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An improved truck bed toolbox lid and a method of producing the same. The truck bed toolbox lid includes an outer metallic sheet layer comprising a generally rectangular top sheet member, a longitudinal front edge member, two lateral edge members and a longitudinal rear edge member. A metallic liner

An improved truck bed toolbox lid and a method of producing the same. The truck bed toolbox lid includes an outer metallic sheet layer comprising a generally rectangular top sheet member, a longitudinal front edge member, two lateral edge members and a longitudinal rear edge member. A metallic liner sheet member is disposed inside the top sheet member in edge contact abutment with beveled inside edges of the front and rear longitudinal edge members and the lateral edge members to create an internal cavity in which the liner is by stitch welding. One or more injection ports are provided through the liner sheet member through which a self-expanding and self-curing, relatively high-density, foam is injected. The stitch welded edge contacts leave non-welded, gas permeable junctions along the wedged cavity periphery at a funneled apex of the edge contacted boundary which facilitate expansion of the foam toward the outermost edges of the cavity.

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1. A truck bed toolbox lid comprising: a substantially flat metallic top sheet member having a depending front edge member, a depending rear edge member and depending lateral edge members;a substantially flat metallic liner sheet member joined to said top sheet member so as to define an internal cav

1. A truck bed toolbox lid comprising: a substantially flat metallic top sheet member having a depending front edge member, a depending rear edge member and depending lateral edge members;a substantially flat metallic liner sheet member joined to said top sheet member so as to define an internal cavity; anda rigid, expanded, cured foam disposed within said internal cavity and bonded to said top sheet member and said liner sheet member, characterized in that said foam is injected into said cavity in an uncured, unexpanded state and expands and cures so as to self-bond to the metallic surfaces of said top sheet member and said liner sheet member to form an integral, composite truck bed toolbox lid;said truck bed toolbox lid further comprising a hot melt adhesive sealing member disposed alonealong the perimeter of said liner sheet member, whereby upon cooling said hot melt adhesive sealing member forms a seal between the inside surface of said top sheet member and the outer edge perimeter of said liner sheet member to retain said foam within said internal cavity. 2. The truck bed toolbox lid of claim 1, further comprising a plurality of stitch weld joints connecting the outer edge perimeter of said liner sheet member to said top sheet member. 3. The truck bed toolbox lid of claim 1, wherein said foam is a high density polyurethane foam. 4. A truck bed toolbox lid comprising: a substantially flat metallic top sheet member having a depending front edge member, a depending rear edge member and depending lateral edge members;a substantially flat metallic liner sheet member joined to said top sheet member so as to define an internal cavity; anda rigid, expanded, cured foam disposed within said internal cavity and bonded to said top sheet member and said liner sheet member, characterized in that said foam is injected into said cavity in an uncured, unexpanded state and expands and cures so as to self-bond to the metallic surfaces of said top sheet member and said liner sheet member to form an integral, composite truck bed toolbox lid;characterized in that said lid remains uncrimped with no permanent set upon deflection up to approximately 6.25 inches under up to approximately 480 psi when said lid is secured on a horizontal platform with approximately half said lid extending beyond said platform and subjected to center pressure adjacent one of said lateral edge members. 5. A truck bed toolbox lid comprising: a substantially flat metallic top sheet member having a depending front edge member, a depending rear edge member and depending lateral edge members;a substantially flat metallic liner sheet member joined to said tontop sheet member so as to define an internal cavity; anda rigid, expanded, cured foam disposed within said internal cavity and bonded to said top sheet member and said liner sheet member, characterized in that said foam is injected into said cavity in an uncured, unexpanded state and expands and cures so as to self-bond to the metallic surfaces of said top sheet member and said liner sheet member to form an integral, composite truck bed toolbox lid;characterized in that said lid remains uncrimped with no permanent set upon deflection up to approximately 7.5 inches under up to approximately 490 psi when said lid is secured on a horizontal platform with approximately half said lid extending beyond said platform and subjected to corner pressure adjacent one of said lateral edge members. 6. The truck bed toolbox lid of claim 1, wherein said top sheet member is formed of an aluminum sheet having a thickness of approximately 0.063 mil. 7. The truck bed toolbox lid of claim 1, wherein said liner sheet member is disposed generally parallel to said top sheet member. 8. The truck bed toolbox lid of claim 1, wherein at least one of said front edge member, said depending rear edge member and said depending lateral edge members is a hemmed edge. 9. The truck bed toolbox lid of claim 1, wherein said internal cavity is approximately one half to three quarter inches in depth between said top sheet member and said liner sheet member. 10. A truck bed toolbox lid comprising: a substantially flat metallic top sheet member having a depending front edge member, a depending rear edge member and depending lateral edge members, wherein an edge perimeter is formed along the depending front, rear and lateral edge members;a substantially flat metallic liner sheet member joined to said top sheet member in edge contact abutment with said edge perimeter so as to define an internal cavity having a funneled, gas permeable apex boundary; anda rigid, expanded, cured foam disposed within said internal cavity and bonded to said top sheet member and said liner sheet member, characterized in that said foam is injected into said cavity in an uncured, unexpanded state, expands toward said funneled, gas permeable apex boundary and cures so as to self-bond to the metallic surfaces of said top sheet member and said liner sheet member to form an integral, composite truck bed toolbox lid;further comprising a plurality of stitch weld joints that fixedly couple the perimeter of said liner sheet member with said edge perimeter, such that gas permeable, non-welded gaps remain between said plurality of stitch weld joints. 11. The truck bed toolbox lid of claim 10, wherein said edge perimeter is beveled. 12. The truck bed toolbox lid of claim 4, wherein said liner sheet member is disposed generally parallel to said top sheet member. 13. The truck bed toolbox lid of claim 4, wherein at least one of said front edge member, said depending rear edge member and said depending lateral edge members is a hemmed edge. 14. The truck bed toolbox lid of claim 5, wherein said liner sheet member is disposed generally parallel to said top sheet member. 15. The truck bed toolbox lid of claim 5, wherein at least one of said front edge member, said depending rear edge member and said depending lateral edge members is a hemmed edge. 16. The truck bed toolbox lid of claim 10, wherein said top sheet member is formed of an aluminum sheet having a thickness of approximately 0.063 mil. 17. The truck bed toolbox lid of claim 10, wherein said liner sheet member is disposed generally parallel to said top sheet member. 18. The truck bed toolbox lid of claim 10, wherein at least one of said front edge member, said depending rear edge member and said depending lateral edge members is a hemmed edge. 19. The truck bed toolbox lid of claim 10, wherein said internal cavity is approximately one half to three quarter inches in depth between said top sheet member and said liner sheet member. 20. A truck bed toolbox lid comprising: a metallic top sheet member having depending front edge members defining an edge parameter;a metallic liner sheet member joined to said metallic top sheet member by a plurality of stitch weld joints that fixedly couple a perimeter to said liner sheet member with said edge perimeter, such that gas permeable, non-welded gaps remain between said plurality of stitch weld joints and thereby define an internal cavity having a gas permeable boundary; anda rigid, expanded, cured foam disposed into said internal cavity and said foam adhering to said metallic top sheet member and said metallic liner sheet member,wherein said metallic top sheet member, said foam and said metallic liner sheet member form an integral, composite truck bed toolbox lid. 21. The truck bed toolbox lid of claim 20, wherein said metallic liner sheet member is sized such that said metallic liner sheet member is substantially coextensive with said metallic top sheet member. 22. The truck bed toolbox lid of claim 20, wherein said metallic liner sheet member is disposed generally parallel to said metallic top sheet member. 23. The truck bed toolbox lid of claim 20, wherein said metallic liner sheet member and said metallic top sheet member are heated prior to deposing said foam. 24. A truck bed toolbox comprising: a metallic top sheet member having depending edge members;a flat metallic liner sheet member joined to said metallic top sheet member in a manner which defines a cavity therebetween; anda foam-forming material injected into said cavity such that foam formed thereby adheres to said metallic top sheet member and said metallic liner sheet member so as to form a strengthened composite truck bed toolbox lid; anda generally rectangular, generally tub-shaped, open-topped lower receptacle;wherein said lid is pivotally attached to said lower receptacle whereby the lid pivots upwardly to expose the interior of the lower receptaclesaid truck bed toolbox lid further comprising a hot melt adhesive sealing member disposed along the perimeter of said liner sheet member, whereby upon cooling said hot melt adhesive sealing member forms a seal between the inside surface of said top sheet member and the outer edge perimeter of said liner sheet member to retain said foam within said internal cavity. 25. The truck bed toolbox of claim 24, wherein a sufficient amount of the foam-forming material is injected into said cavity such that the lid can be deflected in excess of four inches while remaining uncrimped, with no permanent set, when said lid, before being joined to the lower receptacle, is secured on a horizontal platform with approximately half the length of said lid extending beyond said platform and said lid is subjected to center pressure adjacent one of said depending edge members. 26. The truck bed toolbox of claim 24, wherein a sufficient amount of the foam-forming material is injected into said cavity such that the lid can be deflected to 7.5 inches while remaining uncrimped, with no permanent set, when said lid, before being joined to the lower receptacle, is secured on a horizontal platform with approximately half the length of said lid extending beyond said platform and said lid is subjected to corner pressure adjacent one of said depending edge members. 27. The truck bed toolbox of claim 24, wherein said metallic liner sheet member is joined to said metallic top sheet member at a plurality of discrete locations with gaps therebetween through which gas can escape. 28. The truck bed toolbox of claim 24, wherein said metallic liner sheet member is joined to said metallic top sheet member by welding. 29. The truck bed toolbox of claim 24, wherein said metallic liner sheet member is joined to said metallic top sheet member by stitch welding. 30. The truck bed toolbox of claim 24, wherein the metallic top sheet member is 0.063 inch thick. 31. A truck bed toolbox lid comprising: a metallic top sheet member having depending edge members defining an edge perimeter;a substantially flat metallic liner sheet member joined to said top sheet member in a manner to form a cavity therebetween using a plurality of stitch weld joints at discrete locations that fixedly couple a perimeter of said liner sheet member with said edge perimeter whereby gas permeable, non-welded gaps remain between said plurality of stitch welded joints thereby providing a passageway for gas to escape; anda foam-forming material disposed into said cavity such that said foam-forming material forms a foam upon curing thereby adhering to said metallic top sheet member and said metallic liner sheet member so as to form a strengthened composite truck bed toolbox lid with gas escaping via the gaps during the curing of the foam-forming material. 32. A truck bed toolbox lid comprising: a metallic top sheet member having a depending front edge member, a depending rear edge member and depending lateral edge members;said edge members together defining an edge perimeter about said edge members;a metallic liner sheet member having a perimeter and being joined to said metallic top sheet member so as to define an internal cavity having a gas permeable boundary, anda rigid, expanded, cured foam disposed into said internal cavity and said foam adhering to said metallic top sheet member and said metallic liner sheet member,wherein said metallic top sheet member, said foam and said metallic liner sheet member form an integral, composite truck bed toolbox lid;further comprising a plurality of stitch weld joints that fixedly couple the perimeter of said liner sheet member with said edge perimeter such that gas permeable, non-welded gaps remain between said plurality of stitch welded joints. 33. A truck bed toolbox lid comprising: a metallic top sheet member having depending edge members that define an edge perimeter;a metallic liner sheet member having a perimeter and being joined to said top sheet member in a manner which defines a cavity therebetween; anda foam-forming material injected into said cavity such that said foam-forming material forms a foam upon curing thereby adhering to said metallic top sheet member and said metallic liner sheet member so as to form a strengthened composite truck bed toolbox lid;further comprising a plurality of stitch weld joints that fixedly couple the perimeter of said liner sheet member with said edge perimeter such that gas permeable, non-welded gaps remain between said plurality of stitch weld joints. 34. A truck bed toolbox comprising: a metallic top sheet member having depending edge members that define an edge perimeter;a metallic liner sheet member having a perimeter and being joined to said top sheet member in a manner which defines a cavity therebetween; anda foam-forming material injected into said cavity such that said foam-forming material forms a foam upon curing thereby adhering to said metallic top sheet member and said metallic liner sheet member so as to form a strengthened composite truck bed toolbox lid; anda generally rectangular, generally tub-shaped, open-topped lower receptacle;wherein said lid is pivotally attached to said lower receptacle whereby the lid pivots upwardly to expose the interior of the lower receptacle;further comprising a plurality of stitch weld joints that fixedly couple the perimeter of said liner sheet member with said edge perimeter such that gas permeable, non-welded gaps remain between said plurality of stitch weld joints. 35. A truck bed toolbox lid comprising: a metallic top sheet member having depending edge members that define an edge perimeter;a substantially flat metallic liner sheet member having a perimeter and being joined to said top sheet member with a cavity therebetween by a plurality of stitch weld joints at discrete locations that fixedly couple the perimeter of said liner sheet member with said edge perimeter such that gas permeable, non-welded gaps remain between said plurality of stitch weld joints, said gaps providing a passageway for gas to escape;a foam-forming material disposed into said cavity such that said foam-forming material forms a foam upon curing thereby adhering to said metallic top sheet member and said metallic liner sheet member so as to form a strengthened composite truck bed toolbox lid with gas escaping via the gaps during the curing of the foam-forming material. 36. A truck bed toolbox lid comprising: a metallic top sheet member having a depending front edge member, a depending rear edge member and depending lateral edge members;a metallic liner sheet member joined to said metallic top sheet member so as to define an internal cavity;a rigid, expanded, cured foam disposed into said internal cavity, said cured foam adhering to said metallic top sheet member and said metallic liner sheet member, wherein said metallic top sheet member, said foam and said metallic liner sheet member form an integral, composite truck bed toolbox lid and upon curing of said foam, the rigidity of the combination of said metallic top sheet member and said metallic liner sheet member is increased; andsaid lid remains uncrimped with no permanent set upon deflection up to approximately 7.5 inches under up to approximately 490 psi when said lid is secured on a horizontal platform with approximately half said lid extending beyond said platform and subjected to corner pressure adjacent one of said lateral edge members. 37. The truck bed toolbox lid of claim 36, wherein said metallic top sheet member is sized such that said metallic liner sheet member is substantially coextensive with said metallic top sheet member. 38. The truck bed toolbox lid of claim 36, wherein said metallic top sheet member is disposed generally parallel to said metallic liner sheet member. 39. The truck bed toolbox lid of claim 36, wherein said metallic liner sheet member and said metallic top sheet member are heated and said foam undergoes maximum expansion and cures in a relatively uniform time. 40. A truck bed toolbox lid comprising: a metallic top sheet member having a plurality of depending edge members that form an edge perimeter;a metallic liner sheet member joined to said top sheet member in a manner which defines a cavity therebetween;a foam-forming material injected into said cavity such that said foam-forming material forms a foam upon curing and adheres to said metallic top sheet member and said metallic liner sheet member so as to form a composite truck bed toolbox lid adapted to be attached to a truck bed toolbox; andfurther comprising a plurality of stitch weld joints that fixedly couple the perimeter of said liner sheet member with said edge perimeter, such that gas permeable, non-welded gaps remain between said plurality of stitch weld joints. 41. The truck bed toolbox lid of claim 40, wherein a sufficient amount of the foam-forming material is injected into said cavity such that said lid can be deflected in excess of four inches while remaining uncrimped, with no permanent set, when said lid is secured on a horizontal platform with approximately half the length of said lid extending beyond said platform and said lid is subjected to center pressure adjacent one of said depending edge members. 42. The truck bed toolbox lid of claim 40, wherein a sufficient amount of the foam-forming material is injected into said cavity such that the final product lid can be deflected to 7.5 inches while remaining uncrimped, with no permanent set, when said lid is secured on a horizontal platform with approximately half the length of said lid extending beyond said platform and said lid is subjected to corner pressure adjacent one of said depending edge members. 43. A truck bed toolbox, said tool box comprising: a lid formed from a metallic top sheet member having depending beveled edge members and a flat metallic liner sheet member having edges that are in substantially continuous abutment along the beveled edge members of said metallic top sheet member in a manner which defines a cavity therebetween,a foam-forming material injected into the cavity of the lid such that the foam adheres to said metallic top sheet member and said metallic liner sheet member that together form the lid so as to form a strengthened composite truck bed toolbox lid,a plurality of stitch weld joints that fixedly couple the perimeter of the metallic liner sheet member with said liner sheet member, said stitch weld joints including non-welded permeable gaps that permit air and gases to escape during manufacture of the lid,the beveled edge members of the metallic top sheet member providing a nozzle effect to facilitate the expulsion of air and gases through said gaps; andan open-topped lower receptacle having an upper perimeter that mates with, and may be closed by said lid;said open topped lower receptacle being pivotally attached to said lid such that said lid can be pivoted upwardly to expose the interior of open-topped lower receptacle. 44. The truck bed toolbox of claim 43, wherein said lid is formed from a sufficient amount of the foam-forming material injected into the cavity of said lid such that said lid can be deflected in excess of four inches while remaining uncrimped, with no permanent set, when said lid member, before being joined to the lower receptacle, is secured on a horizontal platform with approximately half the length of said lid extending beyond said platform and said lid is subjected to center pressure adjacent one of said depending edge members. 45. The truck bed toolbox of claim 43, wherein said lid is formed with a sufficient amount of the foam-forming material injected into said cavity such that said lid member can be deflected to 7.5 inches while remaining uncrimped, with no permanent set, when said lid, before being joined to the lower receptacle, is secured on a horizontal platform with approximately half the length of said lid extending beyond said platform and said lid is subjected to corner pressure adjacent one of said depending edge members. 46. The truck bed toolbox of claim 43, wherein, a hot melt seal is disposed along the gaps of the outer perimeter of said metallic liner sheet member and forms a seal between the inside surface of the corresponding top sheet member and the outer perimeter of the liner sheet member to retain said foam within the cavity of the lid after gas has escaped through said gas permeable gaps.