Bicycle Wheel Quick Release Cam Mechanism
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Solution Overview
Problem
Existing bicycle wheel quick release systems require two hands to operate and limit the rider's orientation during wheel servicing, making it inconvenient and potentially difficult to remove and reinstall wheels without tools, especially in challenging conditions.
Innovation Solution
A bicycle wheel quick release assembly featuring a cam surface and profile on a rotatable handle that allows single-handed operation by altering the distance between head portions, providing a tactile indication of orientation and redundant retention, enabling secure locking and easy removal of the wheel without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant retention system is added to prevent unintended wheel removal, then wheel security is improved, but the device complexity and operational difficulty increase
Solution Approach 1:
The patent combines the primary retention function (skewer holding the wheel) and the secondary retention function (lever-actuated cam mechanism) into a single integrated assembly. The cam mechanism is mounted on the skewer and works in conjunction with the dropout, creating a unified retention system that provides both security levels without requiring separate independent mechanisms.
Solution Approach 2:
The lever-actuated cam mechanism serves multiple functions: it provides the secondary retention lock, enables quick release when activated, and offers tactile feedback through its cam profile. This multi-functional design consolidates several purposes into a single component system, reducing overall complexity while maintaining reliability.
2Ease of operation
If a lever-actuated release mechanism is used to enable tool-less operation, then ease of operation is improved, but the risk of unintentional loosening due to vibration or contact increases
Solution Approach 1:
The cam mechanism is designed with a cam profile that creates increasing mechanical resistance as the lever rotates toward the release position. The cam surface geometry ensures that the lever cannot accidentally rotate backward to loosen the wheel, as the cam profile physically blocks such motion. The system preemptively prevents unintended loosening through its geometric design rather than relying on operator caution.
3Reliability
If concurrent manipulation of multiple retention components is required for wheel removal, then wheel security is improved, but ease of operation deteriorates
Solution Approach 1:
The skewer is pre-installed through the wheel hub and dropout, establishing the primary retention connection before the lever mechanism is engaged. The cam-follower relationship is pre-configured so that a single lever rotation automatically executes both the disengagement of the primary retention and the release of the secondary retention, eliminating the need for sequential manual manipulation of multiple components.
4Ease of operation
If the rider must be radially aligned with the wheel assembly for two-handed operation, then operational control is improved, but adaptability to different rider orientations deteriorates
Solution Approach 1:
The retention system is segmented into a fixed skewer component and a rotatable lever component. The lever can be operated from various angular positions around the skewer axis, allowing the rider to access the release mechanism from different orientations. This segmentation enables the same retention function to be controlled from multiple directional approaches, increasing adaptability to different rider positions.
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
Enables single-handed operation for quick release and reinstallation of bicycle wheels, enhancing convenience and flexibility during servicing, while maintaining secure engagement with the bicycle frame to prevent unintended disengagement.
Implementation Method 1
A cam surface is formed in the first head portion. A cam profile is formed on a portion of a shaft that extends from a handle. The cam profile is configured to cooperate with the cam surface such that the shaft is rotatable between a first position and a second position.
Data Source
AI summary
A quick release assembly for a bicycle wheel that includes a pair of heads disposed at generally opposite ends of a skewer rod. One of the heads includes a cam surface that is translatable relative to the head. The quick release includes an operator having a handle portion and a stem portion. The stem portion includes a cam that cooperates with the cam surface formed in one of the heads such that operation of the handle alters the distance between the heads from a first orientation wherein the heads secure a wheel to a bicycle, a second orientation wherein the heads loosely secure the wheel to the bicycle and a third orientation wherein the wheel assembly can be freely removed from the bicycle.