Carabiner Wire Gate with Variable Thickness
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Solution Overview
Problem
Existing carabiners face limitations in opening zone size and safety due to the use of a gate bar or wire of similar diameter to the body, which restricts handling and meets safety standards, and the presence of a hook at the end of the C-shaped body in some designs.
Innovation Solution
A carabiner with a steel wire gate of smaller diameter featuring a protuberance as the male latching element and an articulation loop at one end, combined with a compression spring and transfer stirrup for flexible return, allowing improved tensile strength and handling without increasing the body's cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate bar of similar diameter to the body is used, then the carabiner meets safety standards, but the opening zone is limited and handling becomes difficult
Solution Approach 1:
The gate is designed with non-uniform cross-section, being thickest at the latching point for maximum strength and gradually thinning towards the articulation loop. This local variation in thickness provides both safety at the critical latching point and ease of handling at the operating end, resolving the contradiction between reliability and ease of operation.
2Ease of operation
If a steel wire gate of smaller diameter is used, then handling and opening zone are improved, but tensile strength may be compromised
Solution Approach 1:
The wire gate features variable cross-sectional thickness along its length, with the maximum thickness located at the latching point where tensile strength is most critical. The wire gradually thins toward the articulation loop, providing ease of handling while maintaining strength where needed. This local quality variation resolves the contradiction between handling ease and tensile strength.
Solution Approach 2:
The gate wire's cross-sectional parameter (diameter/thickness) is changed along its length rather than remaining uniform. The wire is thickest at the latching point for maximum strength and thins toward the articulation loop for ease of handling, allowing the same component to satisfy both strength requirements and handling requirements through parameter variation.
3Strength
If a bar gate is used, then structural strength is maintained, but the carabiner presents a hook at the end of the body
Solution Approach 1:
The problematic hook formation at the end of the body is eliminated by extracting the function of the gate end from a solid bar and replacing it with an articulation loop made from wire. The wire gate's articulation loop provides the necessary structural connection without creating the harmful hook shape, resolving the contradiction between structural strength and hook formation.
4Ease of manufacture
If a rigid wire gate is used, then manufacturing cost is reduced, but ensuring flexural strength meeting safety standards becomes more difficult
Solution Approach 1:
The wire gate is manufactured with varying thickness along its length, being thickest at the latching point where flexural strength is most critical and gradually thinning toward the articulation loop. This local quality variation ensures that the simplest and least expensive wire forming process produces a gate that meets safety standards at the critical stress point while remaining manufacturable.
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 design enhances handling ease, manufacturing cost-effectiveness, and safety compliance by providing a larger opening zone and improved tensile strength through the combination of a secure latching system and flexible return mechanism.
Implementation Method 1
a flexible return device biasing the gate to the closed position
Implementation Method 2
The articulation loop rotates around the fixed swivel-pin when closing or opening of the gate are performed
Implementation Method 3
the protuberance at the opposite end is blocked by the female securing element of the body in the closed position
Data Source
AI summary
A carabiner equipped with a swivelling gate formed by a rigid metal wire of smaller diameter than that of the body. The wire is provided with a protuberance at one of the ends to form a male latching element and an articulation loop at the opposite end for passage of the swivel-pin. A flexible return device for returning the gate to the closed position comprises a compression spring operating in conjunction with an intermediate transfer stirrup inside a housing of the body.