A sheet binding device includes a first tooth-shaped member that has plural arranged teeth, and a second tooth-shaped member that has plural arranged teeth, bites the first tooth-shaped member to clamp and bind sheets in cooperation with the first tooth-shaped member, and is tilted relative to the first tooth-shaped member from a beginning of biting to a completion of biting.

A loose-leaf notebook and its binding structure are provided. The binding structure includes a base plate. The base plate is provided with binding strips and snapping holes corresponding to the binding strips. A bottom end of each of the binding strips is fixed on the base plate, and a top end of each of the binding strips is inserted into a corresponding snapping hole. Due to the elasticity of the material itself, hands will not be hurt during writing, and loose-leaf papers can be easily flipped. If a user needs to remove or change an order of the loose-leaf papers, the user can remove the binding strips from the snapping holes to easily change papers and perform rebinding. The binding structure can also be reused by replacing the loose-leaf papers of the loose-leaf notebook.

A loose-leaf notebook and its binding structure are provided. The binding structure includes a base plate. The base plate is provided with binding strips and snapping holes corresponding to the binding strips. A bottom end of each of the binding strips is fixed on the base plate, and a top end of each of the binding strips is inserted into a corresponding snapping hole. Due to the elasticity of the material itself, hands will not be hurt during writing, and loose-leaf papers can be easily flipped. If a user needs to remove or change an order of the loose-leaf papers, the user can remove the binding strips from the snapping holes to easily change papers and perform rebinding. The binding structure can also be reused by replacing the loose-leaf papers of the loose-leaf notebook.

A ring mechanism has pivoting hinge plates supported by a housing so pivoting of the hinge plates can open and close rings for holding the loose-leaf pages. The mechanism has an actuator including a lower arm for moving the hinge plates to open the rings and an upper arm for moving the hinge plates to close the rings. The upper arm has a hook thereon. An intermediate connector comprises a cross bar captured by the hook on the actuator. The intermediate connector connects a travel bar to the actuator so movement of the actuator to pivot the hinge plates causes longitudinal movement of the travel bar in the housing. A locking element is moveable with the travel bar between a locking position and non-locking position.

A ring mechanism for retaining loose-leaf pages includes a housing and ring members for holding loose-leaf pages that are moveable relative to the housing between an open and closed position. An actuation system moves the ring members and includes hinge plates pivotally mounted on the housing and an actuator actuating pivoting movement of the hinge plates. A travel bar of the actuation system is moveable by the actuator between a locked position blocking pivoting movement of the hinge plates and an unlocked position allowing pivoting movement of the hinge plates. The actuation system is adapted to deform while moving the travel bar from the locked position toward the unlocked position to delay the pivoting motion of the hinge plates from the movement of the actuator.

A ring mechanism for retaining loose-leaf pages includes a housing and ring members for holding loose-leaf pages that are moveable relative to the housing between an open and closed position. An actuation system moves the ring members and includes hinge plates pivotally mounted on the housing and an actuator actuating pivoting movement of the hinge plates. A travel bar of the actuation system is moveable by the actuator between a locked position blocking pivoting movement of the hinge plates and an unlocked position allowing pivoting movement of the hinge plates. The actuation system is adapted to deform while moving the travel bar from the locked position toward the unlocked position to delay the pivoting motion of the hinge plates from the movement of the actuator.

A ring mechanism has a housing and rings for holding loose-leaf pages. Pivoting hinge plates are supported in the housing. Each ring includes a pair of ring members, at least one of which is mounted on a hinge plate and movable to open and close the rings. A travel bar carries a plurality of locking elements or wedges. The travel bar is secured to the housing in a manner that limits vertical movement of the travel bar while allowing the travel bar to translate between a locked position in which opening of the rings is blocked and an open position in which the rings are open. The travel bar is biased to remain in the locked position when it is in the locked position. The travel bar is free of forces tending to move the travel bar to the locked position when the travel bar is in the open position.

A ring mechanism has a housing and rings for holding loose-leaf pages. Pivoting hinge plates are supported in the housing. Each ring includes a pair of ring members, at least one of which is mounted on a hinge plate and movable to open and close the rings. A travel bar carries a plurality of locking elements or wedges. The travel bar is secured to the housing in a manner that limits vertical movement of the travel bar while allowing the travel bar to translate between a locked position in which opening of the rings is blocked and an open position in which the rings are open. The travel bar is biased to remain in the locked position when it is in the locked position. The travel bar is free of forces tending to move the travel bar to the locked position when the travel bar is in the open position.

A ring mechanism has an elongate body made of a moldable polymeric material and rings for holding loose-leaf pages. Each ring includes a first ring member and a second ring member. The first ring members are movable relative to the housing and the second ring members between a closed position and an open position. At least one ring member for each ring is a separately formed ring member and comprises a ring portion and an anchor connected to the ring portion. The at least one separately formed ring member is formed separately from the body. The anchor of the separately formed ring member is secured to the body for pivoting movement relative to the body. The anchor can be received in a receptacle in the body adapted to receive the anchor.

A ring mechanism has an elongate body made of a moldable polymeric material and rings for holding loose-leaf pages. Each ring includes a first ring member and a second ring member. The first ring members are movable relative to the housing and the second ring members between a closed position and an open position. At least one ring member for each ring is a separately formed ring member and comprises a ring portion and an anchor connected to the ring portion. The at least one separately formed ring member is formed separately from the body. The anchor of the separately formed ring member is secured to the body for pivoting movement relative to the body. The anchor can be received in a receptacle in the body adapted to receive the anchor.