Bicycle Stem With Helical Quill for Compact Handlebar Maneuvering
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Solution Overview
Problem
Bicycle handlebars protruding from the frame create challenges in navigating tight spaces, parking, transporting, and storing, as they catch on objects and hinder maneuverability.
Innovation Solution
A bicycle stem design with a quill and base system that allows for rotation of the handlebars between ride and walk modes, using helical slots and a pin mechanism to secure the handlebars in parallel or perpendicular positions, enabling a compact profile for walking and a standard configuration for riding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the handlebars are positioned in a standard perpendicular configuration for riding, then steering control and riding stability are improved, but the bicycle footprint increases and maneuverability in tight spaces deteriorates
Solution Approach 1:
The patent implements a dynamic handlebar positioning system that allows the handlebars to be rotated between a perpendicular ride mode and a parallel walk mode. The quill mechanism with helical slots and pin enables the handlebars to change orientation dynamically, reducing the bicycle footprint when not in use while maintaining proper steering control during riding.
Solution Approach 2:
The stem assembly serves multiple functions: it provides structural support for the handlebars, enables rotation between ride and walk modes, and includes a clamping mechanism to secure the handlebars in position. This multi-functional design allows the same component to serve both riding and storage/maneuvering needs.
2Area of stationary object
If the handlebars are rotated to a parallel position for walking mode, then the bicycle footprint is reduced and maneuverability in tight spaces is improved, but steering control during riding deteriorates
Solution Approach 1:
The system allows dynamic switching between handlebar orientations. The helical slots and pin mechanism enable smooth rotation from parallel (walk mode) to perpendicular (ride mode) positioning, ensuring that steering control is restored when needed while achieving compact footprint when maneuvering through tight spaces.
Solution Approach 2:
The clamping mechanism is designed to secure the handlebars in the desired position before riding begins. By预先 securing the handlebars in the perpendicular position, the system ensures proper steering control is established before the riding action commences.
3Device complexity
If a fixed handlebar position is used, then structural simplicity is improved, but adaptability to different usage modes deteriorates
Solution Approach 1:
The stem incorporates a rotatable quill mechanism with helical slots that allows the handlebars to be positioned in multiple orientations (perpendicular for riding, parallel for walking). This dynamic positioning capability provides adaptability to different usage modes while maintaining relatively simple structural implementation.
Solution Approach 2:
The stem assembly is designed to serve multiple usage scenarios: it provides stable support for traditional perpendicular handlebar positioning during riding, and enables parallel positioning for compact storage and maneuvering. The same structural components handle both configurations without requiring separate systems.
Data Source
AI summary
A stem includes a quill with a quill length extending along an axis. A first quill end has a cradle configured to couple to a handlebar, and a second quill end has helical slots opposite one another. A base has a base length extending along the axis. The base is configured to receive the quill. A first base end has a bracket configured to couple to a steering mast. The base has apertures opposite one another, and a second base end has a groove extending along the axis. A pin is coupled to the base perpendicular to the axis through the apertures. A releasable clamp is sized to fit around a base outer diameter. The helical slots are configured to receive the pin and slidably guide the pin along the helical slots of the quill such that the quill is rotatable within the base and relative to the base.