Swiveling Blade Guard for Power Cutter Kick-Back Protection
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Solution Overview
Problem
Existing power tools, such as power cutters, face the risk of kick-back incidents where the cutting disc moves towards the user, potentially causing injury due to the lack of comprehensive protection during such events.
Innovation Solution
A hand-held power tool with a rotatable work tool featuring a blade guard arrangement that includes a swiveling cover part attached to the blade guard, biased towards a first position to shield a portion of the cutting disc, allowing initial cutting on an uncovered arc and moving to a second position for full coverage during kick-back conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blade guard arrangement with a swiveling cover part is used to shield the cutting disc during kick-back incidents, then user protection is improved, but the complexity of the device increases
Solution Approach 1:
The blade guard arrangement employs a swiveling cover part that can dynamically change its position between a first position (shielding the cutting disc) and a second position (allowing cutting operations). This dynamic structure allows the system to adapt to different operational states, providing protection when needed while maintaining ease of operation.
Solution Approach 2:
The biasing member automatically returns the swiveling cover part to the first protective position after it has been moved to the second position for cutting. This self-service mechanism ensures that the protective function is restored without requiring manual intervention from the user, thereby maintaining high reliability while minimizing operational complexity.
2Reliability
If the swiveling cover part is biased towards the first position to provide protection, then safety during kick-back is improved, but the ease of operation for cutting is reduced
Solution Approach 1:
The swiveling cover part is designed to be movable between two distinct positions: the first position for protection and the second position for cutting. The biasing member provides a restoring force that automatically returns the cover to the protective first position after use, ensuring that safety is maintained while allowing easy access for cutting operations when needed.
3Reliability
If the cover part shields a first arc of a circle following the blade guard, then protection during kick-back is improved, but the productivity for initial cutting is reduced
Solution Approach 1:
The blade guard arrangement provides protection specifically for the first arc of a circle that follows the blade guard, while leaving the second arc uncovered to allow for efficient initial cutting operations. This localized protection approach ensures that the most critical areas are protected during kick-back incidents while maintaining productivity for normal cutting tasks.
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 provides enhanced user protection by ensuring the cutting disc is shielded during kick-back incidents while allowing flexible and safe initial cutting, with a biasing mechanism that facilitates smooth movement between covered and uncovered positions.
Implementation Method 1
The cover part is biased in the direction of rotation, towards the first position by means of a biasing member
Data Source
AI summary
A hand-held power tool may include a rotatable work tool with a center, a circumference and a direction of rotation. The power tool may further include a blade guard arrangement arranged to shield a variable part of the rotatable work tool which may include a blade guard and a swiveling cover part attached to the blade guard. In a first position, the swiveling cover part may be positioned such that a first portion of the circumference is covered, following the blade guard, and extending an angular distance after the blade guard, in the direction of rotation. The swiveling cover part may be moveable between the first position and a second position where a cutting operation of the rotatable work tool along the first portion of the circumference occurs. The cover part may be biased towards the first position.