Folding Knife Lever Locking Mechanism One-Handed Operation
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Solution Overview
Problem
Folding knives with liner lock type locking mechanisms often have safety mechanisms that are awkward to operate with one hand, posing a challenge for easy and secure blade deployment and retraction.
Innovation Solution
A folding knife design featuring a lever member pivotally mounted to a locking member that blocks the locking member from moving from the locked to unlocked position when the blade is open, allowing for one-handed operation by pivoting the lever to release the blade for folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety mechanism is added to prevent inadvertent disengagement of the locking member, then the reliability of the locking mechanism is improved, but the ease of operation deteriorates because the safety mechanism is awkward to operate with one hand
Solution Approach 1:
The safety mechanism is merged with the liner lock mechanism by integrating the lever member directly onto the locking member. The lever member is pivotally mounted to the locking member, combining the safety function with the locking structure itself, allowing both functions to be operated through a single integrated component rather than separate mechanisms
Solution Approach 2:
The lever member is designed to be operable by the thumb of the same hand that grips the handle, making the safety mechanism self-serviceable during normal gripping. The lever extends into the user's grasp area and can be actuated without requiring the other hand or complex movements, allowing the user to release the lock while maintaining their grip position
2Strength
If the locking member is made rigid to securely engage the blade, then the strength of the locking mechanism is improved, but the ease of operation deteriorates because it becomes difficult to release
Solution Approach 1:
The locking mechanism is segmented into two functional parts: the locking member itself which provides the rigid locking engagement with the blade tang, and the separately mounted lever member which provides the release function. This segmentation allows the locking member to be strong and rigid while the lever provides a mechanical advantage for easy release
Solution Approach 2:
The lever member acts as an intermediary between the user's thumb and the locking member. Instead of directly manipulating the rigid locking member, the user pivots the lever member which in turn actuates the locking member to release from the blade tang, providing mechanical advantage and ease of operation
Data Source
AI summary
An exemplary folding knife has a handle including an inner liner portion and an outer panel. The inner liner portion includes a locking member that is operable to move between an unlocked position and a locked position. The folding knife includes a blade having a tang portion pivotally connected to the handle. The blade is operable to pivot relative to the handle about a pivot axis extending through the tang portion between a closed position and an open position. The tang portion engages the locking member when the blade is in the open position and the locking member is in the locked position. The folding knife also includes a lever member pivotally mounted to the locking member. The lever member is operable to block the locking member from moving from the locked position to the unlocked position when the blade is open.