Deployable aerodynamic device for rear of a cargo body

Abstract

This invention provides aerodynamic structures for the rear of a cargo body that move between a deployed position and a retracted position. The aerodynamic structures are typically three-sided, with a top panel and opposing side panels that form a partial cavity at the rear of the body. The panels employ tensioned flexible (e.g. fabric) panels or rigid/semi-rigid panels that are stowed, rolled, or folded in a retracted position against the rear of the door frame (for flexible panels) of the cargo body, or along the sides of the cargo body (for rigid/semi-rigid panels). The rigid/semi-rigid panels can be stored within nacelles that protect the panels and improve aerodynamic performance. Various linkages, including rotating rigid members attached to the rear of the body can coordinate movement between a top panel and side panels between deployed and retracted positions and a variety of powered and non-powered actuators can facilitate panel movement.

What is claimed is: 
     
         1 . An aerodynamic device for a rear of a cargo body comprising:
 a side panel mounted between a frame of the cargo body and to a support that hinges between a retracted position and a deployed position;   a mechanism that selectively biases the support to at least one of the retracted position and the deployed position;   a side take-up area into which the side panel is gathered in the retracted position;   a moving top frame member operatively connected to the support that coordinates movement of a top panel between the retracted position and the deployed position; and   a top take-up area into which the top panel is gathered in the retracted position.   
     
     
         2 . The aerodynamic device as set forth in  claim 1  wherein at least one of the side or top take-ups area includes a roller. 
     
     
         3 . The aerodynamic device as set forth in  claim 2  wherein the roller comprises a conical roller and the side panel defines a tapered structure in the deployed position. 
     
     
         4 . The aerodynamic device as set forth in  claim 1  wherein the mechanism that selectively biases the support is a spring. 
     
     
         5 . A device for a rear of a cargo body comprising:
 a side panel mounted between a frame of the cargo body and to a support that hinges between a retracted position and a deployed position, the support comprising a rotating member that is hingedly attached at or near a rear of the frame of the cargo body and at or near a trailing edge of the side panel;   a side take-up area into which the side panel is gathered in the retracted position;   a moving top frame member operatively connected to the support that coordinates movement of a top panel between the retracted position and the deployed position; and   a top take-up area into which the top panel is gathered in the retracted position.   
     
     
         6 . An aerodynamic device for a rear of a cargo body comprising:
 a side panel mounted between a frame of the cargo body and to a support that hinges between a retracted position and a deployed position;   a side take-up area into which the side panel is gathered in the retracted position;   a moving top frame member operatively connected to the support that coordinates movement of a top panel between the retracted position and the deployed position; and   a top take-up area into which the top panel is gathered in the retracted position, wherein the side take-up area and the top take-up area are configured to retain the side panel and top panel away from a door of the cargo body to allow operation of the door and the side panel and top panel are configured to be in an aerodynamic tapered position in the deployed position.   
     
     
         7 . The aerodynamic device as set forth in  claim 6  further comprising an actuator coupled to the support. 
     
     
         8 . The aerodynamic device as set forth in  claim 7  further wherein the actuator comprises at least one of a mechanical spring, a gas spring, a driven lead screw, a linear motor, a rotating motor, a fluid motor, a fluid piston, or a combination thereof. 
     
     
         9 .- 15 . (canceled)