Multi-Layer Torsion Bar Spring for Friction Hinge Assembly
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Solution Overview
Problem
Existing hinge assemblies for rotationally attaching members, such as laptop lids, require costly and complex machined springs to assist in opening, which is inefficient and costly to manufacture.
Innovation Solution
A multi-layer torsion bar spring design is used in conjunction with a friction mechanism to store energy during closure and assist in opening, reducing manufacturing complexity and cost while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional machined springs are used in hinge assemblies, then the hinge can assist opening by storing energy during closing, but the manufacturing cost and complexity become extremely high
Solution Approach 1:
The spring is divided into multiple discrete leaves stacked together, where each leaf can be manufactured separately using simple stamping or forming processes, then assembled into the complete spring assembly. This segmentation allows each component to be produced with basic tooling rather than requiring complex machining operations on a single monolithic piece.
Solution Approach 2:
The invention changes the manufacturing parameters from precision machining to simpler forming processes. By specifying appropriate material properties and forming parameters for the spring leaves, the same energy storage function is achieved through less complex manufacturing methods, reducing both cost and manufacturing difficulty.
2Stability of the object's composition
If a friction mechanism is added to hold the first member in desired angular positions, then positional stability is improved, but device complexity increases
Solution Approach 1:
The friction mechanism is merged with the existing hinge shaft and spring assembly components. The friction element is positioned to interact with the hinge shaft in a way that provides positional holding without requiring separate complex mechanisms. The friction mechanism shares space and functional integration with other hinge components, minimizing overall complexity.
Solution Approach 2:
The friction mechanism automatically engages and disengages based on the hinge position and applied loads, providing self-regulating positional stability. The system uses the natural interaction between friction elements and the hinge shaft to maintain position without requiring external control systems or complex actuation 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
The multi-layer torsion bar spring design effectively reduces the cost and complexity of hinge assembly manufacturing while maintaining performance, allowing for efficient rotational movement between closed and open positions with improved user experience.
Implementation Method 1
The present invention includes a spring that assists the opening of the first member relative to the second member by storing energy in the spring during the closing operation
Implementation Method 2
The hinge assembly also includes a friction mechanism that exerts a sufficient frictional force on the hinge shaft such that the first member can be held in a range of desired angular positions
Data Source
AI summary
A friction hinge assembly includes a spring that assists the opening of a first member relative to a second member by storing energy in the spring during the closing operation. The spring is of a unique multilayered torsion bar design.