Tire Bead Demounting Device with Hook Extraction Mechanism
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Solution Overview
Problem
Existing tire demounting machines require manual intervention and significant physical force to complete the demounting of the second bead, risking damage to the rim or tire due to imprecise handling, and existing automatic solutions are complex and costly.
Innovation Solution
A demounting device with a support member, tool-holder arm, abutment element, and hook-like extraction member that allows for automatic demounting of the second bead by translating the abutment element to push the bead close to the rim edge and using a hook-like extraction member to grip and rotate the bead for complete removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a rotatable disc is used to push the second bead during demounting, then the bead can be pushed in the direction of the rotation axis, but manual intervention is still required and the operator must apply considerable physical force which risks damaging the rim or tire
Solution Approach 1:
The extraction member is designed to automatically engage with the second bead and complete the demounting operation without requiring manual intervention. The member self-positions and self-actuates to grip and rotate the bead, making the system self-sufficient for the complete demounting process.
Solution Approach 2:
The extraction member acts as an intermediary tool between the pusher element and the second bead. It receives the pushing force and translates it into a gripping and rotating action that safely removes the bead without requiring direct manual handling by the operator.
2Extent of automation
If existing automatic demounting devices are used, then manual intervention is eliminated, but the device complexity and cost increase significantly
Solution Approach 1:
The demounting device is segmented into distinct functional components: a pusher element for axial pushing and an extraction member for gripping and rotating. This segmentation allows each component to perform its specific function with simple, dedicated mechanics rather than requiring a complex integrated system.
Solution Approach 2:
Instead of using a complex mechanism to directly pull or lift the bead, the invention inverts the approach by pushing the bead axially and then using a simple hook-like extraction member to engage and rotate it. This inverted sequence of operations simplifies the overall device complexity while maintaining automatic operation.
3Force
If manual handling is used to complete the demounting of the second bead, then physical force can be applied, but the risk of ruining the rim or tire increases due to imprecise or incorrect handling
Solution Approach 1:
The extraction member serves as a protective intermediary that mediates between the operator's force application and the delicate tire-bead-rim assembly. It distributes and controls the forces applied during demounting, preventing concentrated loads that could damage the rim or tire while still providing sufficient force to complete the operation.
Solution Approach 2:
The extraction member automatically positions itself and engages with the bead in a controlled manner, eliminating the need for imprecise manual positioning. The self-servicing mechanism ensures forces are applied at the correct locations and angles, preventing damage to the rim and tire while maintaining the necessary force for demounting.
Data Source
AI summary
The present invention relates to a demounting device comprising a support member translatable along a movement axis (y-y), drive means for the support member, a tool-holder arm (3) borne by the support member (2), an abutment element (4) and a hook-like extraction member (5) both supported by the tool-holder arm (3), the abutment element (4) having a substantially flat work surface (4a), whereas the hook-like extraction member (5) is suitable for being moved in a substantially transverse direction with respect to the rotation axis (x-x) of a rim (W).