Patent ID: 7828240

Claim:
A roll assembly for supporting a material web in a dispenser, comprising: a roll for supporting the material web, said roll having an axis and two ends for rotatably supporting the roll assembly in the dispenser; bearing journals projecting from the two ends of the roll, at least one of said bearing journals having: a circumferential groove and a free end insertable into a guide of the dispenser, said groove having side surfaces, a first of said surfaces being nearer said free end of said bearing journal; a bearing surface defining the bottom of said circumferential groove and defined by a surface of revolution around said axis; at least one centrally positioned recess formed in said free end of said bearing journal and open towards said free end; a fitting surface defined by a surface other than the surface of revolution around said axis, said fitting surface being formed in said at least one recess; and a guide surface formed in said circumferential groove by said first side surface nearer the free end of said bearing journal.