Chain Shackle Segmented Halves for Hoist Chain Locking
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Solution Overview
Problem
Existing chain hoist locking mechanisms, particularly those using pins, face issues with high bending stress, incorrect positioning during chain changes, and unfavorable surface pressure due to point contact, leading to potential safety hazards and inefficiencies.
Innovation Solution
A chain shackle comprising two identical shackle halves that form spaces to securely lock chain loops, reducing bending stress and providing a larger surface contact area, allowing for correct installation and versatile use across different hoist configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin is used to lock the chain loop, then the chain can be secured to the hook cylinder, but the pin is subjected to high bending stress and may fail due to incorrect positioning or notches
Solution Approach 1:
The chain shackle is divided into two identical shackle halves that are installable against each other, creating a segmented structure that eliminates the need for a separate pin while maintaining secure chain locking
Solution Approach 2:
Instead of using a pin that passes through the chain loop and supports itself against the hook cylinder, the invention inverts the approach by having the shackle halves form the locking structure directly, with the chain loop passing through the formed space
2Strength
If a pin with large diameter is used to reduce bending stress, then the pin strength increases, but it cannot be pushed through the chain loop
Solution Approach 1:
The shackle is segmented into two halves that can be installed separately and then joined together, allowing the chain loop to pass through the formed space without requiring a large-diameter pin to be forced through
Solution Approach 2:
The shackle halves create a three-dimensional space that the chain loop can pass through, transitioning from a linear pin insertion approach to a spatial configuration that accommodates the chain loop
3Reliability
If a pin is used for chain locking, then the chain can be secured, but the surface pressure between the chain loop and pin is unfavorable due to point contact
Solution Approach 1:
The shackle is divided into two halves that create an extended contact surface with the chain loop, transforming the point contact of a pin into a distributed surface contact that reduces stress concentration
4Reliability
If multiple different locking elements are used for different chain locking locations, then each location can be optimized, but the device complexity increases
Solution Approach 1:
The chain shackle with two identical halves is designed to be universally applicable in all locations requiring chain locking, including the hook cylinder, chain hoist frame, and chain bag, eliminating the need for multiple different locking elements
Solution Approach 2:
The invention merges the function of multiple different locking elements into a single standardized chain shackle design that can be used in all chain locking locations, reducing device complexity
Data Source
Figure 1a~1g
Figure 2a~2b
Figure 3a~3c
AI summary
The invention relates to a chain shackle for fastening a hoist chain of a chain hoist to a hoisting member or the chain hoist. The chain shackle comprises two identical shackle halves (1a) installable against each other to work together in such a manner that they form between them a first space (A) for one chain loop or chain loop half of the hoist chain to lock it against the hoisting direction or force, the first space being open in a first direction in the longitudinal direction of the chain shackle, and a second space (B) connected to the first space and intended for a second hoist chain loop that is coupled with the first chain loop or is to be coupled with a chain loop half, the second space being open in both longitudinal directions of the hoist chain.