Flexible Coupling Vibration Damping in Hand-Held Demolition Tool
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Solution Overview
Problem
Hand-held demolition tools experience significant vibratory movements during operation, leading to operator discomfort and potential health risks, as well as instability due to unsynchronized piston movements and inadequate damping, particularly with worn flexible couplings that can disrupt air supply.
Innovation Solution
The flexible coupling is redesigned to limit pivot action between the cylinder and handles, allowing only torsional movements around a specific axis, with vibration-damping elements and optimized mass distribution to absorb and filter out vibratory movements, ensuring the tool remains stable and easy to operate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible coupling is used to connect the cylinder to the handles, then the tool can accommodate piston movements and provide some vibration damping, but the flexible coupling allows excessive pivot action and torsional movements that transfer vibrations to the handles and disrupt air supply
Solution Approach 1:
The patent changes the parameters of the flexible coupling by specifying precise geometric constraints (pivot angle limits, torsional stiffness) and material properties to optimize the balance between vibration damping and air supply stability. The coupling is designed with controlled flexibility parameters rather than unrestricted flexibility.
Solution Approach 2:
The flexible coupling is designed with non-uniform properties: it allows pivot movement within specific angular limits while restricting torsional movements. The coupling has different stiffness characteristics in different directions and modes of deformation, providing localized damping where needed while maintaining stability where required.
2Ease of operation
If the forward handle is connected with a vibration-damped connection, then operator comfort is improved, but torsional movements are not adequately absorbed and are transferred to the handle
Solution Approach 1:
The patent introduces an intermediary vibration-damped connection between the forward handle and the cylinder/tube assembly. This intermediary element (such as a vibration isolator or damped mounting) is specifically designed to filter out torsional movements while allowing necessary piston-induced movements, thereby protecting the operator from harmful vibrations.
3Ease of operation
If the rubber tube in the flexible coupling is made more flexible to increase damping, then vibration absorption improves, but the tube bends excessively and prevents air supply to the cylinder
Solution Approach 1:
The patent optimizes the flexibility parameters of the rubber tube by selecting appropriate material composition, wall thickness, and diameter ratios. These parameter changes ensure the tube provides sufficient vibration damping while maintaining adequate rigidity to prevent excessive bending that would block air flow to the cylinder.
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 solution effectively reduces vibratory movements to acceptable levels, minimizing operator discomfort and tool instability, while preventing air supply disruptions, resulting in a more stable and efficient demolition process.
Implementation Method 1
The pivot action of the connection of the two legs of the forward handle is damped and limited as a result of the legs being connected to elastic torsion elements disposed between the two connections
Implementation Method 2
The rubber tube absorbs the vibratory movements by allowing small oblique displacements and torsional movements between the cylinder 2 and the tube 3
Data Source
AI summary
The invention relates to a hand-held demolition tool (1) comprising a cylinder (2), a rear handle (6) and a flexible coupling (4) for the flexible connection of the cylinder (2) and the rear handle (6). According to the invention, the flexibility of the coupling (4) is arranged such that it allows flexibility only in the property pivot action between the cylinder (2) and the rear handle (6) around a rigid theoretical axis (9).