Bicycle Cross Bar Adaptor Quick-Release Mechanism
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Solution Overview
Problem
Existing retractable bicycle cross bar adaptors have complex designs with many parts, leading to high manufacturing costs and difficulty in competing with other products in the market due to their intricate shapes and numerous components.
Innovation Solution
A retractable bicycle cross bar adaptor featuring a bar with a first and second tube, a control unit, and a quick-release mechanism using a lever and block with a cam portion, allowing for easy length adjustment by pivoting the lever to engage or disengage the block with a groove, reducing the number of parts and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a retractable mechanism with multiple springs and slides is used to adjust the length of the cross bar adaptor, then the length adjustment capability is achieved, but the number of parts increases and the manufacturing cost becomes high
Solution Approach 1:
The cross bar adaptor is divided into a first tube and a second tube that can slide relative to each other. The second tube is inserted into the first tube, creating distinct segments that can move independently to achieve length adjustment while maintaining structural integrity.
Solution Approach 2:
The second tube is nested within the first tube, with the second connection end slidably inserted into the first connection end. This nesting arrangement allows one tube to move within the other, providing telescopic functionality with minimal parts.
2Adaptability or versatility
If multiple springs and complex sliding mechanisms are used to enable telescopic movement, then the retractable function is achieved, but the manufacturing cost increases due to intricate shapes and numerous components
Solution Approach 1:
The complex spring-based retention mechanism is extracted and replaced with a simpler cam-based locking system. The cam portion on the lever directly engages with the groove on the tube, eliminating the need for multiple springs and complex sliding mechanisms while maintaining the retractable function.
Solution Approach 2:
The invention uses simpler, more manufacturable components such as a rubber block instead of precision-machined metal parts. The rubber block provides sufficient friction and retention without requiring complex geometries, reducing manufacturing costs.
3Reliability
If a complex securing unit with multiple parts of different sizes and shapes is used, then the locking capability is achieved, but the manufacturing cost becomes high and competitiveness is reduced
Solution Approach 1:
The control unit combines the lever, cam portion, and block into an integrated assembly. The lever with its cam portion directly actuates the block, merging multiple functions into a single coordinated mechanism that reduces the number of separate parts while maintaining reliable locking capability.
Solution Approach 2:
The lever serves multiple functions: it acts as a pivot point, provides the cam portion for locking, and controls the engagement of the block with the groove. This multi-functionality reduces the need for separate components and simplifies the overall design.
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 solution provides a cost-effective and user-friendly method for adjusting the length of the cross bar adaptor, enhancing its competitiveness and reducing manufacturing costs while maintaining secure engagement and easy operation.
Implementation Method 1
The lever includes an eccentric end formed to one end thereof, and the eccentric end pivotably connected between the two lugs and includes a cam portion
Implementation Method 2
The block is made of rubber to provide sufficient friction with the groove to secure the adjusted length of the cross bar adaptor
Data Source
AI summary
A bicycle cross bar adaptor includes a first tube, a second tube and a control unit. The control unit is located between the first and second tubes. Each of the first and second tubes has a hook connected thereto. The second tube has a groove defined axially in an outer surface thereof. The control unit includes a collar in which the first and second tubes are slidably inserted with each other. A hole is defined through the wall of the collar and a block is located in the hole. A block is located in the hole and removably engaged with the groove. A lever is pivotably connected to the collar and has a cam portion to perform as a quick-release to position the block in the groove or away from the groove to adjust the second tube relative to the first sleeve.