A binding device (10) is provided which can be performed opening/closing of binding rings smoothly; comprising a plurality of openable/closable binding rings (12, 14), a holding member (16), an operating member (18), and an opening/closing member (40); the operating member comprises a pair of operating pieces (30, 32); base portions of one and the other of the binding rings are secured to the operating pieces respectively; the binding device has a button member (80) in the vicinity of one and/or the other end portion of the operating member; the button member has a first and a second arm portion (800, 820) for moving the one of the operating pieces; and the first and second arm portions are respectively configured to move the operating piece (30) to the first arm portion and to move the operating piece (32) to the opposite side to the second arm portion.

A binding device (10) is provided which can be performed opening/closing of binding rings smoothly; comprising a plurality of openable/closable binding rings (12, 14), a holding member (16), an operating member (18), and an opening/closing member (40); the operating member comprises a pair of operating pieces (30, 32); base portions of one and the other of the binding rings are secured to the operating pieces respectively; the binding device has a button member (80) in the vicinity of one and/or the other end portion of the operating member; the button member has a first and a second arm portion (800, 820) for moving the one of the operating pieces; and the first and second arm portions are respectively configured to move the operating piece (30) to the first arm portion and to move the operating piece (32) to the opposite side to the second arm portion.

A binding tool for paper sheets includes a base member extending in a longitudinal direction; and a plurality of first binding members and second binding members each having a base end portion formed protruding outward in a width direction from the base member and a tip end portion integral with the base end portion and curved inward in the width direction so as to be movable between a binding position where the tip end portions contact each other and an open position where the tip end portions are separated from each other by a prescribed distance. The base end portions are positionally displaced from each other by at least an amount corresponding to a thickness TH of the base end portion in the longitudinal direction when the tip end portions positioned facing each other in the width direction are in contact with each other in the binding position.

A binding tool for paper sheets includes a base member extending in a longitudinal direction; and a plurality of first binding members and second binding members each having a base end portion formed protruding outward in a width direction from the base member and a tip end portion integral with the base end portion and curved inward in the width direction so as to be movable between a binding position where the tip end portions contact each other and an open position where the tip end portions are separated from each other by a prescribed distance. The base end portions are positionally displaced from each other by at least an amount corresponding to a thickness TH of the base end portion in the longitudinal direction when the tip end portions positioned facing each other in the width direction are in contact with each other in the binding position.

A binding tool for paper sheets includes a base member extending in a longitudinal direction; and a plurality of first binding members and second binding members each having a base end portion formed protruding outward in a width direction from the base member and a tip end portion integral with the base end portion and curved inward in the width direction so as to be movable between a binding position where the tip end portions contact each other and an open position where the tip end portions are separated from each other by a prescribed distance. The base end portions are positionally displaced from each other by at least an amount corresponding to a thickness TH of the base end portion in the longitudinal direction when the tip end portions positioned facing each other in the width direction are in contact with each other in the binding position.

A binding tool for paper sheets includes a base member extending in a longitudinal direction; and a plurality of first binding members and second binding members each having a base end portion formed protruding outward in a width direction from the base member and a tip end portion integral with the base end portion and curved inward in the width direction so as to be movable between a binding position where the tip end portions contact each other and an open position where the tip end portions are separated from each other by a prescribed distance. The base end portions are positionally displaced from each other by at least an amount corresponding to a thickness TH of the base end portion in the longitudinal direction when the tip end portions positioned facing each other in the width direction are in contact with each other in the binding position.

A binding tool for paper sheets includes: a base member extending in a longitudinal direction; and a plurality of first binding members and second binding members each having a base end portion formed protruding outward in a width direction from the base member and a tip end portion integral with the base end portion and curved inward in the width direction so as to be movable between a binding position where the tip end portions contact each other and an open position where the tip end portions are separated from each other by a prescribed distance. The base end portions are positionally displaced from each other by at least an amount corresponding to a thickness TH of the base end portion in the longitudinal direction when the tip end portions positioned facing each other in the width direction are in contact with each other in the binding position.

A binding tool for paper sheets includes: a base member extending in a longitudinal direction; and a plurality of first binding members and second binding members each having a base end portion formed protruding outward in a width direction from the base member and a tip end portion integral with the base end portion and curved inward in the width direction so as to be movable between a binding position where the tip end portions contact each other and an open position where the tip end portions are separated from each other by a prescribed distance. The base end portions are positionally displaced from each other by at least an amount corresponding to a thickness TH of the base end portion in the longitudinal direction when the tip end portions positioned facing each other in the width direction are in contact with each other in the binding position.

A binding tool for paper sheets includes: a base member extending in a longitudinal direction; and a plurality of first binding members and second binding members each having a base end portion formed protruding outward in a width direction from the base member and a tip end portion integral with the base end portion and curved inward in the width direction so as to be movable between a binding position where the tip end portions contact each other and an open position where the tip end portions are separated from each other by a prescribed distance. The base end portions are positionally displaced from each other by at least an amount corresponding to a thickness TH of the base end portion in the longitudinal direction when the tip end portions positioned facing each other in the width direction are in contact with each other in the binding position.

A loose-leaf folder device includes a pair of main components. First half retaining rings and second half retaining rings are arranged on the housing of the main components. Two main components can be combined with or separated from each other. When combined together, the first half retaining ring can be combined with the first half retaining ring of the other main component to form a closed retaining ring to retain loose-leaf paper. When separated from each other, the main component along with loose-leaf paper retained by it can be separated from the other main component to form two independent parts. The second half retaining ring on the housing can rotate and can form a closed retaining ring with the corresponding first half retaining ring to retain loose-leaf paper.