Flexible Cord Guide Device for Vibration Reduction
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Solution Overview
Problem
Conventional guide devices for hand-held soil compaction machines, such as vibrating plates, fail to adequately reduce operator exposure to vibrations, leading to health issues and are often costly and inflexible, with elastomers aging and double joints being insufficient in long-term vibration reduction.
Innovation Solution
A flexible guide device designed with sections that transmit only tensile forces, similar to a cord or chain, connected to the guide bracket of the soil compaction machine, allowing for reduced vibration transmission and easy adjustment, featuring a rigid handle and control means for improved ergonomics and steerability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional elastomers are installed as damping means between the guide device and the frame, then vibration transmission is reduced, but the elastomers undergo aging process leading to brittleness and fracture over time
Solution Approach 1:
The patent changes the material parameter from elastomers to flexible cords or chains, fundamentally altering the damping mechanism from viscoelastic deformation to geometric flexibility. This parameter change eliminates the aging-related brittleness issue while maintaining vibration reduction capability through the inherent flexibility of the cord or chain structure.
Solution Approach 2:
The flexible cord or chain guide device represents a simpler, more durable alternative to elastomers. While elastomers degrade over time, the cord or chain structure has no such material limitations and can be easily replaced if needed, embodying a more reliable long-term solution.
2Object-affected harmful factors
If double joints are used to convert vibrations into rotational movements, then vibration reduction is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the essential function of vibration reduction from complex double joint mechanisms and implements it through the simple geometric flexibility of a cord or chain. By removing unnecessary mechanical complexity and relying on the inherent properties of the flexible element, the solution achieves vibration reduction without the complexity of articulated joints.
Solution Approach 2:
The flexible cord or chain acts as a simple flexible element that inherently absorbs and dissipates vibration energy through its geometry, eliminating the need for complex rigid joint structures. This flexible element approach achieves the same vibration reduction function with minimal structural complexity.
3Object-affected harmful factors
If guide devices with multiple damping means and joints are used, then vibration reduction is improved, but the cost and complexity of the device increase
Solution Approach 1:
The guide device is segmented into simple modular components - flexible cords or chains connected to the guide bracket and handle. This segmentation allows for easy manufacturing and assembly, avoiding the need for complex integrated damping structures. Each segment can be independently produced and assembled, reducing overall manufacturing cost and complexity.
Solution Approach 2:
The patent employs simple, inexpensive flexible cords or chains as the core damping element, replacing expensive complex damping mechanisms. These simple elements are cost-effective to manufacture and replace, providing a economical solution for vibration reduction that does not require sophisticated materials or complex assembly processes.
4Ease of operation
If rigid guide devices are used for steering control, then steerability is improved, but vibration transmission to the operator increases
Solution Approach 1:
The patent introduces dynamic flexibility into the guide device through the use of flexible cords or chains that can adapt their geometry during operation. This dynamic behavior allows the guide device to maintain steering responsiveness while simultaneously absorbing and isolating vibration energy from the operator's hands.
Solution Approach 2:
The flexible cord or chain acts as an intermediary element between the rigid guide bracket and the handle. This intermediary flexible element transmits steering forces effectively while blocking the transmission of vibration forces, mediating between the need for rigid control and the need for vibration isolation.
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 flexible guide device significantly reduces operator exposure to vibrations, achieving acceleration values of less than 1 m/s^2 during straight running and less than 2.5 m/s^2 during steering, while being cost-effective and adaptable for various machines.
Implementation Method 1
The guide device (10) is designed only for the transmission of tensile forces
Implementation Method 2
The guide device according to the invention is flexible at least in sections, for example designed like a cord
Data Source
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AI summary
The invention relates to a vibration-reducing guide device for a hand-operated soil compaction machine, in particular a vibratory plate compactor, which is at least partially flexible. This significantly reduces the transmission of vibrations from the vibration exciters to the operator. Furthermore, the guide device according to the invention is inexpensive to manufacture and also easily suitable for retrofitting.