Abstract: A drum with an adjustable depth is described. The drum includes a top head, a bottom head, and a shell. The shell is constructed such that the bottom head can be moved away from the top head, creating a drum with a different depth. The shell comprises an inner and outer shell. A handle can be turned, turning a drive sleeve in the interior of the drum. The drive sleeve translates the rotational motion into a vertical motion, changing the distance between the top and bottom heads. There may be an additional drive sleeve directly across from the initial drive sleeve, coupled via a drive shaft, to force the drum heads to move apart from each other in a substantially parallel manner. In a similar manner additional drive sleeves may be present to better keep the heads parallel.

Abstract: A sheet of thermoformable plastic material is positioned by air pressure adjacent a planar surface of a heating plate to heat and at least soften the sheet. The softened sheet is draped over a mold by the force of air pressure to form a molded part upon cooling. Registration pins engaging the sheet maintain the sheet in registration with the mold to insure correct positioning of any indicia on the sheet with corresponding elements of the mold. A plurality of sheets may be fused to one another during heating of the sheets.