Roller Shutter Lock Coating to Reduce Apron Wear
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Solution Overview
Problem
Existing roller shutter locks cause wear and tear on the softer apron material due to friction during winding and unwinding, leading to unsightly marks and reduced lifespan.
Innovation Solution
A roller shutter lock with a coating layer made of abrasion-resistant material, integrated with the lock body, reduces friction and wear by interposing between the apron and the lock during movements, fixed through bi-material injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid lock material (polyamide filled with glass fibers) is used, then the lock provides sufficient strength and durability, but the apron surface experiences wear and develops unsightly marks
Solution Approach 1:
A coating layer made of elastomeric thermoplastic material is applied to the outer surface of the lock body, serving as an intermediary between the rigid lock and the softer apron. This coating layer has low friction properties that prevent wear marks on the apron while the rigid lock body maintains its structural strength and durability
Solution Approach 2:
The lock is constructed as a composite structure with a rigid polyamide filled with glass fibers as the base material for strength, combined with an elastomeric thermoplastic coating layer on the surface that provides low friction and wear protection for the apron
2Object-affected harmful factors
If a bi-material injection is used to create a low friction skin on the link, then the apron is protected from scratches, but the skin tends to tear off over time reducing the link's useful life
Solution Approach 1:
The coating layer material properties are optimized by selecting an elastomeric thermoplastic material with appropriate hardness and elasticity parameters, making it softer and more compliant than previous solutions, which prevents tearing while maintaining scratch protection
Solution Approach 2:
The coating layer is applied specifically to the outer surface of the lock body where contact with the apron occurs, providing localized protection exactly where needed without compromising the overall structural integrity or durability of the lock assembly
3Object-affected harmful factors
If an additional protective layer is added to the lock, then the apron wear is reduced, but the manufacturing complexity increases
Solution Approach 1:
The protective coating layer is integrated with the lock body through bi-material injection molding, combining the protective function and the structural function into a single unified component that is manufactured as one piece, eliminating the need for separate assembly steps
4Ease of operation
If a coating layer is applied during lock manufacture, then no additional installation operations are needed, but the manufacturing process becomes more complex
Solution Approach 1:
The protective coating layer is applied to the lock body during the manufacturing process itself, before the lock is installed. This preliminary action ensures the protective function is already in place, eliminating the need for additional installation operations or post-installation maintenance
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 minimizes apron wear, preventing unsightly marks and extending the lock's lifespan without additional installation steps.
Implementation Method 1
the apron presses and rubs on the lock, which leads to surface wear of the apron
Implementation Method 2
reduce wear of the apron during the winding and/or unwinding movements
Implementation Method 3
The coating layer is fixed to the body by bi-material injection
Data Source
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AI summary
This roller shutter lock (200') is configured to connect a roller shutter curtain to a winding tube for that curtain (36) and includes a first link (203) with a body (208) having an external surface (206A), oriented towards the curtain when the curtain is wound around the tube. The external surface is at least partially covered with a coating layer (214) made of an abrasion-resistant material, which is made of a synthetic polymer material and which is attached to the body by two-component injection molding.