Child Seat Lap Belt Adjuster With Integrated Locking Structure
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Solution Overview
Problem
Child safety seats often have non-adjustable lap belts, leading to discomfort and safety issues due to excessively short belts when shoulder belts are adjusted, failing to accommodate children of varying sizes effectively.
Innovation Solution
A lap belt length adjusting device with a fixing end and a free end, featuring an adjusting structure and a locking mechanism, allowing the lap belt length to be increased or decreased by passing the free end through an adjusting structure and using a locking structure with a U-shaped fixing case and elastic member to secure the desired length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lap belt length is fixed, then the device complexity is reduced, but the adaptability to different child sizes deteriorates
Solution Approach 1:
The lap belt is divided into multiple sections with different lengths. The adjusting structure allows the belt to be segmented into a use section (between the fixing end and adjusting structure) and a remaining section. By passing the free end through the adjusting structure multiple times, different lengths of the use section can be achieved to accommodate children of different sizes.
Solution Approach 2:
The locking structure is designed to be dynamically adjustable. The locking member can pivot between a locking position (where it presses against the belt to prevent movement) and an unlocking position (where it allows the belt to move). This dynamic mechanism enables easy adjustment while maintaining security at the selected length.
2Adaptability or versatility
If the lap belt is made adjustable, then the adaptability to different child sizes is improved, but the ease of operation deteriorates due to complex adjustment mechanisms
Solution Approach 1:
The locking structure utilizes the tension from the lap belt itself to engage the locking member. When the free end is pulled through the adjusting structure, the belt tension automatically pushes the locking member into the locking position, securing the belt length without requiring additional locking actions from the user. The elastic member provides the necessary force to maintain this self-locking function.
3Reliability
If the locking structure is added to secure the belt length, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The adjusting structure and locking structure are merged into an integrated assembly. The adjusting structure includes the first opening through the seat part, while the locking structure includes the fixing case with U-shaped structure and pivoting locking member. These components work together as a unified system, where the belt passes through both structures in sequence, reducing overall complexity compared to separate adjusting and locking mechanisms.
Solution Approach 2:
The elastic member acts as an intermediary element between the locking member and the belt. It provides the necessary force to push the locking member into the locking position and maintains continuous pressure to ensure reliable locking. This intermediary component simplifies the locking mechanism by eliminating the need for complex springs or actuators.
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 convenient adjustment of the lap belt length to suit different child sizes, ensuring comfort and safety by allowing the lap belt to be easily extended or shortened, preventing continuous adjustment and maintaining the appropriate length.
Implementation Method 1
the locking structure further includes an elastic member that drives the locking member to lock the lap belt
Data Source
AI summary
The present disclosure provides a lap belt length adjusting device for a child safety seat, which includes a fixing end and a free end, the fixing end is fixed to a seat part of the child safety seat, and the free end is pulled by a user, the lap belt length adjusting device includes: an adjusting structure arranged at the seat part and through which the free end passes, wherein after the free end passes through the adjusting structure, a length of a use section of the lap belt between the fixing end and the adjusting structure can be increased or decreased; and a locking structure for locking or unlocking the lap belt between the adjusting structure and the free end, to prevent or allow an increase or decrease in the length of the use section of the lap belt between the fixing end and the adjusting structure.