Portable Power Tool Handle Damping via Constrained Spring Unit
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Solution Overview
Problem
Handheld power tools, such as rotary and chisel hammers, face challenges in effectively damping vibrations transmitted from the main element to the handle, affecting stability and user comfort without compromising mobility.
Innovation Solution
A spring unit with a leaf spring design connects the handle to the main element, allowing for a predetermined movement path that combines high damping with mobility, using a support means to define the path and prevent perpendicular displacement, thereby enhancing stability and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the handle is movably mounted relative to the main element connected via a spring element, then vibration damping is improved, but handle stability deteriorates
Solution Approach 1:
The handle is designed to be movably mounted relative to the main element through a spring unit, allowing dynamic adjustment and movement in the plane of motion while maintaining stability. The spring unit enables the handle to adapt to vibrations by moving within a defined path rather than being rigidly fixed, thus damping vibrations while preserving stability.
Solution Approach 2:
The spring unit acts as an intermediary element between the handle and the main element. It mediates the connection by providing both vibration damping through its elastic properties and stability through the constrained movement path, resolving the contradiction between mobility and stability.
2Stability of the object's composition
If the handle is rigidly connected to the main element, then handle stability is improved, but vibration damping deteriorates
Solution Approach 1:
Instead of a rigid connection, the handle is dynamically connected through a spring unit that allows controlled movement in the plane of motion. This dynamic connection absorbs vibrations through the spring's elastic deformation while maintaining handle stability through the constrained movement path.
Solution Approach 2:
The spring unit converts the harmful vibration energy into elastic potential energy through its deformation, then dissipates it. The movement path constraint ensures that this energy conversion occurs in a controlled manner that maintains handle stability while effectively damping vibrations.
3Stability of the object's composition
If a guide device is added to prevent handle shifting perpendicular to the plane of motion, then handle stability is improved, but device complexity increases
Solution Approach 1:
The guide device is merged with the spring unit structure itself. The support element of the spring unit simultaneously provides spring functionality and guide functionality, eliminating the need for separate guide components and reducing overall structural complexity while maintaining stability.
Solution Approach 2:
The spring unit is designed to perform multiple functions: vibration damping through elasticity, movement path definition, and guidance perpendicular to the plane of motion. This multi-functionality reduces the need for additional components, thereby reducing device complexity while improving handle stability.
4Object-affected harmful factors
If the spring unit defines a predetermined movement path, then vibration damping is improved, but manufacturing precision requirements increase
Solution Approach 1:
The movement path is segmented into two independent components: the spring unit defines the path in the plane of motion through its elastic properties, while the guide device separately constrains movement perpendicular to this plane. This segmentation allows each component to be manufactured with standard tolerances rather than requiring high precision for the entire path.
Solution Approach 2:
The problem is solved by separating the movement path definition into different dimensions: the spring unit handles the planar movement path through elastic deformation, while the guide device handles the perpendicular dimension. This dimensional separation reduces the precision requirements for each individual component.
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 achieves a high damping effect while maintaining handle mobility, providing improved stability and haptic security during tool operation, reducing assembly complexity and costs by eliminating the need for additional holding elements.
Implementation Method 1
To dampen the transmission of vibrations from the main element to the handle
Implementation Method 2
connected to the main element via a spring element
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A portable power tool, particularly a hammer drill and/or chipping hammer, comprising a main element (12) which is provided with a tool axis (30), a center of gravity (32) and a normal axis (34) extending perpendicularly to the tool axis (30) and through the center of gravity (32), wherein the tool axis (30) and the normal axis (34) define a plane of movement, comprising a handle (14), which is mounted displaceably relative to the main element (12) in the plane of movement, and comprising a spring unit (46) connecting the handle (14) to the main element (12), the unit being provided with at least one spring element (48). It is proposed to provide the spring unit (46) so as to define at least substantially a path of movement (110) for at least a portion of the handle (14) in the plane of movement when a load (102) occurs that prompts the handle (14) to leave an idle position and approach the idle main element (12).