Patent ID: 7793986

Claim:
An improved structure for book cover, comprising: a rigid left positioning plate having a protruded left binding portion; a rigid right positioning plate having a protruded right binding portion; wherein each binding portion has a reduced length compared to its corresponding positioning plate, so that top and bottom edges of said binding portions are recessed from the corresponding top and bottom edges of the positioning plates; and a cover layer, wherein the left and the right positioning plates are located on the cover layer, which has a relatively larger area, so that a space is reserved between the left and the right positioning plates without exceeding the area range of the cover layer, and a distance between any edge of the left and the right positioning plates and an edge of the cover layer closest thereto is kept for defining a folding border so as to facilitate the cover layer to be folded up inwardly to cover the edges of the left and the right positioning plates and form at least upper and lower folded edges, and the edges of the left and the right positioning plates which are adjacent to each other respectively have the protruded left binding portion and the protruded right binding portion which both have a plurality of holes corresponding to each other, the length of the left and right binding portions being less than the distance between the upper folded edge and the lower folded edge so that the top and bottom edges of the binding portions are not covered by the folding edges and the binding portions and the holes are exposed at the outer side so that loose leaf papers can be bound between the left and right positioning plates through a spiral.