Collapsible container with a sliding lock feature

1. A collapsible container comprising:

a roof;

a base;

two opposing end walls, each end wall comprising an upper and a lower end wall panel pivotally attached to said roof and said base respectively, said upper end wall panel being horizontally pivotally attached to said lower end wall panel to permit inward folding of each of said end walls;

two opposing removable side walls fitting between said roof and said base;

at least one slide lock;

each slide lock riding along common lateral edges of said upper and lower end wall panels, wherein said slide lock prevents the inward folding of an end wall when in a locked position by traversing the horizontal axis about which the upper and lower end wall panels are pivotally attached to one another and allows the inward folding of an end wall when in an unlocked position by residing entirely within the upper end wall panel or entirely within the lower end wall panel;

said end walls and said side walls being a twinned wall structure defined by inner and outer wall members made of plastic;

wherein at least one of said side walls and said end walls has a plurality of elongated concave indentations, each concave indentation independently forming a substantially vertical internal arch between said inner and outer wall members, said arch being arcuately shaped and spanning the length of said concave indentation;

whereby said container is collapsible by removing said side walls and, with each slide lock in said unlocked position, inwardly folding said end walls to draw said roof closer to said base.

2. The container of claim 1 , wherein each of said side walls is partitioned into at least two removable side wall panels.

3. The container of claim 2 , wherein each of said side wall panels engage said roof and said base by complimentary upper and lower tongue and groove means respectively.

4. The container of claim 3 , wherein each of said side walls comprise first, second and third sequentially adjacent side wall panels.

5. The container of claim 4 , wherein each upper tongue and groove means has one or more sections dimensioned to loosely engage said first, second and third side wall panels, so that said first, second and third side wall panels can be removed from said container when aligned with said one or more sections.

6. The container of claim 5 , further comprising a locking means which prevents removal of said first, second or third side wall panels when aligned with said one or more sections.

7. The container of claim 6 , wherein said upper end wall panels are pivotally attached to end skirting walls extending downwardly from said roof.

8. The container of claim 7 , wherein said lower end wall panels are pivotally attached to end retaining walls extending upwardly from said base.

9. The container of claim 8 , wherein said end walls, said end retaining walls and said side walls have, along one lateral edge, a corner extension.

10. The container of claim 9 , wherein said corner extension on said end walls and said end retaining walls engage an adjacent edge of said side walls by a vertical tongue and groove means, and wherein said corner extensions on said side walls engage an adjacent edge of said end walls and said end retaining walls by a vertical tongue and groove means.

11. The container of claim 10 , wherein said third side wall panel in each side wall has attached to an upper edge, a rotatable cam lock, said cam lock allowing or preventing removal of said third side wall panels from said container.

12. The container of claim 11 , wherein said base has depending tine slots.

13. The container of claim 12 , wherein said roof has protrusions complimentary to said tine slots so that a plurality of containers can be stacked one on top of the other without slippage.

14. The container of claim 13 , wherein said side walls and said end walls are rotomolded plastic components.