Hollow stackable product with curved sidestrips in longitudinal

Details Hollow stackable product with curved sidestrips in longitudinal Hollow stackable product with curved sidestrips in longitudinal

1996-05-20

1998-05-12

McDonald, Christopher T.

Envelopes, wrappers, and paperboard boxes

Paper or paperboard cup

229 45, B65D 306

Patent

active

057495149

ABSTRACT:
A hollow stackable injection-molded product includes a generally conically contoured sidewall having a plurality of longitudinal folds of alternating ridges and furrows. Each fold includes a first side strip laterally extending from the top of a first ridge to the bottom of a first furrow and a second side strip laterally extending from the bottom of the first furrow to the top of a second ridge next to the first ridge. Over most of the longitudinal extent of the sidewall, at least a predominant portion of each of the second side strips has an outward approximately conic-section lateral curvature to thereby provide a better fit between like products of such configuration when stacked inside one another and to thereby further reduce their stacking height. The lateral curvature of each second side strip is approximately circular. The lateral curvature of the individual second side strips is defined by a radius, with the length of the radius varying in accordance with only the longitudinal extent of the sidewall. The radii for the individual second side strips respectively extend from different points of origin on an approximately circular arc.

REFERENCES:
patent: 991246 (1911-05-01), Rosenfeld
patent: 1310698 (1919-07-01), Hill
patent: 1864836 (1932-06-01), Lacner
patent: 2041437 (1936-05-01), Sidon
patent: 2240045 (1941-04-01), Mackenzie
patent: 2459073 (1949-01-01), Hamilton
patent: 4284226 (1981-08-01), Herbst
patent: 5267685 (1993-12-01), Sorensen

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