Rotation Exercising Ball With Fixed Mandrel Axis
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Solution Overview
Problem
Conventional rotation exercising structures face issues such as increased resistance due to complex assembly requirements, noise during rotation, and prolonged assembly time, which hinder smooth operation and increase production costs.
Innovation Solution
A rotation exercising ball structure comprising two shells, pivot seats, holding members, a weight unit, and handle protecting members, where the mandrel is fixed without rotation, and the rotation member is rotated radially and centrifugally, reducing resistance and allowing for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the mandrel and rotation member form a T-shaped construction with the mandrel rotated at its two ends served as fulcrums, then the exercising effect is achieved through centrifugal force, but the mandrel applies larger resistance and the user cannot swing the main body smoothly
Solution Approach 1:
The patent extracts the rotation function from the mandrel and transfers it to a dedicated rotation member. The mandrel becomes a fixed axis while the rotation member with weight performs the rotational exercise, eliminating the resistance issue caused by rotating the mandrel itself.
Solution Approach 2:
Instead of rotating the mandrel as in conventional designs, the patent inverts the approach by making the mandrel fixed and rotating a separate rotation member around it. This reversal eliminates the friction and resistance associated with rotating the central axis.
2Ease of manufacture
If the two ends of the mandrel are disposed in the two shells and the two shells are not assembled exactly, then the two ends of the mandrel, the two bearings, and the two mounting recesses are not located at the same central line, but the mandrel is not rotated smoothly
Solution Approach 1:
The patent removes the mandrel from the rotational path and places bearings directly on the fixed mandrel axis. This separation allows the rotation member to rotate smoothly without requiring precise alignment between shell mounting recesses and the central axis.
Solution Approach 2:
The patent introduces bearings as intermediary elements between the fixed mandrel and the rotation member. These bearings accommodate minor misalignments and ensure smooth rotation even when shell assembly is not perfectly precise.
3Manufacturing precision
If the manufacturer has to assemble the two shells carefully to keep the two ends of the mandrel, the two bearings, and the two mounting recesses at the same central line, then the assembly time is prolonged and the cost is increased
Solution Approach 1:
The patent extracts the alignment requirement from the shell assembly process by separating the mandrel positioning function from the rotation function. The fixed mandrel with centrally located bearings eliminates the need for precise alignment between mounting recesses and the central line during shell assembly.
Solution Approach 2:
The fixed mandrel structure with centrally positioned bearings serves as a self-aligning feature, automatically ensuring proper positioning without requiring careful manual alignment during assembly, thereby reducing assembly time and cost.
4Reliability
If the conventional rotation structure has many parts with complicated procedures of assembly, then the cost of fabrication and production is increased
Solution Approach 1:
The patent combines the mandrel and rotation member into a more integrated structure where the rotation member is mounted on the fixed mandrel. This merging reduces the number of separate components and simplifies assembly procedures while maintaining structural stability and exercise functionality.
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 structure enables smooth and quiet operation, reduces assembly complexity and time, decreases production costs, and allows for adjustable centrifugal force through removable auxiliary weights, enhancing user experience and exercise effectiveness.
Implementation Method 1
The rotation member and the weight are rotated in the hollow ball radially and centrifugally with the mandrel served as an axis
Implementation Method 2
The two bearings are mounted in the two mounting recesses 24
Data Source
AI summary
A rotation exercising ball structure includes two shells, two pivot seats, a weight unit, and two handle protecting members. The two shells are combined to construct a hollow ball. Each of the two shells has a space. Each of the two pivot seats is formed on the space and has a through hole. The weight unit includes a mandrel, a rotation member, two bearings, and a weight. The mandrel has two ends each secured in the through hole of one of the two pivot seats. The rotation member has a first end provided with a mounting hole for mounting the two bearings. The weight connects a second end of the rotation member. The rotation member and the weight are rotated on the mandrel. The two handle protecting members are mounted on the two shells.