Stroller Folding Mechanism with Arc Joints to Prevent Hand Nipping
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Solution Overview
Problem
Conventional strollers pose a safety risk by creating 'scissor gaps' that can nip or shear users' hands during folding and unfolding, violating increasingly stringent safety standards.
Innovation Solution
A stroller design with a frame that includes a handgrip fixedly connected to an upper joint, a lower joint pivotally connected to the upper joint, and a rear joint pivotally connected to a rear tube, where the distance between the upper and rear joints remains larger than a safety threshold, and the joints are arc-shaped to avoid corners, eliminating the need for a connecting rod between the front and rear tubes, thus preventing hand-nipping gaps during folding and unfolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional stroller frame folding mechanism with connecting rod is used, then the frame can be folded and unfolded, but scissor gaps are created that can nip or shear hands
Solution Approach 1:
The patent removes the connecting rod component from the folding mechanism. By eliminating this component, the scissor gaps that cause hand nipping and shearing risks are removed, while the frame folding and unfolding functionality is maintained through the pivotally connected joints system
Solution Approach 2:
The patent employs arc-shaped joints instead of straight-line connecting mechanisms. The arc-shaped geometry of the joints creates a different运动 trajectory that eliminates the formation of dangerous scissor gaps during folding and unfolding operations, while maintaining operational ease
2Object-affected harmful factors
If the distance between joints is reduced to eliminate gaps, then hand safety is improved, but the frame structure may become compromised
Solution Approach 1:
The arc-shaped joints maintain adequate spacing between frame components while following a curved motion path that prevents hand entrapment. The curved geometry allows the joints to move along an arc trajectory, keeping the distance between upper and rear joints consistently greater than safety thresholds without compromising structural integrity
3Stability of the object's composition
If a connecting rod is used to link front and rear tubes, then the frame can fold properly, but additional scissor gaps are created between the rod and tubes
Solution Approach 1:
The connecting rod is completely removed from the design. Instead of having a rod that creates scissor gaps with the front and rear tubes, the patent uses a system of pivotally connected joints that achieve frame folding stability through rotational movement around arc-shaped joint centers, eliminating the source of additional scissor gaps
Data Source
AI summary
A folding stroller having a frame that can be arranged in at least a first configuration and a second configuration, the frame including a handgrip fixedly connected to an upper joint, a lower joint pivotally connected to the upper joint, the lower joint being fixedly connected to a front tube, a rear joint pivotally connected to the lower joint, the rear joint being fixedly connected to a rear tube, and a joint connecting rod connected to the lower joint, the rear joint, and the upper joint, wherein a distance between the upper joint and the rear joint is larger than a predefined threshold while the frame is in the first configuration, while the frame is in the second configuration, and while the frame is transitioning between the first configuration and the second configuration.