Pivotable Guard Member for Table Saw Motor Access
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Solution Overview
Problem
Existing table saw designs have an air gap between the enclosure and the table top that allows users to access internal components, posing a safety risk as they can reach inside this gap and potentially touch internal parts.
Innovation Solution
The implementation of moveable guard members that pivot about a perpendicular axis to the saw blade axis, which are biased by torsion springs to contact the blade case or table top, preventing access to internal components when the motor is moved up, down, or tilted, thereby obstructing the interior space of the blade case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed guard system is used, then safety is improved, but adaptability to motor movement is worsened
Solution Approach 1:
The guard system transitions from a fixed structure to a dynamic one that moves with the motor. The guard members are coupled to the motor assembly through linkages that allow the guards to follow the motor's vertical and bevel movements, maintaining continuous protection while adapting to position changes.
Solution Approach 2:
Linkage mechanisms serve as intermediaries between the motor assembly and the guard members. These linkages transmit the motor's movement to the guards, ensuring they remain positioned to obstruct access to internal components regardless of motor position.
2Adaptability or versatility
If the guard system is made moveable to follow motor movement, then adaptability is improved, but device complexity is worsened
Solution Approach 1:
The guard system is integrated with the motor assembly through shared linkages and mounting points. The guard members utilize the same structural elements and movement paths as the motor, combining multiple functions into a unified system that reduces overall complexity.
Solution Approach 2:
The linkage mechanisms serve multiple functions: they support the motor assembly, transmit movement to the guards, and provide structural support for the guard members. This multi-functionality eliminates the need for separate mechanisms, reducing device complexity.
3Reliability
If the air gap is reduced to prevent access, then safety is improved, but ease of operation is worsened
Solution Approach 1:
The guard members are designed to be dynamically positioned rather than permanently fixed. They can be moved away from their obstructing positions when motor access is required, allowing maintenance operations while maintaining safety during normal operation.
Solution Approach 2:
The guard system automatically returns to its protective position after being moved for maintenance. Spring mechanisms or gravity-assisted return systems enable the guards to self-reposition without requiring manual intervention, maintaining safety after user interaction.
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
Effectively limits user access to internal components of the table saw across various positions of the motor, enhancing safety by maintaining obstruction even during vertical and bevel movements, thus preventing accidental contact with internal parts.
Implementation Method 1
at least one pivotable guard member positioned between the table top and the blade case... a torsion spring configured to bias the pivotable guard member to contact the blade case or the table top
Data Source
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AI summary
A table saw (1) is disclosed. The table saw includes a table top (2) including an opening (4) configured to receive a saw blade (6), a blade case (260) positioned under the table top, the blade case (260) including an interior portion with the saw blade (6) partially positioned within the interior portion, the blade case configured to move relative to the table top, a motor coupled to the saw blade and configured to move relative to the table top (2), the saw motor configured to rotate the blade about a blade axis, and at least one moveable guard member (182) positioned between the table top (2) and the blade case (260), the at least one moveable guard member providing an obstruction to the interior portion of the blade case (260), and the at least one moveable guard member (182) configured to pivot about a pivot axis when the motor is moved up or down or tilted relative to the table top, wherein the pivot axis is substantially perpendicular to the blade axis.