Trapezoidal Clamping Post for Woodworking Fence Attachment
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Solution Overview
Problem
Existing clamping devices for woodworking apparatuses, such as auxiliary fences and boards, face limitations in size due to manufacturing costs and weight, and often require non-standardized T-shaped channels that can compromise structural integrity or fail to provide a flush surface for larger work pieces.
Innovation Solution
A multi-purpose utility clamp with a clamping post having a trapezoidal cross-sectional shape that can be inserted into corresponding channels, allowing for secure attachment of auxiliary components to woodworking apparatuses without compromising structural integrity, and enabling the use of taller fences for larger work pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If T-shaped channels are cut deeply to receive clamping posts, then the clamp attachment is secured, but the structural integrity of the work surface is compromised
Solution Approach 1:
The patent changes the geometric parameters of the channel cross-section from a traditional T-shape to a modified shape with rounded corners and specific dimensional ratios. The channel has a width W and depth D where D is between 0.25 to 0.5 inches, and the rounded corners have radius R between 0.06 to 0.12 inches. These parameter optimizations allow sufficient clamp engagement while preserving work surface strength by avoiding excessive depth cuts.
2Strength
If T-shaped channels are cut shallowly to preserve structural integrity, then the work surface strength is maintained, but the clamp attachment becomes unreliable due to thin wood strips
Solution Approach 1:
The patent optimizes the channel depth parameter D to be between 0.25 to 0.5 inches, which is sufficient to provide reliable clamp engagement without creating overly thin wood strips. The rounded corner radius R of 0.06 to 0.12 inches further strengthens the channel geometry by eliminating stress concentration points, allowing the channel to maintain both structural integrity and clamping reliability at moderate depths.
Solution Approach 2:
The patent specifies that channels should be routed in hardwoods with minimum Janka hardness of 1000 lbf, such as maple, oak, or walnut. This material selection ensures that the wood has sufficient density and strength to maintain structural integrity while providing reliable engagement for clamping posts, effectively using material properties to compensate for moderate channel depths.
3Manufacturing precision
If extruded metal fences are used for auxiliary fences, then manufacturing precision and durability are improved, but weight and manufacturing cost increase
Solution Approach 1:
The patent promotes the use of hardwood boards with routed channels as alternative to extruded metal fences. While wood requires periodic replacement compared to durable metal, it offers significant advantages in weight reduction and cost. The standardized channel dimensions (width W, depth D between 0.25-0.5 inches) ensure adequate service life while maintaining affordability and light weight for auxiliary fences.
4Reliability
If non-standardized T-shaped channels are used, then clamp engagement is achieved, but ease of manufacture decreases due to lack of standardization
Solution Approach 1:
The patent establishes universal standardized channel dimensions that can be used across different hardwood species and fence configurations. The standard parameters include width W, depth D between 0.25 to 0.5 inches, and rounded corner radius R of 0.06 to 0.12 inches. This standardization allows the same routing bit and procedures to be used for creating channels in various auxiliary fences, greatly improving ease of manufacture while maintaining reliable clamp engagement.
Data Source
AI summary
Embodiments of a multi-purpose utility clamp may include a component engagement member having a clamp head and a handle. A guide arm is operatively connected to the component engagement member at a first end of the guide arm. A first post is operatively connected to a second end of the guide arm to move linearly relative to the guide arm. A second post at an end of the support post is disposed generally perpendicular to the first post and has a first end connected to the first post and a second end, distal the first end, and the second end is disposed opposite the clamping head. The second post has a generally trapezoidal cross-sectional shape along a length thereof between the first end and the second end, and the second post is configured to be inserted into a channel having a corresponding trapezoidal shape and formed in an auxiliary component to be clamped to another component.