초록 ▼

The synthetic resin container according to the present invention has a waist dividing a container main body portion into upper and lower parts, wherein the waist is formed on an annular groove surrounding the main body portion to as to be convex toward the interior of the container. The annular groo

The synthetic resin container according to the present invention has a waist dividing a container main body portion into upper and lower parts, wherein the waist is formed on an annular groove surrounding the main body portion to as to be convex toward the interior of the container. The annular groove has reinforcing ribs with a level higher than a groove bottom of the annular groove and lower than the surface of the main body portion. The container main body portion includes reinforcing lateral ribs each having a concave portion which is positioned at the same level as a surface of the container, which or forms a slight step relative to the surface of the container. The main body portion has a plurality of ridges converging toward the associated central convergent point, respectively, thereby defining multi-faceted concave walls inclined toward the associated convergent points, respectively.

대표청구항 ▼

The invention claimed is: 1. A synthetic resin container provided with at least one waist, which divides a main body portion of the container into upper and lower parts, wherein: said main body portion has a polygonal cross-section including four corner portions around said main body portion, said

The invention claimed is: 1. A synthetic resin container provided with at least one waist, which divides a main body portion of the container into upper and lower parts, wherein: said main body portion has a polygonal cross-section including four corner portions around said main body portion, said corner portions being a pillar comprising a longitudinally elongated nonplanar surface extending along a main axis of said container, said waist comprises an annular groove surrounding said main body portion so as to be convex toward the interior of said container, said annular groove is provided with reinforcing ribs each having a level higher than a groove bottom of said annular groove and lower than a surface of said main body portion, and each of said reinforcing ribs is arranged at a corner portion of the main body portion, each reinforcing rib having a width in the circumferential direction such that each end portion of each rib extends beyond an associated corner of the polygonal cross-section and into neighboring side surfaces of the waist. 2. The synthetic resin container according to claim 1, wherein each of said reinforcing ribs extends between said neighboring side surfaces as a single arc, as seen in the polygonal cross-section. 3. The synthetic resin container according to claim 1, wherein each of said reinforcing ribs has an accurate shape at its outer periphery. 4. A synthetic resin container obtained by a biaxial-stretching blow molding, comprising: a main body portion provided with reinforcing lateral ribs each having a concave portion which is flush at a first position with a surface of said container, and forms a slight step relative to said surface of said container at a second position, wherein: said main body portion has a quadrilateral cross-section including at least four locations around said main body portion, each location being a pillar comprising longitudinally elongated nonplanar surfaces, respectively, extending along a main axis of said container, each of said lateral ribs has a length such that the opposite ends of the lateral rib are short of the associated pillars, respectively, and said main body portion is provided with longitudinal ribs located between said lateral ribs and adjacent to said pillars. 5. The synthetic resin container according to claim 4, wherein said concave portions are formed at central regions of said lateral ribs, respectively. 6. The synthetic resin container according to claim 4, wherein said lateral ribs are projected inwardly of said main body portion of said container. 7. The synthetic resin container of claim 4, wherein said synthetic resin container is provided with pressure-reduction absorbing panels at said main body portion. 8. The synthetic resin container according to claim 4, wherein said longitudinal ribs projected inwardly of said main body portion. 9. The synthetic resin container according to claim 8, wherein said longitudinal ribs have concave portions around said longitudinal ribs themselves, respectively, and said concave portions are lower than a surface of said main body portion of said container. 10. A synthetic resin container obtained by biaxial-stretching blow molding, comprising: a main body portion provided with a plurality of ridges converging toward associated central convergent points, respectively, such that said ridges form multi-faceted concave walls inclined toward the associated convergent points, respectively, the main body portion provided with a plurality of longitudinal ribs, wherein each of said central convergent points has a lateral groove oriented perpendicularly to a main axis of said container. 11. The synthetic resin container according to claim 10, wherein said multi-faceted concave walls define a pressure-reduction absorbing panel. 12. The synthetic resin container according to claim 11, wherein said pressure-reduction absorbing panel exhibits a quadrilateral shape, and the associated ridges of said quadrilateral shape start from four corners of said quadrilateral shape to converge at the associated central convergent point.