Ball-and-Socket Joint Module for Mirror Head Torque Stability
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Solution Overview
Problem
Conventional mirror-adjustment mechanisms face limitations in maintaining consistent torque and stability across temperature variations and component wear, particularly in designs that inhibit free rotation and are not adaptable for unimpeded movement, leading to inconsistent and variable adjustment performance.
Innovation Solution
A ball-and-socket joint module utilizing a compression spring to maintain consistent torque and stiffness, allowing for unimpeded rotation and adjustment of a mirror head, without axial members like bolts or rods, ensuring consistent performance across temperature ranges and component wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial members (bolts, studs, posts) are used to maintain spring tension in ball-and-socket joints, then the joint can be fastened and compressed, but the torque consistency and stability deteriorate across temperature variations and component wear
Solution Approach 1:
The patent removes axial members (bolts, studs, posts) from the ball-and-socket joint structure, extracting the problematic component that caused torque inconsistency. The spring tension is maintained through the ball-and-socket joint design itself, eliminating the need for separate axial fastening members and thereby improving torque consistency while reducing structural complexity.
Solution Approach 2:
Instead of using axial members to compress the spring toward the bearing surface, the patent inverts the approach by allowing the ball-and-socket joint geometry and spring placement to naturally maintain tension without external axial fasteners. This inversion eliminates the source of torque variation while maintaining the necessary spring compression.
2Adaptability or versatility
If trunnions and guide channels are added to inhibit free rotation, then stability upon adjustment is improved, but the rotation freedom and adaptability deteriorate
Solution Approach 1:
The ball-and-socket joint design serves itself to maintain stability through its inherent geometry and the spring tension system, without requiring additional trunnions or guide channels to constrain rotation. The joint achieves both rotation freedom and adjustment stability through its self-contained design, eliminating the need for extra stabilizing components.
3Reliability
If conventional spring-bolt combinations are used to maintain tension, then the mirror adjustment position can be retained, but the torque varies due to material creep and component wear
Solution Approach 1:
The patent extracts the bolt or stud from the spring-tensioning mechanism, removing the component subject to creep and wear. The spring is retained and integrated directly into the ball-and-socket joint structure, maintaining tension through the joint geometry itself rather than through a separate axial fastener, thereby improving long-term adjustment consistency.
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
The solution provides a mirror assembly with consistent and repeatable torque and adjustment performance across wide temperature ranges and throughout the useful life of components, enhancing stability and reducing variability due to temperature changes and material creep.
Implementation Method 1
A ball-and-socket joint module utilizing a compression spring to maintain consistent torque and stiffness
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A ball-and-socket joint module (26) affixed to a mirror head (14) provides for adjusting a position of a mirror (16). The module includes a multicomponent ball assembly (86) that has an internally mounted spring (82). The spring presses two components (34, 72) of the ball assembly away from each other so that opposing surfaces (32, 70) of the ball assembly confront corresponding surfaces (62, 64) of a multicomponent socket assembly (90) when the ball assembly is nested within the socket assembly.