据美国《工程新闻记录》第199卷1号报道,一种具有偏心式钻头的钻机,它能钻入所有的土壤,并以高速度钻入基岩之中。这种钻机的套管不需要转动,所以可以用比较便宜的普通标准钢材制造,既可以焊接,也可以用螺纹来连接。钻头的有效直径有φ76、φ114、φ127(毫米)等3种,由于钻头具有延伸的偏心扩孔器,故可钻较大的孔。它们可以用于钻勘探孔、岩石锚固孔、钻井以及其他的用途 According to the U.S. Engineering News Record, Vol. 199, No. 1, a rig with an eccentric drill bit can drill into all the soil and drill into the bedrock at a high speed. The bushing of this rig does not need to be turned, so it can be made of the cheaper common standard steel, either welded or screwed. Drill effective diameter φ76, φ114, φ127 (mm), etc. 3, due to the extension of the drill has an eccentric reamer, it can drill larger holes. They can be used for drilling holes, rock anchors, drilling and other applications