Abstract: The method comprises gripping the edges of a sheet of thermoplastic resin in a drawing frame, heating the sheet to a drawing temperature, drawing the sheet within the frame against a mold to a spheroidlike hemisphere, drawing an outstanding double-walled ridge about the transverse equator of the spheroidlike hemisphere and forming a central groove in the crest of the ridge. The spheroidlike hemisphere is divided, as by sawing or routing, along the groove at the crest of the ridge and across the undrawn material, thereby forming a pair of window well covers with the undrawn material at the frame providing a first flange of each, and the two walls of the ridge providing a second flange of the respective covers. The portion of the groove remaining with each separated ridge wall provides reinforcing curl along the edge of each second flange, while excess undrawn material may be removed to trim the first flange of each cover.

Abstract: A slip pallet formed as a square or rectangular sheet of a synthetic resin of selected types of polyolefin. The sheet is proportioned to fit upon a platen lift and includes tabs at each edge to be gripped when the platen is thrust underneath the sheet or the sheet is pulled upon or pushed off from the platen. The slip pallet will ordinarily carry loads of boxes formed as interlocking layers and an important feature of the invention resides in providing a sheet having a greater coefficient of friction at the upper surface whereon the boxes are placed, than at the undersurface which is contacted by the platen.