| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hole position measuring instrument capable of accurately measuring relative positions in a horizontal direction between an upper hole and a lower hole arranged in a vertically upper and lower direction by a simple and small-sized instrument. <P>SOLUTION: According to an embodiment, the hole position measuring instrument includes a plumb bob, a plumb line 12 whose lower end is fixed to the plumb bob, and a line fixing member 11 to which the upper end of the plumb line 12 is fixed and which is supported by an opening edge of an upper hole 1. A part supported by the opening edge of the upper hole 1 in the line fixing member 11 is located on one spherical surface, and the upper end of the plumb line 12 is fixed to the center position of the spherical surface. <P>COPYRIGHT: (C)2013,JPO&INPIT |
