Elastic Housing Connection for Power Tools via Membrane Anchoring
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Solution Overview
Problem
Existing elastic connections in motor-driven machine tools, particularly in electrically driven hand-held tools, face challenges in achieving stable anchoring with high flexibility and effective vibration damping, especially under varying loads and geometric configurations.
Innovation Solution
A membrane-like elastic connecting element with webbed sections that pass through openings in the housing parts, providing a strong and flexible connection by overlapping cover parts, allowing for design customization in shape, elasticity, and strength, and enabling vibration damping through a potentially different material in the middle section compared to the edge sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connection structure is used between housing parts, then structural strength is improved, but flexibility and vibration damping capability deteriorate
Solution Approach 1:
The patent employs a membrane-like connecting element (Beinverbindungselement) with a web (Spross) that passes through openings in housing parts. This membrane structure provides both mechanical strength for stable anchoring and inherent flexibility for vibration damping, resolving the contradiction between rigid strength and flexible adaptability.
Solution Approach 2:
The connecting element features a differentiated structure where the web portion has different properties than the cover portions (Deckteile). This composite design allows the web to provide structural strength while the cover portions provide flexibility and vibration damping, simultaneously achieving both contradictory requirements.
2Adaptability or versatility
If a membrane-like structure is used for high flexibility and vibration damping, then adaptability is improved, but connection strength deteriorates
Solution Approach 1:
The membrane-like connecting element with web structure provides high flexibility and vibration damping capability while maintaining adequate connection strength through its geometric design and material selection, enabling it to bridge gaps between housing parts effectively.
Solution Approach 2:
The differentiated structure of the connecting element, with distinct web and cover portions, allows optimization of each region: the web provides structural integrity for strength, while the cover portions maximize flexibility and damping performance, resolving the strength-flexibility trade-off.
3Strength
If webbed sections passing through openings are used for stable anchoring, then connection strength is improved, but device complexity increases
Solution Approach 1:
The connecting element is segmented into distinct functional portions: the web (Spross) that passes through openings for anchoring, and the cover portions (Deckteile) that provide flexibility. This segmentation allows each part to perform its specific function optimally while maintaining overall simplicity.
Solution Approach 2:
The single connecting element performs multiple functions simultaneously: it provides structural anchoring through the web, flexibility through the membrane structure, and vibration damping through its elastic properties. This multi-functionality reduces the need for separate components, simplifying the overall connection structure.
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 configuration creates a robust, flexible connection that effectively dampens vibrations and accommodates diverse loads and geometric arrangements between housing parts, ensuring stable anchoring and vibration decoupling, particularly suitable for injection molding and use with handles or guiding parts.
Implementation Method 1
a membrane-like elastic connecting element (4) which is connected in a form-fitting manner to the gap (7) and which has a middle section (10) and opposite edge sections (11, 12)
Implementation Method 2
Taking into account the loads and stresses acting on the connecting element and/or to be transmitted via the connecting element
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
An elastic connection is established between housing parts (2, 3) of a power-driven machine tool by means of an elastic connecting element (4) with positive anchorage with respect to the housing parts (2, 3).