Folding Knife Liner Lock Safety Mechanism
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Solution Overview
Problem
Conventional folding knives with liner locks can inadvertently close due to pressure applied to the flexible locking element, leading to unintended blade movement.
Innovation Solution
A safety mechanism that is resiliently biased to a safety position, requiring sufficient pressure to overcome the biasing force and move to a release position, allowing controlled unlocking of the blade for closure, featuring a locking lever or slidable latch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liner lock is used to prevent blade closure, then the blade is secured in the open position, but the lock can be defeated inadvertently during use if sufficient pressure is applied to the flexible locking element
Solution Approach 1:
A safety mechanism is introduced as an intermediary component between the user's hand and the locking element. This safety mechanism blocks the path or prevents direct pressure transmission to the locking element, thereby preventing inadvertent closure while allowing intentional opening operations to proceed normally.
Solution Approach 2:
The safety mechanism is positioned to preemptively counteract any unintended pressure applied to the locking element. By being in place before inadvertent closure can occur, the safety mechanism applies a counteracting force or physical barrier that prevents the harmful effect from taking place.
2Reliability
If the safety mechanism is resiliently biased toward the safety position, then inadvertent movement of the locking element is prevented, but sufficient pressure must be applied to overcome the biasing force to release the lock
Solution Approach 1:
The biasing force parameter is optimized to provide sufficient resistance against inadvertent movement while remaining overcomeable by intentional user pressure. The spring constant or biasing mechanism parameters are adjusted to create an appropriate threshold that distinguishes between accidental and intentional actions.
Solution Approach 2:
The resilient biasing mechanism automatically returns the safety mechanism to the safety position after it has been displaced to the release position. This self-service feature eliminates the need for additional manual intervention to reset the safety mechanism, improving ease of operation after the locking function is fulfilled.
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
Prevents inadvertent closure of the blade by maintaining the locking element in a locked position until deliberate pressure is applied to transition to the release position, ensuring safe and controlled operation.
Implementation Method 1
A biasing mechanism, such as a spring, can be used to apply the required biasing force to the safety mechanism.
Implementation Method 2
The safety mechanism is resiliently biased toward the safety position and is retained in this position unless sufficient pressure is applied to the safety mechanism to overcome the biasing force.
Data Source
AI summary
A safety mechanism that protects against inadvertent closure of the blade of a folding knife. In one embodiment, the safety mechanism is implemented in a folding knife having a liner lock with a flexible, resilient locking element. The safety mechanism is movable between a safety position in which the safety mechanism interferes with movement of the flexible locking element to its unlocked position and a release position in which the locking element can be moved to its unlocked position for closing the blade. The safety mechanism is resiliently biased toward the safety position and is retained in this position unless sufficient pressure is applied to the safety mechanism to overcome the biasing force. A biasing mechanism, such as a spring, can be used to apply the required biasing force to the safety mechanism.