| 摘要 |
The present invention provides a draft control device for a chimney of a fireplace and the like. Basically, the device of the present invention comprises a generally hollow box-like member having six sides including one open side that can be fixed over the top of a chimney and a closed side opposite from that one side, and four other sides, including two sets of opposite sides, each having a vent. At least one shutter is pivoted on the member adjacent each of the side vents for movement by wind forces and rigid linkage means are provided for pivotally interconnecting the shutters for each of the sets of the vented opposite sides of the member to provide two shutter sets wherein one shutter for each of the two sets of opposite vented sides of the member will be moved away from its vent when the other shutter of the set is moved towards its vent by pivotal movement of the one shutter of the set by the wind forces. In particular accordance with the present invention, the linked shutters of one of the two shutter sets have their pivotal mountings to the member offset from those of the other of the shutter sets so as to avoid jamming of the linkage means.
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