High-strength, lightweight blow-molded plastic structures

A structure constructed from blow-molded plastic that includes a hollow interior portion formed that is integrally during the blow-molding process, the blow-molded plastic structure comprising:

• a first surface including a generally planar outer surface;
• a second surface that is spaced apart from the first surface, the first surface and the second surface enclosing at least a portion of the hollow interior portion formed during the blow-molding process;
• and
• a plurality of depressions integrally formed in the second surface, at least a majority of the plurality of depressions being disposed in a pattern, at least a majority of the depressions in the pattern having a generally uniform configuration, the pattern of depressions including at least one row and at least one column, each depression in the pattern of depressions having a height measured from the second surface to an end of the depression, the pattern of depressions covering at least a majority of the second surface, each depression in each row of depressions being spaced apart from an adjacent depression in the row of depressions by an average distance that is generally equal to or less than three times an average height of the depressions in the pattern, each depression in each column of depressions being spaced apart from an adjacent depression in the column of depressions by an average distance that is generally equal to or less than three times the average height of the depressions in the pattern.

A structure constructed from blow-molded plastic that includes a hollow interior portion formed during the blow-molding process, the blow-molded plastic structure comprising:

• an upper surface;
• a lower surface that is spaced apart from the upper surface, the upper surface and the lower surface enclosing at least a portion of the hollow interior portion formed during the blow-molding process;
• an average distance separating the upper surface and the lower surface;
• and
• a pattern of depressions integrally formed in the lower surface, the pattern of depressions including at least one row of depressions and at least one column of depressions, at least a majority of the depressions in the pattern having a generally uniform configuration, the pattern of depressions covering at least a majority of the lower surface, each depression in the pattern of depressions being spaced apart from an adjacent depression in the pattern of depressions by an average distance that is generally equal to or less than three times the average distance separating the upper surface and the lower surface.