Bicycle Twist Grip Shifter with Ball Bearings and Snap Connection
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Solution Overview
Problem
Existing twist grip shifters for bicycles require additional assembly steps and components, such as separate fixed grip parts, which complicate manufacturing and handling, and may lead to unintentional shifting due to friction issues.
Innovation Solution
An integrated twist grip shifter design where the bearing tube and fixed grip part are securely connected but can be assembled and disassembled individually, featuring a snap connection mechanism and ball bearings to minimize friction, allowing for a secure fit on handlebars without additional assembly steps and offering variants with or without a separate fixed grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bearing tube and fixed grip part are connected in one piece, then safety is improved by preventing unintentional shifting, but manufacturing complexity increases due to requirements for larger injection molding machines
Solution Approach 1:
The fixed grip part is separated from the bearing tube, allowing each component to be manufactured independently using standard injection molding machines. The separation enables safer assembly where the fixed grip part can be securely attached to the bearing tube, preventing unintentional shifting while avoiding the need for large-capacity molding equipment.
2Ease of manufacture
If the bearing tube and fixed grip part are separated into individual components, then manufacturing is simplified, but assembly complexity increases requiring additional work steps
Solution Approach 1:
The fixed grip part and bearing tube are designed with complementary geometric features that enable direct assembly without additional fastening components. The bearing tube includes an outer peripheral surface that fits into a corresponding recess in the fixed grip part, creating a unified structure through simple geometric interlocking rather than requiring separate assembly steps.
3Ease of operation
If friction is reduced between the rotary handle and fixed grip part, then operation smoothness is improved, but the grip may slip off the handlebars
Solution Approach 1:
The bearing tube is designed with differentiated surface characteristics: the outer peripheral surface that interfaces with the fixed grip part has high friction properties to prevent slipping, while the inner peripheral surface that contacts the rotary handle has low friction properties to enable smooth rotation. This local differentiation of surface quality resolves the contradiction between grip security and operational smoothness.
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 integrated design simplifies manufacturing, reduces friction during operation, and enhances safety by eliminating unintentional shifting, while allowing for easy assembly and disassembly, thus improving user experience and production efficiency.
Implementation Method 1
The arrangement of ball bearings between the bearing tube and the rotary handle in the axial area where the spool for winding the cable to be actuated is located is a measure to minimize friction.
Data Source
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AI summary
The invention relates to a bicycle twist grip shifter that is connected to a fixed grip and mounted as a unit on the handlebar tube. This also securely fixes the fixed grip to the handlebar tube. Furthermore, the individual components are sized for injection molding. The twist grip shifter provides the user with precise operation by eliminating disruptive friction between the twist grip and the bearing tube. This is achieved through the use of ball bearings for the winding spool and the use of a metallic positioning ring in the positioning mechanism.