Bag Carrying Strip Force Distribution
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Solution Overview
Problem
Backpack carrying belts tend to tear due to concentrated forces exerted on small areas, leading to material damage and increased costs for high-strength materials, and existing solutions require stiff connecting elements that are prone to failure.
Innovation Solution
The backpack design features a carrying strip with loop-like outer ends of carrying elements that distribute forces evenly over the strip's width, reducing the risk of damage by using a larger contact area and allowing for adjustable and exchangeable carrying elements with secure fastening options like bolts and nuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carrying belts are fastened to the holder with a hard and stiff connecting element such as a metal fastening screw or hooks, then the fastening appears strong and secure, but the forces concentrate on a small area causing tearing of the carrying belts or holder material
Solution Approach 1:
The connecting element is divided into multiple segments or contact points along its length. Instead of a single stiff connection point, the carrying belt is fastened at multiple locations distributed along the holder, which segments the force transmission and prevents concentration at one point. This segmentation approach maintains overall fastening strength while distributing stresses to prevent tearing.
Solution Approach 2:
The connecting element incorporates regions of different stiffness or compliance along its length. Specific local areas are designed to be more compliant or flexible to absorb and distribute forces, while other areas maintain structural integrity. This local variation in mechanical properties allows the fastening to remain strong overall while preventing force concentration that causes tearing at specific points.
2Reliability
If carrying belts are fastened with stiff connecting elements, then the connection appears secure, but the material choice is limited and costs increase due to requirements for high-strength materials
Solution Approach 1:
The connecting element is constructed as a composite structure combining multiple materials with different properties. This could include combining flexible polymers with reinforcement fibers, or layering different materials to achieve both compliance and strength. The composite construction allows the fastening to maintain reliability while using more cost-effective and versatile material options compared to requiring entirely high-strength materials throughout.
Solution Approach 2:
The mechanical parameters of the connecting element (such as stiffness, elasticity, or geometry) are optimized through design rather than relying solely on high-strength materials. By adjusting parameters like thickness, cross-sectional area, or material elasticity within a broader range of available materials, the connection achieves required reliability without being constrained to expensive high-strength material families, thereby improving ease of manufacture and reducing costs.
3Object-affected harmful factors
If high structural demands are made of the connecting means to prevent tearing, then tearing risk is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The function of preventing tearing is extracted from the primary structure of the connecting means and implemented through a separate, specialized component or feature. For example, reinforcement patches, distributed attachment points, or compliance elements are added as distinct features rather than requiring the entire connecting structure to be overly complex. This separation allows the main connecting means to remain simple while still achieving tearing prevention through the extracted function.
Solution Approach 2:
The connecting element incorporates pre-designed compliance or cushioning features that anticipate and absorb forces before they can cause tearing. These might include flexible sections, energy-absorbing elements, or geometric features built into the connecting means that proactively manage stress distribution. By beforehand cushioning the connection, the design prevents tearing without requiring complex reactive structures, thereby reducing overall device complexity.
Data Source
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AI summary
The invention relates to a bag comprising: - a bag-like holder comprising a rear wall and a carrying strip provided over at least a part of the width of the rear wall, wherein the carrying strip is attached only partially to the rear wall for the purpose of forming at least a passage between the carrying strip and the rear wall; - at least one carrying element to be fastened releasably to the holder for carrying of the bag-like holder by a user, wherein each carrying element comprises a loop-like outer end which extends round the carrying strip in use; - a fastening for fastening an end part of the loop-like outer end of the carrying element to another part of the carrying element.