Multi-Stage Decoupling Device for Handheld Hammer Drill Vibration
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Solution Overview
Problem
Existing power tools fail to provide reliable vibration and oscillation decoupling when using an additional handle, leading to user fatigue during extended operations, especially in applications requiring increased force like corner drilling.
Innovation Solution
A multi-stage decoupling device with a vibration absorber is strategically placed between the main handle and the housing, featuring separate spring systems that engage differently based on the operating position, providing enhanced damping in the transition area between the handle and drive arrangement, allowing for effective vibration reduction and improved ergonomics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage decoupling device is used, then the structure is simple, but it cannot provide sufficient vibration damping when increased force is applied in compressor position
Solution Approach 1:
The decoupling device is divided into multiple stages with different spring elements (first spring element, second spring element, third spring element) that engage sequentially based on the operating position and force applied. Each stage provides appropriate damping for its specific load condition, resolving the contradiction between structural simplicity and damping reliability.
Solution Approach 2:
The decoupling device transitions from a static single-stage structure to a dynamic multi-stage structure where spring elements are selectively engaged based on operational conditions. The guide structure enables the second spring element to engage only in compressor position, allowing the system to adapt its damping characteristics to the applied load.
2Ease of operation
If the decoupling device is arranged in the transition area between main handle and housing, then corner drilling capability is improved, but vibration damping for additional handle is insufficient
Solution Approach 1:
The decoupling device combines multiple damping functions into a single integrated structure located in the transition area. By incorporating multiple spring elements and a guide structure, it simultaneously provides damping for the main handle and additional handle while maintaining the compact positioning needed for corner drilling operations.
3Reliability
If multi-stage spring elements are engaged, then vibration damping is enhanced, but the device length increases
Solution Approach 1:
The multi-stage spring elements are arranged in a nested configuration where the second spring element is positioned to engage only when the first spring element is fully compressed. This nested arrangement allows multiple damping stages to be incorporated within a compact space, enhancing vibration damping without significantly increasing device length.
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 enables longer operation without fatigue by effectively dampening vibrations, enhancing corner drilling capabilities, and allowing for easy assembly and retrofitting, while maintaining a compact design.
Implementation Method 1
a first spring element and a second spring element, each serving to support the main handle elastically
Implementation Method 2
a vibration absorber (15) is provided in the machine housing (10)... the weight reciprocates along the tool drive axis against the biasing force of the elastic member when the machine is actuated. By reciprocating the weight, the dynamic vibration reducer reduces vibrations generated in the body
Implementation Method 3
at least one elastic element, the elastic element being arranged between the weight and the housing and serving to exert a prestressing force on the weight
Implementation Method 4
Both the decoupling device and possibly a vibration absorber are preferably arranged in the transition area between the main handle and the drive arrangement or housing. As a result, the area in which the device is guided is significantly dampened with regard to oscillations and vibrations
Data Source
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AI summary
The tool has a drive arrangement (11) arranged in a housing (10) and provided for driving a tool holder around a drive axis. A main handle (13) is arranged at an end turned away from the holder and extends transverse to the drive axis. A decoupling device (14) is provided for partial vibration- and oscillation decoupling of the handle from the drive arrangement. A retainer attaches an additional handle (23) to the main handle, where the additional handle is decoupled by the decoupling device. The decoupling device and a vibration damper are accommodated in a damping unit.