Folding Knife Thumb Release Mechanism
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Solution Overview
Problem
Existing folding knives require two hands to unlock and lock the blade, which can be inconvenient for one-handed operation.
Innovation Solution
A folding knife design featuring a thumb release mechanism that includes a push button or thumb disc to pivotally retain the knife blade, allowing it to be unlocked and locked with one hand, with optional spring-assisted or automatic opening embodiments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional locking mechanism is used, then the blade can be securely locked in open and closed positions, but two hands are required to operate it
Solution Approach 1:
The locking mechanism is divided into separate functional components: a lock pin for securing the blade, a liner lock for maintaining open position, and a push button for actuation. This segmentation allows each component to perform its specific function independently, enabling one-handed operation while maintaining secure locking capability.
Solution Approach 2:
The push button serves as an intermediary element that translates a simple one-handed pressing motion into the complex sequence of actions required to unlock the blade. When pressed, it simultaneously moves the lock pin and releases the liner lock, mediating between the user's simple input and the multi-component locking system.
2Ease of operation
If a secure locking mechanism is implemented, then blade safety is improved, but the unlocking process becomes more difficult
Solution Approach 1:
The locking mechanism is designed to be self-actuating through the push button system. A single pressing action automatically coordinates the movement of the lock pin and liner lock release, eliminating the need for complex manual manipulation while maintaining reliable locking. The system serves itself by using one simple input to trigger the entire unlocking sequence.
3Speed
If spring assistance is added to assist blade opening, then opening speed is improved, but device complexity increases
Solution Approach 1:
Spring arms are positioned to counterbalance the weight and resistance of the blade during opening. The springs provide assisting force that offsets the blade's inertia and friction, enabling faster opening with minimal user effort. This counterbalancing approach adds mechanical assistance without requiring complex active control systems.
Data Source
AI summary
A folding knife with thumb release opening includes a knife blade, a first liner plate, a second liner plate, a first handle plate and a second handle plate. The knife blade includes a cutting edge and a point formed on a first end. A second end of the knife blade is pivotally retained by a first end of first and second liner plates. A push button is retained in the knife blade. A liner lock is formed in the second liner plate. A lock pin is pressed into an end of the liner lock and a lock hole is formed in the second end of the knife blade to receive the lock pin. The first and second handle plates cover the first and second liner plates. The push button may be replaced with a thumb disc. A second embodiment includes spring assisted opening and a third embodiment includes automatic opening.