Steering Limiting Device for Bicycles with Internal Projections
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Solution Overview
Problem
Existing steering limiting devices for bicycles are not compatible with all models, pose safety risks due to protruding projections, and negatively affect aerodynamic characteristics, especially on racing and sports bicycles.
Innovation Solution
A steering limiting device with a first part fixed to the handlebar-fork assembly and a second part fixed to the head tube, featuring radial stop projections and a reference projection that are integrated within the frame, allowing rotation around a common axis without external protrusions, thus enhancing safety and aerodynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a steering limiting device with external projections is used, then the steering limit function is achieved, but safety risks increase due to clothing entanglement and injury hazards
Solution Approach 1:
The patent applies nesting by placing the reference rod inside the head tube and the stop projections inside the handlebar stem, concealing all limiting components within the bicycle structure rather than having them protrude externally. This eliminates the safety hazards of external projections while maintaining the steering limit function.
Solution Approach 2:
The patent extracts the harmful external projections from the visible area by relocating them into the internal structure of the bicycle frame and handlebar assembly, keeping only necessary external interfaces for adjustment and operation.
2Reliability
If a steering limiting device with external projections is used, then the steering limit function is achieved, but aerodynamic characteristics deteriorate
Solution Approach 1:
All steering limiting components (reference rod, stop projections) are nested within the internal structure of the head tube and handlebar stem, eliminating external protrusions that would create aerodynamic drag on racing and sports bicycles.
3Ease of manufacture
If a steering limiting device requiring handlebar stem projection is used, then the device can be assembled, but compatibility with all bicycle models is reduced
Solution Approach 1:
The patent designs the steering limiting device to be universally compatible with different bicycle models by using the existing head tube and handlebar stem structures as mounting locations, eliminating the need for specific handlebar stem projections and expanding applicability across various bicycle types.
Data Source
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AI summary
The present invention concerns a steering limiting device (10) for bicycles and similar vehicles, comprising: a first part (11) configured to be fixed to a coupling portion of a handlebar-fork assembly of a bicycle, said first part (11) comprising a fixing portion (12) for fixing it to the coupling portion of a handlebar-fork assembly; said first part (11) comprises two radial stop projections; a second part (15) configured to be fixed to a head tube of a bicycle frame, wherein said second part (15) comprises a fixing portion (16) suited to be fixed to a head tube of a bicycle frame; said second part (15) comprises a reference projection (17) configured to be positioned between the radial stop projections of the first part (11). The first part (11) comprises a central supporting body (18) and an external shaped portion (20) on which the radial stop projections are defined; the fixing portion (12) of the first part (11) comprises an engagement portion (19) suited to be engaged in a corresponding seat of the handlebar-fork assembly. The second part (15) comprises an annular body (21) suited to be inserted in a tubular cavity of the head tube of a bicycle frame, said annular body (21) comprising the reference projection (17) which protrudes radially towards the inside of the annular body (21).