Ring Binder Mechanism with Automatic Locking Lever
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Solution Overview
Problem
Existing ring binder mechanisms fail to positively lock closed ring members together, leading to unintentional opening when accidentally dropped, and require operator intervention to engage locking structures, which can result in accidental opening if not properly positioned.
Innovation Solution
A ring binder mechanism with an elongate housing and pivotable hinge plates, featuring a travel bar and intermediate connector formed as one piece with a living hinge, allowing for automatic locking of the hinge plates when closed and easy opening with a lever mechanism that includes a hook and locking elements to prevent unintentional opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking structure is added to block hinge plates from pivoting when ring members are closed, then reliability is improved by preventing accidental opening, but device complexity increases
Solution Approach 1:
The locking structure is integrated into the existing lever mechanism, combining the opening/closing function with the locking function in a single unified system. The lever serves dual purposes: actuating the ring members open/closed and positioning the locking structure, thereby preventing accidental opening without adding separate complex locking components
Solution Approach 2:
The mechanism automatically locks when the ring members are closed through the lever's positioning, without requiring separate manual locking actions. The spring force automatically engages the locking structure to block hinge plate pivoting, making the system self-securing
2Reliability
If strong spring force is used to clamp closed ring members together, then reliability is improved by preventing accidental opening, but ease of operation deteriorates due to increased operator force requirement
Solution Approach 1:
The clamping function is segmented from the locking function. The spring provides moderate clamping force while a separate locking structure with lever provides the strong securing force needed to prevent accidental opening. This segmentation allows the spring force to be reduced since it doesn't need to provide both clamping and locking functions
Solution Approach 2:
The locking structure acts as an intermediary between the spring force and the hinge plates. Instead of relying solely on strong spring force to clamp the ring members, the locking structure mediates by providing mechanical blocking, thereby reducing the required spring force and making operation easier
3Reliability
If lever mechanism is used to move locking structure to block hinge plates, then reliability is improved by enabling positive locking, but ease of operation deteriorates due to additional manual positioning step
Solution Approach 1:
The lever mechanism merges the ring member actuation function with the locking structure positioning function. A single lever motion simultaneously opens/closes the ring members and positions the locking structure to block or allow hinge plate pivoting, eliminating the need for separate manual locking steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mechanism ensures secure locking of closed ring members without requiring strong spring forces, reducing operator effort and preventing accidental opening, while maintaining ease of operation and reliability.
Implementation Method 1
intermediate connector formed as one piece with a living hinge
Implementation Method 2
they deform the resilient housing and cause a spring force in the housing that urges the hinge plates to pivot away from the coplanar position
Data Source
AI summary
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.