Adjustable Headrest Harness Routing for Child Safety Seats
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Solution Overview
Problem
Existing child safety seats with height adjustable harness systems are difficult to adjust, often requiring uninstallation and reinstallation of the harness, and can be complicated by hidden components and small slots, making it hard for users to accommodate children of different heights and complicating manufacturing and cleaning processes.
Innovation Solution
A child safety seat design featuring a height adjustable headrest that repositions the shoulder straps by altering their usable length, with a strap router directing the straps under the headrest and using a contoured strap guide region to simplify adjustment and disengagement, allowing for easy reconfiguration between harness and booster modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slots in the seat back are used for harness height adjustment, then harness height can be adjusted, but the adjustment process becomes complex requiring uninstallation and reinstallation of the harness
Solution Approach 1:
The patent extracts the adjustment mechanism from the seat back structure and relocates it to the harness control panel. The control panel with slots is removed from the seat back and repositioned to be accessible from the front, allowing users to adjust harness height without uninstalling the harness from the seat.
Solution Approach 2:
The patent introduces a control panel as an intermediary component between the user and the harness adjustment mechanism. This control panel contains the slots for strap routing and can be independently accessed and manipulated without requiring disassembly of the entire harness system or seat back.
2Adaptability or versatility
If the control panel is coupled to the seat back for harness adjustment, then harness height can be repositioned, but the control panel becomes difficult to access and manipulate
Solution Approach 1:
The control panel is extracted from its traditional coupled position on the seat back and repositioned to hang freely or be mounted on the front of the seat, making it easily accessible to users without requiring them to reach behind or manipulate hidden components.
Solution Approach 2:
Instead of coupling the control panel to the seat back as traditionally done, the patent inverts the arrangement by positioning the control panel on the front of the seat or allowing it to hang independently, reversing the traditional mounting approach to improve accessibility.
3Adaptability or versatility
If traditional harness adjustment mechanisms are used, then harness height can be adjusted, but the design complexity and manufacturing cost increase
Solution Approach 1:
The control panel serves multiple functions: it provides the adjustment slots for harness height, acts as a structural component of the harness system, and functions as an accessible interface for users. This multi-functionality reduces the need for separate adjustment mechanisms and simplifies the overall design.
Solution Approach 2:
The harness system is segmented into independent functional components: the control panel with slots, the harness straps, and the seat back. This segmentation allows each component to be optimized independently and simplifies manufacturing and assembly processes.
Data Source
AI summary
A child safety seat has a seat back (16) with an upper end (28), a lower end, a back side, and a front side (26). A harness (50) has a pair of shoulder straps (58) each having a portion positioned forward of and extending along the front side. A headrest (32) is coupled to the seat back near the upper end and has a bottom (40). The vertical position of the headrest is selectively adjustable along the seat back between a raised and a lowered position. A strap router (112) on the seat back directs the shoulder straps from the back side toward the front side. The shoulder straps are directed under the bottom (40) of the headrest. By selectively adjusting the headrest vertical position, the bottom (40) of the headrest adjusts the vertical position of the shoulder straps on the front side of the seat back by increasing or decreasing the useable length.