Foamed Plastic Chain Case with Compressed Folding Lines
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Solution Overview
Problem
Existing chain cases for bicycles are prone to damage and noise issues due to their rigidity, and their installation can be cumbersome, especially when not properly mounted or stored.
Innovation Solution
A chain case with a base element made from foamed plastic, featuring compressed folding lines for flexibility and ease of installation, combined with a laminated elastic covering layer for noise reduction and protection, allowing for a lightweight, aesthetically pleasing, and easily attachable design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid frame is used for the chain case, then strength and rigidity are improved, but the chain case becomes susceptible to damage and creates noise
Solution Approach 1:
The patent applies this principle by using a base element made from foamed plastic with compressed folding lines that provide flexibility. The covering layer encases the base element, creating a protective shell that can deform elastically under impact rather than breaking like rigid materials. This flexible construction allows the chain case to absorb impacts from improper storage or handling without permanent damage.
Solution Approach 2:
The patent applies this principle by combining foamed plastic (providing lightweight cushioning and flexibility) with a covering layer (providing protection and aesthetic appearance). This composite structure achieves both the strength needed for protection and the flexibility needed to avoid damage from impacts, resolving the contradiction between rigidity and reliability.
2Strength
If a rigid frame is used for the chain case, then strength is improved, but noise is generated when the chain catches against the chain case
Solution Approach 1:
The flexible base element made from foamed plastic with compressed folding lines acts as a noise-dampening shell that prevents the chain from catching and generating noise. The flexible covering layer further isolates the chain from the base element, reducing noise transmission while maintaining the structural strength needed for protection.
Solution Approach 2:
The foamed plastic base element with its cellular structure provides inherent noise absorption capabilities. The porous/foamed structure dampens vibrations and reduces noise generation from chain contact while maintaining the overall strength of the chain case through its composite construction.
3Strength
If a rigid frame is used for the chain case, then protection is improved, but installation becomes cumbersome
Solution Approach 1:
The flexible base element with compressed folding lines can be easily bent and shaped to fit around the bicycle chain, making installation simple and intuitive. The covering layer can be laminated or attached to the pre-formed base element, creating a complete protective chain case that maintains its flexibility for easy mounting while providing robust protection.
4Ease of operation
If the base element is made from foamed plastic, then flexibility and ease of installation are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies this principle by using compressed folding lines in the foamed plastic base element. The compression process creates permanent bends at specific locations, transforming the material's shape while maintaining its flexibility. This allows the base element to be easily formed into the desired chain case geometry with integrated folding lines for installation, simplifying the overall manufacturing process despite the flexibility requirements.
Solution Approach 2:
The combination of foamed plastic base element with a covering layer creates a composite structure where the manufacturing steps are sequential and modular. The base element can be formed independently with compressed folding lines, then the covering layer is laminated or attached, dividing the manufacturing process into manageable stages that reduce overall complexity.
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 muffles chain noise, reduces the risk of damage from impacts, and simplifies mounting by providing a flexible and lightweight chain case that is less susceptible to damage and easier to install, while maintaining protection and appearance.
Implementation Method 1
Since the base element is made from a foamed plastic, the noise of the chain is effectively muffled by the chain case
Implementation Method 2
one or more locations of the layer of foamed plastic are compressed along a line, such that the thickness of the layer at these one or more locations is thinner, and these one or more locations form folding lines of the chain case
Implementation Method 3
The covering layer protects the foamed plastic against scratches or the like and also helps determine the appearance of the chain case
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Chain case (1) comprising a base element (2) and a covering layer (3) which at least partially covers at least one side of the base element (2), wherein the base element (2) is made from a layer of pliable foamed plastic and method for manufacturing such a chain case (1).