Quickly Detachable Bicycle Handlebar Stem with Anti-Theft Locking
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Solution Overview
Problem
Existing handlebar stem solutions are complex, costly, vulnerable to theft, and difficult to retrofit, often requiring multiple manipulations and specialized tools.
Innovation Solution
A stem set with a single-piece round steerer tube featuring a releasable clamping clip and clamping means, allowing for tool-free clamping and release, and a locking mechanism that prevents theft and unauthorized removal, enabling easy rotation and secure attachment to the steerer tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a special steering shaft is used to enable stem rotation and resetting, then the stem can be twisted and reset, but the solution becomes vulnerable to theft, requires several manipulations, and makes retrofitting costly and material-intensive
Solution Approach 1:
The invention divides the stem into separable components: a stem body and a detachable clamping clip assembly. The clamping clip can be independently removed from the steerer tube, allowing the stem to be detached without requiring a special steering shaft. This segmentation enables simple rotation and resetting operations while reducing overall system complexity and theft vulnerability.
Solution Approach 2:
The clamping clip is extracted as a separate, removable component from the traditional integrated stem design. This allows the clamping mechanism to be taken off the steerer tube independently, enabling the stem to be rotated or reset by simply removing and reattaching the clip, rather than requiring complex manipulations of a special steering shaft.
2Strength
If traditional clamping mechanisms are used, then the stem can be attached to the steerer tube, but extensive configure effort is required especially when retrofitting
Solution Approach 1:
The clamping clip is designed with a universal interface that fits standard round steerer tubes without requiring special adapters or configuration. The clip's geometry and clamping mechanism are standardized to work with common bicycle steerer tube dimensions, allowing easy retrofitting onto existing frames without extensive configure effort or custom manufacturing.
Solution Approach 2:
The clamping clip is designed as a simple, inexpensive component that can be easily manufactured and replaced. Its straightforward geometry and standard materials make it cost-effective to produce, and if needed, it can be quickly replaced without requiring expensive specialized parts or complex assembly procedures during retrofitting.
3Reliability
If existing stem solutions are used, then the stem can be mounted on the steerer tube, but they are complicated, expensive or unsafe, and particularly vulnerable to theft
Solution Approach 1:
The locking function is segmented into a separate, simple mechanism integrated with the clamping clip rather than being part of a complex overall system. The clip itself incorporates a straightforward locking feature that engages with the steerer tube, providing reliable attachment without requiring multiple separate locking components or complex assembly procedures.
Solution Approach 2:
The clamping clip incorporates self-aligning and self-locking features that automatically engage when the clip is positioned on the steerer tube. The geometry of the clip and its interaction with the steerer tube create automatic positioning and locking without requiring additional adjustment steps or complex mechanisms, thereby ensuring reliable mounting while keeping the device simple.
Data Source
AI summary
The invention relates to a handlebar stem, which permits simple and quick loosening and twisting, as well as simple and safe resetting and fastening of said stem with the handlebar attached thereto. The problem of the invention is to provide a particularly simple, theft-proof and versatile alternative involving low manufacturing costs, and which can also easily be retrofitted. A stem set according to the invention comprises a stem and at least one locking device, which can be fixedly clamped to the steerer tube. According to the invention, the stem set is arranged, such that when mounted on the steerer tube, the locking device fixedly connected to the steerer tube prevents the stem from being pulled off the steerer tube. However, this can also be achieved, for example, by the stem engaging around and/or behind the locking device and/or the locking device engaging around and/or behind the stem.