Child Restraint Web Insert for Shoulder Strap Arm Removal
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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 concentrating restraining force on the midriff, and existing solutions are uncomfortable, inconvenient, or not compatible with most child seats.
Innovation Solution
A breathable, adjustable web that extends from the scapula to the lower abdomen, attached to the shoulder straps and car seat, limits arm movement by reducing the gap between the strap and seat, preventing arm removal and distributing impact force across the child's body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shoulder strap is designed to be adjustable and removable for cleaning/replacement, then the ease of operation and maintenance is improved, but the child can easily manipulate their arms through the underside of the strap, converting the harness into a dangerous lap harness
Solution Approach 1:
A webbing insert is introduced as an intermediary component between the shoulder strap and the child's body. This insert extends from the scapula to the lower abdomen, creating a physical barrier that prevents the child from manipulating their arms through the strap while still allowing the strap itself to remain adjustable and removable for maintenance.
Solution Approach 2:
The solution adds a dimensional element by extending the webbing insert vertically along the side of the child's body, from the scapula down to the lower abdomen. This vertical extension creates a three-dimensional restraining structure that blocks the horizontal manipulation path through the strap without interfering with the strap's adjustability.
2Reliability
If a vest is used to attach the harness to prevent arm removal, then the reliability of restraint is improved, but the device complexity and inconvenience of use increases due to requiring an extra layer of clothing
Solution Approach 1:
The functional elements of the vest (webbing material, attachment points, and restraining structure) are extracted and integrated directly into the shoulder strap assembly. This eliminates the need for a separate vest component, reducing device complexity while maintaining the reliability of preventing arm removal through the integrated webbing insert.
3Reliability
If the web extends from scapula to lower abdomen to prevent arm removal, then the reliability of restraint is improved, but the area of material required increases
Solution Approach 1:
The webbing insert is designed with varying width along its length, with greater width at the top near the scapula where arm manipulation is most likely to occur, and gradually narrowing toward the lower abdomen. This local variation in quality optimizes the restraining effect where it is most needed while minimizing the total material area required.
Data Source
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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).