Adjustable Weight Plate with Compartmentalized Sand Fill
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Solution Overview
Problem
Existing adjustable weight plates for home gym settings are not strong enough for advanced weight training, prone to damage, and lack balance due to hollow construction, making them unsuitable for use with Olympic barbells and incurring high shipping costs.
Innovation Solution
A hollow weight plate design with multiple compartments and a metal center collar for strength, combined with a funnel for easy filling and emptying, using materials like sand or lead shot, and optional internal stiffeners to prevent material shift during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hollow plastic adjustable weights are used for home gym, then shipping costs are reduced and storage is easier, but the weights are not strong enough to withstand advanced weight training use including drops and repeated on/off barbell operations
Solution Approach 1:
The weight plate uses a composite construction combining a plastic outer shell with an inner metal reinforcement structure. The metal insert provides the necessary strength to withstand drops and heavy loads while the plastic exterior maintains shipping and storage advantages. This composite approach resolves the contradiction by integrating materials with complementary properties.
2Ease of operation
If completely hollow interior design is used, then filling with sand is easier, but the sand shifts during use causing unbalanced weight
Solution Approach 1:
The interior of the weight plate is divided into multiple compartments by internal walls. This segmentation prevents sand shifting during use while maintaining ease of filling through the top opening. Each compartment contains a portion of the filler material, ensuring balanced weight distribution during exercise.
3Device complexity
If thin plastic walls are used for adjustable weights, then manufacturing is simpler and shipping is easier, but the walls break under 100 pounds of sand or during repeated use
Solution Approach 1:
The weight plate uses a composite construction combining a plastic outer shell with an inner metal reinforcement structure. The metal insert provides the necessary strength to withstand drops and heavy loads while the plastic exterior maintains shipping and storage advantages. This composite approach resolves the contradiction by integrating materials with complementary properties.
4Adaptability or versatility
If large numbers of cast iron plates are purchased for advanced training, then sufficient weight range is available, but storage becomes difficult and shipping costs become prohibitive
Solution Approach 1:
The weight plate features an adjustable design where the filler material quantity can be varied to create different weight configurations. A single plate can be filled to represent multiple different weight values, replacing the need for multiple fixed-weight cast iron plates. This dynamic adjustability provides weight range versatility while eliminating storage and shipping problems.
Data Source
AI summary
An adjustable weight plate to be used with a standard or Olympic barbell handle, comprising a wide opening that is easy to fill with sand or other loose filler material, multiple inner compartments to separate out the sand and equalize the weight, and reinforcing dividers to strengthen the weight plate. The adjustable weight plate also comprises a metal collar to strengthen the inner radius of the weight plate, and an easy-fill funnel to fill the weight plate with sand.