Fixed Square Assembly with Reamed Holes for Angular Accuracy
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Solution Overview
Problem
Conventional methods for manufacturing fixed squares face challenges such as requiring accurate production equipment, difficulty in working with different materials, and potential loss of angular accuracy over time due to the triangular configuration of holes and pins.
Innovation Solution
The method involves providing pre-made holes in the blade and stock, enlarging them using a reamer, and attaching them with fastening elements like pins or rivets in a fixture to ensure precise alignment and strength, with the blade and stock being made of materials like stainless steel and anodised aluminium, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three holes are drilled through the blade and stock using conventional drilling, then the blade and stock can be joined, but the manufacturing precision is difficult to achieve due to tight tolerances and different materials
Solution Approach 1:
The patent applies preliminary action by providing pre-made holes in the blade and stock before assembly. These pre-formed holes eliminate the need for precise drilling during final assembly, allowing the components to be joined with simple alignment in the fixture without requiring high-precision drilling equipment or tight tolerances.
2Ease of manufacture
If drilling is performed on different materials (steel blade and plastic stock) with the same tool, then the manufacturing process is simplified, but the manufacturing precision deteriorates
Solution Approach 1:
The patent resolves this contradiction by pre-forming holes in each material separately using appropriate methods for each material type, then bringing the components together for assembly. This allows each material to be processed with its optimal method while maintaining overall process simplicity.
3Ease of manufacture
If three pins are inserted into drilled holes to join the blade and stock, then the components are attached, but the angular accuracy is lost over time due to wear and loosening
Solution Approach 1:
The patent applies merging by combining multiple attachment points (three or more attachment elements distributed across the blade-stock interface) into a unified attachment system. This distributed attachment approach prevents localized wear and loosening, maintaining angular accuracy over time while keeping the assembly process simple.
4Manufacturing precision
If the blade and stock are joined with small holes and pins, then the attachment is achieved, but the strength and durability of the square is insufficient
Solution Approach 1:
The patent applies composite materials by using a combination of attachment elements (such as pins, rivets, or screws) in conjunction with the pre-formed holes and fixture alignment system. This composite attachment approach provides both precision positioning and high strength, ensuring the square remains durable even when dropped from heights.
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
This approach reduces shavings, ensures accurate attachment, and results in a strong square that maintains angular accuracy even when dropped, with the enlarged holes and fastening elements providing enhanced durability.
Implementation Method 1
enlarging the at least three first and second holes while the blade and the stock are held in the fixture
Implementation Method 2
The pins may be secured by means of interference fit
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A method of manufacturing a fixed square (10), comprising: providing a blade (12) of the square, wherein the blade has at least three first holes (14a-c); providing a stock (16) of the square, wherein the stock has at least three second holes (18a-c) corresponding to the at least three first holes of the blade for attaching the blade and the stock to each other; holding the provided blade and stock in a fixture (17) in a right angle relationship where the at least three first holes of the blade align with the at least three second holes of the stock; enlarging the at least three first and second holes while the blade and the stock are held in the fixture; and attaching the blade and the stock to each other using fastening elements (20a-c) in the at least three enlarged first and second holes (14a'-c', 18a'-c') while the blade and the stock are held in the fixture. The present invention also relates to a fixed square.