Child Seat Harness Locking Mechanism for Tool-Free Removal
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Solution Overview
Problem
Conventional child vehicle seats do not allow for easy and quick removal and replacement of harness systems without specialized tools, leading to worn or dirty belts being difficult to replace.
Innovation Solution
A child restraint seat with a harness locking mechanism that includes a flexible retention tab and a locking pin, allowing the mechanism to switch between locked and unlocked states for easy removal and installation of the harness, using a longitudinal groove and anchor member for axial sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional harness systems are used in child seats, then the harness provides reliable restraint, but the harness cannot be removed or replaced without specialized tools or destruction of the seat
Solution Approach 1:
The harness system is segmented into separable components: the harness itself and the locking mechanism. The locking mechanism is further segmented into a locking pin, retention tab, and groove system. This segmentation allows the harness to be independently removed and replaced without affecting the seat structure, resolving the contradiction between ease of operation and device complexity by making the system modular and tool-free for user assembly/disassembly.
Solution Approach 2:
The locking mechanism is extracted as a separate, integrated component system that can be operated by the user without external tools. The retention tab is designed to be deflected by hand to release the locking pin, allowing the harness to be removed without specialized tools or seat destruction, thus improving ease of operation while maintaining sufficient structural integrity.
2Ease of operation
If the harness locking mechanism uses a simple deflection-based release, then tool-free removal is enabled, but the locking mechanism must be located at the rear surface of the seat shell
Solution Approach 1:
The locking mechanism components (locking pin, retention tab, groove) are merged into an integrated system that combines the locking function with the seat shell structure. The retention tab is formed as part of the seat shell rear surface, and the longitudinal groove is molded into the shell, creating a unified structure that enables tool-free operation without requiring separate complex assemblies or modifying the overall seat design.
3Ease of operation
If the retention tab is made flexible to enable deflection, then easy unlocking is achieved, but the tab must be made of plastic rather than metal
Solution Approach 1:
The retention tab is designed with localized flexibility at specific points to enable deflection for unlocking, while maintaining sufficient overall strength through its plastic construction and integration with the seat shell. The plastic material provides the necessary combination of flexibility for user-deflectable operation and strength to maintain the locked position during normal use, resolving the contradiction between operational ease and structural strength.
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 quick and tool-free removal and replacement of the harness system, improving maintenance and hygiene by allowing easy access to the harness without damaging the seat.
Implementation Method 1
a flexible retention tab located in the rear surface of the seat shell and forming a border of the longitudinal groove; and a harness locking mechanism configurable between (a) a locked state in which the harness locking mechanism abuts the retention tab, and (b) an unlocked state in which, upon deflection of the retention tab away from the longitudinal groove, the harness locking mechanism slides axially along the longitudinal groove past the retention tab
Data Source
AI summary
A harness locking mechanism for use with a child restraint seat is configurable between a locked state in which a harness cannot be removed from the seat and an unlocked seat in which the harness can be removed from the seat for cleaning or replacement.