Handle Device Vibration Isolation via Nested Spring Elements
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Solution Overview
Problem
Existing hand tools, particularly heavy boring and impact hammers, face vibration limitations due to stringent legal standards, requiring innovative solutions to reduce vibration while maintaining ease of use and extending the tool's service life.
Innovation Solution
A handle device with a spring element and secondary elastomer spring elements, supported by an intermediate plate, which absorbs and distributes vibrations, allowing for precise guidance and ergonomic operation, while ensuring dust protection and efficient energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a handle with elastic connection is used to decouple vibrations, then vibration isolation is improved, but structural complexity increases
Solution Approach 1:
The isolating device is divided into multiple functional components: a first spring element for primary vibration isolation, and at least one secondary spring element for additional decoupling. This segmentation allows each spring element to perform its specific function independently, achieving effective vibration isolation while maintaining a manageable structural complexity through modular design
Solution Approach 2:
The secondary spring element is arranged within the housing and works in conjunction with the first spring element. The nested arrangement of spring elements within the handle structure allows for compact integration of multiple isolation mechanisms without significantly increasing the overall device complexity
2Device complexity
If rigid mounting is used for handle, then structural simplicity is improved, but vibration isolation deteriorates
Solution Approach 1:
The mounting parameters are changed from rigid to elastic by introducing spring elements. The first spring element and secondary spring element provide controlled elasticity that isolates vibrations while maintaining structural simplicity through the use of standard spring components that can be integrated into the existing handle design
3Object-affected harmful factors
If multiple spring elements are added for better vibration isolation, then vibration isolation is improved, but manufacturing cost increases
Solution Approach 1:
The spring elements are designed with optimized parameters including material selection, wire diameter, coil diameter, and number of turns. These parameter optimizations allow the first and secondary spring elements to achieve effective vibration isolation while controlling manufacturing costs through efficient material usage and standard component design
Solution Approach 2:
The spring elements are designed as cost-effective components that can be manufactured using economical processes. The use of standard spring designs and common materials keeps the manufacturing cost reasonable while providing the necessary vibration isolation performance
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 vibration, extends tool service life, and allows for easy assembly and cost-effective design, ensuring the handle device meets ergonomic and functional requirements for heavy craftsmanship.
Implementation Method 1
The isolating device includes a spring element by which the second end of the handle is supported against the housing in a vibration-isolated manner
Implementation Method 2
The spring element and at least one secondary spring element form a linear-elastic support
Implementation Method 3
at least one secondary spring element, which is arranged within the housing and which forms, together with the spring element, a linear-elastic support
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
The invention relates to a handle device for a hand-held power tool, which comprises an operating mode-switchover device and a drive device for driving an insert tool in different operating modes, with at least one spring element (18) and a handle unit (22) which is mounted on a machine housing (20) so as to be movable at least to a limited extent and which is at least partially decoupled in terms of vibrations via the at least one spring element (18) with respect to the machine housing (20). It is proposed that the handle device comprise at least one secondary spring element (34).