Anti-Vibration Handle Assembly for Portable Tools
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Solution Overview
Problem
The assembly of portable hand-held power tools with anti-vibration systems is complex and requires high installation effort, making replacement or repair difficult due to the need for extensive disassembly.
Innovation Solution
A hook element or bayonet connection is used to positively engage the pressure piece with the housing before the loop handle is mounted, allowing for easy assembly and maintenance without tools, with the spring preload applied during attachment, enabling late-stage assembly of the spring arrangement and simplifying the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compression spring is mounted between two pressure pieces with a complex assembly process, then the anti-vibration effect is achieved, but the assembly complexity and installation effort increase significantly
Solution Approach 1:
The invention divides the anti-vibration system into separable modules: the compression spring remains in the housing, while the pressure piece with hook element can be independently attached to the loop handle. This segmentation allows the spring arrangement to be assembled separately and connected later, reducing overall assembly complexity while maintaining the complete anti-vibration function.
Solution Approach 2:
The compression spring is pre-installed in the housing and pre-loaded before the loop handle is attached. This preliminary action allows the spring to be positioned and tensioned in advance, simplifying the final assembly step where only the pressure piece needs to be hooked to the handle, rather than assembling all components simultaneously.
2Reliability
If the pressure piece is attached to the loop handle with multiple components, then the spring preload is maintained, but the replacement and repair process requires extensive disassembly
Solution Approach 1:
The pressure piece is designed as a separate, self-contained component with an integrated hook element that can be independently attached to the loop handle and detached when needed. This segmentation enables the pressure piece to be replaced without disassembling the housing, motor, or gear components, significantly improving ease of repair while maintaining spring preload through the dedicated hook connection.
3Reliability
If the compression spring is placed under tension during assembly, then the anti-vibration function is activated, but the assembly process requires precise positioning and simultaneous operations
Solution Approach 1:
The compression spring is pre-installed in the housing and pre-loaded to the correct tension before the loop handle assembly is attached. This preliminary action eliminates the need for precise simultaneous positioning of multiple components during assembly. The pressure piece is then simply hooked to the handle, allowing the spring tension to be applied gradually without requiring coordinated operations.
Solution Approach 2:
Instead of attaching the spring to the handle and then loading it, the invention inverts the sequence by first installing the spring in the housing in its loaded state, then attaching the handle assembly. This reversal allows the spring to be tensioned independently without requiring the handle to be in its final position, significantly simplifying the assembly process.
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 approach simplifies the assembly and maintenance of anti-vibration systems, reducing the complexity and effort required, while maintaining the anti-vibration effect by allowing the loop handle to pivot freely within the elongated hole, thus reducing vibration levels.
Implementation Method 1
A compression spring (6) is arranged in an axial direction (12) between the two pressure pieces (7, 8). The internal arrangement leads to a compact, heavy-duty design with subsequent assembly of the loop handle (3) and its connection to the spring arrangement (6, 7, 8) being simplified.
Implementation Method 2
The loop handle (3) is pivotably mounted with its first leg (4) on the housing (2). The connection of the second leg (5) to the housing (2) allows a pivoting relative movement between the loop handle (3) and the housing (2) in the area of the second leg (5).
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The portable manually-operated machine tool has a housing (2) and a handle (3), which is fixed at the housing with two axle journals (4,5). The handle is supported in a tiltable manner with the former axle journal at the housing. The connection of the latter axle journal with the housing allows a swiveling relative motion between the handle and the housing. The grip side thrust piece (7), without mounted handle with the housing, is jammed positively by a hooking element (10) engaging into a receptacle (9) of the housing.