Inclined Pivot Handlebar Stem for Compact Bicycle Parking
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Solution Overview
Problem
Conventional handlebar stems cause the handlebars to rise when transitioning from a steering position to a parked position due to a vertically oriented pivot axis, making the bicycle less compact.
Innovation Solution
The handlebar stem features an inclined pivot axis relative to the longitudinal center axis of the shaft clamping unit, compensating for the steering angle and preventing handlebar rise, allowing for a more compact parked position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a vertically oriented pivot axis is used in the handlebar stem, then the handlebar stem structure is simple and conventional, but the handlebars rise when transitioning to the parked position, reducing the bicycle's compactness
Solution Approach 1:
The patent applies parameter changes by modifying the orientation of the pivot axis from vertical to inclined. The pivot axis is angled relative to the longitudinal center axis of the shaft clamping unit, which changes the geometric parameters of the pivoting mechanism. This inclination allows the handlebars to rotate in a path that prevents upward movement, thereby maintaining bicycle compactness while preserving the simplicity of the overall structure.
2Volume of moving object
If the handlebars are rotated 90° into a parking position for compact storage, then the bicycle becomes more compact, but the handlebars rise due to the steering angle and vertical pivot axis
Solution Approach 1:
The patent changes the orientation parameter of the pivot axis to compensate for the steering angle. By inclining the pivot axis relative to the longitudinal center axis of the shaft clamping unit, the rotation path of the handlebars is adjusted. This ensures that when the handlebars are rotated 90° into the parking position, they do not rise upward, thereby maintaining both compactness and proper handlebar shape/position.
3Volume of moving object
If an inclined pivot axis is implemented, then the handlebars remain lower in the parked position improving compactness, but the pivot axis is no longer vertical which deviates from conventional design
Solution Approach 1:
The patent implements parameter changes by specifying that the pivot axis is inclined relative to the longitudinal center axis of the shaft clamping unit. This angular parameter change is the core of the invention - it modifies the pivot axis orientation from the conventional vertical position to an inclined position, which directly enables the handlebars to remain lower in the parked position while maintaining a relatively simple structural implementation.
Data Source
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AI summary
The invention relates to a handlebar stem, particularly for a bicycle, comprising a stem clamp for attachment to the fork steerer tube and a handlebar clamp for attachment to the handlebars. The handlebar clamp is connected to the stem clamp via a pivoting mechanism, pivoting about a pivot axis extending between a steering position and a parked position. The pivot axis is inclined relative to the longitudinal center axis of the stem clamp bore in the direction of a handlebar mounting opening. The pivot axis is stationary and decoupled from an adjustment axis for adjusting the handlebar height. The inclination of the pivot axis is defined by the arrangement of bores in the handlebar clamp and a sleeve in the stem clamp. The invention further relates to a bicycle with such a handlebar stem and a method for moving the bicycle from a steering to a parked position.