Bicycle Shifter Cover Mechanism for Finger Grip Stability
Solution Overview
Problem
Existing human-powered vehicle operating devices lack effective mechanisms to restrict the operating member from moving in unintended directions, leading to instability and difficulty in transitioning between rest and operated positions, especially when force is applied by the rider's hand.
Innovation Solution
The operating device features a base member with a cover portion that is pivotally coupled to the operating member, allowing the rider's hand to apply force to the cover portion to move the operating member from a rest to an operated position, with a curved shape to facilitate finger grip and stability, and materials like glass fiber reinforced and carbon fiber reinforced materials for improved strength and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operating member is pivotally coupled to the base member without a cover portion, then the structure is simpler, but the operating member cannot be restricted from receiving force in the opposite direction from the rest position
Solution Approach 1:
The cover portion acts as an intermediary element between the rider's hand and the operating member. It transmits the operating force while preventing unintended forces from reaching the operating member, thus stabilizing the operating member without requiring complex restriction mechanisms.
Solution Approach 2:
The cover portion extends in the longitudinal direction of the base member, creating a new dimensional barrier that overlaps with the outer surface of the operating member. This longitudinal arrangement restricts the operating member from receiving force in the opposite direction while maintaining a relatively simple structure.
2Ease of operation
If the cover portion has a curved shape, then it is easier to grasp with the rider's finger, but the manufacturing complexity increases
Solution Approach 1:
The cover portion is designed with a curved shape that conforms to the natural curvature of the rider's finger. This curvature facilitates easy grasping and operation, making the device more user-friendly despite the slightly increased manufacturing complexity compared to a flat design.
3Ease of operation
If the curved shape of the cover portion is concave toward the first end portion, then it fits better for the rider's finger, but the structural complexity increases
Solution Approach 1:
The cover portion features a localized concave curvature specifically at the region that contacts the rider's finger, while other portions of the base member maintain simpler geometries. This localized application of complexity optimizes finger fit without unnecessarily complicating the entire device structure.
Data Source
AI summary
An operating device for a human-powered vehicle comprises a base member and an operating member. The base member extends in a longitudinal direction. The base member includes a first end portion and a second end portion. The second end portion includes a cover portion provided on a reverse side of the first end portion in the longitudinal direction. The operating member includes an outer surface configured to face away from the first end portion in a rest state where the operating member is in a rest position. The cover portion is configured to be arranged on a pivotal movement track of the operating member so as to at least partly overlap with the outer surface of the operating member in the rest state as viewed in the longitudinal direction.