Vibration-Damped Handle Lever Mechanism for Power Tools
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Solution Overview
Problem
Hand-held power tools with percussive drives, such as rotary hammers, experience strong vibrations that are transmitted to the handle, causing discomfort and potential health hazards due to inadequate vibration damping in existing designs.
Innovation Solution
A vibration-damped handle design featuring two legs running in the longitudinal direction, with levers articulated transversely and connected to the machine housing via a single bearing point, utilizing spring elements for resilient coupling and reduced friction, allowing for effective decoupling from machine vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the handle is rigidly coupled to the machine housing, then structural stability is maintained, but vibration transmission to the operator increases
Solution Approach 1:
The patent introduces an intermediary vibration damping assembly between the handle and machine housing. This assembly includes damping elements (such as rubber or viscoelastic materials) that act as mediators to absorb and dissipate vibration energy, preventing direct transmission of harmful vibrations to the operator while maintaining structural connection
Solution Approach 2:
The vibration damping assembly is pre-installed between the handle and housing to provide beforehand cushioning against vibrations. The damping elements are positioned to absorb vibration energy before it reaches the operator's hand, effectively cushioning the impact of machine vibrations in advance
2Object-affected harmful factors
If vibration damping elements are added between handle and housing, then vibration damping is improved, but device complexity increases
Solution Approach 1:
The patent merges the vibration damping function with the existing handle and housing structure. The damping elements are integrated into the connection interface between handle and housing, combining multiple functions (structural support, vibration damping, and alignment) into a unified assembly rather than adding separate complex damping mechanisms
Solution Approach 2:
The patent changes the physical parameters of the connection interface by introducing viscoelastic damping materials with specific viscosity and elasticity properties. These parameter changes enable effective vibration damping while maintaining a relatively simple structural configuration, avoiding complex mechanical damping systems
3Stability of the object's composition
If multiple bearing points are used for lever connections, then connection stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the lever connection into distinct functional elements: the lever arm, the bearing point (pivot), and the damping assembly. This segmentation allows each component to be optimized independently and assembled relatively simply, reducing manufacturing complexity while maintaining connection stability through proper geometric relationships
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 provides enhanced vibration damping, improving operator comfort and safety by isolating the handle from harmful vibrations, while maintaining a compact and stable design that facilitates easier handling of power tools.
Implementation Method 1
the handle being supported on the housing with spring force
Implementation Method 2
Effective vibration damping is achieved by switching on a resilient element
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention is based on a portable power tool having a vibration-damped handle (10) which has two legs (12, 14) running in the longitudinal direction (48) of the portable power tool and which is motionally coupled to its housing (28), wherein at least one lever (20, 22; 20a, 22a; 20b, 22b) oriented transversely to the longitudinal direction (48) is coupled to each of the two legs (12, 14) at an articulation point (16, 18; 16a, 18a), and wherein the levers (20, 22; 20a, 22a; 20b, 22b) are coupled to a joint region (50) lying between the two legs (12, 14) of the handle (10). It is proposed that each lever (20, 22; 20a, 22a; 20b, 22b) have a bearing point (24, 26; 24a, 20 26a; 24b, 26b) between the joint region (50) and the respective articulation point (16, 18; 16a, 18a).