| 摘要 |
PURPOSE: To reduce the maintenance space of a board at the back surface side by eliminating the assurance of the removal of a back surface plate and the placing position of the removed plate in the case of checking and maintaining the back side of the board. CONSTITUTION: A plurality of stages of vertical guides 4 are longitudinally provided at both sides of the back surface side of a board main body 1, and upper and lower back surface plates 6, 5 are vertically movably provided at the guides 4. Grips 7, 8 energized in the inserting direction are provided movably in the inserting and removing direction at the plates 5, 6, the ends of the grips 7, 8 are inserted to the holes provided at the guides 4 and between the guides 4 to fix the plates 5, 6 to predetermined positions. |
