Tube packing sheet with spaced support surfaces

Claim 1

A molded packing sheet of the type which is three dimensionally contoured for use in packing a stack of at least two superimposed layers of a plurality of elongated light tubes for storage and shipment, the sheet comprising (a) upwardly directed contours to position an upper layer of a plurality of tubes in closely spaced apart parallel relationship in a common flat plane, the upwardly directed contours including (i) at least two laterally concave tube cradling surfaces for each tube in the upper layer, the cradling surfaces being spaced apart longitudinally of the tube, and (ii) longitudinally extending narrow ribs upstanding between adjacent tubes packaged in the upper layer to prevent lateral contact between such adjacent tubes, and (b) downwardly directed contours to hold the rest of the sheet elevated thereabove, such contours including a series of flat support surfaces in a common flat plane, the improvement being that the series of flat support surfaces is arranged to maintain a lower layer of the same number of tubes directly below the upper layer and in the same relationship in a lower flat plane parallel with the upper flat plane, the series of support surfaces being in at least two laterally extending rows which are spaced apart longitudinally and including four outermost support surfaces one at each end of each row to provide two on each side of the sheet, and at least one support surface between adjacent tubes packaged in the lower layer, each support surface being laterally elongated with a width approximating the radius of a tube and a width to depth ratio which insures that the support surfaces will contact the upper part of the tubes in the lower layer and resist lateral shifting of the sheet and the upper layer of tubes packed therein with respect to the lower layer of tubes.