Tandem Stroller Collapsible Frame with Sliding Bracket
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Solution Overview
Problem
Conventional tandem jogging strollers are difficult to fold and reduce in size for storage and delivery due to their larger frame structure and components, which compromises stability and safety.
Innovation Solution
A tandem jogging stroller design featuring a handlebar, rear and front frame bars, a movable bracket, and a handlebar control mechanism that allows the stroller to be collapsed by moving the movable bracket and front bottom frame bars backwards along the rear bottom frame bars, reducing the overall size, while the movable bracket also serves as a footplate for the child.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame structure, wheels and other related parts are made relatively greater for stability and safety, then the stability and safety are improved, but the size for storage and delivery increases
Solution Approach 1:
The patent implements a movable bracket that can slide along the frame between an extended position (for stability during use) and a retracted position (for compact storage). This dynamic adjustment allows the stroller to maintain large dimensions when needed for safety and stability, while reducing to a compact size for storage and delivery.
Solution Approach 2:
The stroller frame is divided into separable components including the movable bracket, handlebar, and wheel assembly that can be independently positioned or removed. This segmentation allows the structure to be collapsed into a compact configuration while maintaining the integrity of each component for stability during operation.
2Ease of operation
If a conventional single-seat jogging stroller is collapsed by turning the handlebar downwardly backwards, then the folding process is simple, but the stroller cannot be sufficiently reduced in size for tandem configuration
Solution Approach 1:
The movable bracket is designed to slide along guide rails on the frame, allowing smooth transition between extended and retracted positions. This dynamic mechanism enables the tandem stroller to collapse to a compact size while maintaining ease of operation through simple sliding motion rather than complex disassembly.
3Volume of moving object
If the movable bracket is added to enable size reduction, then the foldability and storage size are improved, but the device complexity increases
Solution Approach 1:
The movable bracket serves multiple functions: it acts as a structural support element, provides a footrest for the rear child, and enables the collapsing mechanism for compact storage. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving significant size reduction.
Solution Approach 2:
The footrest function is merged with the movable bracket that serves as a structural component of the frame. By combining these functions into a single element, the patent avoids adding separate complexity while achieving both size reduction and child comfort features.
4Adaptability or versatility
If the movable bracket serves as a footplate, then the functionality for child comfort is improved, but the structural complexity increases
Solution Approach 1:
The movable bracket is designed to simultaneously serve as a structural support element of the frame and as a footrest for the child in the rear seat. This multi-functional design provides child comfort functionality without requiring a separate dedicated footrest component, thereby limiting the increase in structural complexity.
Data Source
AI summary
A tandem jogging stroller is disclosed formed of a handlebar, two rear-seat rear frame bars, a rear wheel axle, two rear-seat front frame bars, two rear-seat side frame bars, a movable bracket, two rear bottom frame bars, two front bottom frame bars, two front-seat front frame bars, two front-seat rear frame bars, a front wheel bracket, and a handlebar control mechanism. The two front bottom frame bars are respectively connected to the movable bracket, and the movable bracket is coupled to and movable along the rear bottom frame bars. When collapsing the tandem jogging stroller, the movable bracket and the front bottom frame bars are moved backwards along the rear bottom frame bars to reduce the size for storage.