Bicycle Tire Lever Wing Geometry for Tight Rim Installation
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Solution Overview
Problem
Existing bicycle tire levers often struggle with efficiently installing and removing tires from wheel rims, especially when the tire is tightly fitted, as they can cause damage to the wheel rim due to concentrated pressure and require multiple levers for tight fits.
Innovation Solution
A tool with a wing and flange design, where the wing has a curved convex profile and a guiding ramp to ease tire installation and removal, and a flange for spreading force across a larger area to prevent rim damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a narrow tire lever is used to ease the tire over the wheel rim, then the tire can be installed or removed, but the concentrated pressure may damage the wheel rim and make it difficult to move the lever circumferentially
Solution Approach 1:
The tire lever is divided into distinct functional sections: a body portion for circumferential movement, a wing portion for engaging the tire bead, and a hook portion for leveraging against the rim. This segmentation allows each part to perform its specific function optimally while distributing forces appropriately.
Solution Approach 2:
The lever transitions from a traditional narrow, radially-oriented design to a broader design that engages the rim in a circumferential dimension. The wing extends laterally to engage the tire bead while the body moves circumferentially around the rim, changing the primary dimension of operation from radial to circumferential.
2Productivity
If a series of narrow tire levers are used to ease tightly fitted tires, then the tire can be installed or removed, but the process becomes more complex and time-consuming
Solution Approach 1:
The tool combines multiple functions into a single integrated device: the body provides structural support and circumferential movement capability, the wing engages and leverages the tire bead, and the hook provides additional leverage points. This merging eliminates the need to use multiple separate levers simultaneously.
Solution Approach 2:
The tire lever is designed to perform multiple functions: it can engage the tire bead at different positions around the rim, provide leveraging force through the wing and hook, and move circumferentially to progress around the entire rim. This multi-functionality allows a single tool to handle both installation and removal of tightly fitted tires efficiently.
3Force
If pressure is applied to a narrow tire lever to lift the tire bead, then the tire can be lifted away from the rim, but the pressure concentrates on a small area causing difficulty in moving the lever
Solution Approach 1:
The wing is positioned to engage the tire bead and gradually lift it away from the rim as the lever moves circumferentially. The guiding means on the body prepares the tire bead for engagement by the wing, and the ramped protuberance begins the lifting action before the main leveraging force is applied, distributing the force application over a sequence of movements rather than a single concentrated point.
Data Source
AI summary
A tool for installing a tire on a wheel rim comprises a body and a wing. The wing extends from an upper portion of the body to form an overhang over a side of the body, such that the side of the body and an underside of the wing from an open channel for receiving in use an outer peripheral portion of a wall of the wheel rim. The channel extends between a forward portion and a rearward portion of the body. The wing comprises a leading edge and an upper side which are arranged to engage in use with a side wall of the tire. The leading edge of the wing is swept toward the rearward portion of the body and the upper side of the wing is curved about an axis which extends substantially along the channel, to form a convex profile.