A single-detent binder for a file folder has a housing, one pair of baseplates, ring shaped components, a control component, a pull rod, rotary locking pieces and an intermediate junction component. The control component, intermediate junction component, pull rod and rotary locking pieces are connected in series. When the control component rotates, the rotary locking pieces are triggered to rotate in the trough of the first baseplate based on the mechanical principle of connecting rod, thus performing the locking/unlocking function. When the binder is closed, the baffle plates on the second baseplate hinder the rotary locking pieces from rotation, thus generating a clamping force. After the baffle plates and rotary locking pieces work jointly to close the binder, the ring shaped components generate a scrambling force, thus enhancing the locking effect and preventing the single-detent binder from opening unexpectedly.

A single-detent binder for a file folder has a housing, one pair of baseplates, ring shaped components, a control component, a pull rod, rotary locking pieces and an intermediate junction component. The control component, intermediate junction component, pull rod and rotary locking pieces are connected in series. When the control component rotates, the rotary locking pieces are triggered to rotate in the trough of the first baseplate based on the mechanical principle of connecting rod, thus performing the locking/unlocking function. When the binder is closed, the baffle plates on the second baseplate hinder the rotary locking pieces from rotation, thus generating a clamping force. After the baffle plates and rotary locking pieces work jointly to close the binder, the ring shaped components generate a scrambling force, thus enhancing the locking effect and preventing the single-detent binder from opening unexpectedly.

A locking ring metal (10) includes binder rings (12, 14, 16) each formed by a pair of complementary shaped binder ring halves. Each ring half has an end attached to a frame (18, 20). The frames are movable relative to each other to open and close the binder rings. The frames are installed in housing (22) at one end of which a trigger (11) is mounted. A travel bar (34) installed within the housing above the frames and not connected to the trigger includes blocking elements (50) which, when in position, prevent movement of the frames to lock the binder rings in their closed position. A coil spring (48) attached to the travel bar and housing biases the travel bar in the direction to open the binder rings.

A locking ring metal (10) includes binder rings (12, 14, 16) each formed by a pair of complementary shaped binder ring halves. Each ring half has an end attached to a frame (18, 20). The frames are movable relative to each other to open and close the binder rings. The frames are installed in housing (22) at one end of which a trigger (11) is mounted. A travel bar (34) installed within the housing above the frames and not connected to the trigger includes blocking elements (50) which, when in position, prevent movement of the frames to lock the binder rings in their closed position. A coil spring (48) attached to the travel bar and housing biases the travel bar in the direction to open the binder rings.

A sheet includes a folding line along which the sheet is to be folded, and a mark with reference to which the sheet is placed on an image forming apparatus in a specific manner. The mark is provided in a portion that is positioned on an inner side when the sheet is folded along the folding line.

A sheet includes a folding line along which the sheet is to be folded, and a mark with reference to which the sheet is placed on an image forming apparatus in a specific manner. The mark is provided in a portion that is positioned on an inner side when the sheet is folded along the folding line.

A locking ring metal includes binder rings each formed by a pair of complementary shaped binder ring halves. The binder rings are of a gap free construction. Each ring half has an end attached a frame. The frames are movable relative to each other to open and close the binder rings and are installed in a housing at one end of which a trigger is mounted. A travel bar installed within the housing above the frames and not connected to the trigger includes blocking elements which fit into respective brackets formed on the underside of the frames when the binder rings are closed to lock the binder rings in their closed position. A coil spring attached to the travel bar and the housing biases the travel bar in the direction to open the binder rings.

A locking ring metal includes binder rings each formed by a pair of complementary shaped binder ring halves. The binder rings are of a gap free construction. Each ring half has an end attached a frame. The frames are movable relative to each other to open and close the binder rings and are installed in a housing at one end of which a trigger is mounted. A travel bar installed within the housing above the frames and not connected to the trigger includes blocking elements which fit into respective brackets formed on the underside of the frames when the binder rings are closed to lock the binder rings in their closed position. A coil spring attached to the travel bar and the housing biases the travel bar in the direction to open the binder rings.

A ring metal (M) installed in a binder (B) stores punched sheets of paper and the like. The ring metal includes binder rings (R) mounted on movable frames (F) to which one end of each ring half is attached. The frames are movable relative to each other to open and close the rings. A ring guard (10) is removably installable over a portion of each ring half, when the binder ring is closed, to securely encompass rings halves (12, 14) forming the ring. The guard encloses the junction (J) where outer ends of the ring halves meet when the rings are closed and prevents a gap from opening between the ring halves if the binder is subjected to a force which would otherwise cause a gap to form between the ring halves and paper stored in the binder to spill out or be damaged.

A ring metal (M) installed in a binder (B) stores punched sheets of paper and the like. The ring metal includes binder rings (R) mounted on movable frames (F) to which one end of each ring half is attached. The frames are movable relative to each other to open and close the rings. A ring guard (10) is removably installable over a portion of each ring half, when the binder ring is closed, to securely encompass rings halves (12, 14) forming the ring. The guard encloses the junction (J) where outer ends of the ring halves meet when the rings are closed and prevents a gap from opening between the ring halves if the binder is subjected to a force which would otherwise cause a gap to form between the ring halves and paper stored in the binder to spill out or be damaged.