Gopi N Nair
Engineers at Bahama Cir, Denver, CO
License number
Colorado 15039
Issued Date
Aug 18, 1977
Renew Date
Oct 31, 2002
Expiration Date
Oct 31, 2002
Type
Professional Engineer
Address
Address
5758 S Bahama Cir E, Denver, CO 80015
Professional information
Up Closing Fire Door
US Patent:
5642767, Jul 1, 1997
Filed:
Dec 13, 1995
Appl. No.:
8/571406
Inventors:
Gopi Nair - Aurora CO
Assignee:
TransLogic Corporation - Denver CO
International Classification:
E05F 1520
US Classification:
160 8
Abstract:
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.