Rotary Tool Holder with Movable Restraint Elements for Easy Release
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Solution Overview
Problem
Existing holders for rotary tools, such as hole saws, are cumbersome and difficult to disassemble due to complex designs requiring multiple springs, leading to assembly challenges and increased risk of functional disorders, and they often restrict the depth of bore due to larger diameters.
Innovation Solution
A slimmer holder design with a rotationally symmetrical body, featuring a thrust collar and axially movable operating means that allows for either linear or rotational motion to displace restraint elements, reducing the number of components and simplifying assembly, while eliminating thread stresses for easy tool replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a holder uses a complex design with multiple springs and restraint elements to enable tool removal, then the tool can be removed by eliminating thread preload, but the device complexity increases and assembly becomes difficult
Solution Approach 1:
The patent combines multiple springs (first spring means acting radially and second spring means acting axially) and restraint elements into a single integrated holder structure. The restraint elements are positioned in spaces within the holder body and work in conjunction with both spring systems to provide tool retention and release functions, merging what could be separate components into one unified device.
Solution Approach 2:
The holder employs dynamic restraint elements that can move between different positions. The restraint elements are prevented from radial movement in a first axial position of the operating means and are free to make radial movement in a second axial position, allowing the system to transition between tool retention and tool release states through controlled movement of the restraint elements.
2Ease of operation
If a holder uses a bulky design with larger diameter to accommodate friction means and springs, then tool retention and release functions can be achieved, but the holder limits the possible depth of bore since it will be blocked by the workpiece
Solution Approach 1:
The patent utilizes axial dimension for the operation of restraint elements and springs rather than requiring increased radial dimension. The restraint elements move radially within axial spaces, and the operating means moves axially to control this radial movement, effectively using the axial dimension to achieve functions that would otherwise require larger radial clearance.
Solution Approach 2:
The restraint elements are nested within spaces in the holder body, and the operating means is positioned within the holder to control these restraint elements. The spring means are arranged to act upon the restraint elements from within the holder structure, creating a nested arrangement where components are contained within one another to minimize overall holder diameter.
3Adaptability or versatility
If a holder uses numerous components including two types of springs and multiple restraint elements, then functional capability is enhanced, but the number of components increases making assembly difficult and serviceability reduced
Solution Approach 1:
The holder design integrates multiple functions into unified components. The restraint elements serve dual purposes: they are prevented from radial movement in the first axial position to retain the tool, and are free to move radially in the second axial position to release the tool. The operating means controls both the position of restraint elements and the activation of spring mechanisms, reducing the need for separate dedicated components for each function.
4Device complexity
If a holder uses a design requiring diameters greater than hole saw diameters, then friction means and spring mechanisms can be accommodated, but the holder blocks the workpiece and limits drilling depth
Solution Approach 1:
The patent employs thin-walled or compact structural elements in the holder design that provide sufficient strength and functionality while minimizing the outer diameter. The restraint elements and spring mechanisms are arranged to operate within compact spaces, allowing the holder to maintain a slim profile that does not interfere with deep drilling operations.
Data Source
Figure 1~2
Figure 3~5b
Figure 6a~7b
AI summary
Holder (10) for a rotary tool (21) which holder (10) is formed with a holder body (100) comprising a rear drive end (11) and a front connection end (12) having a connection thread (13) for the connection of the tool (21). The holder (10) comprises a thrust collar (14, 64) having a flat contact surface (141) facing a connection end (12) of the holder (10). The holder comprises an axially movable operating means (15), a number of restraint elements (16) placed in one or more spaces (17) in the holder body which restraint elements (16) in a first axial position of the operating means (15) are prevented from radial movement in said spaces (17) and which restraint elements (16) in a second axial position of the operating means (15) allow radial movement in said spaces (17). Each one of said spaces (17) for the restraint elements (16) is limited in the axial direction by a front limiting wall (47) as well as by a rear limiting wall (46, 66), which two limiting walls (46, 66, 47) are parts of the holder body (100).