Detachable Joggle Joint for Lightweight Bicycle Frame Connections
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Solution Overview
Problem
Conventional folding bicycle frames require reinforced materials and additional weight to enhance structural strength, making them bulky and inconvenient for storage and transportation due to their size and weight.
Innovation Solution
A rod piece connection device with detachable first and second connection pieces forming a joggle joint, allowing the bicycle frame to be assembled or disassembled as needed, reducing volume and weight by eliminating hinges and fasteners, and providing a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforced materials and components are added to enhance the structure strength of the folding bicycle frame, then the strength is improved, but the overall weight increases
Solution Approach 1:
The bicycle frame is divided into separate rod pieces that can be detached and reconnected. The connection pieces incorporate reinforcing structures (protrusion heads, tongue portions, groove portions) that provide structural strength at the connection points without requiring additional reinforced materials throughout the entire frame, thus maintaining strength while reducing overall weight.
Solution Approach 2:
The connection piece integrates multiple functions: it serves as both the joining mechanism and the reinforcement element. The protrusion head with tongue portion and the corresponding groove portion with reinforcing structure are merged into a single integrated component that provides both connection and structural strengthening, eliminating the need for separate reinforced materials.
2Ease of operation
If hinges and fasteners are used to form a bending structure for easy detachment, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The connection mechanism is segmented into distinct functional elements: the protrusion head, the tongue portion, the groove portion, and the reinforcing structure. This segmentation allows for easy assembly and disassembly while keeping each component relatively simple in design, avoiding the complexity of traditional hinge and fastener systems.
Solution Approach 2:
The invention extracts and eliminates the need for traditional hinges and multiple fasteners. Instead, it uses a single integrated connection piece with a protrusion-head structure that combines the functions of hinges and fasteners into one simplified component, reducing device complexity while maintaining ease of operation.
3Strength
If the bicycle frame is made as one piece of integral body through welding, then the structure strength is improved, but the volume increases making it difficult for storage and transportation
Solution Approach 1:
The integral bicycle frame is segmented into multiple detachable rod pieces connected by connection pieces. This allows the frame to be disassembled into smaller components for compact storage and transportation, while the connection pieces incorporate reinforcing structures that maintain structural strength at the joint areas, equivalent to or exceeding traditional welded connections.
Data Source
AI summary
A rod piece connection device, comprising: a first connection piece and a second connection piece. The first connection piece includes a first rod piece connection end and a first joggle joint end opposite to the first rod piece connection end. Wherein, the first joggle joint end includes a protrusion head tongue portion and a neck portion. The second connection piece includes a second rod piece connection end and a second joggle joint end opposite to the second rod piece connection end. The second joggle joint end is located corresponding to the first joggle joint end for them to form into a joggle joint. The second joggle joint end includes a protrusion bottom groove portion and a pillow portion. Wherein the protrusion head tongue portion is disposed corresponding into the protrusion bottom groove portion, and the neck portion is located corresponding to the pillow portion.