Turnbuckle Lashing Head With Safety Pin for Breakage Control
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Solution Overview
Problem
Existing lashing tools for securing container stacks on vessels are prone to material failure under high stress, posing safety risks to users due to sudden breakage and potential injuries.
Innovation Solution
A container lashing device with a rigid safety pin integrated into the head, allowing for a gap between the pin and its bore to absorb load in case of material fatigue, preventing complete breakage and enhancing user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a rigid lashing tool is used to tighten/untighten turnbuckles under high stress, then the tool can effectively perform the lashing operation, but the tool is prone to material failure and breaking
Solution Approach 1:
The head of the lashing device is divided into multiple parts (first head part, second head part, third head part) that can separate from each other upon material failure. This segmentation ensures that when one part fails, the other parts remain intact and can still provide support, preventing complete tool failure and protecting the user.
Solution Approach 2:
The invention incorporates a gap between the first head part and the body, as well as between the third head part and the body, to absorb energy and reduce stress concentration. This beforehand cushioning design prevents sudden catastrophic failure by allowing controlled movement and stress distribution before any potential breakage occurs.
2Strength
If the head is designed as a single solid piece for strength, then it can withstand high stress, but any material failure results in complete breakage and safety hazards
Solution Approach 1:
The head is segmented into multiple parts that can separate upon failure. The first head part, second head part, and third head part are designed to detach from each other, ensuring that material failure does not result in complete breakage but rather controlled separation, reducing the harmful effects of failure.
Solution Approach 2:
Gaps are intentionally designed between head parts and the body to absorb energy and prevent stress concentration. This beforehand cushioning ensures that even under extreme stress, the head parts will not completely shatter but will separate in a controlled manner, protecting the user from injury.
3Ease of manufacture
If the head is made as one integrated component for simplicity, then manufacturing is easier, but safety against complete breakage is reduced
Solution Approach 1:
The head is manufactured as separate parts (first head part, second head part, third head part) that are assembled together. While this increases manufacturing steps slightly, it significantly improves safety by ensuring that material failure results in controlled separation rather than complete breakage, achieving better reliability.
Data Source
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AI summary
Container lashing device for tightening and/or untightening a turnbuckle tensioning a lashing cable, the lashing device including a body and a head fixedly connected to the body, wherein the head includes a first portion substantially in line with the body and a second portion which is at an angle to a centre line of the body, the second portion of the head being configured to be inserted into the turnbuckle.