Core chuck with positive engagement

A chuck for internally engaging the hollow core element of a roll of web material comprising:

• a chuck body having a cylinder portion with diameter slightly less than the inside diameter of a hollow core element with which said cylinder portion is to be used and a base portion with a diameter at least as great as that of said cylinder portion;
• said base portion having a clamp for securing said chuck coaxially on a spindle;
• said chuck body having two partially tapped bore holes through said chuck body each with a bore hole central axis line which, projected on a plane perpendicular to the cylinder portion axis, makes an acute angle (B) with a plane tangent to the cylinder at the outer entrance point of said bore, each said central axis line further making an acute angle (A) with the plane perpendicular to said cylinder portion axis, the angle (A) being between 20 degrees and 60 degrees and the angle (B) being between 30 degrees and 70 degrees;
• and
• at least one threaded element configured to engage rotatably in each said tapped bore hole having on a proximal end thereof a tool engageable configuration and on a distal end thereof at least two peripherally located tooth-like extensions for gouging engagement with the interior of a hollow core element;
• whereby gouging engagement with a core element is produced by rotational advancement of such a said threaded element to extend outside the periphery of said body cylinder portion.

A chuck for internally engaging a hollow core element comprising:

• a chuck body having a cylinder portion with transverse dimension slightly less than the inside diameter of a hollow core element with which said cylinder portion is to be used and a base portion with a transverse dimension greater than that of said cylinder portion;
• said base portion being configured to accept said chuck coaxially on a spindle or shaft;
• said chuck body having at least two bore holes through said chuck body each with a bore hole central axis line which, projected on a plane perpendicular to the cylinder portion axis, makes an acute angle (B) with a plane tangent to the cylinder at the outer entrance point of said bore, each said central axis line further making an acute angle (A) with the plane perpendicular to said cylinder axis, the angle (A) being between 20 degrees and 60 degrees and the angle (B) being between 30 degrees and 70 degrees;
• and
• engagement elements configured to reside in each said bore hole and each having on a distal end thereof a pointed extension adapted to be forcefully contacted with the interior of a hollow core element;
• whereby forceful contact with a core element produced by advancement of such engagement elements to extend outside the periphery of said cylinder portion will restrain relative rotation between said chuck and said core element.