Clamping Device for Disk Tools with Decoupled Torque
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Solution Overview
Problem
Conventional clamping devices for disk-shaped tools on hand-held power tools face issues such as excessive automatic tightening, difficulty in manual assembly, and risk of jamming due to dynamic reaction forces, often requiring separate tools and posing safety hazards.
Innovation Solution
A clamping device featuring a clamping disk that rests frictionally on the tool, a central screw with a thread on the spindle, and a rotatable securing element that secures the disk against rotation, allowing efficient torque conversion to axial clamping force, with a form-fitting connection between securing elements to prevent jamming and simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If self-tightening clamping nuts are used to achieve automatic tightening during operation, then the clamping force increases sufficiently to prevent slipping, but the clamping nut can be pre-tensioned so strongly that the release mechanism cannot be released by hand and dynamic reaction forces can cause unintentional running off
Solution Approach 1:
The patent applies the dynamics principle by introducing a decoupling mechanism that separates the tightening phase from the clamping phase. During tightening, the screw thread engages with the clamping disc to generate clamping force. During operation, dynamic reaction forces are decoupled from the threaded section through a specific geometric arrangement, preventing self-unlocking while maintaining manual releasability through the release aid.
Solution Approach 2:
The patent uses an intermediary approach by introducing a release aid mechanism that acts as a mediator between the operator and the clamping nut. This release aid provides a mechanical advantage system that enables manual release of the pre-tensioned clamping nut without requiring excessive hand force, thus resolving the contradiction between strong clamping and easy release.
2Force
If conventional clamping devices with nuts and wrenches are used, then sufficient clamping force can be achieved, but a separate wrench must be carried and can be lost
Solution Approach 1:
The patent applies the merging principle by integrating the tightening tool function directly into the clamping device. The operating element is rotationally fixed to the screw, allowing the user to tighten the clamping mechanism using the built-in operating element rather than requiring a separate wrench. This combines multiple functions into a single integrated component, reducing the number of parts and eliminating the need to carry additional tools.
3Extent of automation
If dynamic reaction forces are not decoupled from the threaded section, then the clamping device can tighten excessively on its own, but the clamping device can also run off if the spindle is stopped abruptly
Solution Approach 1:
The patent applies the dynamics principle by introducing a decoupling mechanism that separates the tightening phase from the clamping phase. During tightening, the screw thread engages with the clamping disc to generate clamping force. During operation, dynamic reaction forces are decoupled from the threaded section through a specific geometric arrangement, preventing self-unlocking while maintaining manual releasability through the release aid.
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 ensures secure and efficient axial clamping of disk-shaped tools, preventing automatic loosening and jamming, while allowing manual force to be effectively converted into clamping torque without the need for additional tools, enhancing safety and usability.
Implementation Method 1
a clamping disc (7) which, in an assembled or clamped state of the clamping device (1), frictionally engages the tool (14)
Implementation Method 2
a central screw (2) which can be screwed into a threaded receiving opening (16) formed in an end face (17) of the spindle (10)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a clamping device for axially clamping a disk-shaped tool, preferably a cutting disk, on a flange of a drivable spindle of a hand-held machine tool, comprising a clamping disk which rests against the tool in a friction-fitting manner in the clamped state, a central screw which can be screwed into a threaded receiving opening that is formed in an end face of the spindle, an operating element which can be connected to the screw in a rotationally fixed manner such that a manual force introduced into the operating element is transmitted to the screw in the form of an application torque, and a first securing element which is designed to interact with a corresponding second securing element provided on the flange such that when the screw is at least partly introduced into the receiving opening, the clamping disk is rotationally secured to the flange in a form-fitting manner, wherein the clamping disk can be rotated relative to the screw and the operating element. The first securing element of the clamping device can be rotated relative to the screw and is mounted in a rotationally fixed manner relative to the clamping disk.