06-26
申请人： Joseph A. Gasan , Malcolm R. Taylor , Phillip Bex
发明人： Joseph A. Gasan , Malcolm R. Taylor , Phillip Bex
IPC分类号： B23P15/28 , E21B10/56 , E21B10/567
CPC分类号： E21B10/567 , B23P15/28 , Y10S76/12
摘要： A preform cutting element, for a rotary drill bit, includes a layer of polycrystalline diamond material having a front cutting face, a rear face and a peripheral surface, a cutting edge being provided by at least part of the junction between the front cutting face and the peripheral surface. The diamond layer is formed around its periphery, adjacent the cutting edge, with a row of spaced apertures. Each aperture is in the form of a bore, formed for example by a laser, which is inclined at 45.degree. to the cutting face and extends completely through the diamond layer from the cutting face to the peripheral surface thereof. The apertures serve to inhibit the propagation of spalling across the cutting face from the cutting edge.

3. 发明授权

US4991670A Rotary drill bit for use in drilling holes in subsurface earth formations 失效
标题翻译：旋转钻头用于地下地层钻孔
公开(公告)号：US4991670A
公开(公告)日：1991-02-12
申请号：US433689
申请日：1989-11-08
申请人： John Fuller , Joseph A. Gasan
发明人： John Fuller , Joseph A. Gasan
IPC分类号： E21B10/56 , E21B10/567 , E21B10/60
CPC分类号： E21B10/567 , E21B10/60
摘要： A rotary drill bit for use in drilling holes in subsurface earth formations comprises a bit body having a shank at one end for connection to a drill string and an operating end face at the other end. A plurality of first cutting structures, each comprising a preform cutting element, is mounted in the bit body at the end face thereof, and each has a superhard front cutting face. The bit body includes a plurality of protuberances projecting outwardly from the adjacent portions of the end face, the protuberances forming a plurality of second cutting structures disposed in generally trailing relation, respectively, to at least some of the first cutting structures. Each of the protuberances is impregnated with superhard particles through a significant depth measured from the outermost extremity of the protuberance. At least a major operative portion of each of the second cutting structures is circumferencially separated from the respective leading first cutting structure by an open space, and is likewise radially separatred from the nearest adjacent second cutting structure or structures.
摘要翻译：用于在地下地层中钻孔的旋转钻头包括钻头体，其一端具有用于连接钻柱的柄部和在另一端处的操作端面。包括预成型件切割元件的多个第一切割结构在其端面安装在钻头体中，并且每个具有超硬前切割面。钻头体包括从端面的相邻部分向外突出的多个突起，突起形成多个第二切割结构，其分别以至少一些第一切割结构的形式分布地设置。每个突起都通过从突起的最外端测量的显着深度浸渍超硬颗粒。每个第二切割结构的至少一个主要操作部分通过开放空间与相应的引导第一切割结构环绕地分开，并且同样地从最近的相邻的第二切割结构或径向分开。

4. 发明授权

US4889017A Rotary drill bit for use in drilling holes in subsurface earth formations 失效
标题翻译：旋转钻头用于地下地层钻孔
公开(公告)号：US4889017A
公开(公告)日：1989-12-26
申请号：US187811
申请日：1988-04-29
申请人： John Fuller , Joseph A. Gasan
发明人： John Fuller , Joseph A. Gasan
IPC分类号： E21B10/56 , E21B10/567 , E21B10/60
CPC分类号： E21B10/567 , E21B10/60
摘要： A rotary drill bit for use in drilling holes in subsurface earth formations comprises a bit body having a shank at one end for connection to a drill string and an operating end face at the other end. A plurality of first cutting structures, each comprising a preform cutting element, is mounted in the bit body at the end face thereof, and each has a superhard front cutting face. The bit body includes a plurality of protuberances projecting outwardly from the adjacent portions of the end face, the protuberances forming a plurality of second cutting structures disposed in generally trailing relation, respectively, to at least some of the first cutting structures. Each of the protuberances is impregnated with superhard particles through a significant depth measured from the outermost extremity of the protuberance. At least a major operative portion of each of the second cutting structures is circumferencially separated from the respective leading first cutting structure by an open space, and is likewise radially separated from the nearest adjacent second cutting structure or structures.
摘要翻译：用于在地下地层中钻孔的旋转钻头包括钻头体，其一端具有用于连接钻柱的柄部和在另一端处的操作端面。包括预成型件切割元件的多个第一切割结构在其端面安装在钻头体中，并且每个具有超硬前切割面。钻头体包括从端面的相邻部分向外突出的多个突起，突起形成多个第二切割结构，其分别以至少一些第一切割结构的形式分布地设置。每个突起都通过从突起的最外端测量的显着深度浸渍超硬颗粒。每个第二切割结构的至少一个主要操作部分通过开放空间与相应的前进的第一切割结构环绕地分开，并且同样地与最近的相邻的第二切割结构或径向分开。

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