Friction Hinge for Tablet Kickstand with Constant Gap
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Solution Overview
Problem
Kickstands for portable computing devices, such as tablets, typically offer a limited number of discrete screen angles, which restricts user experience and may not effectively handle usage loads or accidental overloads, especially when rotated beyond 90 degrees.
Innovation Solution
A friction hinge mechanism with a band/shaft coupling and telescoping linkage that allows 180-degree rotation while maintaining a constant gap between the kickstand and the device enclosure, providing sufficient torque to support usage and abuse loads, and incorporating features like notches and wear plates to manage friction and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a telescoping hinge mechanism is used to enable continuous angle adjustment, then screen angle adaptability is improved, but device complexity increases
Solution Approach 1:
The hinge mechanism is divided into two independent functional components: a telescoping linkage system for angle adjustment and a friction hinge for rotation control. This segmentation allows each subsystem to perform its specific function independently, achieving continuous angle adaptability while managing overall system complexity through modular design
Solution Approach 2:
The friction hinge is integrated within the telescoping linkage structure, with the friction shaft and band nested inside the linkage mechanism. This nesting allows the friction control mechanism to be housed within the existing structural envelope, adding rotational control functionality without significantly increasing external dimensions or overall complexity
2Adaptability or versatility
If the kickstand is designed to support 180-degree rotation, then usage scenario versatility is improved, but structural strength requirements increase
Solution Approach 1:
The hinge mechanism provides differentiated strength characteristics at different rotation angles, with maximum torque capacity available when needed to support various usage scenarios. The friction control system allows the structure to engage at specific angles while maintaining strength requirements only where necessary, rather than requiring uniform high strength throughout the entire 180-degree range
Solution Approach 2:
The friction hinge provides dynamic torque control that adapts to different rotation angles and usage conditions. The friction force can be adjusted to provide sufficient holding torque at each angle while allowing smooth rotation during adjustment, enabling versatile positioning without requiring the structure to continuously withstand maximum loads throughout the entire rotation range
3Manufacturing precision
If friction coupling is used to maintain constant gap during rotation, then manufacturing precision is improved, but force required for operation increases
Solution Approach 1:
The friction hinge utilizes controlled friction forces to maintain a substantially constant gap between the kickstand and device enclosure during rotation. By adjusting the friction parameters, the system achieves consistent gap maintenance while managing the operational force requirements through optimized friction characteristics
4Reliability
If wear plates and friction management features are added to ensure durability, then reliability is improved, but device complexity increases
Solution Approach 1:
The friction hinge incorporates wear plates and friction management features that are integrated into the existing hinge structure, allowing the mechanism to self-regulate friction and wear characteristics. These components work together to distribute wear evenly and maintain reliable operation throughout the device lifecycle without requiring additional complex maintenance or adjustment mechanisms
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
Enables continuous adjustability of screen angles, supports usage and accidental loads, and maintains performance throughout the device's lifecycle with reduced force required for opening and closing, enhancing user experience and durability.
Implementation Method 1
a friction band, both of which are configured to substantially surround the friction shaft
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Technologies are generally described for a kickstand or similar support device connection mechanism in conjunction with computing devices. A substantially constant gap may be maintained between the kickstand and the device enclosure across the hinge rotation spectrum allowing the hinge and/or the kickstand to be level with the device enclosure. The connection mechanism may support various usage loads and rotation angles up to about 180 degrees, as well as allow for low force opening to a first position.