Hand-Held Circular Saw Display Device for Accurate Cutting Alignment
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Solution Overview
Problem
Users of hand-held circular saws, particularly plunge saws and pendulum hood saws with closed saw blade covers, face difficulties in visualizing the saw blade position due to poor visibility, leading to inaccurate cutting depths and potential damage when trying to align with pre-marked workpieces.
Innovation Solution
A display device with visible pointers indicating the front and rear ends of the imaginary cutting line, featuring adjustable latching positions corresponding to different cutting depths, allows users to align the saw accurately without direct visual feedback of the saw blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a closed saw blade cover is used to facilitate chip extraction and reduce dust formation, then chip extraction and dust reduction are improved, but the visibility of the saw blade position deteriorates
Solution Approach 1:
The patent introduces an intermediary indicator system that mediates between the closed saw blade cover and the user's need for visibility. The indicator consists of a visible portion that moves with the saw blade and indicates its position on the workpiece surface, allowing users to monitor blade position without opening the cover or directly viewing the blade.
Solution Approach 2:
The patent creates a visual copy or representation of the saw blade position through the indicator system. The indicator replicates the positional information of the actual blade by moving in correspondence with blade depth adjustments and plunge movements, providing indirect visual feedback that mimics direct blade visibility.
2Adaptability or versatility
If the cutting depth is adjusted to change the length of the cut, then cutting versatility is improved, but the accuracy of saw blade position indication deteriorates due to lack of visual feedback
Solution Approach 1:
The patent implements a feedback mechanism where the indicator provides continuous visual information about the saw blade position in response to cutting depth adjustments. As the user adjusts the cutting depth or performs plunge cuts, the indicator moves correspondingly, providing real-time feedback that enables precise control and accurate positioning without direct blade visibility.
Solution Approach 2:
The patent enables preliminary positioning actions by allowing users to adjust the cutting depth and observe the indicator position before making the actual cut. Users can set the desired cutting depth, verify the indicator shows the correct position, and then proceed with confidence, performing the precise cutting action only after preliminary verification.
3Object-affected harmful factors
If direct visual feedback of the saw blade is blocked by the closed cover, then safety and dust reduction are improved, but the user's ability to align with pre-marked workpieces deteriorates
Solution Approach 1:
The indicator serves as an intermediary that transfers positional information from the hidden saw blade to the visible workspace. It allows users to align with pre-marked workpieces by providing visual reference points that correspond to the blade position, maintaining safety while enabling precise alignment.
Solution Approach 2:
The patent transitions the visualization from the vertical dimension (direct blade view) to the horizontal dimension (indicator position on or near the workpiece surface). By projecting the blade position information onto the workpiece plane, users can align accurately using the indicator's position rather than viewing the blade from above.
Data Source
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Figure 2
AI summary
The circular hand saw, particularly plunge saw or oscillating cap saw, has a saw blade (13) and a display device (11) which is visible from outside for a user. The position of a front end (15) or a rear end (17) of a virtual intersection lies between the saw blade and a working plane (19). The display device has an indicator (25,27) which shows the position of the front end or the rear end of the intersection. An independent claim is included for a display device for a saw blade with a circular hand saw, particularly a plunge saw or an oscillating cap saw.