Handlebar Stem with External Cable Routing
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Solution Overview
Problem
Existing handlebar stem solutions for integrated guidance of gear and brake cables are often incompatible with mechanical cables, require complex assembly, and involve laborious disassembly and reassembly of cables during stem exchange, leading to increased assembly outlay and reduced stability.
Innovation Solution
A handlebar stem core with a rear-side steer tube receptacle and front-side handlebar receptacle, featuring a handlebar stem tube with integrated cable guidance through open cutouts such as grooves and through-holes, allowing direct insertion of cable central sections without disassembling cable ends, enabling easy exchange and alignment of cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cables are threaded through the handlebar stem during assembly, then integrated cable guidance is achieved, but assembly outlay increases and cable ends must be disassembled and reassembled
Solution Approach 1:
The patent extracts the cable guidance function from the internal structure of the handlebar stem and relocates it to the external surface. Open cutouts are provided on the outer surface of the handlebar stem, allowing cables to be guided along the exterior rather than being threaded through the interior. This eliminates the need to disassemble cable ends while achieving integrated cable guidance, thereby reducing assembly complexity.
2Reliability
If cables are threaded through the handlebar stem, then integrated guidance is achieved, but assembly time increases due to laborious cable disassembly and reassembly
Solution Approach 1:
The cable guidance path is extracted from the internal routing requiring cable disassembly and relocated to external open cutouts on the handlebar stem surface. This allows cables to be routed externally without needing to be threaded through the stem interior, eliminating the time-consuming steps of disassembling and reassembling cable ends while maintaining integrated guidance appearance.
3Reliability
If the handlebar stem is of complex multi-part construction to accommodate cable guidance, then integrated cable guidance is achieved, but system stability decreases
Solution Approach 1:
The cable guidance functionality is extracted from the internal structural components of the handlebar stem and implemented as surface features (open cutouts) on an otherwise simple, stable handlebar stem design. This approach maintains the structural integrity and stability of the handlebar stem while providing integrated cable guidance through external routing paths.
Data Source
AI summary
A handlebar stem core (1) for a handlebar stem of a bicycle comprises a rear-side steer tube receptacle (1a), a front-side handlebar receptacle (1c), and a handlebar stem tube (1b) lying in between. The handlebar stem core is formed for the integrated guidance of a number n of cables (5), with n equal to 1, 2, 3, 4 or greater, and the handlebar stem core is configured for attachment to a cable central section of the number n of cables. The solution allows for guiding mechanical, hydraulic or else electrical brake and gear cables or lines proceeding from the respective operating elements at the handlebar or the handlebar ends to the bicycle frame or the head tube and/or the bicycle fork in a manner concealed from the outside with a low assembly outlay.