Thumbstick Tilt Tension Adjustment via Threaded Post and Base
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Solution Overview
Problem
Existing thumbsticks in user input devices often experience connection degradation over time due to interference fits, leading to reduced user experience, and current tension-adjustment mechanisms can accelerate this degradation, especially with plastic components which are prone to fatigue and breakage.
Innovation Solution
The implementation of a thumbstick design featuring a tiltable post with external threads and a base with internal threads, along with an adjustable tensioning mechanism, provides a secure and durable connection using metallic components, allowing users to adjust tilt tension without tools, enhancing durability and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If interference fits are used to connect thumbstick components, then initial connection strength is achieved, but connection reliability degrades over time due to fatigue and breakage
Solution Approach 1:
The thumbstick assembly is divided into separate threaded components (tiltable post with external threads, base with internal threads) that can be connected and disconnected. This segmentation allows for a more reliable threaded connection compared to a monolithic interference fit, as the threads distribute stress more evenly and allow for adjustment if loosening occurs.
Solution Approach 2:
The connection method is changed from an interference fit (relying on friction and material deformation) to a threaded connection (relying on mechanical interlocking through threads). This parameter change in the connection mechanism provides superior long-term reliability while maintaining initial connection strength.
2Adaptability or versatility
If tension-adjustment mechanisms are added to modify tilt tension, then user experience and adaptability are improved, but device complexity and wear acceleration are increased
Solution Approach 1:
The tension adjustment functionality is merged with the existing threaded connection structure. The same threads that connect the base to the tiltable post also serve as the adjustment mechanism, allowing tension modification without adding separate adjustment components. This reduces overall device complexity while maintaining adaptability.
Solution Approach 2:
The threaded connection serves multiple functions: it provides structural support, enables tension adjustment, and allows for easy assembly and disassembly. This multi-functionality eliminates the need for separate tension adjustment mechanisms, thereby reducing device complexity while improving adaptability.
3Reliability
If metallic components with threads are used instead of plastic interference fits, then durability and connection strength are improved, but manufacturing precision requirements are increased
Solution Approach 1:
The threaded connection allows for dynamic adjustment of the tiltable post position, enabling users to modify tension settings. This dynamic capability not only improves durability through proper load distribution but also accommodates manufacturing tolerances by allowing post-installation adjustment, thereby reducing the stringency of manufacturing precision requirements.
Data Source
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AI summary
A thumbstick for a user input device comprises a tiltable post operable to output a control signal based on its position, with the post comprising external threads and a post anchor feature. An adjustable tensioning mechanism is configured to modify a tilt tension of the post. A cap comprises a cylindrical stem that defines a cavity. A base is moveable with the post and comprises a first cylindrical portion extending into the cavity, and a second cylindrical portion comprising internal threads and a base anchor feature. The internal threads mate with the external threads of the post to fasten the post to the base, and the base anchor feature abuts the post anchor feature.