Non-rotating Percussion Mechanism for Handheld Power Tool Attachment
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Solution Overview
Problem
Handheld power tools struggle to perform professional chiseling operations in hard media like concrete or stone due to inadequate rotational and percussion movements, and existing solutions lack compactness and versatility in tool attachments.
Innovation Solution
A tool attachment with a non-rotating tool receptacle and a percussion mechanism that applies axial percussions, integrated with a drive element and spring-loaded structure, allowing for direct percussive drive and automatic reset, enabling efficient chiseling in hard materials while preventing tool rotation during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tool receptacle is allowed to rotate during operation, then the insert tool can perform rotational movements, but the insert tool cannot perform professional chiseling operations in hard media due to inadequate rotational and percussion movements
Solution Approach 1:
The tool receptacle is designed to be dynamically switchable between two operational modes: a non-rotating state for percussion-only chiseling operations in hard media, and a rotatable state for operations requiring rotational movement. This dynamic configuration allows the same tool to adapt to different working conditions and material types, resolving the contradiction between specialized chiseling capability and general rotational functionality.
2Power
If a percussion mechanism is integrated into the tool attachment, then high percussion energy can be generated for intensive chiseling, but the spatial dimensions of the mechanism increase
Solution Approach 1:
The percussion mechanism is nested within the existing tool attachment housing structure, utilizing the available internal space efficiently. The mechanism is positioned coaxially with the tool receptacle, allowing compact arrangement of components such as the percussion body, spring element, and ball guide within the constrained volume of the attachment housing, thereby generating high percussion energy without significantly increasing overall spatial dimensions.
3Reliability
If the tool attachment is designed for professional chiseling operations, then it can handle hard media effectively, but the device complexity increases
Solution Approach 1:
The percussion mechanism is segmented into distinct functional components: a percussion body for generating impact forces, a spring element for storing and releasing elastic energy, and a ball guide with engagement clutch for controlling activation. This segmentation allows each component to be optimized for its specific function while maintaining overall simplicity, ensuring reliable chiseling performance without excessive complexity.
4Productivity
If the tool receptacle is fixed in a non-rotating way during percussion operation, then professional chiseling operation is enabled, but the insert tool cannot perform combined rotational and percussion movement
Solution Approach 1:
The tool receptacle is designed with dynamic positioning capability, allowing it to be fixed in a non-rotating position during percussion-only operations for maximum chiseling efficiency, and released to allow rotational movement when combined rotational and percussion operations are required. This dynamic control resolves the contradiction between optimized chiseling productivity and operational versatility.
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 a compact, robust, and versatile tool attachment capable of generating high percussion energy for intensive chiseling in hard materials like stone or concrete, with a reliable and simple activation mechanism, and compatibility with various insert tool types.
Implementation Method 1
The percussion mechanism has a percussion body, which is spring-loaded by a spring element
Implementation Method 2
coupled via a ball guide with an associated spring tensioning element
Data Source
AI summary
In a tool attachment for a handheld power tool, which includes a tool housing having a fastening interface, having an attachment housing, on which a locking unit, for locking the tool attachment on the fastening interface of the handheld power tool, and a tool receptacle for accommodating an insert tool are situated, a percussion mechanism is situated in the attachment housing, which is configured to apply percussions carried out in the axial direction in relation to the tool receptacle to an insert tool, which is situated in the tool receptacle, during percussion operation of the tool attachment, the tool receptacle being fixed in position in the attachment housing in a non-rotating way at least during percussion operation.