Patent ID: 7575388

Claim:
A binder for filing tools which binds sheets having a plurality of sheet hole parts aligned in the center, comprising a locking bar which corresponds to a front cover wherein two front cover parts formed from flat boards are connected to a back cover part by one side, respectively, and integrated, comprising: a space setting means wherein the sheets are placed such as to be held between the locking bar and the front cover and the distance between the locking bar and the front cover is set arbitrarily according to the number of sheets to be bound, wherein said back cover part comprises a plurality of key-shaped locking parts erected on the front surface thereof, the key-shaped locking part is penetrated through the sheet hole parts in said sheets, a plurality of tying parts are provided in said locking bar in positions corresponding to the positions of the key-shaped locking parts, and the sheets are held between the locking bar and front cover by each tying part being locked to the key-shaped locking part, wherein the locking bar comprises a tying part having a small diameter and a pressure part having a diameter larger than that of the tying part, and wherein, in the pressure part, the center axis line of the tying part is provided at a slant in a specific direction from the center axis of the pressure.