| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a structure of heat treatment boat for a vertical heat treatment apparatus on several columns of which trays such as trays in ring form are placed almost horizontally and with a space between top and bottom. With this structure, the boat easily fixes a tray in ring form without welding. SOLUTION: A notch 4 extending from the upper end toward the lower end of a column 23 on front side is formed. A notch 6 is also formed on the periphery of the tray 3 in ring form. The periphery of the tray 3 in ring form is put in slots 20 of each of the columns 23-28 and a fixing rod 5 is threaded in a space formed by the notches 4 and 6 from the top toward the bottom to engage the tray 3 on the column 23. A protrusion 51 is provided on the periphery on the other side of the tray 3 in ring form. The tray 3 in ring form is rotated and engaged on the column 24.</p> |
