Gated Snap Hook Assembly with Torsion Spring Locking
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Solution Overview
Problem
Existing fall protection equipment, such as snap hooks used in construction, often fail to securely anchor workers to anchor points like rebar, risking disengagement under forces, especially when the hook becomes horizontal.
Innovation Solution
A gated snap hook assembly with a complex torsion spring mechanism that biases the gate and trigger to closed positions, using a dual-purpose spring to lock the gate and trigger, preventing pivotal motion and ensuring secure attachment to anchor points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple snap hook is used to connect the retractable to the anchor, then the device complexity is reduced, but the reliability of the connection is insufficient and the hook may disengage under horizontal forces
Solution Approach 1:
The snap hook is divided into distinct functional segments: a body portion with a hook opening, a gate that can pivot between open and closed positions, and a locking mechanism with a locking member and capture area. This segmentation allows each component to perform its specific function while maintaining overall connection security.
Solution Approach 2:
The locking mechanism is designed to automatically engage when the gate closes, with the locking member being received in the capture area to prevent gate movement. This preliminary locking action ensures the connection is secured before any load is applied, preventing disengagement under horizontal forces.
2Reliability
If a gated hook is used to prevent disengagement, then the reliability improves, but the ease of operation deteriorates due to the additional locking mechanism
Solution Approach 1:
The gate is designed to pivot dynamically between open and closed positions, allowing rapid connection and disconnection. The spring mechanism provides automatic resetting, enabling the gate to return to the closed position after opening, which maintains readiness for quick re-engagement without manual intervention.
Solution Approach 2:
The spring mechanism automatically biases the gate to the closed position and the locking member to engage with the capture area. This self-service feature eliminates the need for manual locking operations, allowing workers to simply open the gate for connection and the system automatically secures itself, maintaining both reliability and ease of operation.
3Reliability
If the hook is designed to resist horizontal forces, then the reliability under lateral loads improves, but the device complexity increases due to reinforcement structures
Solution Approach 1:
The hook opening is designed with an asymmetric geometry where the curved surface provides natural resistance to horizontal forces. The gate and locking mechanism are positioned to utilize the structural strength of the hook body, with the locking arm extending into the capture area to prevent lateral movement without requiring additional reinforcement elements.
Solution Approach 2:
The locking mechanism is integrated directly into the hook body structure, with the locking arm formed as part of the hook portion and the capture area defined by the body geometry. This merging of the locking function into the existing structural elements provides horizontal force resistance without adding separate reinforcement components.
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 gated snap hook assembly effectively prevents disengagement by maintaining a secure connection to anchor points, even under horizontal forces, enhancing worker safety in construction environments.
Implementation Method 1
A gated snap hook assembly with a complex torsion spring mechanism that biases the gate and trigger to closed positions
Implementation Method 2
using a dual-purpose spring to lock the gate and trigger, preventing pivotal motion
Data Source
AI summary
A snap hook assembly includes a hook body defining a neck portion and a hook portion which form a capture area. A gate and a trigger are both pivotally mounted to the hook body. The gate is moveable between a closed position and an open position and is biased to the closed position. The snap hook is configured such that, when the gate is in the closed position, it cannot be moved to the opened position. The trigger is operable to release the gate, so that the gate can be moved from the closed position to the opened position.