Composite Dumbbell Shell Filling for Low-Cost Rust-Resistant Weights
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Solution Overview
Problem
Traditional dumbbells made of cast iron are costly, environmentally unfriendly, and prone to rust, reducing their aesthetic appeal and functionality over time.
Innovation Solution
A method involving prefabricated outer and inner shell halves, mated and sealed to form a unitary weight shell, filled with a mixed slurry, and treated with shaking and sealing, followed by painting and baking, using materials like iron sand and cement to create adjustable and durable weight-type exercise devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional cast iron is used to make dumbbells, then the product has high strength and durability, but the production cost is high and environmental friendliness is poor
Solution Approach 1:
The patent uses composite materials consisting of waste metal particles (iron sand, iron slag) mixed with binding agents (cement, adhesive) to create a filling material that combines the strength characteristics of metal with the binding properties of cement-based materials. This composite approach allows the use of inexpensive waste materials while achieving the required mechanical strength for exercise equipment.
Solution Approach 2:
The patent changes the material parameters by transitioning from pure cast iron to a composite mixture of waste metal particles and binding agents. This parameter change enables the use of lower-cost materials while maintaining structural integrity through the combined properties of the composite material system.
2Strength
If traditional cast iron is used to make dumbbells, then the product has high strength, but material utilization is low and environmental pollution is high
Solution Approach 1:
The patent recovers and reuses waste metal particles (iron sand, iron slag) that would otherwise be discarded. By incorporating these waste materials into the dumbbell construction as functional filling material, the patent transforms waste into a useful resource, significantly improving material utilization and reducing environmental pollution.
Solution Approach 2:
The patent converts harmful waste materials (metal particles that would pollute the environment) into beneficial structural filling material. The waste metal particles, which would normally be discarded as pollutants, are now utilized as the primary weight-providing component, turning an environmental harm into a manufacturing benefit.
3Duration of action of stationary object
If traditional cast iron is used to make dumbbells, then the product has high durability, but the product rusts over time reducing aesthetics and practicability
Solution Approach 1:
The patent uses composite materials where the binding agents (cement, adhesive) and coating layers provide rust protection to the metal particles. The cement-based matrix and protective coatings create a barrier that prevents direct contact between oxygen/moisture and the metal surfaces, eliminating the rusting problem while maintaining durability.
Solution Approach 2:
The patent employs inexpensive protective coatings (paint, adhesive layers) that provide rust protection. These coating layers are simpler and more easily replaceable than traditional rust-resistant metal alloys, offering a cost-effective solution to prevent degradation while maintaining the structural integrity of the dumbbell.
4Weight of moving object
If cast iron is used for dumbbell production, then the product has sufficient weight, but the production process is complex and costly
Solution Approach 1:
The patent segments the dumbbell into two main parts: the shell structure (formed from metal sheets through deep drawing) and the filling material (mixed slurry of waste particles and binding agents). This segmentation allows for simplified manufacturing of each component separately, with the shell providing structural integrity and the filling providing weight, thereby reducing overall production complexity.
Solution Approach 2:
The patent performs preliminary actions by pre-mixing the filling material (metal particles with binding agents) before insertion into the shell. This pre-preparation of the filling material simplifies the assembly process, as the mixture is ready for direct injection or placement into the shell structure without requiring complex on-site mixing or processing equipment.
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
This method reduces production costs, enhances material utilization, and improves environmental sustainability by using waste materials, resulting in a more cost-effective and aesthetically pleasing dumbbell and weight plate with adjustable weights.
Implementation Method 1
prefabricating an outer shell half and an inner shell half; the outer shell half and the inner shell half are both fabricated using a deep drawing process
Implementation Method 2
subjecting the unitary weight shell to a shaking treatment; the shaking treatment to which the unitary weight shell is subjected is carried out by a shaking machine
Implementation Method 3
finishing the surface of the unitary weight shell by painting and baking
Data Source
AI summary
The invention discloses a method of making a weight-type exercise device, comprising the steps of: (1) prefabricating an outer shell half and an inner shell half; (2) forming a slurry inlet port in the outer shell half; (3) mating and sealing the outer shell half with the inner shell half to form a unitary weight shell; (4) pouring a mixed slurry into the unitary weight shell through the slurry inlet port; (5) subjecting the unitary weight shell to a shaking treatment; (6) sealing up the slurry inlet port with a steel plate; and (7) finishing the surface of the unitary weight shell by painting and baking. Compared with traditional one-piece cast iron counterparts, much lower cost can be achieved with a simpler process.