Abstract: A binding tool includes an elongated substrate, a pair of rotatable shafts, and engageable binding rings on the shafts. The shafts are rotatably supported on the substrate. An operation plate on the substrate is slidable along the shafts. The shafts have cam protrusions. The operation plate has cam grooves acting on the cam protrusions to rotate the shafts. When the operation plate is in one end position, the cam protrusion rotates the shaft to separate the binding rings. In the other end position, the shaft is rotated to engage the binding rings. Each shaft has an engagement plate protruding toward the operation plate. The operation plate has at least one cutout and an engaging portion. The engagement plate engages with the engaging portion of the operation plate when the operation plate is in the one end position. The cutout is aligned with the engagement plate to release the engagement plate in other positions.

Abstract: A A binding tool including an elongated substrate (1); a pair of rotatable shafts (2, 2?), a plurality of first and second binding rings (3, 4) engageable with each other fixed on the shafts (2,2?), said shafts being rotatably supported on both side portions of the substrate; and a slidable operation plate (5) disposed along the shaft on the bottom surface of the substrate (1), movable in a longitudinal direction of the substrate (1) and having a fingerhold (8) on a front end thereof, each of the shafts (2, 2?) provided with a cam protrusion (6, 6?) and the operation plate (5) provided with a cam groove (7) acting on the cam protrusion (6, 6?)to thereby rotate each of the shafts (2, 2?), wherein when the operation plate (5) is pushed in a push-in position, the shaft (2, 2?) is rotated in one direction via the cam protrusion (6, 6?) to thereby detach the first binding rings (3) from the second binding rings (4), and when the operation plate (5) is pulled in a pull-out position, the shaft (2, 2?) is rotated in

Abstract: For ring binders of externally fitted types it is an essential requirement that they do not interfere with the turning of loose leaves. Conventional binders have had too broad backbone plates supporting binder rings to permit smooth turning of the leaves. The invention provides a loose-leaf binder a loose-leaf binder comprising an elongate first backbone plate having a plurality of first binder half-rings formed at given intervals upright along its outer edge, and a second backbone plate having a plurality of second binder half-rings formed at given intervals upright along its edge opposite to that of the first backbone plate. The first and second backbone plates are adapted to be combined to close the first and second half-rings to form complete binder rings.

Abstract: [PROBLEM] For ring binders of externally fitted types it is an essential requirement that they do not interfere with the turning of loose leaves. Conventional binders have had too broad backbone plates supporting binder rings to permit smooth turning of the leaves.