Truck bed extension apparatus

1. A truck bed extension apparatus for use in extending a usable area of a truck having a pickup box that defines an open end and that includes a primary tailgate pivotally movable about a pivot attaching the primary tailgate to the truck bed, between a closed configuration impeding the open end and an open configuration not impeding the open end, said bed extension apparatus comprising:

a hinge assembly comprising first, second, and third hinge plates and first and second hinges, said first hinge connecting said first and second hinge plates and said second hinge connecting said second and third hinge plates, wherein said first hinge plate is coupled to the primary tailgate, said first hinge plate having a front edge adjacent to and spaced inwardly from a free edge of the primary tailgate, said inward direction extending from the free edge toward the pivot;

an auxiliary tailgate having a lower edge coupled to said third hinge plate, said auxiliary tailgate being pivotally movable between a stowed configuration generally co-planar with and adjacent to the first hinge plate in which an entirety of said hinge assembly is spaced inwardly from said free edge of said primary tailgate, and a deployed configuration extending upwardly from and perpendicular to the first hinge plate in which said second hinge is spaced outwardly from said free edge of said primary tailgate;

a pair of side panels pivotally coupled to side edges of said auxiliary tailgate, respectively, each side panel being selectively movable between a retracted configuration generally co-planar with and bearing against an inside surface of said auxiliary tailgate and an extended configuration generally perpendicular to said inside surface of said auxiliary tailgate;

wherein the pickup box is extended and enclosed when the primary tailgate is at the open configuration, said auxiliary tailgate is at said deployed configuration, and said pair of side panels is at said extended configuration.

2. The truck bed extension apparatus as in claim 1 ,

wherein said auxiliary tailgate is pivotally movable to a released configuration generally perpendicular to the first hinge plate and situated in a direction opposite a direction when at said deployed configuration, wherein the auxiliary tailgate is supported by the second hinge which is disposed spaced outwardly from said free edge of said primary tailgate when at said deployed configuration.

3. The truck bed extension apparatus as in claim 2 , wherein:

said auxiliary tailgate is rotated about 90 degrees from said stowed configuration when moved to said deployed configuration;

said auxiliary tailgate is rotated about 180 degrees from said deployed configuration when moved to said released configuration;

said auxiliary tailgate is rotated about 270 degrees from said stowed configuration when moved to said released configuration.

4. The truck bed extension apparatus as in claim 3 , wherein said hinge assembly includes a rotational range of at least 270 degrees.

5. The truck bed extension apparatus as in claim 1 , wherein said hinge assembly includes a rotational range of at least 270 degrees.

6. The truck bed extension apparatus as in claim 1 , wherein

said second hinge plate is positioned adjacent the free edge of the primary tailgate and is perpendicular to said auxiliary tailgate when said auxiliary tailgate is at said deployed configuration; and

said second hinge plate is displaced from the free edge of the primary tailgate and is situated vertically and perpendicular to said first hinge plate at said stowed configuration.

7. The truck bed extension apparatus as in claim 1 , wherein said second hinge is positioned forwardly and in a common horizontal plane relative to said first hinge at said deployed configuration and said second hinge is positioned above and in a common vertical plane relative to said first hinge at said stowed configuration.

8. The truck bed extension apparatus as in claim 1 , further comprising means for selectively fastening free ends of said pair of side panels to the pickup box at said extended configurations, respectively.

9. A truck bed extension apparatus for extending a truck bed of a truck having a primary tailgate pivotally movable about a pivot attaching the primary tailgate to the truck bed, between a closed configuration preventing access to an open end of the truck bed and an open configuration allowing access to the open end, said truck bed extension apparatus comprising:

a hinge assembly that includes a first hinge plate coupled to the primary tailgate, said first hinge plate having a front edge spaced inwardly from an uppermost free edge of the primary tailgate, the inward direction extending from the uppermost free edge toward the pivot attaching the primary tailgate to the truck bed;

an auxiliary tailgate having a lower edge pivotally coupled to hinge plate assembly, said auxiliary tailgate being pivotally movable between a stowed configuration generally co-planar with and adjacent to the primary tailgate, in which an entirety of said hinge assembly is spaced inwardly from said uppermost free edge of said primary tailgate, and a deployed configuration extending upwardly from and perpendicular to the primary tailgate;

wherein said auxiliary tailgate is pivotally movable to a released configuration generally perpendicular to and extending downwardly from the front edge of the hinge plate and situated in a direction opposite a direction of said deployed configuration and in which said auxiliary tailgate is spaced outwardly from said uppermost free edge of said primary tailgate.

10. The truck bed extension apparatus as in claim 9 , further comprising:

a pair of side panels pivotally coupled to opposed side edges of said auxiliary tailgate, respectively, each side panel being selectively movable between a retracted configuration generally co-planar with and bearing against an inside surface of said auxiliary tailgate and an extended configuration generally perpendicular to said inside surface of said auxiliary tailgate;

wherein the truck bed is extended and enclosed when the primary tailgate is at the open configuration, said auxiliary tailgate is at said deployed configuration, and said pair of side panels is at said extended configuration.

11. The truck bed extension apparatus as in claim 9 , wherein:

said auxiliary tailgate is rotated about 90 degrees from said stowed configuration when moved to said deployed configuration;

said auxiliary tailgate is rotated about 180 degrees from said deployed configuration when moved to said released configuration;

said auxiliary tailgate is rotated about 270 degrees from said stowed configuration when moved to said released configuration.

12. The truck bed extension apparatus as in claim 11 , wherein said hinge assembly includes a rotational range of at least 270 degrees.

13. The truck bed extension apparatus as in claim 9 , wherein said hinge assembly includes a rotational range of at least 270 degrees.

14. The truck bed extension apparatus as in claim 9 ,

wherein said hinge assembly includes a double hinge member having a first hinge situated along said lower edge of said auxiliary tailgate, said auxiliary tailgate being pivotally movable between said deployed configuration and said released configuration by pivotal movement of said first hinge.

15. The truck bed extension apparatus as in claim 14 , wherein said double hinge member includes a second hinge displaced from said first hinge and pivotally coupled to said first hinge plate, said auxiliary tailgate being pivotally movable between said deployed configuration and said stowed configuration by pivotal movement of said second hinge.

16. The truck bed extension apparatus as in claim 15 , wherein:

said hinge assembly includes:

a second hinge plate intermediate said first hinge and said second hinge;

a third hinge plate extending rearwardly from said second hinge;

said second hinge plate is positioned adjacent the free edge of the primary tailgate and is perpendicular to said auxiliary tailgate when said auxiliary tailgate is at said deployed configuration; and

said second hinge plate is displaced from the free edge of the primary tailgate and is situated vertically and perpendicular to said first hinge plate at said stowed configuration.

17. The truck bed extension apparatus as in claim 15 , wherein said first hinge is positioned forwardly relative to said second hinge and in a common horizontal plane with said second hinge at said deployed configuration and said first hinge is positioned in a common vertical plane relative to said second hinge at said stowed configuration.

18. The truck bed extension apparatus as in claim 10 , further comprising means for selectively fastening free ends of said pair of side panels to the truck bed when said pair of side panels is at said extended configurations, respectively.