Adjustable Roof Window Hinge Braking Mechanism
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Solution Overview
Problem
The existing braking systems in roof window hinges, which rely on leaf springs for controlled motion, experience degradation over time due to repeated loading and unloading, leading to inconsistent friction and uncontrolled sash movement, making maintenance or replacement impractical for end users.
Innovation Solution
A hinge assembly with an adjustable braking mechanism that allows users to restore the braking force without disassembling the window, using a compressible tensioning apparatus or cam system accessible by opening the window, which can be adjusted using a screwdriver or similar tool to increase the frictional resistance of the braking means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leaf spring is used as a braking element in the hinge assembly, then the sash motion can be controlled through frictional force, but the braking force degrades over time due to repeated loading and unloading
Solution Approach 1:
The patent changes the physical parameters of the braking system by replacing the elastic leaf spring with an inelastic friction pad. This fundamental parameter change eliminates the degradation issue inherent in elastic materials that lose resistance over time. The friction pad maintains consistent frictional force throughout its service life, resolving the contradiction between braking force consistency and service life duration.
Solution Approach 2:
The friction pad is designed as a consumable component that can be easily replaced when worn. Rather than attempting to extend the life of a degrading spring, the system uses a simple, inexpensive friction pad that provides reliable braking until wear occurs, at which point it is replaced. This approach prioritizes consistent performance during the component's life over extending component longevity.
2Ease of operation
If the leaf spring is calibrated and positioned to provide ideal friction, then control over sash motion is achieved, but the system becomes complex and difficult to maintain
Solution Approach 1:
The hinge assembly is segmented into distinct functional components: the friction pad, the adjustable mechanism, and the hinge body. This segmentation allows the friction pad and adjustment mechanism to be accessed and maintained independently without disassembling the entire window or hinge assembly, significantly improving ease of repair while maintaining smooth operation control.
Solution Approach 2:
The system incorporates an adjustment mechanism that enables end-users to maintain optimal braking force themselves without requiring professional service. The adjustable feature allows users to compensate for wear by repositioning the friction pad, making the system self-maintainable and reducing reliance on complex professional repair procedures.
3Ease of repair
If an adjustable mechanism is added to restore braking force, then maintenance becomes possible without disassembly, but the device complexity increases
Solution Approach 1:
The friction pad is mounted on an adjustable mechanism that allows dynamic repositioning during the component's life. This adjustability compensates for wear by enabling the friction pad to be moved to maintain optimal contact pressure and position, providing maintainability without requiring complex replacement procedures or complete disassembly of the hinge assembly.
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 users to maintain consistent braking force across the range of motion without disassembly, ensuring controlled sash movement and preventing damage to other components, thus extending the product's lifespan and user satisfaction.
Implementation Method 1
a braking means for applying a frictional force between the sash mountable portion and the frame mountable portion of the hinge assembly
Implementation Method 2
The means for adjustably controlling the braking force applied by the braking means is a means for adjustably tensioning at least a portion of the braking means
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A hinge assembly having a frame mountable portion (3) and a sash mountable portion (not shown) which are in slidable engagement with each other. The hinge assembly further comprising a braking arrangement (1) for applying a braking force between the sash mountable portion (not shown) and the frame mountable portion (3) of the hinge assembly during at least a portion of the slidable movement therebetween. At least one arrangement for adjustably controlling the braking force applied by the braking arrangement (1) is operably engagable with the braking means.