Stepwise Adjustable Square 270-Degree Rotation
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Solution Overview
Problem
Existing stepwise adjustable squares in carpentry are limited in their adjustability, typically only allowing the blade to move up to less than 180 degrees, which restricts their usability, especially when working with thin items or transferring obtuse angles.
Innovation Solution
A stepwise adjustable square that allows the blade to rotate approximately 270 degrees relative to the stock, with a design featuring slots along the longitudinal edges and a rounded heel for improved usability and marking capabilities, along with alignment structures and a spring device for precise adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blade is limited to rotate less than 180 degrees relative to the stock, then the structure remains simple and compact, but the usability is restricted especially when working with thin items or transferring obtuse angles
Solution Approach 1:
The square transitions from a fixed configuration to a dynamically adjustable one, where the blade can rotate up to 270 degrees relative to the stock. The indexing mechanism enables dynamic reconfiguration between multiple angular positions (0°, 45°, 90°, 135°, 180°, 225°, 270°), allowing the tool to adapt to various working conditions including thin items and obtuse angles while maintaining structural integrity through controlled movement.
Solution Approach 2:
The rotation mechanism is segmented into discrete angular positions using an indexing system with detents orcams. This segmentation allows the blade to be positioned at specific angles (0°, 45°, 90°, 135°, 180°, 225°, 270°) rather than continuous rotation, simplifying the mechanism while providing sufficient versatility for different carpentry tasks including working with thin materials and transferring obtuse angles.
2Adaptability or versatility
If slots are provided along the complete longitudinal edges of the stock, then the blade can be received in all positions, but thin items such as sheet metal can enter into the slots and interfere with work
Solution Approach 1:
The slot configuration applies local quality by providing slots only where needed: the first longitudinal edge has a complete slot for full blade reception, while the second longitudinal edge has a slot only for a portion of its length. This selective slot placement allows the blade to be properly received in various positions while preventing thin items like sheet metal from entering and interfering with work on the second edge.
3Measurement precision
If the heel is made sharp for precise marking, then marking precision is improved, but the heel interferes when bearing against surfaces at 90-180 degree angles
Solution Approach 1:
The heel is designed with a rounded contour instead of a sharp edge, creating a curved surface that can bear against surfaces at various angles (90-180 degrees) without interference. This curvature allows the square to properly contact work surfaces while transferring obtuse angles, and the rounded heel can still provide adequate marking capability without the interference problems of a sharp heel.
Data Source
AI summary
A stepwise adjustable square for use in carpentry, including: a stock; and a blade rotatable relative to the stock around an axis of rotation between a first extreme position at zero degrees, where the blade is parallel to the stock and partly provided in a space of the stock, and a second extreme position at about 270 degrees, where the blade is substantially perpendicular to the stock.