Patent attributes
A thermoformed packaging case has four wall-flanges which abut in ridge-within-groove nesting for interlocking and shock-absorbing closure of the case. Each edge has a pattern of ridges and grooves, and nesting of the edges of the flanges is enabled by a lateral shift in its ridge-groove pattern. Articles contained within the case are cushioned from shock by projections which protrude inwardly from inner surfaces of the walls to resiliently bear against the articles. Each buffer has a top surface surrounded by a valley and hump to provide shock-absorbing resilience. Locking of the case involves a flap hinged to a side-wall. To close a top-wall of the case onto the side-wall, projections of the top-wall enter recesses of the side-wall, and by folding the flap over to insert the projections into reverse recesses of the projections. The projections are snapped into recesses to effect triple-locking of the flap.
