Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1999-05-12
2000-11-21
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361690, 361694, 361741, 361752, 361756, 3122232, 454184, 211 4117, 174 161, H05K 720
Patent
active
061512133
ABSTRACT:
A platform for holding a plurality of modules or printed circuit boards wherein the platform or chassis contains shutters placed over airflow openings in the platform. The shutters are normally closed and are opened by the act of inserting a module into the platform. The shutters are in the closed position in all slots not occupied by a module and are in the open state in all slots populated by a module. The shutters open as the module is inserted and close when the module is removed. The closed shutters prevent airflow from passing through the unpopulated slots and empty space within the platform, thus forcing the airflow to pass through the space in which the modules are present. The platform also comprises a means of controlling the number of fans that are operational in accordance with the number of modules installed in the platform. The fans closest to the modules inserted into the platform are operational while fans close to unpopulated slots are turned off. A switch or electrical contacts in the rear of the modules can be used to control the operation of the fans. In an alternative embodiment, the lower and/or the upper portion of the chassis comprises one or more one time twist off tabs for each slot that extend from the front to the rear of the platform. The twist off tabs for a slot are left intact for a slot not to be populated with modules. The tabs are removed for slots to be populated with a module.
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Ater Dan
Avitan Eli
3Com Corporation
Chervinsky Boris L.
Picard Leo P.
Weitz David J.
Zaretsky Howard
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