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    • 9. 发明授权
    • Core drill
    • 核心钻
    • US5915894A
    • 1999-06-29
    • US957271
    • 1997-10-24
    • Kunio OkadaTatsuo MinakaHiroyuki Matsubara
    • Kunio OkadaTatsuo MinakaHiroyuki Matsubara
    • E21B21/00B23B45/14B23B47/34B28D1/04B28D1/14B23B41/02
    • B28D1/041B23B47/34Y10T408/554Y10T408/895
    • A core drill of dry type used for drilling through concrete structure or the like. A main shaft 23 rotatably driven by a motor 33 with a fan 32 is provided with a rubber ring 27 for allowing axial vibration of the shaft, and loosely supported by bearings 25 and 26 with a clearance between them so that it can be slightly tilted in the lateral and transverse directions. During drilling, a spacing between a diamond tip in a leading end of the core bit and a concrete structure or the like is changed as the core bit is moved in the vertical direction and tilted in the lateral and transverse direction, and chips produced by the drilling operation are efficiently discharged by injecting air from the fan 32 through an axial bore 22 in the shaft 23.
    • 用于通过混凝土结构等进行钻孔的干式钻芯。 由具有风扇32的马达33可旋转地驱动的主轴23设置有用于允许轴的轴向振动的橡胶环27,并且由轴承25和26以它们之间的间隙松动地支撑,使得其可以稍微倾斜 横向和横向。 在钻孔期间,芯钻头的前端中的金刚石尖端与混凝土结构等之间的间距随着芯钻头沿垂直方向移动并沿横向和横向倾斜而改变,并且由 通过从风扇32通过轴23中的轴向孔22喷射空气来有效地排出钻孔作业。