Pinless Orthodontic Pliers Hinge With Arcuate Blades
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Solution Overview
Problem
Existing orthodontic pliers with pinless hinges face issues with secure retention of separable parts, as they tend to separate beyond a certain opening limit and experience uneven wear, leading to instability and potential damage.
Innovation Solution
The design incorporates a hinge system with arcuate blades and grooves, where the blades engage the grooves at a limited extent to secure the parts and disengage beyond that limit, allowing for secure assembly and disassembly, featuring a male and female hinge portion with a central protrusion and recess for enhanced retention, and an optional spring arm and hook mechanism for additional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pinless hinge with dovetail arrangement is used to join pliers parts, then the pliers can be separated easily, but the parts separate beyond a certain opening limit and the hinge surfaces wear due to squeezing
Solution Approach 1:
The hinge is divided into two functional components: a pin component with a cylindrical shaft and a recess, and a slot component with a slot that receives the pin. This segmentation allows the hinge to provide both secure retention during use and easy separation when needed, resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The hinge transitions from a static connection to a dynamic one where the pin can move within the slot. During normal use, the pin is constrained within the slot to provide secure retention. When separation is needed, the pin can be deliberately moved out of the slot, enabling easy disassembly. This dynamic behavior resolves the contradiction between maintaining secure retention and enabling easy separation.
2Ease of manufacture
If a pinless hinge with dovetail arrangement is used, then assembly is simple, but the dovetail surfaces wear due to squeezing of handles
Solution Approach 1:
The hinge is segmented into a pin component and a slot component, replacing the monolithic dovetail arrangement. This segmentation distributes the contact surfaces and reduces concentration of wear on single dovetail surfaces, thereby improving durability while maintaining assembly simplicity.
Solution Approach 2:
The pin acts as an intermediary element between the two pliers parts, providing a controlled connection point. This intermediary mechanism reduces direct squeezing forces on the hinge surfaces by distributing them through the pin-slot interaction, thereby reducing wear and improving durability.
3Reliability
If overhanging shoulders are used to prevent separation of pliers parts, then retention is improved, but the parts cannot be separated beyond a limited extent
Solution Approach 1:
The hinge provides a dynamic solution where the pin can be constrained within the slot during normal use to provide secure retention, and deliberately moved out of the slot when separation is needed. This dynamic mechanism allows the pliers to achieve both secure retention and extended opening capability, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The pin can be extracted from the slot when separation is needed, allowing the pliers parts to be separated beyond the limited extent imposed by fixed overhanging shoulders. This extraction mechanism provides the necessary adaptability while maintaining secure retention during normal use through the pin-slot engagement.
Data Source
AI summary
A two piece orthodontic pliers having a pair of arms separably hinged together, in which a first hinge portion on a first arm includes a shaft having a central, axially projecting protrusion, and a second hinge portion on a second arm includes a bore having a central recess for receiving the shaft and the central protrusion of the first hinge portion.