Cammed Throat Plate Locking for Tool-Free Table Saw Access
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Solution Overview
Problem
Table saws, particularly jobsite table saws, face challenges in quickly and easily removing and reinstalling the throat plate without the need for additional tools, and often require screws that can be difficult to manage, leading to delays and potential loss.
Innovation Solution
A camming device is integrated into the workpiece support surface, featuring a rotatable body with a stem and biasing element, allowing for tool-free removal and installation of the throat plate using a knob system with finger holes for leverage, and a tab structure for secure alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If screws are used to attach the throat plate, then the throat plate can be removed and reinstalled, but additional tools are needed and the screws can be easily dropped into the throat plate opening
Solution Approach 1:
The camming device integrates the fastening mechanism directly into the throat plate assembly. The camming device includes a camming portion that engages with the workpiece support surface and a body portion that can be rotated to secure or release the throat plate. This merging eliminates the need for separate screws and tools, as the camming device itself performs both the fastening and releasing functions.
Solution Approach 2:
The camming device is designed to be operated directly by the user through rotation of the body portion, which self-secures the throat plate to the workpiece support surface. The biasing element provides automatic engagement force, and the camming geometry converts rotational motion into securing force without requiring external tools or additional components.
2Reliability
If screws are used to attach the throat plate, then the throat plate can be secured, but the screws are small and easily dropped into the throat plate opening making them difficult to retrieve
Solution Approach 1:
The camming device integrates the fastening mechanism directly into the throat plate assembly. The camming device includes a camming portion that engages with the workpiece support surface and a body portion that can be rotated to secure or release the throat plate. This merging eliminates the need for separate screws and tools, as the camming device itself performs both the fastening and releasing functions.
3Adaptability or versatility
If a tool is needed to turn the screws, then the throat plate can be removed, but there is an undesired delay in switching the shaping device if the tool is misplaced
Solution Approach 1:
The camming device is designed to be operated directly by the user through rotation of the body portion, which self-secures the throat plate to the workpiece support surface. The biasing element provides automatic engagement force, and the camming geometry converts rotational motion into securing force without requiring external tools or additional components.
Solution Approach 2:
The camming device is divided into functional portions: a camming portion that engages with the workpiece support surface, a body portion that is rotated by the user, and a biasing element that provides engagement force. This segmentation allows each component to perform its specific function efficiently, with the body portion serving as a built-in operating interface that eliminates the need for external tools.
4Ease of manufacture
If screws are used to attach the throat plate, then the throat plate can be attached within the well, but the screws require additional tools and create potential for loss
Solution Approach 1:
The camming device integrates the fastening mechanism directly into the throat plate assembly. The camming device includes a camming portion that engages with the workpiece support surface and a body portion that can be rotated to secure or release the throat plate. This merging eliminates the need for separate screws and tools, as the camming device itself performs both the fastening and releasing functions.
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
Enables quick and secure removal/installation of the throat plate without loose parts, reducing delays and improving user convenience while maintaining secure fastening.
Implementation Method 1
a biasing element positioned on the stem at a location beneath the workpiece support surface and configured to bias the body portion against the workpiece support surface
Implementation Method 2
a camming device configured to secure the throat plate to the workpiece support surface. The camming device includes a body portion and a stem portion
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A power tool assembly includes a workpiece support surface, a throat opening defined in the workpiece support surface, an arbor shaft configured to support a shaping device, the arbor shaft positioned beneath the workpiece support surface and accessible through the throat opening, and a camming device rotatably mounted at a location adjacent to the throat opening, the camming device including a first camming surface portion configured to cam against a second camming surface potion of a throat plate inserted into the throat opening, thereby locking the throat plate within the throat opening.