Patent ID: 7134800

Claim:
A loose-leaf binder comprising a first base plate and a second base plate abutting against each other on their inner sides and each having a plurality of semicircular binder rings capable of abutting against each other, an elastic sheath for restraining outer edges of both the base plates to permit the binder rings to be opened and closed by elastic upward and downward movements of both the base plates, a second actuating member extending obliquely upwards from one end of the second base plate toward the first base plate and having at the upper end a second finger hooking portion, a first actuating member extending obliquely upwards from one end of the first base plate and intersecting the second actuating member, and a locking member interposed between the first actuating member and the second actuating member to lock the first and second actuating members when the binder rings are closed, wherein the locking member is a member integrally comprising a pivoted portion pivotally mounted in the first actuating member ( 10 ), an engaging projection which engages with an engaging recess of the second actuating member to prevent a movement of the second actuating member, an elastic portion which abuts against an upper surface of the first base plate to urge the engaging projection to the engaging recess, and a first finger hooking portion provided at a location opposite to a second finger hooking portion, whereby under a condition where the binder rings are closed, movements of both the base plates are prevented against an opening force acting upon the binder rings, and when both the finger hooking portions are pushed toward each other, the engaging projection is disengaged from the second actuating member against the elastic force of the elastic portion, and both the base plates are then moved in such directions as to open the binder rings.