Stroller Dual Spring Rear Suspension for Load Adaptation
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Solution Overview
Problem
Strollers lack an effective suspension system that can provide a smooth ride across varying terrains and handle different loads and user speeds, failing to maintain comfort and support simultaneously.
Innovation Solution
A dual spring rear suspension mechanism with an outer spring for cushioning and an inner spring for rigid support, preventing extreme compression and ensuring a comfortable ride while accommodating heavy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring suspension system is used, then the device complexity is reduced, but the ability to provide both soft cushioning and rigid support under varying loads deteriorates
Solution Approach 1:
The suspension system is divided into two separate spring elements: an outer spring and an inner spring. Each spring is designed with different characteristics - the outer spring provides softer cushioning for normal conditions, while the inner spring provides rigid support for heavy loads. This segmentation allows the system to handle varying load conditions effectively without requiring a single complex adjustable mechanism.
Solution Approach 2:
The inner spring is nested within the outer spring, creating a compact dual-spring arrangement. The inner spring is positioned coaxially inside the outer spring's housing structure, allowing both springs to work simultaneously or sequentially depending on the load. This nesting arrangement maintains adaptability while minimizing space requirements and structural complexity.
2Ease of operation
If a softer spring is used, then the comfort for passengers and users is improved, but the ability to carry heavy loads and prevent extreme compression deteriorates
Solution Approach 1:
The suspension system segments the cushioning and support functions into two separate springs. The outer spring is designed with softer characteristics to provide comfort during normal operation, while the inner spring is designed with stiffer characteristics to provide rigid support when heavy loads are applied, preventing the suspension from reaching extreme compression limits.
Solution Approach 2:
The system changes the effective spring stiffness parameter based on the applied load. Under normal conditions, the softer outer spring dominates, providing comfort. When heavy loads are applied, the inner spring engages to increase the overall stiffness, preventing extreme compression. This parameter change is achieved through the mechanical interaction of the two springs rather than active control.
3Strength
If a rigid spring is used, then the support for heavy loads is improved, but the comfort cushioning under normal conditions deteriorates
Solution Approach 1:
The suspension system segments the support and cushioning functions into two separate springs with different characteristics. The inner spring provides rigid support for heavy loads, while the outer spring provides softer cushioning for normal conditions. This segmentation allows the system to optimize for both strength and comfort simultaneously by having each spring specialize in its intended function.
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
The dual spring system provides a softer ride under normal conditions and additional support during heavy loads, enhancing comfort and stability across diverse terrains and user speeds.
Implementation Method 1
The first spring may be contained within the housing structure... The second spring encircles the housing structure... configured to dampen motion between the second member and the frame of the stroller
Data Source
AI summary
A stroller system including a rear suspension system comprising two springs is discussed. The stroller system is configured to withstand a variety of operating conditions including various terrain, speed and weight requirements. An embodiment of a stroller with a dual elastic suspension system is also discussed.