Child Harness Restraining Web to Prevent Shoulder Strap Escape
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Solution Overview
Problem
Children can easily manipulate their arms through the underside of the shoulder strap in child safety seats, converting the harness into a potentially dangerous lap harness by removing their shoulders from the strap, which existing solutions like vests are uncomfortable, difficult to use, and not compatible with most child seats.
Innovation Solution
A restraining web that can be integrated into or retrofitted onto child car seats, covering the area below the armpit and abdomen, limiting arm removal by adjusting the gap between the shoulder strap and seat, and attaching to the harness or seat via hook and loop fasteners, ensuring the web is breathable and adjustable for comfort and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional shoulder strap harness is used, then the child seat is simple and comfortable, but the child can easily manipulate their arms through the underside of the shoulder strap, converting the harness into a potentially dangerous lap harness
Solution Approach 1:
The restraining web is divided into multiple functional zones: a first web portion covering the area below the armpit/scapula and a second web portion covering the side of the abdomen. This segmentation allows each portion to perform its specific restraining function while maintaining overall system simplicity
Solution Approach 2:
The restraining web acts as an intermediary element between the shoulder strap and the child's body, preventing direct arm manipulation through the strap while distributing restraining forces across multiple body areas (shoulder, armpit, abdomen), thereby enhancing safety without requiring fundamental changes to the harness structure
2Reliability
If a vest is used to prevent arm removal from the shoulder strap, then the harness safety is improved, but the child experiences discomfort due to an extra layer of clothing and the vest must be carried with the seat
Solution Approach 1:
The restraining web is merged with the existing harness system, either as an integrated component or as a retrofit attachment. This eliminates the need for a separate vest, reducing the number of items to carry and manage while maintaining the safety function
Solution Approach 2:
The restraining web serves multiple functions: it prevents arm removal from the shoulder strap, distributes restraining forces across the body, and can be integrated into various child seat designs. This multi-functionality replaces the need for separate protective clothing
3Reliability
If a vest is used to prevent arm removal from the shoulder strap, then the harness safety is improved, but the installation becomes difficult as the vest must be worn by the child and then attached to the seat
Solution Approach 1:
The restraining web is pre-attached to the harness or seat structure during manufacturing, eliminating the need for complex installation steps involving vest donning and attachment. The system is ready for use immediately, simplifying both manufacturing and consumer installation
4Reliability
If a restraining web covering the area below the armpit and abdomen is used, then the child cannot slip arms out of the shoulder harness, but the web must be securely attached to the harness or seat
Solution Approach 1:
Different attachment mechanisms are used at different locations: the first web portion attaches to the shoulder strap near the armpit area, while the second web portion attaches to the seat or harness at the abdomen level. Each attachment point is optimized for its specific location and force requirements
Data Source
AI summary
A child restraining system for a vehicle the system comprising: at least one web (60), suitable for attachment to a harness comprising a shoulder strap (14); wherein in use the one or more webs (60) covers an area substantially below the scapula and the same or a different web covers at least part of the side of the abdomen; thereby limiting the ability of a child to slide an arm or a shoulder out from under the strap (14).