Vehicle Headrest Bracket Wobble Attachment Assembly
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Solution Overview
Problem
Existing headrest and support rod bracket systems for vehicle seats are difficult to assemble efficiently, lacking in design simplicity and flexibility, which complicates the assembly process and increases production costs.
Innovation Solution
A support rod bracket system featuring a traverse connected to two support rods via wobble attachments, allowing for easy assembly through tumble riveting or similar methods, and a headrest design with a movable head box guided by a support rod bracket, incorporating a locking device and actuator for adjustable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional attachment methods (riveted or welded connections) are used to connect the traverse to the support rods, then the connection strength is improved, but the assembly complexity and production cost increase
Solution Approach 1:
The patent changes the attachment method from traditional riveted or welded connections to a wobble attachment method, where the attachment geometry and forming process parameters are optimized to achieve strong connections through controlled deformation and material flow, simplifying the assembly process while maintaining connection strength
2Reliability
If traditional attachment methods are used, then connection reliability is improved, but the manufacturing time and production efficiency decrease
Solution Approach 1:
The traverse end portion is designed with pre-formed geometric features (such as specific cross-sectional shapes or embedded elements) that enable the wobble attachment process to create reliable connections through controlled deformation, reducing the need for complex multi-step assembly operations and improving production efficiency while maintaining connection reliability
3Adaptability or versatility
If the head box is made movable relative to the support rod bracket, then the adjustability and versatility are improved, but the structural complexity increases
Solution Approach 1:
The headrest system is segmented into movable head box and stationary support rod bracket components, with the traverse providing the connection interface. This segmentation allows the head box to move independently between upper and lower positions while the support rod bracket remains fixed, achieving adjustability without requiring complex integrated mechanisms
4Adaptability or versatility
If a locking device with multiple positions is implemented, then the functionality and user control are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The locking device is designed to automatically lock the head box in place at predetermined positions during movement, utilizing the interaction between the traverse and head box geometry. The system self-locks without requiring additional actuators or complex control mechanisms, achieving multi-position functionality while minimizing added complexity and manufacturing cost
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates simple, flexible, and cost-effective assembly of the headrest with enhanced stability, enabling easy adjustment and locking in multiple positions, thereby improving assembly efficiency and reducing production complexity.
Implementation Method 1
Within the meaning of the invention, wobbling attachment means that the attachment is produced by wobbling deformation of the support rod and/or the traverse. Tumbling, also known as tumble riveting or radial riveting, is a cold forming process. With this method, the forming force only acts on a partial area of the workpiece at a time. A wobbling movement of the tool ensures that further areas of the workpiece are formed.
Implementation Method 2
Due to the wobbling of an end portion of the crosshead, the deformed material flows radially outward toward a center of wobbling, creating a rivet or fastener head.
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
The invention relates, among other things, to a method for mounting a headrest, which is provided with at least two support rods (12a, 12b) for attaching the headrest to the backrest of a vehicle seat, wherein each support rod (12a, 12b) is inserted into a guide (16a, 16b) of the headrest housing (11). The special feature is that a cross member (13) is inserted into the headrest housing (11) such that it extends through at least one elongated hole (19a, 19b, 19c) of the headrest housing (11), wherein the cross member (13) is attached with its end regions (31, 32) to an end region (27) of each support rod (12a, 12b).