Uniform Mandrel Pliers for Consistent Jewelry Wire Forming

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Solution Overview

Problem

Jewelers face challenges with tapered steel mandrels in replicating exact shapes and sizes consistently, as the taper causes material to stretch and makes it difficult to maintain uniformity, especially when producing multiple items, and the tools are awkward to handle and view.

Innovation Solution

The development of mandrel pliers with uniform cross-sectional areas and adjustable detent devices allows for consistent formation of various shapes and sizes, enabling multiple wraps and precise control over shape and size, and provides a secure grip without the need for starting with a closed metal ring or tube.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a tapered mandrel is used to form jewelry shapes, then the mandrel can be used to create various sizes of shapes, but the material stretches and the shapes cannot be replicated with exact consistency

Engineering Contradiction:

Improveability to create various sizes of shapesVSAvoidconsistency of shape and size replication

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The mandrel pliers incorporate a detent device that allows the jaws to be dynamically adjusted between multiple predetermined spacing positions. This enables the same mandrel to consistently form different sizes of shapes by selecting appropriate detent positions, while maintaining uniform cross-sectional area for consistent replication.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If a tapered mandrel is used to form multiple items, then the mandrel can produce different sized shapes, but each item must be formed one at a time and cannot be replicated exactly

Engineering Contradiction:

Improveability to produce different sized shapesVSAvoidefficiency of producing multiple items

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The detent device enables quick adjustment between predetermined spacing positions, allowing the jeweler to efficiently produce multiple items of the same size by simply resetting the jaw spacing to the same detent position, thereby improving productivity while maintaining size variation capability.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If a tapered mandrel is used to form bands, then the mandrel can create different sized bands, but the band must be frequently removed and flipped to prevent uneven sizing

Engineering Contradiction:

Improveability to create different sized bandsVSAvoidease of forming bands without flipping

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The mandrel pliers maintain a uniform cross-sectional area along the length of the jaws, eliminating the taper that causes uneven material distribution. This homogeneity allows bands to be formed consistently without requiring removal and flipping, as the uniform spacing ensures even sizing throughout the band formation process.

Inventive Principle:

Principle #33Homogeneity

4Shape

If a tapered mandrel is used to form shapes with sharp corners, then the mandrel can create angular shapes, but the shape becomes stretched beyond the desired circumference

Engineering Contradiction:

Improveability to create shapes with sharp cornersVSAvoidaccuracy of circumference control

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

The uniform cross-sectional area of the mandrel pliers jaws provides consistent spacing throughout the forming process, preventing the material from stretching beyond the desired circumference even when forming shapes with sharp corners. The parallel jaws maintain uniform pressure distribution that preserves dimensional accuracy.

Inventive Principle:

Principle #33Homogeneity

5Stability of the object's composition

If a tapered mandrel is used, then the mandrel can be placed in a vise for stability, but this makes it difficult to view the entire piece and is time-consuming

Engineering Contradiction:

Improvestability of the mandrel during useVSAvoidease of viewing and handling the mandrel

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The mandrel pliers are designed with handles that provide inherent stability and control during operation, eliminating the need for external vise support. The jeweler can easily hold and maneuver the pliers by hand, maintaining both stability and ease of viewing the entire piece during the forming process.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11235438B2Jewelry mandrel pliers and method of using same

Publication Date: 2022.02.01 WUBBERS LLC

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.