Hand Tool Absorber with Switching Spring Mechanism
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Solution Overview
Problem
Hand machine tools, such as hammer drills, face challenges in effectively managing vibrations and resonant frequencies during operation, leading to reduced precision and increased user fatigue due to inadequate absorption mechanisms.
Innovation Solution
The implementation of an absorber system with a body of mass and dual springs, where the movement of coupling elements relative to the case is controlled by a switching device, allowing the springs to act in series or parallel, and utilizing stop faces for directional movement, thereby adjusting the resonant frequency and absorbing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple absorber mechanism is used, then the device complexity is reduced, but the ability to manage vibrations and resonant frequencies is insufficient
Solution Approach 1:
The absorber mechanism incorporates a switching device that dynamically changes the configuration of spring elements between series and parallel arrangements, allowing the system to adapt its mechanical properties in real-time to manage vibrations and resonant frequencies effectively
Solution Approach 2:
The system changes the effective spring constant and damping characteristics by switching between different spring configurations, thereby adjusting the resonant frequency and absorption capacity of the absorber mechanism to match varying operational conditions
2Reliability
If dual springs acting in series are used, then the absorption of vibrations is improved, but the device complexity increases due to the switching mechanism
Solution Approach 1:
The absorber mechanism is divided into separate functional components including first and second spring elements, coupling elements, and a switching device, allowing each component to be optimized independently while working together to provide vibration absorption
Solution Approach 2:
The switching device serves multiple functions by controlling the configuration of spring elements, enabling the system to operate in different modes (series or parallel spring arrangement) to address various vibration scenarios with a single mechanism
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
This solution enhances the operational stability and precision of hand machine tools by effectively managing vibrations and resonant frequencies, reducing user fatigue and improving the ergonomic design.
Implementation Method 1
a first spring coupled with the first coupling element. Force is applied toward a first direction to a first coupling element moveable alongside of the absorber axis
Implementation Method 2
the first direction corresponds to the effective direction of the first spring acting on the first coupling element
Implementation Method 3
a second spring coupled with the case. Force is applied toward a second direction to a second coupling element moveable alongside of the absorber axis using a second spring
Implementation Method 4
the case pushes the second coupling element toward the second direction opposed to the first direction using the second spring
Implementation Method 5
the first coupling element is frictionally coupled with the second coupling element and with a movement toward the first direction
Data Source
AI summary
The absorber for a hand machine tool according to the invention with a linear drive has a case and a body of mass moveable alongside of an absorber axis relative to the case. Force is applied toward a first direction to a first coupling element moveable alongside of the absorber axis, which is coupled with the body of mass using a first spring. Force is applied toward a second direction to a second coupling element moveable alongside of the absorber axis using a second spring coupled with the case. With a movement toward the first direction, the first coupling element is frictionally coupled with the second coupling element and with a movement toward the second direction, it is uncoupled from the second coupling element.