公开(公告)号：US4310269A

公开(公告)日：1982-01-12

申请号：US121994

申请日：1980-02-19

申请人： Horst W. Neu ,  Thomas Gilmore ,  Farrell A. McCann

发明人： Horst W. Neu ,  Thomas Gilmore ,  Farrell A. McCann

IPC分类号： B23B47/24 ,  B23B47/32 ,  B23Q11/04 ,  B23B47/18

CPC分类号： B23B47/32 ,  B23Q11/04 ,  Y10T408/16 ,  Y10T408/17 ,  Y10T408/172 ,  Y10T408/18

摘要： An improved power drill having means for sensing when the drill bit has penetrated through the workpiece and for then retracting the drill bit from the workpiece. An electrical signal responsive to the axial force between the drill and the drill bit is used to sense when the drill bit pierces the workpiece. A sudden decrease in the axial force triggers a mechanism for retracting the drill bit from the workpiece. Means are included to detect broken bits, missing bits and previously drilled holes.

摘要翻译： 一种改进的电钻，具有用于感测钻头何时穿过工件并且然后从工件回缩钻头的装置。 使用响应于钻头和钻头之间的轴向力的电信号来感测钻头何时刺穿工件。 轴向力的突然下降触发了将钻头从工件回缩的机构。 包括检测碎点，丢失位和以前钻孔的手段。