Quick Clamping Device for Angle Grinders with Transverse Positive Engagement
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Solution Overview
Problem
Existing quick-change clamping devices for portable power tools, such as power angle grinders, face challenges in securely fixing insert-tool units without tools, often requiring complex operations and providing insufficient safety and convenience.
Innovation Solution
A quick-change clamping device with a movably mounted clamping element that engages transversely with the insert-tool unit, utilizing a positive-engagement mechanism and a spring element for automatic clamping, and an operating unit for easy movement between clamping and release positions, ensuring secure and tool-free attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a quick-change clamping device is used to fix insert-tool units without tools, then the ease of operation is improved, but the reliability of securing the insert-tool unit may be insufficient
Solution Approach 1:
The clamping device is divided into separate functional elements: a clamping element with positive engagement features, a clamping unit with spring mechanism, and an operating unit. This segmentation allows each component to perform its specific function efficiently while maintaining overall reliability through the coordination of multiple simple, well-defined parts.
Solution Approach 2:
The spring element is pre-loaded to automatically apply clamping force as soon as the insert-tool unit is inserted. The positive engagement elements are pre-positioned to engage with the insert-tool unit without requiring additional securing actions, ensuring reliability is established before the operator releases the operating unit.
2Reliability
If a complex clamping mechanism is used to ensure secure fixing, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The complex multi-step securing operations are extracted and replaced by a single integrated clamping mechanism that performs all necessary securing actions simultaneously through the positive engagement elements and spring-loaded clamping element, reducing complexity while maintaining reliability.
Solution Approach 2:
The spring element automatically generates and applies the clamping force without requiring additional actuators or complex control mechanisms. The positive engagement elements self-align and engage with the insert-tool unit features, making the system self-regulating and reducing the need for complex external control systems.
3Device complexity
If manual clamping operations are used, then the device complexity is reduced, but the operator effort and time required increase
Solution Approach 1:
The clamping element operates in a periodic cycle: the operating unit is actuated to release the clamping force, the insert-tool unit is quickly exchanged, and upon release the spring automatically restores the clamping force. This periodic operation enables rapid tool changes while maintaining simple mechanical components.
Solution Approach 2:
The spring element continuously maintains clamping force on the insert-tool unit without requiring active control or additional energy input. This continuous passive clamping action eliminates gaps in the securing process that would otherwise require complex control systems to manage, reducing both time and complexity.
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 safe, simple, and convenient method for securing insert-tool units, enabling reliable and efficient operation with reduced operator effort and enhanced safety.
Implementation Method 1
The clamping force is applied, in particular automatically, by the quick-change clamping device, such as, for example, by a spring element
Data Source
AI summary
A quick clamping device for a portable power tool, in particular an angle grinder, includes an output shaft that is configured to be driven in rotation and at least one clamping unit that is configured to fix an application tool unit to the output shaft without tools. The clamping unit has at least one movably mounted clamping element configured to apply a clamping force to the application tool unit in a clamping position of the clamping element. The clamping element is formed by a positive-locking element that is movable transversely to an axis of rotation of the output shaft and is configured to engage behind at least a subregion of the application tool unit in a positive-locking manner so as to secure the application tool unit.