| 摘要 |
PURPOSE:To simultaneously display a plurality of fixation positions by a method wherein points of intersection of lines drawn by a laser beam on the ceiling are displayed as a plurality of fixation points for an appliance attached to the ceiling. CONSTITUTION:A quadrilateral 2a, 2b, 2c, 2d which forms a frame 2 is divided into four equal parts by partition sides 3a, 3b, 3c, 3d, line markers L1 to L6 which radiate laser beams toward a ceiling are buried in the quadrilateral 2a, 2b, 2c, 2d and in the two sides 3b, 3c out of the partition sides, the laser beams which are radiated from the line markers draw mutually orthogonal lines, and their points of intersection are displayed as a plurality of mounting positions for an apparatus attached to the ceiling. In addition, line marker-buried rods 7a, 7b, 7c, 7d are attached to extension lines from the partition sides 3a, 3b, 3c, 3d in the partition sides, and the appliance is positioned. |
