| 摘要 |
PURPOSE:To perform ventilation by resiliently energizing first and second movable blades in opposite directions by bias springs and shape memory springs having transformation temperatures different from each other thereby making the openings of first and second movable blades naturally and automatically communicate with each other without using any outside driving apparatus. CONSTITUTION:First and second shape memory springs 32 and 40, respectively, are transformed at temperatures different from each other. In a given set temperature range, the first and second shape memory springs 32 and 40 permit the openings of first and second fixed blades 18 and 24 and the first and second movable blades 32 and 40, respectively, to communicate with each other to allow the outside and inside air to automatically communicate with each other and, in the other temperature ranges, close the openings of the movable blade 22 (28) and the fixed blade 18 (24) of at least one of blade pairs. Therefore, a wind passage can be opened by combining the shape memory springs with transformation temperatures different from each other to make all the openings communicate with one another in the given set temperature range. Thus, a communication and ventilation can be simply and easily performed. |
