Twisted Lashing Hook Geometry for Secure Underhook Engagement
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Solution Overview
Problem
Existing lashing methods for securing cargo, such as automobiles, on ships face challenges in preventing positional deviation due to forces acting on the lashing target during transportation, particularly when the ship tilts, leading to strap loosening and potential hook detachment from the eye-bolt, especially when the hook is hooked from below, and require difficult operational maneuvers.
Innovation Solution
A lashing method featuring a lashing hook with a curved portion that provides a twist in the Z-direction, increasing the opening distance and generating additional frictional resistance, allowing the hook to maintain engagement with the eye-bolt even when hooked from the lower side, and applying tension along the centerline of the belt to prevent positional deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lashing hook is hooked from below to the loop portion, then the operation becomes easier, but the hook may detach due to its own weight when the strap loosens
Solution Approach 1:
The patent inverts the conventional hooking direction from above to below, allowing the hook to be attached from the lower side. This is made possible by the inverted V-shaped configuration where the lower arm extends downward and the hook portion is positioned to engage the loop from below, reversing the traditional approach while maintaining security
Solution Approach 2:
The hook portion is designed with a curved configuration forming an inverted V-shape, where the curved arms create a geometric structure that naturally engages the loop portion. The curvature of the hook arms provides mechanical interlocking that prevents detachment even when the strap loosens during ship tilting
2Reliability
If the lashing hook is fastened from the upper side to the loop portion, then the hook remains securely latched, but the lashing operation becomes more difficult
Solution Approach 1:
The patent inverts the conventional hooking direction from above to below, allowing the hook to be attached from the lower side. This is made possible by the inverted V-shaped configuration where the lower arm extends downward and the hook portion is positioned to engage the loop from below, reversing the traditional approach while maintaining security
3Object-affected harmful factors
If the ship tilts during transportation, then cargo must be secured against positional deviation, but the strap loosens and hook may detach
Solution Approach 1:
The inverted V-shaped configuration creates preliminary geometric constraints that prevent hook detachment before it can occur. The angular geometry and frictional engagement are designed to counteract the loosening force generated during ship tilting, maintaining secure engagement under dynamic conditions
Solution Approach 2:
The hook portion is designed with a curved configuration forming an inverted V-shape, where the curved arms create a geometric structure that naturally engages the loop portion. The curvature of the hook arms provides mechanical interlocking that prevents detachment even when the strap loosens during ship tilting
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 lashing hook effectively prevents detachment from the eye-bolt by increasing frictional resistance and allowing easier operation from the lower side, reducing labor and maintaining stability during transportation, even under varying conditions such as tilting and elevation changes.
Implementation Method 1
A lashing method featuring a lashing hook with a curved portion that provides a twist in the Z-direction, increasing the opening distance and generating additional frictional resistance
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
It is an object of the present invention to provide a lashing hook which can be used in a state where the lashing hook is hooked to a fixing member from below. The lashing hook (12) includes a hook portion (34) hooked to a fixing member of a lashing target, and a body portion (36). The body portion (36) includes a connecting portion (50) for connecting a belt for transmitting tension. The hook portion (34) includes a base portion (38), a curved portion (42), and a tip portion (40). The curved portion (42) has an opening (44) between the base portion (38) and the tip portion (40) while having a space (46) for accommodating the fixing member inside the opening (44). When the direction in which the body portion (36) and the vicinity of the base portion (38) have their thickness is the Z direction, the curved portion (42) has a bend in the Z direction so as not to overlap the Z directional position of the tip portion (40) and the Z directional position of the base portion (38).