Patent ID: 9676221
Date: 2017-06-13
CPC Classifications: B42B,B42F

Claim:
1. A loose-leaf binder disposed on a loose-leaf book, the loose-leaf binder comprising: a back comprising a lower sheet and an upper sheet, wherein each of two sides of the back is formed with a track having a downward opening, at least one of two ends of the back is formed with an open end portion, each of two lateral side edges of the lower sheet is formed with a slightly upwardly projecting flange, and the lower sheet is formed with at least one engaging slot corresponding to at least one of two ends of the flange; and a loose-leaf coil selectively disposed below the back, wherein the loose-leaf coil is formed with continuous C-shaped portions by bending a wire, each of two ends of each of the C-shaped portions is formed with a track section which is slid in the track of the back, and the track section of the C-shaped portion is selectively engaged and restricted within the engaging slot of the lower sheet of the back.