Bicycle Handle Rotation Prevention via Segmented Clamping
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Solution Overview
Problem
Bicycle handles with clamping devices surrounding sleeves made of plastic materials are prone to rotational displacement under high forces, posing a safety risk, especially on long barends used in mountain bikes.
Innovation Solution
A rotation-prevention device is integrated between the clamping device and the bicycle handlebar, preferably formed as a slotted ring or segment, connected via a form-fitting arrangement, to prevent rotational displacement by distributing forces and moments effectively, allowing the clamping device to serve both for clamping and holding the barend.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a clamping device surrounds a plastic sleeve to attach the bicycle handle to the handlebar, then the handle can be securely fastened, but rotational displacement occurs under high forces
Solution Approach 1:
The clamping device is segmented into two functional parts: a clamping portion that secures the sleeve to the handlebar, and a separate rotation-prevention device (such as a pin, key, or asymmetric element) that specifically prevents rotational displacement. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
A rotation-prevention device acts as an intermediary element between the clamping device and the sleeve/barend assembly. This intermediate component transfers and distributes rotational forces, preventing the plastic sleeve from rotating while maintaining the clamping connection. The intermediary absorbs the rotational stress that would otherwise cause displacement.
2Ease of operation
If a barend is used on mountain bikes for open landscape riding, then handling capability is improved, but high forces and moments cause rotational displacement of the clamping connection
Solution Approach 1:
The rotation-prevention device is installed in advance on the sleeve or clamping device before the bike is used. This preliminary anti-action counteracts the high forces and moments that will occur during mountain bike riding, preventing rotational displacement before it can happen. The device is pre-positioned to resist the expected directional forces from barend usage.
3Ease of manufacture
If the sleeve is made of plastic material for the clamping connection, then manufacturing is simplified, but creeping of the material occurs under load
Solution Approach 1:
The rotation-prevention device serves as a mediator that protects the plastic sleeve from experiencing high rotational forces directly. By preventing rotation at the source, the device eliminates the creeping loads that would otherwise cause the plastic material to deform over time, allowing the use of simpler plastic materials without compromising long-term strength.
Data Source
AI summary
A bicycle handle, which is suitable in particular for trekking and mountain bikes, comprises a sleeve with a sleeve slot in it. The sleeve is connected to a grip element. For fastening the bicycle handle on a bicycle handlebar, the sleeve is mounted to the bicycle handlebar, and a clamping device is provided in a clamping region of the sleeve. A barend is connected to the clamping device. In order to avoid rotation of the barend, it is provided according to the disclosure that a rotation-prevention device is arranged between the clamping device and the bicycle handlebar.