Bicycle Frame Fork Bumper Impact Protection
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Solution Overview
Problem
Bicycle frames are prone to damage when the front fork collides with the down tube during extreme handlebar rotation, leading to scratches, cracks, and breakage of shifters or brakes.
Innovation Solution
A fork bumper is integrated into the bicycle frame, extending from the underside of the down tube, featuring a resilient outer layer and a rigid base to prevent contact between the fork and the down tube, with converging sides that engage the fork in different pivot directions, and a passageway for cable routing to minimize impact and sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the front fork is allowed to rotate freely during crashes, then steering control is improved, but the fork can hit the down tube causing damage to the frame and components
Solution Approach 1:
A fork bumper is attached to the down tube positioned to receive the front fork when the handlebars are rotated during a crash. The bumper includes a resilient outer layer that cushions the impact before the fork can contact the down tube, preventing damage to the frame and components while still allowing normal steering operation.
Solution Approach 2:
The fork bumper acts as an intermediary element between the front fork and the down tube. During extreme handlebar rotation, the bumper intercepts the fork, preventing direct contact with the down tube. This intermediary component absorbs the harmful impact while allowing the steering mechanism to function normally during regular operation.
2Reliability
If a fork bumper is added to prevent fork-down tube contact, then frame protection is improved, but the device complexity increases
Solution Approach 1:
The fork bumper is divided into distinct functional segments: a base portion that attaches to the down tube and an outer layer that provides cushioning. This segmentation allows each part to perform its specific function efficiently while keeping the overall structure manageable and relatively simple to implement.
Solution Approach 2:
The fork bumper comprises a composite structure with a base portion (typically rigid material for structural support) and a resilient outer layer (softer material for impact absorption). This composite material approach provides effective protection while maintaining a compact and relatively simple design that doesn't significantly increase overall device complexity.
3Force
If the fork bumper has a large contact surface, then impact absorption is improved, but the cable routing becomes more difficult
Solution Approach 1:
The fork bumper is designed with different local qualities: a larger surface area for impact contact to absorb force effectively, and a specific passageway configuration in strategic locations to accommodate cable routing. The outer layer provides the large contact surface for cushioning, while the base portion incorporates openings or channels that allow cables to pass through without interfering with the impact absorption function.
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 fork bumper effectively prevents damage to the frame and fork by absorbing impact and reducing vibration, while maintaining structural integrity and cable organization, thus protecting the frame and fork from collision-induced damage.
Implementation Method 1
a resilient outer layer engageable by the fork to prevent contact between the down tube and the fork
Implementation Method 2
absorbing impact and reducing vibration
Data Source
AI summary
A frame for a bicycle that has a fork and a handlebar. The frame includes a head tube, a bottom bracket adapted to support a crankset, and a down tube coupled between the head tube and the bottom bracket. The frame also has a fork bumper that is coupled to and is disposed on an underside of the down tube. The fork bumper extends outward from the down tube and includes a base and a resilient outer layer engageable by the fork to prevent contact between the down tube and the fork.