Adjustable Square With Stepwise And Stepless Angle Adjustment
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Solution Overview
Problem
Existing adjustable squares either lack the ability to set angles steplessly or are limited to fixed positions, failing to provide the versatility needed for both precise stepwise and stepless adjustments in carpentry applications.
Innovation Solution
A stepwise and stepless adjustable square design featuring a rotatable blade with a spring device and a manually operable knob that allows for both stepwise and stepless adjustments by aligning and separating alignment structures, enabling the blade to be set to multiple distinct positions and any angle through frictional engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an adjustable square uses an indexing mechanism with profiled plates and spring member for stepwise adjustment, then the square can be locked at specific angles, but the square cannot be set to any arbitrary angle
Solution Approach 1:
The alignment mechanism is segmented into two distinct systems: an indexing mechanism with profiled plates for stepwise angular adjustment and locking, and a friction-based clutch mechanism for continuous arbitrary angle setting. This segmentation allows each subsystem to optimize its specific function while working together to provide both precision and versatility.
Solution Approach 2:
The blade assembly is designed with multi-functionality to serve dual purposes: it can engage with the indexing mechanism for precise angular positioning and locking, or disengage to allow free rotation for arbitrary angle setting. This universal design enables the same component to provide both stepwise and continuous adjustment capabilities.
2Adaptability or versatility
If a bevel square allows stepless adjustment by pivoting the blade, then any angle can be set, but the blade cannot be locked at specific positions
Solution Approach 1:
The friction clutch mechanism acts as an intermediary between the blade and the stock, allowing controlled slippage for smooth angular adjustment while providing sufficient friction to maintain position. This intermediary element enables the transition between free rotation for angle selection and controlled positioning for measurement.
Solution Approach 2:
The traditional mechanical locking screw system is replaced with a friction-based clutch mechanism that provides stepless adjustment through controlled friction. This substitution eliminates the need for discrete locking positions while maintaining the ability to hold arbitrary angles through frictional engagement.
3Adaptability or versatility
If an adjustable square combines both stepwise and stepless adjustment mechanisms, then versatility is improved, but device complexity increases
Solution Approach 1:
The indexing mechanism and friction clutch mechanism are merged into a single integrated assembly where the blade connects to both systems. The profiled plates for indexing are positioned adjacent to the friction clutch, allowing both mechanisms to operate from the same rotational movement of the blade without requiring separate adjustment systems.
Solution Approach 2:
The friction clutch mechanism is designed to automatically engage and disengage based on the applied torque and user input. When the user applies force to rotate the blade, the clutch naturally transitions between locked and free states, eliminating the need for separate control mechanisms for each adjustment mode.
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
The square offers enhanced versatility, allowing users to set precise fixed angles and arbitrary angles, making it suitable for various carpentry tasks such as building and transferring roof pitches, with a compact and easy-to-manufacture design.
Implementation Method 1
a spring device for axially pressing the second alignment structure towards the first alignment structure
Implementation Method 2
a first surface associated with the blade is brought into frictional engagement with a second surface associated with the stock for stepless adjustment
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The present invention relates to a stepwise and stepless adjustable square (10), comprising: a stock (12); a blade (14); a first alignment structure (28a); a second alignment structure (28b); a spring device (36); and a knob (38) movable between a first position and a second position, wherein in the first position the first and second alignment structures at certain angles between the stock and the blade align and engage such that a force of the spring device is reduced compared to the force at angles where the first and second alignment structures do not align for stepwise adjustment, and wherein in the second position the second alignment structure (28b) is moved axially away from the first alignment structure (28a), whereby the first and second alignment structures are separated from each other, and a first surface (62) associated with the blade is brought into frictional engagement with a second surface (64) associated with the stock for stepless adjustment.