Quick Change Rotary Tool Shank With Segmented Axial Blocking
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Solution Overview
Problem
Existing quick change systems for rotary tools, such as hole saws, are complex and expensive due to their voluminous operating mechanisms and require intricate manufacturing of components.
Innovation Solution
A simplified quick change system featuring a tool holder with an elongate shank and adapter that includes a rotation blocking mechanism and two axial blocking modes, allowing for easy assembly and operation, enabling quick tool changes without the need for complex components or specialized drill chucks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a quick change system uses a complex operating mechanism to secure tool attachment, then the reliability of tool attachment is improved, but the device complexity increases and manufacturing cost increases
Solution Approach 1:
The blocking mechanism is segmented into two independent axial blockings (first and second axial blocking) that operate in opposite directions. The first axial blocking handles forces in one direction while the second axial blocking handles forces in the opposite direction, allowing each component to be simpler and more reliable without requiring a complex unified mechanism.
Solution Approach 2:
The shank acts as an intermediary element between the tool adapter and the drilling machine. It transmits forces and enables tool changes without requiring complex direct coupling mechanisms, simplifying the overall system while maintaining secure attachment.
2Ease of operation
If a quick change system uses a complex operating mechanism to enable tool exchange, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The operating mechanism is segmented into simple, independent blocking elements (first axial blocking with blocking element, second axial blocking with blocking surface) that can be operated separately. This segmentation allows for easy tool exchange through simple blocking/unblocking actions rather than complex coordinated movements.
Solution Approach 2:
Instead of using a complex mechanism to actively secure the tool, the system uses passive blocking surfaces and elements that naturally prevent tool displacement. The tool change is achieved by reversing the blocking state (from blocked to unblocked) rather than by complex active engagement mechanisms.
3Reliability
If the first axial blocking is designed to withstand large axial forces, then the reliability is improved, but the ease of manufacture decreases
Solution Approach 1:
The axial force resistance is segmented between two independent blockings: the first axial blocking (with blocking element) handles forces in one direction, while the second axial blocking (with blocking surface) handles forces in the opposite direction. This segmentation allows each blocking component to be manufactured simply without requiring complex high-strength designs.
Solution Approach 2:
The blocking element and blocking surface are designed as simple, easily manufactured components that can be replaced if needed. Rather than designing expensive, highly durable blocking components, the system uses simple geometric features that are cheap to manufacture and sufficient for the application.
Data Source
Figure 1~2
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Figure 5~6B
AI summary
The present invention relates to a quick change system for rotary tools (9), particularly hole saws, comprising an elongate shank (11) and a tool adapter (15) for coupling a rotary tool (9) to the shank (11). The quick change system according to the invention comprises a rotation blocking, a first axial blocking which can be operated and a second axial blocking which cannot be operated. The present invention also relates to a shank (11) and a tool adapter (15) for the purpose of forming a quick change system for rotary tools (9).