Spring-Loaded Handle Suspension for Compact Power Tool Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hand-held power tools with spring-loaded handles experience increased constructional length due to vibration insulation methods, leading to inconvenient handling, especially with electropneumatic tools that include a drive motor and transmission.
Innovation Solution
The handle suspensions extend transversely around the drive assembly, with damping bodies and elastomer rings to minimize additional length and vibration transmission, allowing for a compact and stable design that limits vibration energy transfer during extreme loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spring-loaded handle suspensions are used to insulate handles from vibrations, then vibration transmission to handles is reduced, but the constructional length of the tool increases considerably
Solution Approach 1:
The handle suspensions are arranged to extend over both spatial axes transverse to the operational axis and to sectionwise circumferentially surround the drive assembly. This three-dimensional arrangement allows the suspensions to provide vibration insulation while fitting within the compact housing space, avoiding excessive length extension in any single direction.
Solution Approach 2:
The handle suspensions are positioned to surround the drive assembly (which includes impact device, drive motor, and transmission), effectively nesting the suspension components around the central drive components. This nested arrangement allows vibration insulation without adding significant external dimensions to the tool.
2Length of moving object
If handle suspensions extend around the drive assembly to maintain compact form, then constructional length is reduced, but vibration insulation effectiveness may be compromised
Solution Approach 1:
By extending the handle suspensions over both spatial axes transverse to the operational axis and arranging them to sectionwise circumferentially surround the drive assembly, the suspension provides multi-directional vibration insulation within a compact footprint, maintaining both compactness and effectiveness.
3Object-affected harmful factors
If damping end stops are added to limit pivot range of handle suspensions, then vibration energy is reduced under extreme loads, but device complexity increases
Solution Approach 1:
Damping end stops are provided between the handle suspensions to form end stops against which the suspensions can be put up. These end stops provide beforehand cushioning for extreme load conditions, limiting the pivot range and reducing vibration energy transmission to the handles when vibrations exceed the normal pivot range.
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 results in a compact, comfortable, and vibration-reduced hand-held power tool that maintains stability and reduces vibration intensity at the handles, ensuring effective handling and operation.
Implementation Method 1
Both handles are respectively held in their initial position by spring means
Implementation Method 2
these vibrations are transmitted at considerably reduced intensity to the handles
Implementation Method 3
spring-loaded handle suspensions
Data Source
AI summary
A portable hand-held power tool (2), especially in the form of a drilling or chisel hammer, includes a drive assembly (8) located in the tool housing (10) for driving a tool spindle (4) along an operational axis (A), a first handle (16) which is rotatable around a first pivotal axis (S1) by a first handle suspension (22), a second handle (20) located on the opposite sides (14.1, 14.2) of the housing which is rotatable around a second pivotal axis (S2) by a second handle suspension (24), and spring elements for retaining the handles (16, 20) in their initial position, with the first and second handle suspensions (22, 24) extending partially circumferentially about the drive assembly (8).