Patent ID: 7441971

Claim:
A spindle-mountable core for supporting a roll of web material, comprising: a tubular body having opposite ends, an outer surface for receiving and supporting a length of web material wound thereupon, and an axial bore for receiving a spindle inserted into said body from one end; a plurality of circumferentially spaced ribs extending axially along said bore and radially inwardly from said body, said ribs being constructed for slidable engagement with corresponding groove structure formed into the outer surface of a mounting spindle; stop means, disposed on said body adjacent the opposite end thereof and within said bore, for engaging a spindle inserted into said bore from said one end so as to limit the depth of insertion of the spindle into said body and thereby define a fully mounted position of said core on the spindle; and interference structure providing a substantially cylindrical contact surface, effectively circumscribing said bore, for frictional engagement with circumferentially disposed external contact means on a spindle in said fully mounted position of said core thereon, said interference structure extending axially along a major portion of said bore from adjacent said stop means toward said one end of said body, said body additionally providing a lead-in section extending inwardly from said one end thereof, along a minor portion of said bore, said lead-in section providing a cylindrical inside surface having a diameter larger than the diameter of said substantially cylindrical contact surface.