Quick Release Lockpin Mechanism for Load-Bearing Tethers
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Solution Overview
Problem
Existing quick disconnect systems for tethers or straps, such as those used in parachutes, are difficult to release under heavy load and may lead to inadvertent disconnection, especially in inclement conditions or emergencies.
Innovation Solution
A quick release restraint system featuring a restraint body with a lockpin and return member, where a sleeve and ripcord can displace the lockpin from a fully closed to fully open position, allowing easy release under load, with a design that prevents inadvertent disconnection and accommodates operation with heavy gloves or in wet conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snap hook is used to attach a tether to an anchor line, then the connection is secure for normal use, but it becomes extremely difficult to release when under load
Solution Approach 1:
The disconnect device is divided into separate functional components: a restraint body, a lockpin, a return member, and a release mechanism. This segmentation allows the locking function and releasing function to be independently optimized, enabling secure attachment during normal use while allowing easy release when needed.
Solution Approach 2:
The lockpin acts as an intermediary element between the restraint body and the tether. It provides the actual mechanical connection and can be independently actuated by the release mechanism, allowing the user to disconnect the tether without directly manipulating the main restraint body under load.
2Device complexity
If a traditional disconnect device is used, then it provides basic connection functionality, but it lacks remote release capability for emergencies
Solution Approach 1:
The restraint body is designed to accommodate multiple release methods: direct manual operation of the lockpin, operation via the return member, and remote release through the integrated ripcord mechanism. This multi-functionality allows the same device to serve both routine disconnect operations and emergency release scenarios.
Solution Approach 2:
The ripcord mechanism provides a remote release capability that substitutes for direct mechanical manipulation of the lockpin. By pulling the ripcord, the force is transmitted through the restraint body to actuate the lockpin release, allowing emergency disconnect without requiring the user to reach and manually operate the disconnect device.
3Ease of operation
If a disconnect mechanism is made more sensitive for easier release, then it becomes easier to operate, but it increases the risk of inadvertent disconnection
Solution Approach 1:
The lockpin is designed with dynamic characteristics that allow it to remain firmly locked under normal conditions but become mobile when a specific release force is applied. The return member provides a biasing force that maintains the locked state, while the release mechanism can overcome this bias to enable controlled release, preventing inadvertent disconnection while allowing intentional release.
Solution Approach 2:
The return member exerts a continuous biasing force on the lockpin to maintain the locked position and prevent inadvertent release. This preliminary counter-action must be overcome by a deliberate release action, ensuring that disconnection only occurs when intentionally triggered by the user through the designated release mechanism.
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
Enables quick and reliable disconnection of tethers from attachment points under heavy loads, with a remote release option for emergencies, while minimizing the risk of inadvertent release and reducing snagging or entanglement.
Implementation Method 1
A return member is retained between the harness fitting and a first end of the lockpin body. The return member exerts a biasing force on the lockpin body towards the closed end.
Implementation Method 2
The sleeve pin exerts a pulling force on the lockpin body. The sleeve and lockpin body move away from the closed end from a fully closed position to a fully open position when the pulling force exceeds the biasing force.
Implementation Method 3
The ripcord terminal also exerts a pulling force on the lockpin body when the ripcord moves away from the closed end.
Data Source
AI summary
A quick release restraint system comprising a restraint body that mates a harness fitting with a moveable lockpin. The lockpin is held in a closed position by a return member and can be moved to an open position when a sleeve and/or a ripcord is moved away from the lockpin. The sleeve surrounds the restraint body and mates with an internal lockpin body that may also be attached to the ripcord. The ripcord and/or sleeve engage the lockpin body in a single direction to generate a pulling force that counteracts a biasing force of the return member.