Jewelry Hinge Assembly with Leaf Spring Biasing
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Solution Overview
Problem
Conventional hinges for rigid jewelry are often bulky, prone to failure, and do not securely retain the jewelry on the user, while attempts to minimize bulk result in delicate designs that fail to withstand usage.
Innovation Solution
A spring-biased hinge assembly with a leaf spring mechanism that always urges the cuff into a closed position, allowing for a low-profile design that reduces wear and tear, and incorporates a track element and stopper pin to limit rotation, enhancing durability and aesthetic integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conventional hinge assembly is used for rigid jewelry, then the jewelry can be opened and closed, but the hinge assembly becomes bulky and protrudes from the piece breaking the intended aesthetic
Solution Approach 1:
The hinge assembly is nested within a recess in the jewelry piece, with the arm and housing fitting inside the recess when closed. This nesting approach allows the hinge mechanism to be concealed within the jewelry's profile, eliminating protrusion while maintaining functionality.
Solution Approach 2:
The hinge assembly transitions from a protruding three-dimensional structure to a flush, recessed configuration by utilizing the recess depth dimension. The arm rotates within the recess plane, allowing the hinge to lie flat with the jewelry surface when closed.
2Volume of moving object
If the hinge assembly is designed to eliminate bulk, then aesthetics are improved, but the hinge assembly becomes too delicate and cannot withstand a suitable cycle of use before failure
Solution Approach 1:
The hinge components are designed with non-uniform cross-sections optimized for their specific functions: the arm has increased thickness at stress concentration points, the housing includes reinforcing ribs, and the connection interfaces feature keyed geometries. This localized strengthening provides durability without adding overall bulk.
Solution Approach 2:
The hinge assembly utilizes composite construction with the arm, housing, and track element made from durable materials that provide both strength and flexibility. The combination of these components creates a structurally robust assembly that resists fatigue while maintaining a compact form.
3Volume of moving object
If a delicate hinge assembly is used to maintain aesthetics, then bulk is reduced, but the hinge assembly cannot securely retain jewelry on a user
Solution Approach 1:
The hinge incorporates a spring mechanism that dynamically adjusts the retention force. The spring constant and pre-load are optimized to provide sufficient holding force to secure the jewelry on the user while allowing controlled opening when force is applied. This parameter optimization enables secure retention without requiring a bulky mechanical latch.
4Force
If a spring-biased hinge is used to secure jewelry on a user, then retention is improved, but the hinge assembly becomes more complex
Solution Approach 1:
The spring mechanism is integrated into the existing hinge components rather than being a separate assembly. The spring is positioned within the housing and connects to the arm through the track element, merging the retention function with the rotational movement function. This integration reduces the number of discrete parts while maintaining the spring-biased retention capability.
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 solution provides a durable, low-profile hinge assembly that securely retains jewelry on the user, reduces fatigue, and maintains consistent operation throughout its lifespan, allowing for incorporation into various jewelry pieces without compromising aesthetics.
Implementation Method 1
A leaf spring is positioned in the channel of the housing, retained under the lip, and extends into the tunnel under the lower end of the well... the leaf spring positioned between the arm and the housing operates to bias the first end of the housing toward the arm and thereby always urge the cuff into a close position
Data Source
AI summary
A piece of jewelry includes a hinge assembly that always biases two rigid portions to rotate relative to each other toward a closed secure position. The jewelry includes a leaf spring that biases a spring housing to rotate and thereby in turn rotate the two rigid portions relative to each other. The jewelry includes a pin in slot system which limits movement of the hinge to maximum predetermine opening angle.