Quickly Detachable Bicycle Pedal With Inner Crank Fixing Device
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Solution Overview
Problem
Existing quickly detachable pedal devices for bicycles are complex, costly, and pose safety risks due to their design, which often involves fixing devices at the outer side of the crank, leading to increased risk of accidental unlocking and pedal resistance.
Innovation Solution
A quickly detachable pedal device with a simple structure where the fixing device is installed at the inner side of the crank, utilizing a reducing sleeve and lateral plate module with a return spring to securely lock the pedal shaft without extending to the outer side, allowing for easy one-handed operation and reduced risk of accidental unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the fixing device is installed at the outer side of the crank, then the pedal can be detached quickly, but the device becomes complex and costly with increased safety risks
Solution Approach 1:
The fixing device is inverted from the conventional outer side installation to the inner side installation of the crank. This inversion resolves the technical contradiction by moving the control device away from the hazardous outer side while maintaining quick detachment functionality through the cam mechanism and slot interaction.
Solution Approach 2:
The control device is extracted from the outer side of the crank and relocated to the inner side. This extraction eliminates the safety hazards associated with outer side installation (hitching trousers, accidental unlocking) while preserving the core functionality of quick pedal detachment through the cam and slot mechanism.
2Ease of operation
If the control device is installed at the outer side of the crank, then the pedal can be unlocked quickly, but accidental knocks may cause unintended unlocking
Solution Approach 1:
The control device position is inverted from outer side to inner side of the crank. This inversion simultaneously achieves quick operation through the cam mechanism while improving reliability by protecting the control device from accidental knocks that would occur on the exposed outer side.
Solution Approach 2:
The control device is positioned on the inner side of the crank, which is protected from external forces. This preliminary positioning prevents accidental unlocking by shielding the control mechanism from kicks, bumps, and other external disturbances that could occur on the outer side.
3Ease of operation
If the fixing device extends to the outer side of the crank, then the locking mechanism is accessible, but it increases the transverse width of the bicycle
Solution Approach 1:
The fixing device is inverted from extending to the outer side to being contained within the inner side of the crank. This inversion reduces the bicycle's transverse width while maintaining operational accessibility through the cam and slot mechanism that works from the inner side position.
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 safer, more secure, and cost-effective pedal detachment system that reduces the transverse width of bicycles, facilitating easier storage and reducing material usage, while ensuring the fixing device is protected from external knocks and frictional forces.
Implementation Method 1
the lateral plate module includes one or more lateral plates; the one or more lateral plates are provided with a return spring
Implementation Method 2
the pedal shaft has a horizontal angle up to 25 degrees, the shaft will not slip off the hole. Twenty degrees is a maximum for common bicycles. That is, the pedal force component attempting to pull the pedal shaft out is less than the friction force between the pedal shaft and the inner wall of the hole
Data Source
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AI summary
The invention discloses a quickly detachable pedal device without instruments, which includes a pedal and a crank. A fixing device is mounted at non-outer side of the crank for fixing a solid pedal shaft. And the fixing device neither extends to the outer side of the crank nor includes any parts at the outer side of the crank simultaneously. The fixing device of the quickly detachable pedal device keeps away from the outer side of the crank completely, therefore feet or trouser legs of riders won't be hitched or rubbed, and the fixing device won't unclamp although accident knocks; the operation of the quickly detachable pedal device may be accomplished easily and quickly within 2 to 3 seconds without any instruments, and the fixing device has dependable performance. Transverse width of bicycle can be further reduced.