Patent ID: 7726724

Claim:
An aerodynamic device for mounting on a rear wall surface of a vehicle, the device comprising: first and second device halves that have a generally pyramidal shape when both halves are mounted adjacent to each other on the rear wall surface of the vehicle, each device half including: an upper support member having first and second ends, the first end being adapted to connect to an upper horizontal perimeter of the rear wall surface; a lower support member having first and second ends, the first end being adapted to connect to a lower horizontal perimeter of the rear wall surface, the second end of the lower support being operatively connected to the second end of the upper support member; and a flexible sheet connected along at least a portion of the upper support member and along at least a portion of the lower support member, the flexible sheet having first and second spaced-apart connection points, the first connection point adapted to connect to the upper horizontal perimeter of the rear wall surface in spaced relation to the first end of the upper support member, the second connection point adapted to connect to the lower horizontal perimeter of the rear wall surface in spaced relation to the first end of the lower support member; wherein the flexible sheet forms a generally half-pyramidal shape when the flexible sheet and the upper and lower support members are connected to the rear wall surface of the vehicle and wherein each device half lies generally flat against the rear wall surface when the lower support member is disconnected from the upper support member and the lower horizontal perimeter of the rear wall surface.