Weighted Bag Shell and Handle Layout for Stable Load Control
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Solution Overview
Problem
Existing weightlifting devices, particularly non-rigid, flexible bags, experience unpredictable forces and non-uniform loading due to shape changing and handle coupling issues, leading to material deterioration and failure.
Innovation Solution
A weighted bag with an outer shell and adjustable straps to secure weighted articles, featuring a closure mechanism and a seamless bottom, allowing for adjustable constriction or expansion to stabilize the contents and prevent material movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-rigid, flexible devices are used for weightlifting, then adaptability and versatility are improved, but reliability deteriorates due to unpredictable forces and non-uniform loading
Solution Approach 1:
The patent employs a flexible outer shell made of durable material that can deform under load while maintaining structural integrity. This flexible shell design allows the bag to adapt to different handling methods and loading conditions while preserving reliability through careful material selection and structural design that distributes stresses uniformly throughout the shell.
Solution Approach 2:
The patent incorporates dynamic elements such as adjustable straps and closure mechanisms that can be modified based on loading conditions. The straps can be tightened or loosened to accommodate different weight configurations, and the closure can be adjusted to secure the contents firmly, allowing the device to adapt its structural characteristics to maintain reliability under varying operational conditions.
2Ease of operation
If handles are coupled to flexible bags, then ease of operation is improved, but strength deteriorates due to stress concentrations at stitching locations
Solution Approach 1:
The patent introduces intermediary elements such as reinforced strap assemblies that act as mediators between the handle and the bag body. These straps distribute the loads from handle manipulation across larger areas of the flexible shell, reducing stress concentrations at any single stitching location while maintaining ease of operation through the handle coupling.
Solution Approach 2:
The patent applies local reinforcement at critical stress points where handles couple to the bag. By concentrating additional material strength and reinforced stitching at these specific locations rather than uniformly throughout the entire bag, the design maintains ease of operation while locally enhancing strength to prevent failure at the handle coupling points.
3Adaptability or versatility
If flexible materials are used for the bag, then adaptability is improved, but durability worsens due to material deterioration from unpredictable forces
Solution Approach 1:
The patent utilizes flexible shells constructed from high-durability materials specifically selected for their resistance to deterioration from unpredictable forces. The shell design allows controlled flexibility for adaptability while the material properties and structural reinforcement ensure long-term durability even under varied and unpredictable loading conditions during weightlifting exercises.
Data Source
AI summary
A shell assembly configured for holding one or more weighted articles includes an outer shell defining a cavity configured for receiving the article(s) therein, with a top, a bottom, and a shell opening providing access to the cavity. An extendible handle includes a grip, and a tether connected to the outer shell and the grip and extending between the outer shell and the grip, where the tether has flexible and rigid portions each forming a portion of the length of the tether. A storage compartment defined by an elongated sheath is positioned on the top of the outer shell and has an opening accessible from the exterior of the outer shell to receive the handle. The handle is moveable between a retracted position, where the handle is retracted into the storage compartment, and an extended position, where the handle extends outside the compartment and away from the outer shell.