Bicycle Stem Integrating Power Storage via Nested Apertures
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Solution Overview
Problem
The limited power availability in bicycle-mounted devices, such as lights and navigation tools, restricts their functionality and operational time due to battery drain, especially when using smartphones for navigation.
Innovation Solution
A bicycle stem with an integrated power storage device and electrical connectors, allowing for secure and accessible power supply through a second aperture, enabling the attachment of a handlebar without compromising the stem's strength, and providing USB connectors for charging and powering external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a power storage device is integrated into the bicycle stem, then the operational time of bicycle-mounted devices is extended, but the structural integrity of the stem may be compromised
Solution Approach 1:
The power storage device is nested within the hollow interior cavity of the stem body, utilizing the existing internal space. This allows the battery to be housed inside the stem structure without adding external components that would compromise structural integrity, while still providing extended power supply for bicycle-mounted devices.
Solution Approach 2:
The stem body serves multiple functions: it provides structural support for the bicycle, houses the power storage device, and contains electrical connection systems. This multi-functionality allows the stem to accommodate the battery while maintaining its primary structural role, thus preserving strength while enabling extended operational time.
2Ease of operation
If apertures are created in the stem body for electrical connections and device access, then power supply and device installation are enabled, but the strength of the stem is reduced
Solution Approach 1:
The apertures are strategically positioned in specific locations on the stem body - the first aperture on the forward-facing surface for electrical connections and the second aperture on the rear surface for device access. This localized placement minimizes the impact on overall structural strength while providing necessary access points for power supply and device installation.
Solution Approach 2:
The stem body is segmented with multiple separate apertures for different functions: one aperture for electrical connections and another for device access. This segmentation allows each opening to be optimized for its specific purpose while distributing the structural impact across multiple small openings rather than one large opening, preserving overall strength.
3Ease of operation
If the second aperture is positioned to allow handlebar attachment, then device installation is facilitated, but the aperture location must be carefully chosen to maintain stem strength
Solution Approach 1:
The second aperture is positioned on the rear surface of the stem body, perpendicular to the direction of handlebar attachment. This dimensional arrangement allows the aperture to be located in a position that does not interfere with the primary load-bearing path of the stem, maintaining strength while facilitating easy device installation through the aperture.
Data Source
AI summary
A stem for a bicycle comprises a body (14), an electrical device such as a power storage means (20), and a connecting means (24, 26). The body (14) has first and second apertures therein. The electrical device is located within the body. The connecting means enables electrical connection through the at least one first aperture, to enable supply of power to the device. The second aperture enables insertion of the device into the body and removal therefrom. A handlebar can be attached to the stem over the second aperture.