Headrest
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Solution Overview
Problem
The existing headrest designs for vehicle seats transmit significant frontal loads to the connecting member, which can lead to deformation and potential contact with the occupant's head, reducing the structural integrity and comfort.
Innovation Solution
The design positions the second horizontal shaft in front of the vertical shafts, using first horizontal shafts to direct the load directly to the pillar member, reducing the load on the connecting member and incorporating a channel-shaped engaging portion with fastening elements to secure the connecting member to the base member, minimizing contact with the occupant's head and enhancing structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second horizontal shaft is positioned in a rear part of the headrest, then the connecting member can be simplified in structure, but the load applied to the connecting member increases significantly causing deformation
Solution Approach 1:
The patent repositions the second horizontal shaft from a rear position to a front position of the headrest, changing the spatial dimension of load transmission. This dimensional change allows the pillar member to directly receive frontal loads through the base member, bypassing the connecting member and preventing its deformation while maintaining structural simplicity
2Strength
If the connecting member is positioned to transmit load directly, then the structural integrity improves, but the risk of contact with the occupant's head increases
Solution Approach 1:
The patent introduces the base member as an intermediary element between the pillar member and the connecting member. The base member receives frontal loads from the pillar member and transmits them to the seat back, preventing the connecting member from directly contacting the occupant's head while maintaining structural integrity
3Strength
If the second horizontal shaft is repositioned to the front, then the load on the connecting member is reduced, but the pillar member structure becomes more complex
Solution Approach 1:
The patent segments the pillar member into distinct functional components: vertical shafts for height adjustment, first horizontal shafts with curved sections for load direction, and a second horizontal shaft for lateral connection. This segmentation allows each component to perform its specific function efficiently while managing overall structural complexity
Data Source
AI summary
The load applied to a connecting member that connects a second horizontal shaft to a base member in a headrest for a vehicle is reduced. The headrest comprises a pillar member including a right and a left vertical shaft extending upward from an upper part of a seat back, a right and a left first horizontal shaft extending forward from upper ends of the respective vertical shafts, each first horizontal shaft including a curved section, and a second horizontal shaft extending laterally between front parts of the first horizontal shafts, a base member including a base vertical portion extending vertically ahead of the vertical shafts, a base upper portion extending rearward from an upper end of the base vertical portion, and a right and a left first hole formed in the base upper portion to have the respective curved sections or the respective vertical shafts passed therethrough, a connecting member pivotably connecting the base upper portion to the second horizontal shaft, and a pad supported by the base member.