Stroller Accommodation Device with Rotatable Cavity and Strap
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Solution Overview
Problem
Existing baby strollers face challenges in converting between lying and sitting states due to issues such as excessive tilt, discomfort, complicated operations, and difficulty in adjusting the backrest, often resulting in semi-lying or half-lying positions rather than fully sitting or lying states.
Innovation Solution
A stroller accommodation device with a rotatable accommodating cavity and a flexible circumferential surrounding portion, along with a movable bearing portion and adjustable strap system, allows for easy conversion between lying and sitting states without auxiliary structures, ensuring a compact and simple design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flexible fabric backrest is used without additional support structures, then the structure is simple and cost-effective, but the backrest tilts excessively and becomes unstable when the infant or child is seated
Solution Approach 1:
The backrest is divided into multiple segments: a rigid supporting member for structural stability, a flexible fabric portion for comfort and flexibility, and an adjusting strap for position control. This segmentation allows each component to perform its specific function optimally while working together to achieve both simplicity and stability.
Solution Approach 2:
An adjusting strap is introduced as an intermediary element between the rigid supporting member and the flexible fabric backrest. This strap mediates the connection, allowing the backrest to maintain stability while preserving the simplicity of the overall structure without requiring complex mechanical mechanisms.
2Reliability
If additional straps are added to secure the backrest in a sitting state, then the backrest stability is improved, but the operation becomes complicated requiring manual tightening and untieing
Solution Approach 1:
The adjusting strap is designed to be dynamically adjustable rather than fixed. It can be easily tightened or loosened by the user during operation, and automatically maintains the backrest in the desired position. This dynamic design simplifies operation compared to static strap systems that require manual tightening and untieing for each position change.
3Strength
If a rigid supporting member is used to hold the backrest at a smaller angle, then the backrest can support the infant or child's weight, but a very large force is required to convert between states
Solution Approach 1:
The system utilizes parameter changes in the adjusting strap's tension and the bearing portion's angular position to enable easy conversion between states. By changing the tension parameter of the adjusting strap and the angular parameter of the bearing portion, the system allows smooth transitions between lying and sitting positions without requiring very large forces, while still maintaining sufficient weight bearing capacity through the rigid supporting member.
Data Source
AI summary
An accommodation device includes a seat assembly, at least one flexible adjustment strap and an accommodating cavity having a bearing portion and a flexible circumferential surrounding portion. The accommodating cavity is rotatable between a lying state and a sitting state. When in the sitting state, a side of the circumferential surrounding portion reaching a topmost point is a first side portion, and a side opposite to the first side portion is a second side portion. The bearing portion has at least two foldable portions forming a first portion close to the first side portion and a second portion far from the first side portion. The adjusting strap is tensioned by the seat assembly and the first side portion when in the sitting state. The second portion is moved to form a seat portion during rotation to the sitting state, and the first portion is supported by the adjusting strap to form a backrest portion.