Spline joints and container having same

1. A container comprising:

a first wall panel having a first edge, the first edge having a first protrusion with a first contoured profile, the first contoured profile having at least one projection;

a second wall panel having a second edge, the second edge having a second protrusion with a second contoured profile, the contoured profile having at least one projection; and

a spline including a first channel that defines a recess with an interior profile, and a second channel separate from the first channel that defines a recess with an interior profile, wherein the first channel receives the first protrusion of the first wall panel such that the first contoured profile is complementary to a portion of the interior profile and wherein the second channel receives the second protrusion of the second wall panel such that the second contoured profile is complementary to a portion of the interior profile;

wherein the first wall panel further includes a mid-section extending from the first edge and the second wall panel further includes a mid-section extending from the second edge, wherein the first edge has a greater thickness than the thickness of the mid-section of the first wall panel and the second edge has a greater thickness than the thickness of the mid-section of the second wall panel.

2. The container of claim 1 , wherein the interior profile of each of the first and second channels includes four sides.

3. The container of claim 2 , wherein the four sides are rectangular-shaped with adjacent sides of the four sides being perpendicular to one another.

4. The container of claim 1 , wherein the first and second protrusions are offset inward toward an interior of the container from a plane that is defined by an interior surface of the wall panels.

5. The container of claim 1 , wherein the first contoured profile extends an entire length of the first edge from a top edge of the first wall panel to a bottom edge of the first wall panel and wherein the second contoured profile extends an entire length of the second edge from a top edge of the second wall panel to a bottom edge of the second wall panel.

6. The container of claim 1 , wherein the first and second channels open in opposite directions.

7. The container of claim 6 , wherein the first and second channels are symmetrical to each other about a plane that extends through the spline.

8. The container of claim 1 , wherein the spline further includes a central channel positioned between the first channel and the second channel.

9. The container of claim 8 , wherein the spline further includes slots through an interior wall of the central channel, the interior wall facing an interior of the container.

10. A container comprising:

a first contoured edge of a first wall panel;

a second contoured edge of a second wall panel; and

a spline with a first channel that receives the first contoured edge and a second channel that receives the second contoured edge to form a spline joint securing the first and second wall panels together, the first and second channels being symmetrical with openings in opposite directions;

wherein each of the first and second contoured edges includes a concavity containing an adhesive that bonds a surface of the respective first and second contoured edges with a surface of respective first and second channels of the spline.

11. The container of claim 10 , wherein the spline extends an entire length of the first contoured edge from a top edge of the first wall panel to a bottom edge of the first wall panel and an entire length of the second contoured edge from a top edge of the second wall panel to a bottom edge of the second wall panel.

12. The container of claim 10 , wherein the spline further includes a central channel positioned between the first and second channel.

13. The container of claim 12 , wherein the spline further includes slots through an interior wall of the central channel, the interior wall facing an interior of the container.

14. The container of claim 10 , wherein the container is a trailer having a chassis with wheels and a plurality of wall panels including the first and second wall panels, the first wall panel is a side wall panel of the trailer and the second wall panel is a front wall panel of the trailer.

15. The container of claim 10 , wherein the container is a trailer having a chassis with wheels and a plurality of wall panels including the first and second wall panels, the first wall panel is a first side wall panel of the trailer and the second wall panel is a second side wall panel of the trailer.

16. A method of assembling a container comprising:

providing a first wall panel with a first contoured edge and a second wall panel with a second contoured edge, the first wall panel and the second wall panel being held fixed relative to each other to define a space between the first and second contoured edges;

providing a spline with two symmetrical channels that open in opposite directions;

sliding the spline axially and simultaneously onto the first and second contoured edges and into the space therebetween so that a first one of the two symmetrical channels receives the first contoured edge, and a second one of the two symmetrical channels receives the second contoured edge to from a spline joint securing the first wall panel to the second wall panel; and

after the first and second wall panels are secured, applying an adhesive to a concavity on the first contoured edge to bond a surface of the first contoured edge with a surface of one of the two symmetrical channels, and applying an adhesive to a concavity on the second contoured edge to bond a surface of the second contoured edge with a surface of the other of the two symmetrical channels after the first and second wall panels are secured.

17. A container comprising:

a first wall panel having a first edge, the first edge having a first protrusion with a first contoured profile, the first contoured profile having at least one projection;

a second wall panel having a second edge, the second edge having a second protrusion with a second contoured profile, the contoured profile having at least one projection; and

a spline including a first channel that defines a recess with an interior profile, and a second channel separate from the first channel that defines a recess with an interior profile, wherein the first channel receives the first protrusion of the first wall panel such that the first contoured profile is complementary to a portion of the interior profile and wherein the second channel receives the second protrusion of the second wall panel such that the second contoured profile is complementary to a portion of the interior profile;

wherein each of the first and second contoured profiles includes a concavity containing an adhesive that bonds a surface of the respective first and second contoured profiles with a surface of the interior profile of the respective first and second channels of the spline.