Bicycle Bottom Bracket Puller with Spring-Locked Guide Pin
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Solution Overview
Problem
Existing methods for releasing inner bearings from bicycle bottom brackets are inefficient and lack a reliable mechanism to securely engage and disengage the puller, leading to difficulties in removal and reinstallation.
Innovation Solution
A device comprising a guide pin, a sleeve-shaped puller with a driving profile and a locking mechanism, including a locking bolt with radial locking elements and a compression spring, which securely engages and disengages the inner bearing from the outer shell, allowing for easy removal and reinstallation by adjusting the locking mechanism's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a puller is used to detach the inner bearing from the bottom bracket, then the bearing can be removed, but the puller may accidentally disengage during the unscrewing process
Solution Approach 1:
The locking mechanism employs a compression spring to create a dynamic locking system that automatically engages and disengages based on the operational state. The spring-loaded design allows the locking element to move radially, providing automatic engagement during removal and secure locking during unscrewing, thereby preventing accidental disengagement while maintaining operational simplicity
Solution Approach 2:
The locking mechanism is designed to automatically engage and lock the puller to the inner bearing without requiring additional manual intervention. The compression spring self-actuates the locking element into the locking bore, creating a self-locking system that secures the engagement during the unscrewing process and only releases when intentionally actuated
2Reliability
If the puller is securely locked during unscrewing, then accidental disengagement is prevented, but the mechanism becomes more complex
Solution Approach 1:
The locking mechanism is segmented into distinct functional components: a compression spring for providing locking force, a locking element for engagement, and a locking bore for reception. This segmentation allows each component to perform its specific function efficiently, creating a reliable locking system while keeping the overall structure manageable and understandable
Solution Approach 2:
The locking mechanism is nested within the puller assembly, with the compression spring housed inside the puller body and the locking element moving within the locking bore. This nested arrangement consolidates multiple components into a compact integrated unit, reducing overall device complexity while maintaining the reliability of the locking function
3Reliability
If the locking element protrudes beyond the guide bolt surface, then engagement with the inner bearing is secured, but the guide bolt cannot be easily pulled off
Solution Approach 1:
The locking element is designed to be radially movable within the locking bore, transitioning between a protruding locked position and a retracted unlocked position. The compression spring provides the force for automatic engagement into the protruding position, while intentional actuation allows easy transition to the retracted position for disengagement, solving both security and ease of operation requirements
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 device ensures secure engagement and disengagement of the puller with the inner bearing, facilitating easy removal and reinstallation of the bottom bracket, with the compression spring maintaining engagement during unscrewing and preventing accidental disengagement.
Implementation Method 1
a compression spring arranged in the guide bolt, which biases the locking bolt towards its locking position
Implementation Method 2
a radial projection guided through the locking bore on a spring element arranged in the guide bolt, which is supported on the inside by the locking bolt in the locking position
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a device (1) for removing a bottom bracket (2) from a bottom bracket, wherein the device (1) comprises: - a guide pin (3) for insertion into an inner ring (4) of the bottom bracket (2), - a puller (5) with a sleeve-shaped section (6) in which the guide pin (3) is held, and a disc (10) adjoining the sleeve-shaped section (6), which is provided in the direction of the guide pin (3) with a drive profile (11) for engagement with a complementary profile in an outer shell (12) of the bottom bracket (2), - a locking mechanism configured to optionally secure a bottom bracket (2) engaged with the drive profile (11) against removal from the guide pin (3) in a locking position or to release it for removal in an unlocking position.