Bicycle Down Tube Clips for Quick Replacement and Flex Control
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Solution Overview
Problem
Existing bicycle frames with removable down tubes face difficulties in quick and easy replacement while maintaining secure connections and preserving flex characteristics.
Innovation Solution
A replaceable down tube assembly with transverse mounting pins and end fittings that allow for limited pivotal movement, using synthetic resin clips with inherent lubricity for secure attachment and easy replacement, enabling separate replacement of down tubes and end fittings without requiring simultaneous replacement of both.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If removable down tube design is used, then customization and replacement ease is improved, but connection security and structural stability deteriorates
Solution Approach 1:
The down tube assembly is segmented into three main components: the down tube body, end fittings, and mounting pins. This segmentation allows the down tube to be easily removed and replaced by detaching the end fittings from the mounting pins, while each component maintains its structural integrity. The end fittings act as intermediate elements that connect the down tube to the frame, enabling simple replacement without compromising the overall connection security.
Solution Approach 2:
The end fittings serve as intermediary elements between the down tube and the mounting pins. These fittings provide a standardized interface that ensures secure connection while allowing for easy detachment. The end fittings incorporate features such as recesses that fit over the mounting pins and resilient arcuate portions that provide controlled flexibility, maintaining connection security while enabling replacement ease.
2Stability of the object's composition
If rigid connection is used, then structural stability is improved, but down tube flex characteristics and shock absorption deteriorate
Solution Approach 1:
The connection between the down tube and frame is made dynamic rather than rigid. The end fittings incorporate resilient arcuate portions that allow controlled movement and flexing. This dynamic connection maintains structural stability during normal riding conditions while absorbing shocks and vibrations, preventing them from being transmitted directly to the frame. The resilient portions can deflect within specific limits while maintaining the connection.
Solution Approach 2:
The end fittings incorporate flexible elements in the form of resilient arcuate portions. These flexible sections allow the down tube to flex slightly relative to the frame, providing shock absorption while maintaining overall structural stability. The flexible portions are designed to deflect within controlled limits, ensuring that the down tube remains securely connected while accommodating vertical deflections and vibrations.
3Reliability
If complex mounting mechanism is used, then connection security is improved, but replacement speed and ease of operation deteriorate
Solution Approach 1:
The mounting mechanism is segmented into simple, discrete components: end fittings with recesses and mounting pins with locking features. This segmentation allows for a secure connection through simple geometric interlocking rather than complex mechanisms. The end fittings have transverse recesses that fit over the mounting pins, providing inherent security while allowing for quick attachment and detachment without requiring tools or complex操作步骤.
Solution Approach 2:
The end fittings incorporate self-centering and self-locking features through their geometric design. The transverse recesses in the end fittings automatically align with and engage the mounting pins when brought together, providing secure connection without requiring precise manual alignment or additional locking operations. The resilient arcuate portions provide automatic tension that maintains the connection security while allowing for easy release when force is applied.
4Ease of operation
If lubrication is added to enable pivotal movement, then ease of operation is improved, but device complexity and maintenance requirements deteriorate
Solution Approach 1:
The material properties of the end fittings are changed to provide inherent lubricity. The end fittings are made from synthetic resin materials that naturally exhibit low friction characteristics, allowing smooth pivotal movement without requiring external lubrication. This material selection provides the necessary ease of operation for detaching and attaching the down tube while avoiding the complexity and maintenance requirements of lubrication systems.
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
Facilitates quick and secure attachment and detachment of down tubes, allowing for customization of flex characteristics and aesthetic changes without the need for replacing the entire frame, while maintaining the down tube's secure connection and flexibility.
Implementation Method 1
The down tube member comprises an elongated tube having a resilient arcuate portion
Implementation Method 2
the end fittings are formed from a synthetic resin having sufficient lubricity to permit pivotal movement of the end fittings on the pivot pins without requiring lubrication of the interface between the pivot pins and end fittings
Data Source
AI summary
A bicycle frame having a replaceable flexible down tube assembly, wherein the down tube assembly includes a resilient arcuate down tube member with connectors in the form of releasable mounting clips removably attached to the ends of down tube member. The clips clamp on transverse mounting pins in stems attached to the bicycle frame at the ends of the down tube assembly. The clips are releasable to remove the down tube assembly from the frame for replacement or substitution of a down tube having different performance or appearance characteristics. The clips are removable from the down tube for separate replacement of clips and the down tube.