Height-Adjustable Bicycle Repair Stand With Perpendicular Gears
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Solution Overview
Problem
Existing bicycle repair stands, particularly those for heavier bicycles like electric assisted bicycles, are prone to structural complications and malfunctions due to their complex designs, leading to a risk of rapid descent when under heavy load.
Innovation Solution
A bicycle repair stand with a simplified structure featuring a lower support, first and second rotating sets, and an upper support, utilizing gears with perpendicular axes to prevent improper descent, where the first gear rotates the second gear coaxially, and the upper support ascends or descends relative to the lower support via a gear rack engaged with the third gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex lifting device with anti-rotation elements is used to prevent rapid descent, then the safety against rapid descent is improved, but the device complexity increases and malfunctions become more prone
Solution Approach 1:
The patent extracts and eliminates the complex anti-rotation elements from the lifting device. Instead of using multiple anti-rotation mechanisms, the invention uses a simple gear rack and pinion system where the gear rack's geometry inherently prevents rotation, achieving the same safety function with much simpler structure.
Solution Approach 2:
The patent replaces complex mechanical anti-rotation elements with a gear-based mechanical transmission system. The gear rack and pinion mechanism provides both lifting functionality and rotation prevention through the inherent characteristics of the gear engagement, substituting complex mechanical locks with a more reliable gear-based system.
2Device complexity
If a simplified structure is used to reduce complexity, then the device complexity is reduced, but the ability to prevent rapid descent under heavy load deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the gear rack to optimize its performance. By carefully designing the tooth profile and dimensions of the gear rack, the system achieves both structural simplicity and reliable prevention of rapid descent under heavy loads through proper parameter selection.
Solution Approach 2:
The patent utilizes the curved geometry of the gear rack teeth to achieve rotation prevention. The specific curvature and shaping of the gear rack teeth create a mechanical interlock that prevents rotation while maintaining lifting functionality, achieving reliable performance with simple structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The perpendicular gear axes configuration simplifies the structure and prevents the stand from descending due to heavy loads, ensuring stability and reliability.
Implementation Method 1
The first gear rotates along with the third pivot portion. The second gear is rotated by the first gear. The third gear and the second gear rotate coaxially and synchronously. The axes of the first gear and the second gear are perpendicular to each other.
Implementation Method 2
The upper support has a gear rack. The gear rack is engaged with the third gear, and the rotation of the third gear drives the upper support to ascend and descend relative to the lower support.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A bicycle repair stand adjustable in height includes a lower support (1), a first rotating set (4), a second rotating set (5), and an upper support (7). The lower support (1) has a first pivot portion (P1) and a second pivot portion (P2). The first rotating set (4) has a third pivot portion (P3) and a first gear (41). The third pivot portion (P3) is pivotably connected with the first pivot portion (P1). The first gear (41) rotates along with the third pivot portion (P3). The second rotating set (5) has a fourth pivot portion (P4) and a second gear (51). The fourth pivot portion (P4) is pivotably connected with the second pivot portion (P2). The second gear (51) is rotated by the first gear (41). The axes of the first gear (41) and the second gear (51) are perpendicular to each other. The upper support (7) has a gear rack (73). The gear rack (73) is engaged with the second gear (51), and the rotation of the second gear (51) drives the upper support (7) to ascend and descend relative to the lower support (1). The axes of the gears being perpendicular to each other makes the gear rack (73) uneasy to rotate the gears, so as to attain to simplified structure and avoid the situation of descending due to a heavy load, solving the conventional structure's problem of complication or being prone to malfunction.