Snap Hook Gate Locking Mechanism
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Solution Overview
Problem
Current snap hooks used for connecting safety lines to loads or persons lack an effective gate locking mechanism, risking unintentional gate opening and potential injury or death due to lack of secure locking.
Innovation Solution
A snap hook design incorporating a body, gate, locking member, and trigger, where the gate is pivotally coupled and can be selectively locked within a slot in the nose portion of the body, utilizing a locking member and trigger to ensure the gate remains closed and prevents unintentional opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple gate design is used, then the device complexity is reduced, but the reliability of preventing unintentional gate opening deteriorates
Solution Approach 1:
The gate mechanism is divided into separate functional components: the gate itself, the locking member with slot, and the trigger. This segmentation allows each component to perform its specific function reliably while keeping the overall design manageable. The locking member engages with the slot to secure the gate, and the trigger provides a dedicated unlocking function.
Solution Approach 2:
The locking member acts as an intermediary between the gate and the trigger. It provides a mechanical interface where the trigger can disengage the gate from the locked position by moving the locking member out of the slot, enabling controlled gate opening while maintaining secure locking when engaged.
2Reliability
If a locking mechanism is added to prevent unintentional gate opening, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The locking member is designed to automatically engage with the slot when the gate is closed, providing self-locking functionality. This eliminates the need for additional actuators or complex control systems, as the mechanical design itself ensures the gate remains secured without requiring active maintenance or complex operation.
Solution Approach 2:
The locking feature is localized to specific areas: the slot is formed only in the nose portion of the body, and the locking member has a specific engagement geometry. This localized approach concentrates the locking function where it is most needed (at the gate closure point) rather than distributing complexity throughout the entire mechanism.
3Reliability
If the gate is designed to be securely locked, then the safety is improved, but the ease of operation for intentional opening may deteriorate
Solution Approach 1:
The trigger provides dynamic control over the locking state. By applying force to the trigger, the user can easily disengage the locking member from the slot and open the gate when needed. The mechanism transitions between locked and unlocked states based on the trigger position, making intentional opening simple while maintaining secure locking during normal use.
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3D
AI summary
A snap hook is provided. A body (1902) of the snap hook includes a generally hooked shaped mid portion positioned between a nose portion (1902a) and a connection portion. The body further has an opening to an inner edge that is positioned between the nose end and the connection portion. A gate (1940) has a first end pivotally coupled proximate the connection portion of the body and a second end configured and arranged to engage the nose portion of the body to selectively close an opening in the body. A locking member (1920) has a first end that is selectively received in a slot in the nose portion of the body. A trigger (1930) has an end that engages a second end of the locking member to disengage the first end of the locking member from the slot of the nose portion of the body.