Cover, Coupling Element and Folder

A cover for at least partially enclosing a stack for application with a coupling tab stack, the stack comprising at least two sheets, the cover comprising:

• a front cover member for placing at the front side of the stack;
• a rear cover member for placing at the rear side of the stack and connected to the front cover member,
• a spine crease or spine part on a spine side for connecting the front cover member and the rear cover member at least in the assembled state with the stack, and
• front coupling means and/or rear coupling means comprising coupling tabs for coupling to coupling tabs sheets of the coupling tab stack of a respective front or rear cover member to the respective side of the stack.

A coupling element for mutually coupling two coupling tab stacks, comprising:

• front coupling means for coupling to a first of the two coupling tab stacks;
• and
• rear coupling means for coupling to a second of the two coupling tab stacks and connected to the first coupling means,
• wherein a folding crease is provided between the first coupling means and the second coupling means.

A folder for receiving one or more coupling tab stacks, comprising:

• a front cover member for placing at the front side of the stack;
• a rear cover member for placing at the rear side of the stack and connected to the front cover member;
• a spine crease on a spine side for connecting the front cover member and the rear cover member at least in the assembled state with the stack, and
• at least one coupling means for coupling the coupling tab stack.