Bicycle Shift Lever Positioning for Ergonomic Handlebar Integration
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Solution Overview
Problem
Existing bicycle shift operating devices often have the shift operating lever in the way of a rider's hand, compromising ergonomics and ease of use, especially when using control cables for gear shifting and braking.
Innovation Solution
A bicycle shift operating device design featuring a base member with a shift unit and two pivotally mounted levers, where the connecting member transmits movement from the operating lever to the shift unit, allowing the lever to be positioned out of the way of the rider's hand, enabling efficient gear shifting without interfering with the braking operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shift operating lever is positioned within easy reach of the rider's hand, then ease of operation is improved, but it interferes with the rider's hand gripping the handlebar and compromises ergonomics
Solution Approach 1:
The shift operating lever is repositioned from a location within the rider's hand reach zone to a location on the opposite side of the handlebar, utilizing the spatial dimension around the rider's hand rather than within it. This dimensional relocation allows the lever to remain accessible while eliminating interference with the gripping function.
Solution Approach 2:
The brake lever serves as an intermediary element that transmits the rider's hand movement to operate the shift cable. By using the brake lever as a mediator, the system eliminates the need for a separate shift lever within the hand's direct path, while still achieving shift operation through the interconnected cable mechanism.
2Adaptability or versatility
If a separate shift operating lever is provided, then gear shifting functionality is improved, but device complexity increases
Solution Approach 1:
The brake lever is designed to serve dual functions: braking operation and shift operation. By making the brake lever universal, the system achieves gear shifting capability without adding a separate dedicated shift lever, thereby maintaining simplicity while enhancing functionality.
Solution Approach 2:
The shift operating mechanism is merged with the existing brake lever structure and cable system. The brake lever and shift cable are interconnected such that movement of the brake lever simultaneously activates the shift mechanism, combining two functions into a single operational element.
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
This design enhances ergonomics by keeping the shift operating lever out of the rider's hand path, improving ease of use and reducing operational complexity while maintaining effective gear shifting and braking functionality.
Implementation Method 1
The connecting member includes a lever contact portion that contacts the first operating lever to transmit movement of the first operating lever to the connecting member in response to pivotal movement of the first operating lever about the second pivot axis.
Data Source
AI summary
A bicycle shift operating device is basically provided with a base member, a shift unit, an operating lever and a connecting member. The shift unit is disposed in the base member between first and second ends of the base member. The operating lever is pivotally mounted relative to the base member about first and second pivot axes. The connecting member operatively connects the shift unit to the first operating lever. The connecting member includes a lever contact portion that contacts the operating lever to transmit movement of the operating lever to the connecting member in response to pivotal movement of the operating lever about the second pivot axis. The connecting member is arranged such that the contact portion passes through a space provided between the first pivot axis and the first operating lever from the top surface side with respect to the first pivot axis.