| 摘要 |
A fire door system is disclosed wherein the fire door is up closing in that it includes an up closing partition. Further, the fire door is fail-safe in that in the absence of continuous controls indicating that the fire door should remain open, counterweights to the partition urge the partition upwardly for closing the fire door. Additionally, the fire door includes pneumatic chambers that interact with the movement of the counterweights so that as the partition is closing, a build-up of pressure in the chambers slows the rate of closing so that the fire door closes without slamming even though the total time taken to close the fire is rapid. The fire door is particularly useful for preventing the spread of fire and fire byproducts from one side of a fire inhibiting wall to the other side through openings such as those provided for carrier transport systems.
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