Child Seat Shoulder Strap Rail Mechanism for Synchronized Width Adjustment

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Solution Overview

Problem

Existing child safety seats lack the ability to adjust shoulder strap width synchronously with the height of the headrest, failing to accommodate children of different heights and body types effectively.

Innovation Solution

A shoulder strap width adjustment mechanism comprising a rail device with two rails on the seat backrest and shoulder strap fixing members that slide along these rails, allowing the lateral distance between shoulder strap holes to change as the headrest adjusts longitudinally, ensuring simultaneous adjustment of shoulder strap width with headrest height.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed shoulder strap width is used, then the structure is simple, but it cannot accommodate children of different body types

Engineering Contradiction:

Improveadjustment mechanism complexityVSAvoidshoulder strap width adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent segments the adjustment mechanism into modular components: the rail device with first and second asymmetric rails, the sliding fixing members, and the connection to the shoulder strap assembly. This segmentation allows for a relatively simple individual component design while achieving complex adjustment functionality through their coordinated interaction, reducing the overall complexity burden

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rail device serves multiple functions: it guides the vertical movement of the headrest, controls the horizontal movement of the shoulder straps, and provides the asymmetric geometry needed for width adjustment. This multi-functionality reduces the need for separate adjustment mechanisms, maintaining structural simplicity while achieving adaptability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12559001B2Shoulder strap width adjustment mechanism and child safety seat

Publication Date: 2026.02.24 BAMBINO PREZIOSO SWITZERLAND AG

AI summary

The disclosure provides a shoulder strap width adjustment mechanism (40) comprising: a rail device (44), arranged on a seat backrest (22), including a first rail (441) and a second rail (442) arranged on both sides of the seat backrest (22) and extending substantially in a longitudinal direction, and a lateral distance between the first rail (441) and the second rail (442) gradually changes in the longitudinal direction; and two shoulder strap fixing members (42), connected to a seat headrest (30) and positioned between the seat headrest (30) and the seat backrest (22), and being slidable respectively along the first rail (441) and the second rail (442) of the rail device (44). In the disclosure, the shoulder strap width can be adjusted synchronously during the process of adjusting the height of the headrest, so as to meet the requirements of children of different heights and different body types.