Angle Grinder Tool Holder for Tool-Less Secure Tool Changes
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Solution Overview
Problem
Existing hand-held power tools require additional tools or fastening elements for tool changes, which are time-consuming and inconvenient, especially at high rotational speeds.
Innovation Solution
A hand-held machine tool with a tool holder device that allows tool attachment and detachment without additional securing elements, utilizing a clamping device with movable hook devices that engage and disengage with centrifugal force at high speeds, enabling quick and tool-less tool changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional fastening elements or tools are used for tool changes, then secure attachment is achieved, but tool change time increases and operation becomes more complex
Solution Approach 1:
The invention extracts and eliminates the need for separate fastening elements and tools by integrating the clamping function directly into the tool holder device. The clamping device with movable clamping jaws provides secure attachment without requiring additional securing elements, thus reducing tool change time while maintaining reliable tool attachment.
Solution Approach 2:
The clamping device is designed to be actuated directly by the user's hand during tool insertion, making the fastening process self-service and eliminating the need for separate fastening tools. The mechanical advantage provided by the lever arm enables the clamping action to be performed easily by hand, achieving both speed and security in tool attachment.
2Reliability
If additional fastening elements or tools are used for tool changes, then secure attachment is achieved, but device complexity increases
Solution Approach 1:
The invention merges the functions of tool holding and tool fastening into a single integrated tool holder device. The clamping device with its movable clamping jaws and lever arm is built into the tool holder, eliminating the need for separate fastening elements and tools. This integration reduces device complexity while maintaining secure tool attachment.
Solution Approach 2:
The tool holder device is designed with multi-functionality, serving both as the tool mounting structure and as the fastening mechanism. The clamping device can accommodate different tool types while providing a universal fastening action through its movable clamping jaws and lever arm system, reducing the need for multiple specialized components.
3Productivity
If clamping device is activated by hand, then tool change speed increases, but clamping force may be insufficient at high speeds
Solution Approach 1:
The clamping device is designed with dynamic characteristics where the clamping force increases with the rotational speed of the tool holder. The movable clamping jaws and lever arm system are configured to utilize centrifugal forces generated during high-speed rotation to enhance the clamping action, ensuring sufficient holding force is achieved automatically as the tool holder reaches operating speed.
Solution Approach 2:
The invention utilizes parameter changes where the clamping force is not static but varies with the operational parameters of the tool holder. As the rotational speed increases, the dynamic forces acting on the clamping device increase, automatically adjusting the clamping force to be sufficient for high-speed operation while maintaining quick manual activation capability.
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
Facilitates fast and convenient tool changes by eliminating the need for additional tools, ensuring secure attachment and detachment, and reducing operational time.
Implementation Method 1
as the rotational speed of the tool holder increases, the clamping device can exert an increased clamping force on the tool holder due to a centrifugal force acting on the clamping device
Data Source
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AI summary
The invention relates to a machine tool, in particular a hand-held machine tool, preferably an angle grinder, which has a tool holding device that is rotatable about an output axis, wherein this tool holding device is configured to hold a tool device, in particular an insert tool, on the machine tool in such a way that the output axis and a tool rotation axis essentially coincide, wherein the tool holding device has at least one driving device and a clamping device movable relative to the driving device, wherein this driving device has at least one torque transmission area arranged at a distance from this output axis for transmitting a drive force to the tool device.It is proposed that the driving device and the clamping device be designed to reach through a recess in the tool device, in particular extending through the entire material thickness of the tool device, and to clamp the tool device by means of the clamping device which is movable essentially in a radial direction to the output axis.