Bicycle Handlebar Stem Single-Screw Adjustment
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Solution Overview
Problem
Existing handlebar stems for bicycles require lengthy processes for mounting and dismounting, involve multiple screws for assembly and disassembly, and necessitate replacing the entire stem to adjust the central extension length, which is time-consuming and costly.
Innovation Solution
A handlebar group with a central extension that can be adjusted by replacing only the central extension, utilizing a single tightening rod to secure both the front head and rear collar, thereby simplifying the mounting and dismounting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a full opening front head with removable cover is used to allow easy handlebar insertion, then the ease of operation is improved, but the mounting and dismounting time increases due to requiring four screws to be manoeuvred
Solution Approach 1:
The patent combines the front head and rear collar clamping mechanisms into a single integrated clamping system controlled by one screw. This merging of previously separate mechanisms (front head cover screws and rear collar screws) into a unified system allows simultaneous control of both clamps, reducing the number of operations required and eliminating the need to manoeuvre four separate screws.
Solution Approach 2:
The single screw mechanism serves multiple functions simultaneously: it controls both the front head clamp and the rear collar clamp, and it manages both the opening and closing actions of both clamps. This multi-functionality eliminates the need for separate control mechanisms for each clamp, thereby reducing mounting and dismounting time while maintaining ease of operation.
2Reliability
If the rear collar includes a clamping system with two screws for fixing the handlebar stem to the fork tube, then the reliability of fixation is improved, but the mounting and dismounting time increases
Solution Approach 1:
The patent merges the front head clamping mechanism and the rear collar clamping mechanism into a single integrated system controlled by one screw. This eliminates the need to separately manoeuvre two screws for the rear collar and two screws for the front head, reducing the total screw operations from four to one, thereby decreasing mounting and dismounting time while maintaining fixation reliability through the integrated design.
3Strength
If the entire handlebar stem must be replaced to change the central extension length, then the structural integrity is maintained, but the cost and time for adjustment increase
Solution Approach 1:
The patent segments the handlebar stem into modular components: the central extension can be independently removed and replaced without affecting the front head or rear collar assemblies. This segmentation allows the central extension to be changed as a separate component, reducing adjustment time and cost compared to replacing the entire stem, while the integrated clamping system ensures structural integrity is maintained through proper connection of all segments.
4Reliability
If four screws are used to fix the front cover to the front head, then the reliability of the connection is improved, but the complexity of the assembly increases
Solution Approach 1:
The patent combines the front head clamp and rear collar clamp into a single integrated clamping system controlled by one screw. This merging reduces the total number of screws from four (two for front head, two for rear collar) to one, thereby reducing assembly complexity. The integrated design maintains connection reliability through the unified clamping mechanism that secures both components simultaneously with a single fastening action.
Data Source
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AI summary
The present invention relates to a handlebar group (10) for bicycles comprising: - a handlebar (11); - a handlebar stem (14) comprising in turn: - a front head (15), with first fixing means (18) configured for locking the handlebar (11); - a rear collar (16), with second fixing means (19) for a tube of a fork; - a central extension (17), for connection between the front head (15) and the rear collar (16).