Vibration Decoupled Guidance Drawbar for Work Tools
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Solution Overview
Problem
Hand-arm vibrations from hand-held implements like vibrating plates and compaction rollers exceed safety limits, posing a risk to operators and requiring additional protective measures such as limiting working hours.
Innovation Solution
A hand-held working device with a vibration decoupling system that isolates the drawbar section from the working device using elastic elements like rubber buffers and spring-damper devices, allowing the handle areas to be positioned centrally relative to the torsion axis, reducing hand-arm vibrations and improving ergonomics and operator protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid connection is used between the drawbar section and the working device, then control precision and structural stability are improved, but hand-arm vibrations exceed safety limits
Solution Approach 1:
The patent introduces a vibration decoupling device as an intermediary element between the drawbar section and the working device. This device includes elastic connecting elements that mechanically couple the two components while filtering out harmful vibrations, allowing control forces to be transmitted effectively while protecting the operator from excessive hand-arm vibrations
2Object-affected harmful factors
If a vibration decoupling device with elastic connecting elements is used, then hand-arm vibrations are reduced, but control precision and steering responsiveness deteriorate
Solution Approach 1:
The patent optimizes the parameters of the elastic connecting elements, specifically selecting stiffness values that fall within a defined range. This parameter optimization ensures that the elements are sufficiently compliant to reduce vibrations while maintaining sufficient rigidity to transmit steering forces effectively, thus preserving control precision
3Device complexity
If the torsion axis is positioned away from the center between the handle areas, then structural simplicity is improved, but ergonomics and operator comfort deteriorate
Solution Approach 1:
The patent deliberately positions the torsion axis of the vibration decoupling device to run essentially centrally between the first and second handle areas, creating a symmetric arrangement that optimizes ergonomics. This central positioning allows the operator to apply steering forces naturally with both hands while maintaining effective control, despite the inherent asymmetry in the overall drawbar structure
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 vibration decoupling system effectively reduces hand-arm vibrations, enhancing operator safety and comfort while maintaining precise control over the implement, thus avoiding the need for restrictive working hour limitations.
Implementation Method 1
The vibration decoupling device has elastic connecting elements, such as rubber buffers, which are arranged between the working device and the drawbar section
Implementation Method 2
the oscillations and vibrations generated at the working device can be dampened by the vibration isolating device
Implementation Method 3
Further vibration decoupling elements such as spring-damper devices can be provided and arranged between the working device and the drawbar section
Data Source
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AI summary
A hand-held work device comprises a working device (1) and a drawbar device (1) coupled to the working device (1) for guiding the working device. The drawbar device has a drawbar section (6) coupled to the working device (1) by a vibration decoupling device (9) and a handle device (7) arranged on the drawbar section (6) with a first handle area (7a) and a second handle area (7b). The first and second handle areas (7a, 7b) are arranged such that a torsional axis (10) of the drawbar section (6) caused by the vibration decoupling device (9) runs substantially midway between the first handle area (7a) and the second handle area (7b) relative to the working device (1).