Uniform Mandrel Pliers for Consistent Jewelry Shaping
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Solution Overview
Problem
Tapered steel mandrels used in jewelry fabrication are challenging for producing exact sizes and shapes, as they cause material stretching and require repetitive flipping, making it difficult to maintain uniformity and visibility during the shaping process.
Innovation Solution
A pair of pliers with mandrel jaws of uniform cross-sectional area, allowing for consistent shaping of various shapes like squares, triangles, and ovals, enabling multiple identical shapes to be produced without starting with a closed ring, and allowing easy grip and visibility during the forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tapered mandrel is used for shaping jewelry, then various sizes of shapes can be fabricated using a single mandrel, but the material tends to stretch and the resulting shapes are of slightly different sizes
Solution Approach 1:
The mandrel is divided into multiple sections along its length, with each section having a different diameter. This segmentation allows the wire to be positioned at different locations on the mandrel to create shapes of various sizes, while each section maintains a uniform diameter to prevent stretching and ensure consistent sizing.
Solution Approach 2:
Different sections of the mandrel have different diameters (local variation in quality) to accommodate various shape sizes, but each local section maintains uniform diameter quality to prevent material stretching. This local quality approach resolves the contradiction between versatility and precision.
2Ease of manufacture
If a tapered mandrel is used to form bands, then the band can be shaped, but the band must be frequently removed and flipped to prevent one side from becoming larger
Solution Approach 1:
The mandrel is segmented into multiple uniform sections along its length. When forming a band, the jeweler can wrap the band around different sections without needing to flip or reposition the mandrel, as each section provides the same circumference. This eliminates the time-consuming flipping process while maintaining ease of band formation.
Solution Approach 2:
The mandrel is pre-configured with multiple uniform sections before the band-forming process begins. This preliminary arrangement of uniform sections allows the jeweler to directly wrap and form bands without intermediate flipping or repositioning steps, reducing time loss.
3Shape
If a tapered mandrel is used to produce shapes with sharp corners, then the shape can be formed, but the shape is stretched beyond the desired circumference
Solution Approach 1:
The mandrel is segmented into uniform sections, allowing the wire to be positioned precisely at the desired location. The uniform diameter ensures that when sharp corners are formed by hammering, the material does not stretch beyond the intended circumference, maintaining precision while achieving the desired shape.
Solution Approach 2:
The mandrel design changes the diameter parameter along its length (different sections have different diameters) while maintaining uniformity within each section. This parameter variation allows creation of different shape sizes and sharp corners, while the local uniformity prevents unwanted stretching and maintains circumference accuracy.
4Ease of operation
If a tapered mandrel is held in a vise, then the mandrel is secured, but it is difficult to obtain a good view of the entire piece and the process is time consuming
Solution Approach 1:
The pliers are designed with multiple functions: the handles provide gripping capability while the jaws incorporate mandrel sections for shaping. This multi-functionality eliminates the need for separate vise equipment, allowing the tool to be self-contained and manipulated freely for optimal viewing angles without time-consuming repositioning.
Solution Approach 2:
The pliers provide dynamic positioning capability, allowing the jeweler to freely rotate and reposition the tool during operation. This dynamic manipulation enables continuous viewing of the work from different angles without the static constraints of a vise, reducing time loss while maintaining operational stability.
Data Source
AI summary
The present invention provides a mandrel tool and method for more efficiently and consistently forming various shapes of material. In one embodiment of the invention, a pair of pliers having mandrel jaws that are shaped with a uniform cross sectional area throughout a length of the mandrel jaw is used to replace the traditional tapered mandrel. Because the mandrel jaws have a uniform cross sectional area, the wire, for example, can be wrapped multiple times around the mandrel jaw when it is desired to produce multiples of the same shape. For added versatility, the pliers can have opposing mandrel jaws, with different size cross sectional area.