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发明授权
CN104968882B 挖掘工具 有权

挖掘工具
摘要：
本发明的内侧钻头(3)具备：供给孔，在内侧钻头(3)的顶端部开口；及排出槽(14)，形成于内侧钻头(3)的外周面并沿轴线方向延伸，供给孔具备：顶端吹气孔(15)，在内侧钻头(3)的顶端部的顶端面开口；及外周吹气孔(16)，在内侧钻头(3)的顶端部的外周面开口，在内侧钻头(3)的外周面形成有连通外周吹气孔(16)和排出槽(14)的外周槽(19)，外周槽(19)由环状钻头从径向外侧所包覆，并从外周吹气孔(16)朝向排出槽(14)，随着围绕轴线而逐渐向轴线方向的基端侧延伸。
摘要（英）：

The inner bit (3) is provided with: a supply hole which is open at the distal end portion of the inner bit (3); and a discharge groove (14) which is formed in an outer peripheral surface of the inner bit (3) and extends in the direction of the axial line. The supply hole is provided with: a distal end blow hole (15) which is open in a distal end surface of the distal end portion of the inner bit (3); and an outer peripheral blow hole (16) which is open in an outer peripheral surface of the distal end portion of the inner bit (3). An outer peripheral groove (19) via which the outer peripheral blow hole (16) communicates with the discharge groove (14) is formed in the outer peripheral surface of the inner bit (3). The outer peripheral groove (19) is covered with the ring bit from the outside in a radial direction and extends so as to be closer to the base end side in the direction of the axial line around the axial line toward the discharge groove (14) from the outer peripheral blow hole (16).

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