| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for vertically reciprocatively lifting the delivery of air with a blower and the position of the blower in order to perform air circulation in an air conditioned heat treatment chamber.SOLUTION: A lifting and lowering frame 12 to which a connected blower 11 is assembled performs vertically reciprocative lifting movement along with travelling of a chain 5 loaded on a sprocket 4 attached to a driving shaft in accordance with normal and reverse rotations due to electric control of a driving motor 1 installed outside an air conditioned room 17. |
