Tyre Changing Operating Head with Hooked Removal Tool
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Solution Overview
Problem
Existing tyre-changing machines struggle to correctly remove and fit all types of tyres, particularly motor vehicle tyres and soft tyres, due to design limitations that can cause damage and make extraction difficult.
Innovation Solution
An operating head with supporting means, a reference element, and a removal tool with a hook-shaped extremity that moves between fastening and extraction positions, and an additional disengagement position, allowing for reduced stress on the tyre bead and compatibility with conventional turret tools for special tyres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mobile tool is used to fit motor vehicle tyres, then the tool inserts itself between the rim edge and the tyre bead, but this causes damage to both the tyre and the rim due to the small width of such tyres
Solution Approach 1:
The tool is designed with movable components that allow it to adapt its position dynamically. The support element can be positioned at different locations, and the tool can move between fitting and extraction positions, enabling it to work effectively on narrow motor vehicle tyres without causing damage.
Solution Approach 2:
A support element is introduced as an intermediary component between the tool and the tyre bead. This support element can be positioned on the inner face of the tyre bead and provides a fulcrum for the tool, allowing extraction without the tool directly pressing against and potentially damaging the tyre bead or rim edge.
2Ease of operation
If the operating head presses on the side of soft tyres during movement to the fitting position, then the tyre side yields elastically, but the hooked end of the tool cannot be positioned below the tyre bead for extraction
Solution Approach 1:
The support element is positioned on the inner face of the tyre bead before the extraction operation begins. This preliminary positioning creates a stable fulcrum that prevents the tyre bead from yielding elastically during tool movement, ensuring the hooked end can be correctly positioned below the tyre bead for reliable extraction.
Solution Approach 2:
The support element acts as a mediator between the tool and the soft tyre bead. By providing a rigid support point, it prevents the tyre material from deforming under the tool's weight during movement, maintaining the geometric relationship needed for successful extraction.
3Reliability
If a traditional turret tool is used for soft tyres, then bead extraction is possible, but the operating head must be replaced before the tyre removing operation
Solution Approach 1:
The operating head is designed with a removable tool that can function in multiple modes. The same tool can be used for both standard tyre removal operations and for soft tyre extraction when the support element is engaged, eliminating the need to replace the entire operating head or tool assembly.
Solution Approach 2:
The tool is divided into separable components, with the support element and the hooked tool being distinct but complementary parts. This segmentation allows the support element to be positioned or removed independently, enabling the same tool assembly to handle different tyre types without complete replacement.
Data Source
AI summary
The operating head (1) for removing and fitting wheel tyres for vehicles comprises supporting means (2) associable with a tyre-changing machine (A), a reference element (4) associated with the supporting means (2) and positionable in the proximity of a section of the edge (F) of the rim (C) of a wheel (D) fixed on the tyre-changing machine (A), during the removal operation of a tyre (B) from the rim (C), a removal tool (3) having a free extremity (6) substantially hook-shaped, associated with the supporting means (2) and movable between a fastening position, wherein the tool (3) extends from the supporting means (2) beyond the reference element (4) to fit between the edge (F) of the rim (C) and the tyre (B) and to position the free extremity (6) below the bead (G) of the tyre (B), and an extraction position, wherein the free extremity (6) is arranged in correspondence to the reference element (4) to extract the bead (G) of the tyre (B) above the edge (F) of the rim (C), and positioning means (16) for positioning the tool (3) in a disengagement position, wherein the tool (3) is substantially moved away with respect to the reference element (4).