Furniture Hinge Spring Wear Reduction via Sliding Element
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Solution Overview
Problem
Furniture hinges with high spring loads for generating closing and opening forces tend to break after a certain number of movements, leading to a short lifespan.
Innovation Solution
Incorporating a slider with a sliding body attached to the spring, which can be made of plastic and a metal spring, such as steel, to distribute forces and reduce wear, along with a control cam on an articulated lever, and optionally featuring a lubricant reservoir and a non-cylindrical outer contour for enhanced durability and friction reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high spring load is used to generate closing and opening forces, then the furniture hinge can provide sufficient closing force, but the spring breaks after a certain number of movements
Solution Approach 1:
A sliding element is introduced as an intermediary component between the spring and the control cam. This sliding element distributes the contact forces over a larger area, reducing stress concentration on the spring. The spring maintains its closing force function while the sliding element protects it from excessive wear and breaking, thereby resolving the contradiction between force generation and reliability.
2Reliability
If a sliding element is added to distribute forces and reduce wear, then the spring lifespan is increased, but the device complexity increases
Solution Approach 1:
The sliding element serves as a simple intermediary component that can be attached to the existing spring. It distributes contact forces from the control cam over a larger area, reducing wear on the spring without requiring fundamental redesign of the hinge structure. This minimal addition achieves reliability improvement with limited complexity increase.
Solution Approach 2:
The sliding element changes the contact parameters between the spring and control cam by distributing force over a larger surface area. This parameter change (from point contact to surface contact) reduces stress concentration and wear, extending spring lifespan while adding only a simple component to the existing structure.
3Reliability
If the sliding element is made of plastic with a non-cylindrical outer contour, then wear is reduced and friction is lowered, but manufacturing precision requirements increase
Solution Approach 1:
The sliding element's outer contour is designed with a non-cylindrical shape that provides a larger contact surface area with the control cam. This geometric parameter change distributes contact forces more evenly, reducing wear and friction. The plastic material selection complements this geometric change to achieve low-friction operation while managing manufacturing precision requirements.
Solution Approach 2:
The sliding element is made of plastic material combined with a specifically designed non-cylindrical geometry. This composite approach (material + shape) leverages the low-friction properties of plastic while the non-cylindrical contour distributes contact forces, achieving superior wear resistance that compensates for moderate manufacturing precision variations.
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 design significantly increases the lifespan of the furniture hinge by reducing wear and maintaining consistent spring properties, while keeping costs low and allowing for easy assembly and retrofitting.
Implementation Method 1
the spring is designed as a torsion spring and has at least a circular cross-section in some areas, wherein the control cam runs along the spring to generate a closing force and/or opening force
Implementation Method 2
the sliding body has at least one reservoir for a lubricant. By incorporating a reservoir into the sliding body, the control cam and/or the spring can be supplied with a lubricant that can be introduced into the reservoir
Data Source
Figure 1
Figure 2~3a
Figure 3b
AI summary
The invention relates to a furniture hinge (100), comprising at least one control cam (3, 13) and at least one spring (2, 12), wherein the control cam (3, 13) moves along on the spring (2, 12) in order to produce a closing force and/or opening force, wherein a sliding element (1, 11, 21, 31) is attached to the spring (2, 12) and/or to the control cam (3, 13). The control cam (3, 13) or the spring (2, 12) moves along on the sliding element.