Stroller Backrest Linkage for One-Handed Adjustment
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Solution Overview
Problem
Existing stroller backrest adjustment mechanisms require two hands to operate, making them inconvenient, and often feature complex structures that increase manufacturing costs and user complexity.
Innovation Solution
A stroller design with a linkage device that includes a handle connected to a pushing structure via a connecting component, allowing the backrest to be adjusted with one hand by moving the handle upward, which drives the pushing structure to rotate the backrest adjustor relative to the main frame, engaging and disengaging the positioning part from guide rails to set desired angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two grips are disposed at two sides of the stroller for adjusting the backrest angle, then the backrest can be adjusted to different positions, but the user needs to use two hands to operate simultaneously which reduces ease of operation
Solution Approach 1:
The patent combines two separate gripping operations into a single linkage device. The linkage device includes a first gripping part and a second gripping part connected through connecting components, allowing the user to operate both sides of the backrest adjustment mechanism simultaneously with one hand. This merging of operations directly resolves the contradiction by improving ease of operation while maintaining structural functionality.
Solution Approach 2:
The patent introduces a linkage device as an intermediary mechanism between the user's hand and the backrest adjustment system. The linkage device includes connecting rods, gripping parts, and positioning parts that work together to transmit and coordinate the adjustment force to both sides of the backrest simultaneously. This intermediary mechanism enables single-handed operation while maintaining the necessary structural complexity for proper adjustment.
2Ease of operation
If a connecting rod is used to pull connecting lines connected to backrest adjustors at two sides for adjustment, then one hand operation is enabled, but the structure becomes complicated increasing device complexity
Solution Approach 1:
The patent segments the adjustment mechanism into distinct functional components: linkage devices on each side, connecting rods, gripping parts, and positioning parts. Each component has a specific function, and they work together in a coordinated manner. This segmentation allows for one-handed operation through the connecting rod mechanism while organizing the structure in a way that manages complexity through functional decomposition.
Solution Approach 2:
The patent employs dynamic elements in the adjustment mechanism, including movable gripping parts, rotating positioning parts with tooth grooves, and flexible connecting lines. These dynamic components allow the mechanism to adapt during operation, enabling one-handed control while the structure naturally manages complexity through its dynamic, rather than rigid, design.
3Adaptability or versatility
If separate adjustment mechanisms are provided at two sides of the stroller, then each side can be adjusted independently, but the overall structure becomes complex and increases manufacturing costs
Solution Approach 1:
The patent makes the linkage device universal by designing identical linkage devices for both sides of the stroller. Each linkage device includes a gripping part, connecting rod, and positioning part that can independently adjust one side while being part of a coordinated system. This universality allows independent adjustment capability on each side while using the same standardized components, thereby managing structural complexity through repetition of proven designs.
Solution Approach 2:
The patent employs homogeneous components on both sides of the stroller - identical linkage devices, connecting rods, and positioning parts with the same tooth groove configurations. This homogeneity allows for simplified manufacturing and assembly while maintaining the adaptability to adjust both sides independently or simultaneously. The repeated use of the same components reduces overall structural complexity compared to using different mechanisms for each side.
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
Enables easy one-handed adjustment of the backrest angle, simplifying the stroller's structure and reducing manufacturing costs while improving user convenience.
Implementation Method 1
the positioning part 26 is used for engaging with the tooth groove 24 so as to fix the inclined angle of the backrest 14 relative to the main frame 12. The spring 22 is connected to the main frame 12 and the backrest adjustor 20... At this moment, the tooth groove 24 is engaged with the positioning part 26 again by elastic force provided from the spring 22
Implementation Method 2
a linkage device disposed on the backrest comprising a handle; a pushing structure sheathing the supporting rod structure in a sliding manner and having a protruding portion, the protruding portion abutting against the backrest adjustor; and a connecting component disposed between the handle and the pushing structure for driving the pushing structure to move upward along the supporting rod structure when the handle of the linkage device is moved upward
Implementation Method 3
the protruding portion of the pushing structure drives the backrest adjustor to rotate relative to the supporting frame of the main frame so as to release the positioning part from the guide rail
Data Source
AI summary
A stroller includes a main frame, a backrest, a backrest adjustor, and a linkage device. There is a guide rail formed inside the backrest adjustor. A positioning part of the backrest engages with the guide rail. When a handle of the linkage device is moved upward, a connecting component of the linkage device drives a pushing component of the linkage device to move upward along a supporting rod of the backrest. Accordingly, a protruding portion of the pushing component drives the backrest adjustor to rotate relative to a supporting frame of the main frame so as to release the positioning part from the guide rail.