Espagnolette Fitting Part With Deformable Bearing Gap Insert
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Solution Overview
Problem
Existing drive rod fittings for windows and doors experience increased actuation force and noise due to the degradation of lubricating grease over time, making it difficult to maintain smooth movement and sealing.
Innovation Solution
Incorporating a non-slip, plastically deformable material, such as polyester resin, into the bearing gap to compensate for tolerances and provide long-lasting lubrication, which can be used in partial or full areas of the gap and enhanced with additives for improved sliding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ordinary grease is used to lubricate the bearing gap, then smooth movement is achieved initially, but the grease evaporates or hardens over time leading to increased actuating force and noise
Solution Approach 1:
The patent changes the physical and chemical parameters of the lubricating material by using a plastic material instead of ordinary grease. This plastic material maintains its lubricating properties over time without evaporating or hardening, thus resolving the contradiction between initial smooth movement and long-term durability of lubrication.
Solution Approach 2:
The patent employs a composite approach by combining plastic material with lubricating properties in the bearing gap. This composite material integrates both structural stability and lubricating function, ensuring lasting lubrication while maintaining smooth movement between the scissor arm and link arm.
2Ease of repair
If bearing gaps are made accessible for relubrication, then maintenance is easier, but the fitting structure becomes more complex
Solution Approach 1:
The plastic material in the bearing gap provides self-lubricating properties, eliminating the need for periodic relubrication by a user. The material inherently maintains lubrication over time, making the system self-sufficient and avoiding the complexity of accessible relubrication mechanisms.
Solution Approach 2:
The patent extracts the lubricating function from a separate maintenanceable component (grease that needs replenishment) and integrates it into the bearing gap itself through the plastic material. This integration eliminates the need for separate relubrication operations while maintaining effective lubrication.
3Duration of action of moving object
If plastically deformable material is arranged in the bearing gap, then lasting lubrication is achieved, but the material may affect the precision of component positioning
Solution Approach 1:
The patent applies the plastically deformable material specifically in the bearing gap area where lubrication is needed, rather than throughout the entire component. This localized application ensures that the material provides lubrication where required while minimizing its impact on the overall precision and positioning of the scissor arm and link arm components.
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
Ensures low-friction, noise-free, and even sliding of components, preventing chatter marks and maintaining sealing effectiveness over time, with options for various applications including scissor and multi-joint bearings.
Implementation Method 1
arranging a non-run-resistant, plastically deformable material in the bearing gap. This design allows the plastically deformable material to compensate for tolerances in the bearing gap.
Implementation Method 2
the material's deformability ensures lasting lubrication within the bearing gap. This plastically deformable material thus enables smooth sliding of the components without chatter or noise.
Implementation Method 3
the components are able to slide along each other particularly smoothly if the plastically deformable material has viscous properties.
Data Source
Figure 1
Figure 2~3
AI summary
A fitting component for a window's locking rod mechanism has a plastically deformable material (16) arranged in a bearing gap (14) between two moving components. The plastically deformable material (16) exhibits sliding properties and compensates for tolerances. This permanently prevents noise during the operation of the locking rod mechanism.