Patent ID: 8136643

Claim:
In a vehicle having a dynamic braking capability, a resistive grid assembly comprising: a first enclosure portion, wherein said first enclosure portion defines a first enclosure portion cavity; a second enclosure portion, wherein said second enclosure portion defines a second enclosure portion cavity having at least one second enclosure portion inlet, wherein said second enclosure portion is disposed adjacent to and separated from said first enclosure portion via a first enclosure portion wall, wherein said first enclosure portion wall includes at least one convection opening which communicates said first enclosure portion cavity with said second enclosure portion cavity; a third enclosure portion, wherein said third enclosure portion defines a grid cavity having at least one grid cavity outlet, wherein said third enclosure portion is disposed adjacent to and separated from said second enclosure portion via a third enclosure portion wall, wherein said third enclosure portion wall, includes at least one airflow opening which communicates said second enclosure portion cavity with said third enclosure portion cavity and wherein said third enclosure portion further includes at least one airflow directional device associated with said at least one grid cavity outlet to direct air flowing out of said at least one grid cavity outlet away from said at least one second enclosure portion inlet; at least one resistive grid located in said resistive grid cavity for use in a dynamic braking system; and at least one transfer duct portion, wherein said at least one transfer duct portion defines a duct cavity having at least one duct inlet and at least one duct outlet, wherein said at least one duct inlet is disposed to be associated with said grid cavity and wherein said at least one duct outlet is disposed within said first enclosure cavity to communicate said grid cavity with said first enclosure cavity.