One-Handed Snap-Hook Lever Angled Slot Release
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Solution Overview
Problem
Conventional snap-hooks require two-handed operation, making it difficult for users in the equestrian industry to attach or detach them from horse halters without losing control of the horse.
Innovation Solution
A snap-hook design featuring a pivotally movable lever with an angled slot and thumb tab, allowing for one-handed operation by sliding the thumb tab in the angled slot to open the eye loop, eliminating the need for two hands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional snap-hook with swivel tab is used, then the snap-hook can be opened, but two hands are required for operation
Solution Approach 1:
The patent repositions the thumb tab from a rearward location to a forward location on the lever, changing the spatial dimension of operation. This allows the thumb tab to be accessible from the front of the snap-hook, enabling one-handed operation while maintaining the same basic lever mechanism. The thumb tab is positioned to engage the palm of the hand when the snap-hook is held in the palm, creating a new operational geometry that resolves the two-handed requirement.
2Ease of operation
If the thumb tab is positioned for one-handed operation, then control is maintained, but the release mechanism must be redesigned
Solution Approach 1:
The patent designs the release mechanism so that the thumb tab directly actuates the lever through its natural pivoting motion. When the thumb tab is pressed forward, it moves the lever from the closed to the open position through the pivot point. The mechanism uses the user's thumb pressure directly to overcome the biasing force, eliminating the need for additional linkages or complex release mechanisms. The biasing means automatically returns the lever to the closed position when released, making the system self-regulating.
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 secure one-handed operation of the snap-hook, maintaining control of the horse during attachment or detachment, reducing the risk of losing control.
Implementation Method 1
A biasing means is positioned between the hook section and the lever for biasing the lever against pivoting relative to the hook section
Data Source
AI summary
A hook forms a portion of an eye loop. A lever is pivotally movable relative to the hook. The lever forming a remaining portion of the eye loop. A thumb tab engages the lever and is positioned in an angled slot defined in a guide plate. The thumb tab is slidable in the angled slot, forming a release mechanism, such that the sliding movement of the thumb tab in the angled slot urges the lever to pivot relative to the hook to open said eye loop. The lever further includes an opening for receiving a protruding portion of the thumb tab, such that the lever can rotate to open the eye loop, essentially without sliding the thumb tab down in the slot of the hook.