Child seat device and child product
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Solution Overview
Problem
Existing child seat devices become too tight when adjusting from sitting to lying posture due to increased strap length, requiring frequent adjustments of the crotch or shoulder strap length, leading to inconvenience.
Innovation Solution
A child seat device with a tether system featuring a crotch strap and shoulder strap, where the crotch strap slides and adjusts length inversely with the backrest angle, and an adjustment strap mechanism to automatically compensate for the total length of the safety belt, ensuring comfortable binding in both postures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backrest angle is adjusted from sitting posture to lying posture, then the child's comfort is improved, but the seat belt becomes taut and binds the child tightly
Solution Approach 1:
The crotch strap is designed with dynamic length adjustment capability through a reel mechanism that automatically changes the strap length based on the backrest angle. When the backrest transitions from sitting to lying posture, the reel mechanism releases additional strap length to maintain appropriate tightness, transforming the static strap into a dynamic system that adapts to posture changes
Solution Approach 2:
The system changes the parameter of strap length in response to backrest angle changes. The reel mechanism is configured to automatically adjust the crotch strap length according to the backrest position, ensuring the strap maintains optimal tension regardless of whether the child is in sitting or lying posture
2Object-affected harmful factors
If the crotch strap length is manually adjusted to solve tightness, then the seat belt tightness is improved, but the device complexity and user convenience deteriorate
Solution Approach 1:
The reel mechanism is designed to automatically adjust the crotch strap length based on the backrest angle without requiring user intervention. The system uses the mechanical movement of the backrest itself to drive the reel mechanism, which in turn automatically releases or winds the strap to maintain proper tension, making the adjustment process self-service
3Device complexity
If the crotch strap length is fixed, then the device complexity is reduced, but the adaptability to different postures deteriorates
Solution Approach 1:
The crotch strap system transitions from a fixed-length design to a dynamic adjustable design using a reel mechanism. This mechanism allows the strap length to change automatically with backrest angle, providing adaptability to different postures while maintaining a relatively simple overall structure through the use of a single movable component
Data Source
AI summary
A child seat device and a child product having the same. The child seat device comprises a backrest (1), a seat (2) and a tether system (3). The backrest (1) is rotatably connected to the seat (2). The seat device has a sitting side and a back side. The tether system (3) comprises a shoulder strap (31) and a crotch strap (32). The shoulder strap (31) is arranged on the backrest (1). The crotch strap (32) has a connecting end (321) and a fixed end (322). The portion of the crotch strap (32) on the sitting side is a first strap segment (32a). The connecting end (321) is located on the first strap segment (32a) and can be detachably connected to one end of the shoulder strap (31). The fixed end (322) is fixedly connected to the back side of the seat device. The tether system (3) can be adjusted with the rotation of the backrest (1) and automatically compensate for the total length of a safety belt on the front side of a child body when the backrest (1) angle is increased, such that the child is not bound too tightly. The tether system (3) automatically reduces the total length of the safety belt on the front side of the child body when the backrest (1) angle is decreased so as to ensure that the child is bound firmly.