Vehicular Headrest Cable Fixing Without a Bracket
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Solution Overview
Problem
Existing vehicular headrests require a large bracket to fix the end portion of the outer cable, which limits flexibility in attachment location and increases complexity, while also compromising stability and operability.
Innovation Solution
A headrest design that uses a cap attached to the end portion of the outer cable, which is fixed to the stay via a snap ring or metal plate locking mechanism, eliminating the need for a bracket and enhancing stability and operability by allowing the inner cable to penetrate the stay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large bracket is used to fix the end portion of the outer cable, then the attachment location has predetermined rigidity, but the device complexity increases and the attachment location is limited to inside of the headrest main body or seat back
Solution Approach 1:
The invention extracts and eliminates the bracket component from the cable fixation system. Instead of using a separate bracket to fix the outer cable end portion, the cable end is directly fixed to the stay, simplifying the overall structure while maintaining the necessary stability through the stay's inherent rigidity
Solution Approach 2:
The stay serves multiple functions: it provides structural support for the headrest and simultaneously serves as the fixation point for the outer cable end. This multi-functionality eliminates the need for a separate bracket, reducing device complexity while maintaining attachment stability
2Stability of the object's composition
If the bracket is used to fix the outer cable end portion, then the attachment location is constrained to areas with predetermined rigidity, but the ease of manufacture decreases
Solution Approach 1:
By removing the bracket component, the invention simplifies the manufacturing process. The outer cable end can now be directly attached to the stay without requiring separate bracket assembly steps, making the manufacturing process more straightforward and easier to execute
Solution Approach 2:
The invention merges the cable fixation function with the stay structure itself. The outer cable end is directly fixed to the stay, combining what were previously separate components (bracket and stay) into a single integrated solution, thereby simplifying assembly
3Device complexity
If the inner cable is inserted into the outer cable without penetrating the stay, then the structure is simpler, but the operability and pulling behavior stability deteriorate
Solution Approach 1:
The inner cable is configured to penetrate the stay before the headrest operation begins. This preliminary positioning ensures that when the headrest is operated, the inner cable can effectively transmit pulling forces through the stay, stabilizing the pulling behavior and improving operability from the outset
Solution Approach 2:
The stay serves as an intermediary element through which the inner cable penetrates. This intermediary structure provides a stable pathway for the inner cable, ensuring that the pulling action is effectively transmitted while maintaining structural integrity and operational stability
Data Source
AI summary
A headrest for a vehicular seat has a base member, a headrest main body and a cable. The base member has a stay held by a side of a seat back. The headrest main body is movably attached to the base member. The cable is pulled when the headrest main body is moved relative to the base member. The cable includes an outer cable and an inner cable inserted to the outer cable. The outer cable is attached with a cap at an end portion thereof. A fixing structure for fixing the cap to an end portion of the stay is provided between the cap and the end portion of the stay. And the inner cable penetrates a shaft hole of the stay by exceeding the outer cable and is moved relative to the outer cable and the stay by being pulled when the headrest main body is moved.