Bicycle Loop Stay Housing Layout for Smooth Dropper Post Actuation
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Solution Overview
Problem
Bicycles with dropper seat posts face challenges in efficiently actuating the locking mechanism while riding, particularly in routing the transmission device from a remote actuator to the locking mechanism, which can be cumbersome and prone to damage.
Innovation Solution
The design incorporates a control housing with a loop stay and a motor assembly that positions the control housing in the frame structure, allowing for a looped routing of the control housing around the loop stay, facilitating smooth actuation of the dropper seat post and reducing the risk of damage by avoiding sharp turns and using the frame structure's volume efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control housing is routed directly from the remote actuator to the locking mechanism, then the routing path is shorter and simpler, but the control housing is prone to damage from sharp turns and difficult to actuate smoothly
Solution Approach 1:
The patent implements a loop stay that creates a curved, looped routing path for the control housing instead of sharp angular turns. This curved path allows the control housing to bend smoothly around the loop stay, reducing stress concentrations and preventing damage while maintaining routing efficiency.
Solution Approach 2:
The loop stay serves as an intermediary structural element that mediates between the remote actuator and the locking mechanism. It provides a dedicated routing path that protects the control housing from damage while facilitating smooth actuation, effectively decoupling the routing complexity from the actuation mechanism.
2Ease of operation
If the control housing is routed through the frame structure with a loop stay, then the actuation becomes smoother and damage risk is reduced, but the frame structure complexity increases
Solution Approach 1:
The loop stay serves multiple functions: it structures the frame, provides a routing path for the control housing, protects against sharp bends, and facilitates smooth actuation. By making the frame structure element multi-functional, the patent avoids adding separate dedicated components that would increase overall complexity.
Solution Approach 2:
The patent merges the routing function with the frame structure itself by integrating the loop stay into the frame design. This combines the structural support function with the cable routing function, eliminating the need for separate routing channels or protective sleeves that would add complexity.
3Reliability
If the loop stay is positioned below the dropper seat post, then the control housing routing avoids sharp turns and reduces damage risk, but the available space for routing is reduced
Solution Approach 1:
The loop stay utilizes the vertical dimension by positioning itself below the dropper seat post, creating a downward loop that routes the control housing in three-dimensional space. This dimensional approach allows the routing path to bypass obstructions and avoid sharp turns while efficiently using the available volume within the frame structure.
Data Source
AI summary
A bicycle comprises a front wheel, a rear wheel, a frame structure including a hollow seat tube. The bicycle further comprises a dropper seat post supported by the hollow seat tube, a loop stay positioned in the frame structure below the dropper seat post, and a control housing positioned in the frame structure for actuating the dropper seat post. The control housing includes a lower loop wrapped around at least a portion of the loop stay. The bicycle may further comprise a motor assembly coupled to the frame structure by a motor fastener, wherein the loop stay is coupled to the frame structure by the motor fastener. The frame structure may further include a top tube and a diagonal tube (e.g., a sided tube) coupling the top tube with the hollow seat tube, and the control housing may be at least partially positioned in the diagonal tube.