Roller Skate Bottom Structure Pivoting Hub for Uneven Terrain
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Solution Overview
Problem
Conventional roller skate bottom structures fail to maintain balance and wheel functionality when rolling on uneven ground due to loosened axles.
Innovation Solution
A bottom structure featuring a sole with a frame, hubs, pivotal members, sleeves, and a shaft with enlargements, allowing for limited pivotal movement to maintain horizontal positioning and prevent wheel malfunction on irregular surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bottom structure with fixed axles is used, then the structure is simple, but the axles loosen when rolling on uneven ground causing wheel malfunction
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed axle system into a dynamic one where the pivotal member can pivot relative to the hub. This allows the axle assembly to adapt to uneven ground conditions while maintaining wheel functionality, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent segments the bottom structure into distinct components: hub, pivotal member, sleeves, and shaft. This segmentation allows each component to perform its specific function independently, improving reliability while keeping the overall structure manageable in complexity.
2Reliability
If the bottom structure allows movement on uneven ground, then wheel malfunction is prevented, but the sole may tilt causing instability
Solution Approach 1:
The pivotal member's ability to pivot dynamically allows the bottom structure to accommodate uneven ground while the shaft with enlargements maintains the sole's horizontal positioning, preventing both wheel malfunction and sole tilting simultaneously.
Solution Approach 2:
The shaft with enlargements acts as a pre-positioned stabilizing element that prevents the sole from tilting before instability occurs, while the pivotal member provides beforehand cushioning against ground irregularities that could cause wheel malfunction.
3Reliability
If the axles are tightly secured to prevent loosening, then wheel functionality is maintained, but the structure cannot adapt to uneven ground
Solution Approach 1:
The patent creates a dynamic connection between the axle and hub through the pivotal member that allows controlled movement. The axle remains securely connected through the shaft and enlargements while the pivotal member enables adaptation to uneven terrain, resolving the contradiction between axle security and terrain adaptability.
Data Source
AI summary
A bottom structure of a roller skate includes a sole; a frame secured to the sole and including front and rear supports and two hubs disposed on the front and rear supports respectively; a pivotal member disposed in the hub; two spaced sleeves disposed in the hub wherein the sleeves are further partially disposed in the pivotal member and secured to the pivotal member; a shaft passing through the hub, the pivotal member, and a gap between the sleeves, and rigidly secured to the pivotal member; and two enlargements disposed at two ends of the shaft respectively.