Car Seat Belt Retractor Locking for Automatic Child Fit Adjustment
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Solution Overview
Problem
Conventional car seat belts are cumbersome to adjust manually, failing to meet the needs of convenience and safety for children of different ages and body shapes.
Innovation Solution
An automatic belt adjustment apparatus featuring a fixing buckle, belt buckle, belt retractor, and position switching member that allows for automatic adjustment of the belt length by selectively limiting the belt retractor's retraction, using a locking assembly that switches between positions to facilitate either manual or automatic belt operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual belt adjustment is used, then device complexity is reduced, but ease of operation deteriorates due to cumbersome adjustment process
Solution Approach 1:
The belt retractor automatically adjusts the belt length by retracting the belt when the locking assembly is in the released state, eliminating the need for manual adjustment operations. The system serves itself by using the belt retraction force to automatically wind and store excess belt material.
Solution Approach 2:
The locking assembly is designed to switch between locked and released states dynamically, allowing the belt retractor to transition between restrained and unrestrained conditions. This dynamic switching enables automatic belt adjustment while maintaining safety when needed.
2Productivity
If automatic belt retraction is enabled, then productivity is improved through automated adjustment, but reliability deteriorates due to potential unintended retraction
Solution Approach 1:
The position switching member provides feedback control by detecting the buckle state and automatically switching the locking assembly between locked and released states. When the buckle is engaged, the locking assembly is locked to prevent retraction; when unbuckled, it is released to enable retraction, ensuring reliable automatic operation.
Solution Approach 2:
The position switching member acts as an intermediary between the buckle state and the locking assembly, translating buckle engagement status into appropriate locking states. This intermediary mechanism ensures that automatic retraction only occurs when appropriate, improving reliability.
3Reliability
If locking assembly is always engaged, then safety is improved by preventing unintended retraction, but ease of operation deteriorates due to inability to adjust belt length
Solution Approach 1:
The locking assembly transitions dynamically between locked and released states based on buckle engagement, allowing the system to switch between safety mode (locked) and adjustment mode (released) automatically, resolving the contradiction between safety and operability.
Data Source
AI summary
An automatic belt adjustment apparatus includes a fixing buckle, a belt buckle, a belt retractor, and a position switching member. The belt buckle is configured to be buckled with the fixing buckle. The belt retractor is connected to the other end of the belt. The belt retractor includes a locking assembly configured to selectively limit the belt retractor from automatically retracting the belt. The position switching member is movably disposed on at least one of the fixing buckle and the base, and configured to selectively drive the locking assembly to switch between a first position and a second position. When the position switching member drives the locking assembly to switch to the second position, the locking assembly is refrained from limiting the belt retractor from automatically retracting the belt.