A double-wall container comprises outer side walls integrally formed with semi-tubular ribs extending heightwise of the container and joined at their apices to the inner side walls of the container, and an outer bottom wall also integrally formed with semi-tubular ribs which extend transversely of t
A double-wall container comprises outer side walls integrally formed with semi-tubular ribs extending heightwise of the container and joined at their apices to the inner side walls of the container, and an outer bottom wall also integrally formed with semi-tubular ribs which extend transversely of the container and join at their apices to the inner bottom wall. The inner side walls of the container are formed with inwardly-curved corners extending heightwise of the container, and the outer side walls are formed with outwardly-curved corners extending heightwise of the container and complementing the inwardly-curved corners of the inner side walls to define therewith tubular columns at the corners of the container.
대표청구항▼
1. A double wall container, including inner and outer side walls joined together in spaced relationship, and inner and outer bottom walls joined together in spaced relationship; said outer side walls being integrally formed with semi-tubular ribs extending heightwise of the container and joined at t
1. A double wall container, including inner and outer side walls joined together in spaced relationship, and inner and outer bottom walls joined together in spaced relationship; said outer side walls being integrally formed with semi-tubular ribs extending heightwise of the container and joined at their apices to the inner side walls of the container. 2. The container according to claim 1, wherein said outer bottom wall is also integrally formed with semi-tubular ribs which extend transversly of the container and are joined at their apices to the inner bottom wall of the container. 3. The container according to claim 2, wherein said outer side walls are formed with corrugations of sinusoidal cross-section such that said semi-tubular ribs are of semi-cylindrical configuration. 4. The container according to claim 3, wherein said semi-tubular ribs in the bottom wall are also of semi-cylindrical configuration. 5. The container according to claim 4, wherein said outer bottom wall is integrally formed with flat sections joining said semi-cylindrical ribs to permit the container to stably rest on a flat supporting surface. 6. The container according to claim 1, wherein said container is of polygonal cross-section, said inner side walls are formed with inwardly-curved corners extending heightwise of the container, and said outer side walls are formed with outwardly-curved corners extending heightwise of the container and complementing said inwardly-curved corners of the inner side walls to define therewith tubular columns at the corners of the container. 7. The container according to claim 6, wherein said tubular columns are of cylindrical configuration. 8. The container according to claim 7, further including cylindrical strengthening members received within said cylindrical columns at the corners of the container. 9. The container according to claim 1, wherein the inner side wall and inner bottom wall have flat, smooth inner faces. 10. The container according to claim 1, wherein the upper end of the outer side walls are formed with a peripheral rib, and the bottom wall is formed with a peripheral recess for receiving the peripheral rib of another like container to permit a plurality of said containers to be stably stacked one on top of the other. 11. The container according to claim 1, wherein the outer bottom wall is formed with two spaced recesses extending transversly across the container on opposite sides of its center axis for receiving the fork arms of a forklift truck. 12. The container according to claim 1, wherein all said walls of the container are of plastic material. 13. The container according to claim, 1, wherein said container is of square cross-section. 14. A double-wall container, including inner and outer walls joined together in spaced relationship, characterized in that said inner walls are formed with inwardly-curved formations extending heightwise of the container and spaced around the periphery of the container, and that said outer side walls are formed with outwardly-curved formations extending heightwise of the container and complementing the inwardly curved formations of the inner walls to define therewith tubular columns spaced around the periphery of the container and extending for the complete height of the container. 15. A container according to claim 14, wherein the container is of polygonal cross-section, said inwardly-curved formations being formed at the corners of the inner side walls, and said outwardly-curved formations being formed at the corners of the outer side walls. 16. The container according to claim 14, further including strengthening members received within said tubular columns formed by said inner and outer side walls. 17. The container according to claim 14, wherein said outer side walls are integrally formed with semi-tubular ribs extending heightwise of the container and joined at their apices to the inner side walls of the container. 18. The container according to claim 17, wherein said outer side walls are formed with corrugations of sinusoidal cross-section such that the tubular ribs are of semi-cylindrical configuration. 19. The container according to claim 18, wherein said semi-tubular ribs in the bottom wall are also of semi-cylindrical configuration, and wherein said outer bottom wall is integrally formed with flat section joining said semi-cylindrical ribs to permit the container to stably rest on a flat supporting surface. 20. The container according to claim 14, wherein said outer bottom wall is also integrally formed with semi-tubular ribs which extend transversely of the container and are joined at their apices to the inner bottom wall of the container.
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