Saw Pivot Linkage That Redirects Braking Torque
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Solution Overview
Problem
Conventional saw devices experience tilting movements during braking, which can lead to serious injuries when the tool is braked quickly, as the braking torque is supported in the tilt joint, causing the saw blade to pivot towards the user.
Innovation Solution
A multi-joint arrangement that absorbs and redirects forces during braking, maintaining pivotability and preventing the tool from tilting into the working area, thereby minimizing the risk of injury by pivoting the tool away from the user during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the tool is braked in a short time by means of the tool braking device, then the braking response time is reduced and user injury risk is minimized, but the braking torque causes the tool to pivot in the feed direction towards the user
Solution Approach 1:
A force redirection mechanism acts as an intermediary between the braking torque and the tilt joint. When the brake engages the rotating tool, the resulting braking torque is redirected through this mechanism to a different support structure, preventing the torque from being transmitted to the tilt joint and causing unwanted tool pivoting towards the user.
Solution Approach 2:
The support structure is segmented into functionally independent components: the tilt joint maintains pivotability for feed/removal movements, while a separate braking force support structure absorbs and redirects the braking torque. This segmentation allows the tilt joint to remain responsive to user control while isolating it from harmful braking forces.
2Speed
If a conventional braking system is used, then the tool rotation is stopped quickly, but the braking force is supported in the tilt joint causing loss of pivotability
Solution Approach 1:
The force redirection mechanism serves as an intermediary that decouples the braking force from the tilt joint. This allows the tool to be braked effectively while maintaining the tilt joint's pivotability, as the braking forces are redirected to a separate support structure that does not interfere with the pivot movement.
Solution Approach 2:
By segmenting the force support functions, the patent separates the pivot support function (handled by the tilt joint) from the braking force support function (handled by the separate braking force support structure). This ensures that braking operations do not compromise the ease of pivoting the tool for feed and removal movements.
3Device complexity
If the braking torque is supported in the tilt joint, then the braking structure is simplified, but the tool pivots in the feed direction causing serious injuries
Solution Approach 1:
The force redirection mechanism acts as an intermediary that transfers braking forces from the tool rotation axis to a separate support structure. This adds a moderate level of structural complexity but eliminates the harmful pivoting effect, as the tilt joint is no longer directly supporting the braking torque.
Solution Approach 2:
The patent segments the force support functions into two independent systems: the tilt joint for supporting pivot movements and a separate braking force support structure for absorbing braking torques. This segmentation prevents the harmful interaction between braking forces and tool pivoting, justifying the increased structural complexity through enhanced safety.
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 multi-joint arrangement effectively increases operational safety by preventing the tool from pivoting towards the user during braking, reducing the severity of potential injuries and ensuring the tool can still be manually pivoted during and after braking, even when the brake is engaged.
Implementation Method 1
The multi-joint arrangement (6) is designed to absorb and/or redirect forces occurring during braking of the tool rotary movement (9)
Data Source
AI summary
A tool device, in particular a saw device, having a tool for processing a workpiece located in a working area. The tool device includes a tool braking device for braking a tool rotary movement of the tool, and a multi-joint arrangement by means of which the tool can be pivoted selectively in a feed direction into the working area or in a removal direction out of the working area. The multi-joint arrangement is designed to, while maintaining the pivotability of the tool, absorb and/or redirect forces occurring during braking of the tool rotary movement, so that the tool is not pivoted in the feed direction by the forces occurring during braking of the tool rotary movement or is pivoted in the removal direction by the forces occurring during braking of the tool rotary movement.