Compact Foldable Stroller Cam-Driven Frame Assembly
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Solution Overview
Problem
Existing collapsible juvenile strollers lack an efficient mechanism for compact storage, requiring significant space and complicating storage in vehicles or other areas.
Innovation Solution
A cam-driven foldable frame assembly with a mobile base and a juvenile seat, featuring a cart with rear wheels and a cam-fold unit that allows the stroller to transition seamlessly between an expanded use mode and a compact collapsed storage mode through caregiver-controlled movement of a push handle, utilizing a motion-transfer pin and slots to pivot the rolling cart stabilizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the stroller uses a traditional collapsible frame mechanism, then the stroller can be folded, but it requires significant storage space and is difficult to store in vehicles
Solution Approach 1:
The frame is divided into multiple segments that can collapse independently. The cam-fold unit divides the folding action into controlled stages, allowing the frame to collapse into a compact configuration that fits in vehicle storage areas while maintaining ease of operation through the segmented collapse sequence
Solution Approach 2:
The cam-fold unit acts as an intermediary mechanism between the simple push-handle input and the complex frame collapse action. It translates the caregiver's simple pushing motion into a coordinated multi-stage collapse sequence, achieving compact storage without requiring complex manual folding operations
2Volume of moving object
If the stroller frame is made compact for storage, then storage space is reduced, but the mechanism becomes more complex
Solution Approach 1:
The cam-fold unit is designed to be self-actuating through the caregiver's natural pushing motion. The cam mechanism automatically coordinates the collapse of multiple frame segments without requiring complex controls or multiple操作步骤, achieving compact storage while keeping the user interface simple
Solution Approach 2:
The cam-fold unit changes the geometric parameters of the frame segments during collapse. By using cam surfaces with specific radii of curvature, the mechanism transforms the frame configuration smoothly from expanded to compact state, reducing storage volume while controlling the complexity of the transformation through geometric design
3Device complexity
If the stroller uses a simple folding mechanism, then the device complexity is reduced, but it cannot achieve compact storage configuration
Solution Approach 1:
The frame segments are designed to nest within each other during collapse, similar to nested dolls. The cam-fold unit coordinates this nesting by controlling the sequence and timing of segment collapse, achieving compact storage configuration while maintaining relatively simple individual mechanism components
Solution Approach 2:
The cam-fold unit introduces a temporal dimension to the spatial collapse process. By coordinating the collapse of multiple segments in a specific sequence over time, it achieves compact three-dimensional storage configuration using a mechanism that is simple in any single instantaneous state
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 a compact and efficient storage solution by allowing caregivers to easily convert the stroller from an expanded use mode to a compact collapsed mode and vice versa, optimizing storage space without the need for complex mechanisms.
Implementation Method 1
an inverse cam including a follower and a motion-transfer pin
Implementation Method 2
a curved motion-transfer slot formed in the follower, and a curved motion-inducement slot formed in the pin mover
Implementation Method 3
The motion-transfer pin is arranged to extend into and move back and forth simultaneously in a straight pin-receiver slot formed in the cam-support base, a curved motion-transfer slot formed in the follower, and a curved motion-inducement slot formed in the pin mover
Implementation Method 4
cause the follower and the rolling cart stabilizer coupled to the follower to pivot about the pivot axis
Data Source
AI summary
A juvenile stroller includes a mobile base and a juvenile seat mounted on the mobile base. The mobile base includes wheels and a foldable frame carrying the juvenile seat.