Abstract: A loose-leaf binder includes a folding cover; a sheet retaining mechanism secured to a folding portion of the cover and comprising an elongated, rectangular recess, a slit at either end of the recess, a plurality of spaced concave members between both ends, and a plurality of spaced clamps between both ends; and a continuous wire having two straight ends and comprising a plurality of flexible spaced C-shaped rings connected together, the C-shaped rings being adapted to retain a plurality of sheets of paper. The ends of the wire are retained in the slits, a portion of the wire between both ends is fastened by the clamps, and the C-shaped rings are urged against the concave members.

Abstract: A spiral bound notebook includes a plurality of sheets of paper each having a plurality of equally spaced holes adjacent one side, each hole having a slit with one open end extending to the edge of one side of the sheet of paper; and a binding mechanism comprising a plurality of flexible C-shaped rings connected together. A removed sheet of paper can be intact without damage.

Abstract: A spiral bound notebook includes a plurality of sheets of paper each having a plurality of equally spaced holes adjacent one side, each hole having a slit with one open end extending to the edge of one side of the sheet of paper; and a binding mechanism having a plurality of flexible C-shaped rings connected together, each C-shaped ring including a recess on an intermediate portion prior to binding the sheets of paper. A removed sheet of paper can be intact without damage.

Abstract: A device for forming a loose-leaf holder of the loose0leaf notebook is composed of a cutting tool seat, a press seat, a locating seat, a position confining seat, a support arm, a sliding seat, a fastening seat, two rotating rods, a linking rod, and five cams. The device is capable of forming a loose-leaf holder which has two curved ends pointing towards each other such that the curved ends are prevented from making contact with a person's skin.