Adjustable Sawhorse with Discontinuous Support Surface
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Solution Overview
Problem
Existing sawhorses are inconvenient for accurate cutting of large boards or sheets as they require frequent repositioning to avoid cutting the support surface, leading to inaccuracy and potential material tearing, especially during longitudinal cuts.
Innovation Solution
An adjustable sawhorse trestle with a discontinuous supporting surface, featuring split or hinged members that can be locked in various positions to accommodate saw blades and adjust to different board sizes, allowing continuous cutting without repositioning and providing additional securing means for stable support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a continuous supporting surface is used, then the sawhorse provides stable support for workpieces, but the saw blade cannot pass through without repositioning the workpiece
Solution Approach 1:
The supporting surface is divided into separate segments with a gap between them, allowing the saw blade to pass through without requiring the workpiece to be repositioned. This segmentation resolves the contradiction by enabling continuous cutting while maintaining support stability.
Solution Approach 2:
The supporting surface segments are made adjustable rather than fixed, allowing the gap size and position to be modified based on cutting requirements. This dynamic adjustment capability enables the sawhorse to adapt to different workpiece sizes and cutting configurations.
2Adaptability or versatility
If the supporting surface is made discontinuous with fixed gaps, then the saw blade can pass through, but the sawhorse cannot adapt to different workpiece sizes
Solution Approach 1:
The supporting surface segments are designed to be adjustable relative to each other, allowing the gap size and position to be modified. This dynamic configuration enables the same sawhorse structure to accommodate various workpiece sizes and cutting configurations without requiring multiple specialized tools.
Solution Approach 2:
The adjustable supporting surface creates a universal sawhorse that can handle multiple cutting scenarios (different board widths, lengths, and cutting positions) with a single device, eliminating the need for multiple specialized sawhorses for different workpiece sizes.
3Reliability
If large boards are supported on a fixed sawhorse, then the setup is simple, but the material may tear as the cut nears completion
Solution Approach 1:
The discontinuous supporting surface creates a gap that allows the saw blade to pass completely through the workpiece without contacting the supporting surface. This prevents the blade from catching or tearing the material as the cut nears completion, eliminating the need for operator intervention to prevent damage.
Solution Approach 2:
The gap in the supporting surface acts as an intermediary space that allows the saw blade to complete its cutting path without interference from the support structure, preventing material tearing while maintaining continuous support for the workpiece.
4Adaptability or versatility
If the sawhorse structure is made adjustable with movable segments, then it can accommodate different workpiece sizes, but the structural complexity increases
Solution Approach 1:
The supporting surface segments are designed with simple adjustment mechanisms that allow easy reconfiguration of the gap size and position. The dynamic nature of the structure enables adaptability to different workpiece sizes while keeping the adjustment mechanisms straightforward and intuitive.
Solution Approach 2:
Rather than making the entire sawhorse structure adjustable, only the supporting surface segments are made movable, providing the necessary adaptability for different workpiece sizes while minimizing the overall structural complexity and maintaining simplicity in other aspects of the design.
Data Source
Figure 1~2
Figure 3~4
AI summary
A sawhorse trestle has a discontinuous work-surface which is adjustable so as to provide a variable aperture between respective parts (2, 12) of the work-surface. Thus, the trestle may comprise two half-trestles (10, 20), each comprising two hinged frames (1, 11) topped by a horizontal support member (2, 12) providing part of the work-surface, those half trestles (10, 20) being connected by adjustable, such as slideable, connecting means (3).