Hook Closure Assembly Using a Locking Lynch Pin
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Solution Overview
Problem
Existing hook assemblies, particularly weld-on hooks, face issues with retaining chain links or cables within their openings due to disengagement or slippage, as the safety latch assemblies designed for grab hooks are not well-suited for weld-on hooks.
Innovation Solution
A hook assembly with a closure system utilizing a lynch pin and spring retainer, where the lynch pin has a protrusion that mates with a key slot in the hook body, providing a locking structure to prevent removal and ensuring the pin remains in a locked position, thereby retaining items within the hook opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple hook opening is used for easy chain insertion, then ease of operation is improved, but reliability of retention deteriorates due to chain disengagement or slippage
Solution Approach 1:
The hook assembly is segmented into the hook body and a separate closure system (lynch pin with spring retainer). The closure system can be independently operated to secure the chain, allowing easy insertion while providing reliable retention when closed.
Solution Approach 2:
The spring retainer is pre-loaded to automatically engage with the lynch pin when the closure system is assembled, creating a preliminary locking action that prevents chain disengagement before any load is applied.
2Reliability
If a closure system with lynch pin and spring retainer is added, then retention reliability is improved, but device complexity increases
Solution Approach 1:
The spring retainer is designed to automatically engage with the lynch pin without requiring additional fastening steps or tools. The system serves itself by using the spring's inherent elastic energy to create the locking action, reducing operational complexity.
Solution Approach 2:
The lynch pin and spring retainer are combined into a single closure system that works together as an integrated unit. The spring retainer is positioned to directly interact with the lynch pin, merging the locking and retaining functions into one cohesive mechanism.
3Reliability
If the lynch pin is designed with protrusion and key slot for locking, then retention reliability is improved, but ease of operation deteriorates due to rotation requirement
Solution Approach 1:
The protrusion and key slot are designed to automatically engage when the lynch pin is inserted, creating a preliminary locking action that prevents accidental disengagement. The spring retainer applies continuous pressure to maintain this engagement.
Solution Approach 2:
The lynch pin transitions from a static insertion component to a dynamic element that requires rotation for removal. This dynamic action ensures intentional operation, preventing accidental chain release while maintaining reliable locking during normal use.
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 prevents accidental dislodging of items from the hook opening by maintaining a secure closure mechanism, ensuring reliable retention of chain links or cables within the hook assembly.
Implementation Method 1
a spring retainer on the lynch pin serving to bias the lynch pin to a locked position
Data Source
AI summary
A hook assembly has a hook body with a shank portion and a free end portion defining a hook opening. The free end portion has a tip end with a through passage, and a key slot formed in the through passage. A removable pin is received in the through passage to substantially close an open side of the hook opening to retain items within the hook opening. The pin has a protrusion that mates with the key slot when the pin is rotated to a first position to allow the pin to be received in and removed from the through passage. The protrusion serves as a locking structure to prevent the pin from being removed from the through passage when the pin is rotated away from the first position. A spring retainer is arranged to keep the pin in its locked position.