Back to results
US 8,556,206 B2Granted
Folded core for carpeting
AssigneeSonoco Development, Inc.
InventorDidier Eckert
Life of this patent
Estimating the term…
Abstract
A core for winding floor covering material, the core being a hollow, wound paper tube having an integrally formed longitudinally oriented indentation configured to accommodate the starting edge of the floor covering material. The core eliminates the longitudinal crease often found on the final few square meters of floor covering wound around a conventional core.
Claims4
A core for winding sheet material thereon, the sheet material having a starting edge, the core comprising:
- a hollow tube having a length, inner and outer facing surfaces and a central axis, the inner and the outer facing surfaces of the tube being asymmetrical about the central axis, the tube comprising a longitudinally oriented indentation extending the length of the tube, the indentation being partly defined by a longitudinal step and having a longitudinally oriented substantially concave shape adapted to accommodate the starting edge of the sheet material;
- wherein the core is shaped like a closed non-circular cylinder, the cylinder comprising a single spiral having a first end and a second end farther from the central axis than the first end, with the ends being connected by the longitudinal step, characterized in that the hollow tube is made of paper.
A core for winding sheet material thereon, the sheet material having a starting edge and a thickness, the core comprising a deformed hollow tube;
- wherein the deformed tube has a length, inner and outer facing surfaces and a central axis, the inner and the outer facing surfaces of the deformed tube being asymmetrical about the central axis;
- and
- wherein the deformed hollow tube is made by taking a hollow tubular structure having a circular cross section and making a longitudinally oriented indentation extending uniformly along the length of the hollow tube, the indentation having an asymmetrical cross section and comprising a relatively gradual sloping first side connected to a relatively steep second side, the indentation having a maximum depth approximately equal to the thickness of the sheet material and adapted to accommodate the starting edge of the sheet material.
Dependencies are inferred from the claim text.