Hinge Spreader Distributes Load on Spring Finger
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Solution Overview
Problem
Toggle-type hinges for kitchen cupboards face wear issues due to frictional forces between the nose section and the spring finger, leading to reduced lifespan, especially when the nose section engages the spring finger at discrete points.
Innovation Solution
A channel-shaped spreader is designed to fit over the spring finger, distributing the load and providing line contact with the nose section, thereby reducing wear and increasing the hinge's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the nose section engages the spring finger at discrete points, then the hinge mechanism is simple in construction, but frictional wear increases and lifespan decreases
Solution Approach 1:
The spreader acts as an intermediary component between the nose section and the spring finger. Instead of direct engagement between these two elements, the spreader mediates the interaction by providing a distributed contact surface. The nose section engages the spreader, which in turn engages the spring finger along its entire length, eliminating the harmful discrete point contact and distributing the frictional forces.
Solution Approach 2:
The engagement interface is transformed from a discrete point contact (zero-dimensional) to a continuous line contact (one-dimensional). The spreader extends along the spring finger, converting the localized engagement at a single point into a distributed engagement along the length of the spring finger, thereby reducing stress concentration and wear at any single location.
2Device complexity
If the nose section engages the spring finger directly, then the device has fewer components, but frictional forces cause increased wear
Solution Approach 1:
The spreader serves as a mediator component that inserts itself between the nose section and the spring finger. This additional element, while increasing component count, eliminates the harmful direct frictional contact by distributing the engagement forces across the entire length of the spring finger through line contact engagement.
3Reliability
If the spring finger is engaged over its whole length, then wear is reduced and lifespan is increased, but the device complexity increases
Solution Approach 1:
The spreader is designed with specific local characteristics: it has a central planar plate with upstanding sidewalls forming a channel shape. This localized structural feature allows the spreader to engage the spring finger along its entire length while maintaining a relatively simple overall construction that can be integrated into the existing hinge design.
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 spreader design enhances the hinge's durability by distributing the load and reducing frictional wear, resulting in a longer lifespan with minimal adaptation to the standard manufacturing process.
Implementation Method 1
a spring formed of bent wire... arranged to exert a force on the link mechanism to assist the closing movement of the hinge
Implementation Method 2
frictional forces in operation of the hinge that will tend to cause wear to the nose section and/or finger
Data Source
Figure 1~4
AI summary
A hinge (10) is provided with two elements (12, 20) pivotally connected together for relative rotational movement about a hinge axis. The hinge has a spring (13) formed of bent wire. The spring is mounted on one of the elements and a mechanism causes it to apply a biassing force between the two elements over at least part of their relative rotational movement. The biassing force is transmitted via a finger (19) on the spring. A spreader (24) is arranged to fit over the finger for engagement with the other element. The spreader extends continuously over the finger and engages substantially the whole of it.