| 摘要 |
PROBLEM TO BE SOLVED: To provide a ventilating device capable of closing a passage without a power supply when the temperature is low or high. SOLUTION: A blade (not shown in the figure) is rotatably supported to the passage of a device body 20. An automatic opening/closing means 50 has a thermoelement 51 for changing the projecting quantity of an effector by the thermal expansion and thermal shrinkage of a fluid, and a cam 60. The cam 60 has first and second abutting parts 61x, 61y, and a follower part 65 provided at a rotating shaft part of the blade has first and second receiving parts. When the effector 51b of the thermoelement 51 retreats due to the drop of temperature from a prescribed temperature range, the cam descends, and the first abutting part 61x presses the first receiving part of the follower part 65 to close the blade. When the temperature rises from the prescribed temperature range, the second abutting part 61y presses the second receiving part of the follower part 65 to close the blade. COPYRIGHT: (C)2004,JPO
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