Swivel Carabiner Locking Collar With Offset Openings
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Solution Overview
Problem
Existing carabiners with automatic twist/push-locking mechanisms are prone to unintentional unlocking due to motion-induced rotation or pulling of the security sleeve, leading to wear and reduced functionality over time, especially in high-cycle applications like auto-belay devices in climbing.
Innovation Solution
A triple-locking swivel carabiner design featuring a locking collar with offset openings and a pin within a 3D milled raceway, requiring distinct rotational and translational motions to unlock, and a captive eye for secondary attachments, which reduces wear and prevents unintentional unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a security sleeve is used to lock the gate, then the carabiner provides automatic locking functionality, but the security sleeve may be unintentionally defeated by motion-induced rotation or pulling
Solution Approach 1:
The locking mechanism is divided into two independent stages: gate closing (first lock configuration) and security sleeve rotation (second lock configuration). This segmentation ensures that the security sleeve cannot be unintentionally rotated to unlock the gate, as the offset openings create a binding condition that prevents partial rotation. The gate can close automatically, but full unlocking requires intentional rotation of the security sleeve.
Solution Approach 2:
The first and second openings in the security sleeve are positioned at different angular locations (offset by a predetermined angle), creating an asymmetric configuration. This asymmetry means that when the gate is closed, the security sleeve cannot rotate freely in either direction without creating binding contact with the carabiner body, thereby preventing unintentional unlocking while allowing intentional unlocking when the user applies sufficient torque.
2Ease of operation
If the security sleeve is manually rotated to unlock, then the locking mechanism can be opened, but repetitive cycling induces wear on the security sleeve
Solution Approach 1:
The locking mechanism separates gate operation from security sleeve operation. The gate can open and close without requiring security sleeve rotation, which reduces the number of times the security sleeve must be manipulated. Only when intentional unlocking is needed does the user rotate the security sleeve, significantly reducing wear from repetitive cycling compared to designs where every gate operation requires sleeve manipulation.
3Reliability
If the first opening clears the body before the second opening, then unintentional unlocking is prevented, but the locking mechanism requires more complex motion to unlock
Solution Approach 1:
The unlocking process is segmented into two distinct phases: first rotating the security sleeve to clear the first opening, then continuing rotation to clear the second opening. This segmented approach, while requiring two clearing events, provides a clear mechanical sequence that is intuitive for users and reliably prevents unintentional unlocking, as partial rotation (clearing only the first opening) does not unlock the gate.
Data Source
AI summary
A carabiner includes a swivel loop and a body rotatably coupled to the swivel loop about a rotational axis. The body includes a spine having a spine axis that intersects the rotational axis at an intersection point disposed within the connection between the swivel loop and the body. The carabiner also includes a captive eye formed completely within the spine. The body and the captive eye being both rotatable relative to swivel loop.