Balancing Arm Friction Hinge With Self-Centering Clamp Surfaces
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Solution Overview
Problem
Traditional adjustable friction hinges in balancing arms are complex, costly, and prone to assembly issues and play, which can lead to wear and collapse under load.
Innovation Solution
A friction hinge with a self-releasing clamp connection using tapered contact surfaces that form both a bearing and friction surface, reducing parts count and allowing for self-centering and improved load distribution, and optionally using plastics for controlled friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional adjustable friction hinge with multiple parts (bushings, friction plates, screw clamp connection) is used, then the friction can be adjusted to balance the load, but the device becomes complex and costly to manufacture
Solution Approach 1:
The patent combines multiple separate components (bushings, friction plates, bearing surfaces) into a single integrated friction hinge assembly. The head and socket are formed as one piece that incorporates all friction and bearing functions, eliminating the need for multiple separate parts while maintaining the adjustable friction capability.
Solution Approach 2:
The friction hinge is designed to perform multiple functions simultaneously: it provides friction for load balancing, acts as a bearing surface for pivoting motion, and includes self-centering capability. This multi-functionality is achieved through the integrated head and socket design that combines features previously requiring separate components.
2Manufacturing precision
If accurately machined cylindrical steel bushings with flattened sides are used to prevent rotation and provide bearing surface, then the assembly is precise, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent extracts the essential function of the bushings (providing a bearing surface and preventing rotation) and integrates it directly into the head and socket structure. The flattened sides and cylindrical geometry are incorporated into the main friction hinge body rather than being separate machined components, simplifying manufacturing while maintaining precision.
Solution Approach 2:
The bearing surface function previously requiring separate machined bushings is merged into the friction hinge head and socket assembly. The cylindrical geometry with flattened sides is formed as an integral part of the friction hinge, eliminating the need for separate bushing manufacturing and assembly steps.
3Reliability
If a screw clamp connection traverses through bushings to provide friction, then the friction can be adjusted, but the assembly requires space for fastener movement resulting in play
Solution Approach 1:
The screw clamp connection is integrated into the friction hinge structure itself rather than traversing through separate bushings. The adjustment mechanism is incorporated directly into the head and socket assembly, reducing the space required for fastener movement and eliminating play that results from separate bushing components.
4Reliability
If friction plates are clamped against folding arm sides via screw clamp connection, then the desired friction is achieved, but the structure becomes more complex with additional clamping components
Solution Approach 1:
The friction plates and clamping structure are merged into a single integrated friction hinge assembly. The head and socket incorporate the friction surfaces and clamping mechanism internally, eliminating the need for separate friction plates and external clamping components while maintaining the desired friction force.
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 simplifies manufacturing and assembly, reduces play, and enhances the self-centering capacity of the friction hinge, making it less complex and cost-effective while maintaining stability under load.
Implementation Method 1
the contact surfaces simultaneously each forming both a bearing surface and a friction surface for the friction hinge
Implementation Method 2
a screw clamp connection extending across the friction hinge to cause the head and the socket to be engaged, the head comprising a tapered contact surface that cooperates with a correspondingly shaped tapered contact surface of the socket in a self-releasing clamp connection
Data Source
AI summary
A balancing arm, comprising a folding arm that extends between a first end that is held in position, and a second end on which a load is carried, a first folding arm portion that extends from the first end of the folding arm being pivotably connected via a hinge to a second folding arm portion that extends to the second end of the folding arm. The balancing arm further comprises a balancing force device that is arranged to act between the first and second ends of the folding arm across the friction hinge to balance the load carried on the second end of the folding arm. The friction hinge is embodied as a friction hinge with adjustable friction, and includes a head and a socket arranged to pivot relative to each other when the folding arm portions pivot.