Power Tool Clamping Mechanism for Fast Tool Changes
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Solution Overview
Problem
Existing power tools require complex and time-consuming processes for tool changes, often necessitating additional securing elements like fastening screws, and lack efficient clamping mechanisms that can maintain torque transmission at high rotational speeds.
Innovation Solution
A power tool design featuring a tool receiving device with a clamping system that includes movable hook devices, allowing for rapid tool attachment and detachment without additional securing elements, and maintaining increased clamping force at higher rotational speeds due to centrifugal force, with a torque transmission region positioned at a distance from the output axis to facilitate efficient force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fastening screws and complex clamping mechanisms are used, then tool securing reliability is improved, but tool change time increases and device complexity increases
Solution Approach 1:
The patent removes traditional fastening screws and complex clamping mechanisms from the tool change system. Instead, it uses a simple bayonet-style coupling mechanism where the tool is inserted and secured by a single rotational movement, extracting the unnecessary complexity while maintaining securing reliability
Solution Approach 2:
The patent inverts the traditional approach by using a spring-loaded ejector mechanism that normally holds the tool in place, and requires a deliberate release action to remove the tool. This is opposite to traditional designs where tools are held by friction or screws and require active clamping to secure
2Reliability
If additional securing elements like fastening screws are used, then tool securing reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes all additional securing elements such as fastening screws, nuts, and complex clamping mechanisms. The tool securing is achieved through a simple bayonet coupling with a single rotational locking movement, eliminating unnecessary components while maintaining reliable tool attachment
Solution Approach 2:
The patent combines the tool insertion, positioning, and securing functions into a single integrated bayonet coupling mechanism. The rotational movement simultaneously achieves tool orientation, engagement, and locking, merging multiple functions that traditionally required separate components
3Reliability
If clamping force is increased to maintain torque transmission at high rotational speeds, then torque transmission reliability is improved, but the clamping mechanism complexity increases
Solution Approach 1:
The patent employs a spring-loaded ejector mechanism that uses elastic force to maintain constant radial clamping pressure on the tool. The spring counteracts centrifugal forces generated at high rotational speeds, ensuring reliable torque transmission without requiring complex active control systems
Solution Approach 2:
The spring-loaded ejector mechanism automatically adjusts and maintains optimal clamping force through its own elastic properties. The system is self-regulating, where the spring compression and expansion automatically compensate for variations in tool installation and rotational speed, eliminating the need for external control mechanisms
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
Enables rapid and convenient tool changes without additional securing elements, maintains high clamping force at high rotational speeds, and ensures efficient torque transmission, enhancing operational efficiency and safety.
Implementation Method 1
maintaining increased clamping force at high rotational speeds due to centrifugal force
Data Source
AI summary
A power tool, in particular a hand-held power tool, includes a tool-holding device that rotates about an output axis. The tool-holding device is configured to hold a tool device on the power tool such that the output axis and a tool rotation axis substantially coincide. The tool-holding device has at least a driver device and a clamping device that is movable relative to the driver device. To transfer a driving force to the tool device, the driver device has at least one torque transfer region that is arranged at a distance from the output axis. The driver device and the clamping device are configured to reach through a cut-out of the tool device, which cut-out extends through the entire material thickness of the tool device, and to clamp the tool device via the clamping device, which is movable substantially in a direction radial to the output axis.