Tubular core assemblies for rolls of paper or other sheet material

A tubular core assembly for a roll of paper or other sheet material comprising:

• a hollow cylindrical core member formed of paperboard material, and
• an annular end member of plastic material within each opposite end portion of the core member, each end member having an outer annular surface secured to the inner annular surface of the core member and an inner annular surface shaped to receive a roll supporting chuck,
• each end member having a radially-projecting lug at the respective end of the tubular core assembly, said core member having a lug-receiving notch at each end receiving said lug of the respective end member to facilitate transmission of torque and axial chuck pressure from the end member to the core member,
• each end member also having a notch for receiving a projection of a roll supporting chuck, said notch extending inwardly from the respective end of the tubular core assembly immediately radially inwardly of the lug, and
• each end member having a plurality of circumferentially-spaced axially-extending channels in its inner annular surface to receive radially outwardly movable portions of a chuck, said channels including bottom portions extending axially and having side walls engageable by said chuck portions to enable rotational movement of the chuck to be transmitted to the end member, and said channels being circumferentially positioned in relationship to at least one feature of the core assembly which is visible to an operator when mounting the core assembly on the chuck, whereby observation of said feature indicates the position of said channels to the operator.