Lashing device
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Solution Overview
Problem
Conventional lashing devices for securing containers on cargo ships are prone to damage and operator injury due to unevenly distributed forces and varying lashing rod angles, which can lead to container tilting and falling during unstable conditions.
Innovation Solution
A lashing device featuring a base seat with pivot lugs and an eye plate that allows for rotational movement about a pivot pin, with elongated holes and stoppers to equalize tension forces and prevent finger injury, using a configuration that maintains consistent lashing rod distances and absorbs impact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lashing devices are used to secure containers, then containers can be fixed to the deck, but the lashing rods and corner castings are easily damaged due to unevenly distributed forces during unstable conditions
Solution Approach 1:
The eye plate is designed to rotate about the pivot pin, allowing the lashing device to dynamically adjust to varying container positions and impact forces. This rotational capability enables the force to be distributed more evenly across the lashing rod and corner casting, preventing damage while maintaining secure container fixation during unstable ship conditions
Solution Approach 2:
The invention changes the geometric parameters of the eye plate, specifically the arrangement of the first and second elongated holes at different orientations. This allows the lashing rod to be positioned at optimized angles relative to the container corner casting, distributing the securing force more uniformly and reducing stress concentration on the lashing rod and corner casting
2Adaptability or versatility
If containers are secured at different heights causing lashing devices to incline at different angles, then containers can be secured at various positions, but the distance between lashing rods varies causing operator injury risk
Solution Approach 1:
The eye plate's rotational capability about the pivot pin allows it to adapt to different container heights and lashing angles dynamically. This ensures that the distance between adjacent lashing rods remains consistent regardless of the inclination angle, eliminating the pinching hazard to operators while maintaining the ability to secure containers at various positions
Solution Approach 2:
The first and second elongated holes are arranged asymmetrically at different orientations on the eye plate. This asymmetric configuration allows the lashing device to accommodate varying inclination angles while maintaining a constant distance between lashing rods, preventing finger pinching injuries during operation
3Ease of manufacture
If eye plates are welded to fixing seats with multiple circular holes, then lashing devices can be connected to the deck, but the eye plate is subjected to unevenly distributed forces
Solution Approach 1:
The eye plate rotates about the pivot pin to dynamically align with the direction of applied forces, ensuring that forces are distributed evenly across the pivot pin and base seat. This eliminates the uneven force distribution that occurs in conventional fixed eye plate configurations, while the pivot pin and base seat design maintains ease of installation
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 effectively distributes tension forces across lashing rods, preventing damage and operator injury, while maintaining consistent lashing rod distances and reducing installation costs by minimizing the welding area.
Implementation Method 1
The pivot pin movably extends through the pivot hole such that the eye plate is rotatable about the pivot pin relative to the base seat
Data Source
AI summary
A lashing device includes: a base seat having a bottom wall, and two pivot lugs which cooperate with the bottom wall to define a pivot slot thereamong, and each of which is formed with an pivot hole communicating with the pivot slot; a pivot pin extending through the pivot hole of each of the pivot lugs; and an eye plate received in the pivot slot, and having a middle portion that is formed with a pivot hole provided for the pivot pin to movably extends therethrough, and first and second wing portions which are connected to opposite ends of the middle portion, respectively, and each of which has an elongated hole having an arc section. The arc axes of the arc sections of the elongated holes are aligned with the center axis of the pivot hole.