Chain Drive Stripper for Dirt and Moisture Protection
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Solution Overview
Problem
Existing chain drives for windows, flaps, or dome lights are susceptible to wetting and dirt when in the opened position, leading to potential contamination and reduced service life.
Innovation Solution
A chain drive with a stripper made from elastic material, such as EPDM, that engages around chain links to clean them during retraction, preventing dirt and moisture from entering the housing, and is securely fixed to the housing using a tubular holder or flange for effective protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the chain is exposed in the opened position, then the chain drive can operate in both open and closed positions, but the chain becomes wet and dirty
Solution Approach 1:
A stripper made of elastic material is introduced as an intermediary component between the chain and the external environment. The stripper engages with the chain links and performs a stripping action to remove dirt and moisture, thereby protecting the chain without preventing the housing from being opened
Solution Approach 2:
The stripper is designed to automatically engage with the chain when it passes through the opening and performs the cleaning function autonomously during the retraction motion, without requiring additional actuators or external intervention
2Ease of operation
If the opening is made larger, then the chain can pass through easily, but more moisture and dirt can enter the housing
Solution Approach 1:
The stripper is constructed from an elastic material that forms a flexible barrier around the chain. This elastic shell conforms to the chain's shape and creates a protective interface that limits the passage of moisture and dirt into the housing while allowing the chain to move freely
3Stability of the object's composition
If the stripper is made from rigid material, then the structure is stable, but it cannot effectively enclose and clean the chain
Solution Approach 1:
The stripper's material properties are optimized by selecting an elastic material with appropriate durometer characteristics. This parameter selection allows the stripper to be sufficiently stable in structure while remaining flexible enough to conform to the chain's geometry and perform effective cleaning through elastic deformation during engagement
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 effectively prevents dirt and moisture from entering the housing, extending the service life of the chain drive by ensuring the chain remains clean and dry, even in open positions.
Implementation Method 1
the stripper is produced from an elastic material, e.g. from an elastic synthetic material or rubber
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2
AI summary
A chain drive (1), in particular for a window, a flap or a dome light, comprising a housing (2) and an electric motor (8) which, by means of a transmission (9), drives a drive pinion (10) which is in engagement with a chain (5) which is formed from chain links and which is received in a retracted position in the housing (2) and can be conveyed, by means of the drive pinion (10), out of the housing (2) and can then be conveyed again into said housing through an opening therein, wherein a stripper which engages around the chain links of the chain (5) is arranged in the region of the opening on the housing (2), the chain links being able to be guided through said stripper. As a result, wet and dirt can be cleaned at least partially from the chain (5) by the stripper (20) when said chain is being retracted.