Wood-Based Backpack Stiffening Element
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Solution Overview
Problem
Existing backpack stiffening elements, particularly those made of metal and plastics, face issues such as sharp edges and corners causing material damage and user injury, high production costs, sustainability concerns, mechanical disadvantages like stress cracking, and reduced wearing comfort due to inadequate shock absorption and UV resistance.
Innovation Solution
A stiffening element made from wood or wood products with a flat rectangular cross-section, featuring parallel fibers, multiple laminated layers connected with glue, and a specific shape to follow the spine's curvature, providing improved rigidity, reduced weight, and ease of processing, along with a rounded edge design and linseed oil protection for weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal stiffening elements are used to provide high strength, then the structural strength is improved, but the specific density causes the element to become too heavy and stiff
Solution Approach 1:
The patent changes the material parameter from metal to wood, fundamentally altering the density-strength relationship. Wood provides sufficient structural strength for backpack applications while having approximately 1/4 to 1/8 the density of metal, directly resolving the weight issue without sacrificing necessary strength
Solution Approach 2:
The patent uses laminated wood construction, creating a composite structure that optimizes strength-to-weight ratio. Multiple thin wood layers are laminated together with adhesive, providing metal-like strength while maintaining the low density of wood, thus resolving the contradiction between strength and weight
2Device complexity
If thin metal components are used to manufacture filigree stiffening elements, then the structural complexity is reduced, but sharp edges and corners cause the backpack material to be chafed, cut or punctured
Solution Approach 1:
The patent changes the material from metal to wood, which naturally has softer edges and corners. This material parameter change eliminates the hazard of sharp edges damaging backpack fabric while maintaining sufficient structural strength through appropriate cross-sectional dimensions
Solution Approach 2:
The patent specifies that the wood stiffening element should have rounded edges and corners rather than sharp angular features. This geometric modification eliminates the harmful sharp edges that would chafe or puncture backpack material, while the rounded form maintains structural integrity
3Weight of moving object
If plastic stiffening elements are used to reduce weight, then the weight is reduced, but the elements are subject to stress crack due to in-use loading and residual stress conditions
Solution Approach 1:
The patent changes the material from plastic to wood, eliminating the inherent tendency of plastics to develop stress cracks under cyclic loading and residual stresses. Wood's natural fiber structure and elasticity provide superior fatigue resistance without the cracking issues that plague plastic components
Solution Approach 2:
The patent uses laminated wood construction where multiple layers are bonded together. This composite structure distributes stresses across layers and eliminates the residual stress concentrations that cause plastic to crack, while maintaining lightweight properties
4Adaptability or versatility
If plastic stiffening elements are used to achieve any shape, then the adaptability is improved, but the elements show insufficient resistance to UV light radiation and become brittle
Solution Approach 1:
The patent changes the material from plastic to wood, which has inherent UV resistance. Wood does not become brittle under UV exposure like plastics, and can be treated with natural oils or finishes to enhance weather and UV resistance, maintaining reliability in outdoor applications
Solution Approach 2:
The patent uses laminated wood construction that can be combined with UV-resistant coatings or treatments on the surface, creating a composite system that maintains both shape flexibility and UV resistance over time
5Strength
If metallic stiffening elements are used to provide high strength, then the strength is improved, but the production costs increase due to post-treatment efforts to round off edges
Solution Approach 1:
The patent changes the material from metal to wood, which can be more easily shaped and rounded during the cutting and planing processes. This eliminates the need for complex post-treatment operations to round sharp edges, reducing manufacturing steps and costs while maintaining strength
Solution Approach 2:
The patent applies different surface treatments to different parts of the wood stiffening element. The edges and corners receive rounded treatment while the main body maintains its structural form, providing local optimization that reduces manufacturing complexity and cost
6Object-affected harmful factors
If thicker metal stiffening elements are used to avoid sharp edges, then the safety is improved, but the element becomes too heavy and stiff
Solution Approach 1:
The patent changes the material from metal to wood, which naturally provides softer, safer edges without requiring increased thickness. Wood's lower density allows the element to maintain adequate structural strength at thinner dimensions, simultaneously reducing weight and eliminating injury risk through inherent material softness
Solution Approach 2:
The patent specifies rounded edges and corners on the wood stiffening element, creating smooth transitions that eliminate sharp edges and potential injury hazards. This geometric modification provides safety without requiring increased thickness or weight
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 wood-based stiffening element offers enhanced durability, reduced risk of injury, improved carrying comfort, and sustainability by minimizing resource use and recyclability issues, while maintaining mechanical properties and resistance to UV exposure.
Implementation Method 1
the surface of which is protected against the weather with a wood preservative, preferably linseed oil
Implementation Method 2
multiple laminated layers connected with glue
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The element (1) has an upper section (5), a middle section (10) and a lower portion (15), where the stiffening element is made of regenerating raw material and timber or timber products. The upper section comprises an S-shaped bend (20) and the lower portion comprises a kink (25), where width of the stiffening element is ranged from a specific centimeter to maximum width of a spine portion. A surface of the stiffener element is designed in a smooth manner and provided with wood preservative i.e. linseed oil, to be protected against influences from the weather. An independent claim is also included for a backpack.