Ring Binder Actuator with Flexible Arm for Safe Locking
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Solution Overview
Problem
Conventional ring binder mechanisms face challenges in balancing the spring force to prevent finger pinching during closure while ensuring the rings remain closed and do not inadvertently open, especially when dropped.
Innovation Solution
A ring mechanism with an elongate housing and actuator that includes a closing arm and an opening arm, along with a travel bar and locking element, allows for smooth single-step opening and closing, and automatic locking of the rings by sequencing the movement of the hinge plates and locking system to prevent accidental opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing applies a strong spring force to bias the ring members against movement toward the open position, then the rings remain securely closed, but there is a risk that a user could be injured by getting a finger pinched between the ring members as the housing causes them to snap shut during closing
Solution Approach 1:
The locking element is moved to the locked position before the ring members complete their closing motion. The actuator sequences the locking action to occur in advance, so that when the ring members reach the closed position, they are already secured and cannot snap shut with harmful force. This preliminary locking action maintains reliable closure while eliminating the pinching hazard.
Solution Approach 2:
The system transitions from a static spring force mechanism to a dynamic, sequenced operation where the locking element is positioned at different times relative to the ring closing motion. The actuator controls the timing, moving the locking element into position before the rings close and maintaining that locked state, thereby dynamically managing both security and safety.
2Object-affected harmful factors
If the housing applies a light spring force to reduce the risk of finger pinching, then user safety is improved, but the rings may inadvertently open (e.g., if the ring mechanism is accidentally dropped) and fail to retain loose-leaf pages
Solution Approach 1:
The locking element is advanced to the locked position before the ring members complete closing, ensuring that even with light spring force, the rings are secured against inadvertent opening. This preliminary locking action prevents the rings from popping open during dropping or handling while allowing the light spring force to maintain safety.
3Reliability
If a locking system is provided to block pivoting movement of the ring members from the closed position to the open position, then the risk of inadvertent opening is reduced, but the device complexity increases
Solution Approach 1:
The locking system is merged with the existing actuator mechanism. The actuator performs dual functions: it moves the ring members between open and closed positions, and it simultaneously positions the locking element to engage or disengage the locking feature. This integration eliminates the need for separate locking components and reduces overall device complexity.
Solution Approach 2:
The actuator is designed as a multi-functional component that both actuates the ring closing motion and controls the locking element positioning. This universal component performs multiple functions (ring actuation and locking control) that would traditionally require separate mechanisms, thereby reducing device complexity while maintaining reliable locking.
4Ease of operation
If the actuator is designed to deform during opening and closing to sequence movement of the travel bar with movement of the hinge plates, then single-step opening and closing operation is achieved, but the device complexity increases
Solution Approach 1:
The actuator incorporates controlled deformation (flexing) as a dynamic mechanism to sequence the motion of the travel bar relative to the hinge plates. This dynamic flexibility allows the single-step operation where pulling the actuator once sequentially unlocks, opens, and locks the rings, without requiring multiple discrete components or complex linkages.
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 effectively reduces the risk of finger pinching and ensures the rings remain closed while allowing easy opening and locking, enhancing user convenience and safety.
Implementation Method 1
the flexible arm 38 deforms during closing by bending in a direction (e.g., clockwise in FIG. 18) relative to the rest of the actuator that is opposite the direction (e.g., counterclockwise in FIG. 18) in which the actuator rotates during use of the actuator to close the rings
Data Source
AI summary
A ring mechanism has an elongate housing and rings for holding loose-leaf pages. Each ring has ring members mounted on pivoting hinge plates for movement between open and closed positions. An actuator has opening and closing arms extending from an actuator body for opening and closing the rings. The mechanism has a travel bar moveable between a locked position in which a locking element blocks pivoting movement of the hinge plates and an unlocked position. The actuator has a flexible arm positioned to push the travel bar toward the locked position when the actuator closes the rings. At least a portion of the flexible arm is adapted to deform during closing in a manner that includes rotation in a first direction relative to the body of the actuator. Movement of the actuator to close the rings includes rotation of the actuator in the first direction relative to the housing.