公开(公告)号：US3773122A

公开(公告)日：1973-11-20

申请号：US3773122D

申请日：1972-06-07

申请人： PALAR CURACAO NV

发明人： CHROMY F

IPC分类号： E21B10/40 ,  E21B10/44 ,  E21B10/54 ,  E21C13/06

CPC分类号： E21B10/54 ,  E21B10/40 ,  E21B10/445

摘要： A rock drilling tool, such as used with a hammer drill, consists of an axially extending shank and a drilling tool head at one end of the shank which provides the rock drilling or cutting action. The drilling tool head includes a centrally positioned axially extending centering projection with at least three angularly spaced drilling fingers disposed radially outwardly from the centering projection and forming therebetween an annular recess which extends inwardly into the drilling tool head from the axial end surfaces of the drilling fingers. Each drilling finger has a drilling tooth on its axial end surface and a circle including the radially outer surfaces of the drilling teeth has a greater diameter than the diameter of the shank. The arrangement of the centering projection, the spaced drilling fingers and the annular recess affords efficient removal of drilled material and reduced friction between the hole being drilled and the drilling tool.

摘要翻译： 诸如与锤钻一起使用的凿岩工具包括轴向延伸的柄和在柄的一端处的钻具头，其提供岩石钻孔或切割动作。 该钻具头部包括一个居中定位的轴向延伸的定心突起，其中至少有三个角度间隔开的钻孔指状件从该定心突起径向向外设置，并在其间形成一个环形凹槽，该凹槽从钻孔手指的轴向端面向内延伸进入钻具头部 。 每个钻孔手指在其轴向端表面上具有钻齿，并且包括钻孔齿的径向外表面的圆的直径大于柄的直径。 定心突起，间隔开的钻孔手指和环形凹槽的布置能够有效地去除钻孔材料，并减少钻孔孔和钻孔工具之间的摩擦力。

公开(公告)号：US3861270A

公开(公告)日：1975-01-21

申请号：US29306472

申请日：1972-09-28

申请人： PALAR CURACAO NV ,  HILTI AG

发明人： ERNST URS ,  MEIER BEDA

IPC分类号： E04B1/41 ,  F16B13/10 ,  F16B13/12 ,  F16B13/06

CPC分类号： F16B13/12 ,  F16B13/126

摘要： A straddling dowel is formed of a metal sleeve having a continuous bore from its trailing end to its leading end. Axially extending slots are formed in the sleeve for a portion of its axial length extending from the leading end. Within the sleeve an axially extending portion of its bore surface, extending from the leading end, is tapered in diverging relationship toward the trailing end. The outer surface of the sleeve is free of grooves in the spreading range and a portion of the outer surface in the spreading range, extending axially from the leading end, is tapered. At the trailing end of the sleeve, its outer surface has a frusto-conical shape widening toward the trailing end. A member is insertable into the bore of the sleeve for spreading it and the spreading member has a frusto-conically shaped portion directed toward the leading end of the bore.

摘要翻译： 跨接销由金属套筒形成，金属套筒具有从其尾端到其前端的连续孔。 在套筒中形成有轴向延伸的槽，其一部分轴向长度从前端延伸。 在套筒内，其孔表面的从前端延伸的轴向延伸部分朝向尾端呈分叉关系渐缩。 套筒的外表面在扩展范围内没有凹槽，并且在扩展范围内的从前端轴向延伸的外表面的一部分是锥形的。 在套筒的后端，其外表面具有向后端加宽的截头圆锥形状。 一个构件可以插入到套筒的孔中以使其展开，并且展开构件具有朝向孔的前端的截头圆锥形部分。