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捷克某工厂改进了一种快速钻孔工具(如附图),使用起来很方便,简化了打孔操作。图中1是锥柄,后部与车床尾座孔配合,前端与接套2配合。3是卡头。手把4上有一个弧形槽,销子5就嵌在这槽
A factory in Czech has improved a quick-drilling tool (pictured) for ease of use and simplified drilling operations. Figure 1 is taper shank, the rear tail hole with the lathe with the front and the sleeve 2 with. 3 is the chuck. Handle 4 has an arcuate slot, pin 5 is embedded in this slot