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    • 3. 发明授权
    • Roof drill bit
    • 屋顶钻头
    • US4165790A
    • 1979-08-28
    • US910616
    • 1978-05-30
    • Kenneth C. Emmerich
    • Kenneth C. Emmerich
    • E21B10/38E21B10/58E21B9/02E21C1/14
    • E21B10/58E21B10/38
    • An improved drill bit for the mining field for use as a roof drill, tunnel drill, rock boring and highway construction, both as a rotary and a rotary percussion drill, which includes a drill head with a diametrical slot positioning a brazed cutting blade, the head having a male drive shank to interfit with a female driver tube and having axial passages leading to chip slash pockets for removal of chips either by incoming pressure fluid or outgoing suctioning action. The supporting prongs of the drill head on opposite sides and at opposite ends of the blade are narrowed in thickness to provide chip clearance and designed to overlap centrally to provide tip strength and central support for the blade.
    • 一种用于采矿领域的改进钻头,用作屋顶钻机,隧道钻机,岩石钻孔和公路建设,既作为旋转式和旋转式冲击钻,其包括具有定位钎焊切割刀片的直径槽的钻头, 头部具有一个男性驱动柄以与母型驾驶员管相配合,并且具有通向芯片斜槽的轴向通道,用于通过进入的压力流体或出口抽吸动作来移除芯片。 钻头的相对侧和刀片的相对端的支撑尖端的厚度变窄,以提供切屑间隙,并设计成中心重叠以提供刀片的尖端强度和中心支撑。