Directional Friction Hinge Using Pneumatic Air Flow Restriction
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Solution Overview
Problem
Current friction hinges do not provide resistance in one specific pivoting direction, allowing free rotation in one direction while offering resistance in the other, which is not met by existing market solutions.
Innovation Solution
A friction hinge design incorporating a restricting module with a mounting base, control plate, valves, piston rod, and return spring, which adjusts air flow to create resistance when pivoted in a specific direction by increasing pressure in a regulating chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional friction hinge is used, then rotation is allowed in any angle, but resistance is provided in all directions rather than being directional
Solution Approach 1:
The hinge is divided into distinct functional modules: a support member, a pivot member, and a restricting module. The restricting module itself is segmented into a control plate with curved holes, a piston rod, and a regulating chamber. This segmentation allows the directional resistance function to be added as a separate controllable subsystem rather than requiring complete redesign of the entire hinge mechanism.
Solution Approach 2:
A piston rod acts as an intermediary element between the control plate and the regulating chamber. When the control plate rotates, it moves the piston rod, which in turn regulates air flow through the regulating chamber. This intermediary mechanism translates rotational motion into controlled air flow resistance, enabling directional damping without direct mechanical contact that would increase complexity.
2Force
If air flow restriction is added to provide directional resistance, then resistance in one direction is improved, but the device complexity increases due to additional components
Solution Approach 1:
The patent uses pneumatic principles by introducing a regulating chamber that controls air flow between the interior and exterior of the hinge. The piston rod moves within this chamber to restrict or allow air flow based on the direction of rotation. This pneumatic mechanism provides smooth, adjustable directional resistance force without requiring complex mechanical springs, dampers, or multiple friction elements.
Solution Approach 2:
The control plate serves multiple functions: it acts as a structural component of the hinge, a rotational actuator for the piston rod, and a flow control element for the air regulation system. The curved holes in the control plate simultaneously provide structural integrity and define the air flow path. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
3Ease of operation
If a restricting module with piston rod and regulating chamber is implemented, then controlled resistance is achieved, but manufacturing complexity increases
Solution Approach 1:
The piston rod is positioned within the regulating chamber, and the control plate with curved holes is integrated into the support member structure. The restricting module is nested within the existing hinge architecture, with the air flow path embedded in the control plate's curved holes. This nesting approach allows the complex pneumatic system to be manufactured as integrated assemblies rather than separate components requiring precise alignment during manufacturing.
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 controlled and directional resistance in the friction hinge, ensuring smooth operation in one direction while providing increased resistance in the opposite direction, enhancing functionality in applications like doors and windows.
Implementation Method 1
When the control panel 32 is pivoted to rotate the pivot base 31 in a counterclockwise direction toward the front surface 211 of the mounting base 21, a pressure in the regulating chamber 131 between the pivot panel 311 of the pivot seat 31 and the front surface 211 of the mounting base 21 is increased
Implementation Method 2
The return spring 27 has two ends, one end is attached to the recess surface 2131 of the mounting recess 213 of the mounting base 21 adjacent to the control plate 22, and the other end is attached to the control plate 22
Implementation Method 3
A friction hinge is a hinge that provides frictional engagement between two objects, allowing any rotation angle between them
Data Source
AI summary
A friction hinge with its motion restricted in one pivoting direction includes a support member, a restricting module, and a pivot member. The restricting module is mounted on the support member. The restricting module has an air flow opening. The pivot member is pivotable relative to the support member and the restricting module. A regulating chamber is defined between the pivot member and the restricting module. When the pivot member is pivoted in one direction, a pressure in the regulating chamber is increased and the restricting module is actuated to reduce size of the air flow opening, increasing the resistance to pivoting of the pivot member in this pivoting direction.