An adapter for hole circle sawing of the two hole saws at the same time, and serves as a guide in the case of existing holes. A fitting variant and a screw-in variant

• 1. 一种新型适应多型号钻径向孔接头夹具 [P] . 中国专利： CN102896506A . 2013-01-30
• 2. 一种新型适应多型号钻径向孔接头夹具 [P] . 中国专利： CN202804703U . 2013-03-20
• 3. A hand hole saw with removable saws and guides that allow for enlargement of existing holes [P] . NZ588192A . 2011-05-27

  机译： 带有可移动锯和导向装置的手动孔锯，可扩大现有孔的数量

• 4. Chain-sawing block has recesses in wood-support surface, guide elements, adapter, legs fitting into holes, and bearing elements [P] . 德国专利： DE10224277A1 . 2003-04-30

  机译： 链锯块在木质支撑表面上具有凹槽，导向元件，适配器，安装在孔中的支脚和轴承元件

• 5. Procedure for sawing staff-shaped workpieces into discs by means of internal hole saws, as well as internal hole saws for its execution. [P] . 德国专利： DE59003106D1 . 1993-11-25

  机译： 通过内部孔锯和内部孔锯将员工形工件锯切成圆盘的步骤。

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• 1. 某型号旋挖钻机在深孔硬地层等复杂工况环境下主卷扬液压系统存在问题及改进措施 [C] . 张成伟 . 第八届深基础工程发展论坛 . -1