Patent ID: 7758272

Claim:
A binding device for files and binders in which two binding rings to be inserted into two binding holes of an object to be bound are openably and closeably secured to a base plate so as to be opened and closed by an opening-closing mechanism including a rotationally movable lever, each of the at least two binding rings comprising: a first ring member having a semi-annular binding ring portion and a second ring member having a semi-annular binding ring portion, which define the binding ring, pivotally supported at respective pivot portions at respective lower ends thereof on the base plate; a junction at an end opposite to the pivot portion of the binding ring portion of the first ring member and a junction at an end opposite to the pivot portion of the binding ring portion of the second ring member joined together at an approximate center between the pivot portions of the first ring member and the second ring member; wherein the binding ring portion of the first ring member and the binding ring portion of the second ring member provide a ring-like shape which defines a closed loop; the first ring member and the second ring member are arranged to be interlocked with the opening-closing mechanism including the lever so as to be opened and closed about the respective pivot portions provided in the lower ends thereof by rotationally moving the lever; the first ring member and the second ring member are secured in an opened state when opened; the lever is secured such that the first ring member and the second ring member are maintained in the opened state; the opening-closing mechanism includes a pivot member arranged to rotationally move the lever, the pivot member being provided with an engaging portion which is engaged on the base plate side when the lever is rotationally moved to a position at which the binding ring is opened; an urging member is provided to rotationally move and simultaneously open the first ring member and the second ring member defining the binding ring; and the engaging portion is arranged to be engaged with the urging member to rotationally move and open the first ring member and the second ring member when the at least two binding rings are brought into the opened position.