Pneumatic Tire Bead Unseating Device with Parallelogram Linkage
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Solution Overview
Problem
Existing methods for detaching tires from rims are physically demanding, risk injury, and often damage the rims due to the adherence of tire beads over time, necessitating a more efficient and safer solution.
Innovation Solution
A device comprising facing tire-engaging members that move relative to each other to engage the tire sidewalls and detach the tire beads from the rim, utilizing a pneumatic cylinder and lever system to apply controlled force for efficient separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sledgehammer is used to detach tire beads from rims, then the tire can be removed, but the rims are damaged and there is a high risk of injuries
Solution Approach 1:
The patent introduces a specialized device as an intermediary between the operator and the tire-rim assembly. This device includes engaging members that contact the tire bead and a lever arm system that amplifies force while controlling its application point, thereby removing the tire without direct harmful impact to the rim or operator
Solution Approach 2:
The patent replaces the crude mechanical system of direct hammering with a refined mechanical system using lever arms, fulcrums, and engaging members. This substitution transforms the uncontrolled impact force into controlled, amplified mechanical force applied at optimal points on the tire bead
2Ease of operation
If hook-based systems are used to separate tire bead from rim, then the tire can be detached, but the system requires complex sliding mechanisms
Solution Approach 1:
The patent extracts the essential function of bead engagement from complex sliding mechanisms. The engaging members are designed to directly contact and grip the tire bead without requiring intricate sliding paths or multiple moving components, simplifying the overall device structure
Solution Approach 2:
Instead of using hooks that slide into the bead from the inside, the patent employs engaging members that contact the bead from the outside and lever it outward. This inverted approach achieves the same detachment function with simpler geometry and fewer moving parts
3Productivity
If bead breaker systems are used with a jaw pushed on the tire sidewall, then the tire bead can be detached, but the method lacks controlled force application
Solution Approach 1:
The patent incorporates a dynamic force application system where the lever arm can be positioned at different points along its length, and the engaging members can be adjusted to contact different locations on the tire bead. This allows operators to control the magnitude and direction of applied force based on specific tire and rim conditions
Solution Approach 2:
The device allows preliminary positioning of the engaging members and lever arm before force application. Operators can first establish proper contact points and leverage ratios, then gradually apply force, providing controlled detachment rather than sudden impact
Data Source
AI summary
A device for unseating tire beads of a tire from a rim comprises facing mobile upper and fixed lower jaws adapted to receive the tire horizontally therebetween. The upper jaw is mounted to a pivotable parallelogram linkage which is displaced by a pneumatic cylinder, whereby the actuation of the cylinder displaces the linkage which drives the upper jaw downwardly onto the upper sidewall of the tire, adjacent the rim, with the lower sidewall of the tire being engaged by the lower jaw. The upper and lower jaws are substantially vertical and plane plates. An adjustable tire abutment is provided for positioning the tire within the device such that the upper and lower jaws face respective sidewalls of the tire adjacent the rim. Another device is adapted to vertically receive the tire between the jaws thereof, so as to be unseated from the rim in a vertical position.