Locking Hinge Mechanism Requiring Lift-to-Unlock Folding
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Solution Overview
Problem
Folding playpens and play yards are prone to accidental folding by children, posing safety concerns for both children and adults.
Innovation Solution
A locking hinge mechanism with a housing and lock assembly that requires lifting to unlock, featuring movable portions constrained by angled slots and a spring biasing element, preventing accidental folding by ensuring limited relative motion before unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple hinge mechanism is used, then ease of operation is improved, but safety against accidental folding deteriorates
Solution Approach 1:
The lock assembly requires a preliminary lifting action before the hinge can be folded. The movable portions must first be raised to disengage from the tubular rails, and only then can the hinge be opened. This preliminary action prevents accidental folding by children who cannot perform the two-step operation.
Solution Approach 2:
The lock assembly incorporates a spring mechanism that dynamically responds to the lifting force applied. When the hinge is lifted, the spring allows the movable portions to rise and disengage from the rails. When released, the spring returns the movable portions to their locked position, providing automatic re-locking.
2Reliability
If a lock assembly requiring lifting is used, then safety against accidental folding is improved, but device complexity increases
Solution Approach 1:
The lock assembly merges multiple functions into a single integrated mechanism: the movable portions serve as both the locking elements and the levers that must be lifted to unlock. The spring mechanism combines the unlocking action with automatic re-locking, eliminating the need for separate locking and unlocking components.
Solution Approach 2:
The movable portions are nested within the housing structure, with the spring mechanism contained within the same space. The lock assembly integrates seamlessly into the hinge mechanism without requiring additional external components, maintaining a compact design.
3Reliability
If movable portions are positioned under tubular rails, then locking reliability is improved, but ease of unlocking deteriorates
Solution Approach 1:
The spring mechanism provides dynamic assistance during the unlocking process. When the hinge is lifted, the spring automatically propels the movable portions upward to disengage from the rails, reducing the force required by the user. The dynamic spring action compensates for the initial positioning of the movable portions under the rails.
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
Enhances safety by reducing the likelihood of accidental folding, making the playpens and play yards safer for children and easier to manage for adults.
Implementation Method 1
a spring biasing element, enabling automatic resetting after unlocking
Data Source
AI summary
A folding playpen or play yard frame and/or a locking hinge mechanism for a folding playpen or play yard frame of the type having tubular rails for supporting sides and a floor of the playpen or play yard. The locking hinge mechanism includes a housing and a lock assembly movably mounted to the housing. The lock assembly is pivotally attached to proximal portions of the tubular rails for locking and unlocking the rails relative to the housing. The lock assembly and housing are configured and adapted to require the locking hinge assembly to be lifted to effect limited relative motion between the housing and the proximal portions of the tubular rails prior to unlocking the lock assembly and permitting greater relative motion between the housing and proximal portions of the tubular rails. This provides greater safety against the hinge accidentally being folded or being folded by a child.