Knife Safety Lock Assembly for Inadvertent Opening Prevention
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Solution Overview
Problem
Existing locking mechanisms for assisted opening knives do not adequately prevent inadvertent opening, posing a safety risk.
Innovation Solution
A knife with a locking assembly featuring a lock button that translates between locked and unlocked positions, biased by a spring arm, and a blade slot that prevents rotation when locked, ensuring secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to prevent inadvertent opening, then safety is improved, but device complexity increases
Solution Approach 1:
The lock button assembly is nested within the handle structure, with the spindle fitting into a recess in the blade tang. The spring arm is integrated into the handle liner, creating a compact nested arrangement that minimizes additional complexity while providing effective locking functionality.
Solution Approach 2:
The spring arm automatically biases the lock button to engage with the spindle when the blade is in the closed position, without requiring manual intervention. The mechanism self-regulates the locking state based on the blade position, reducing the need for additional control components.
2Reliability
If a spring arm biasing mechanism is added, then locking reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The spring arm is integrally formed with the handle liner as a single piece, combining the biasing function with the handle structure. This merging eliminates the need for separate spring components and assembly steps, simplifying manufacturing while maintaining reliable locking functionality.
Solution Approach 2:
The spring arm provides automatic biasing force that engages the lock button with the spindle based on the blade's position. This self-actuating mechanism eliminates the need for external actuation systems or complex control mechanisms, reducing manufacturing complexity.
3Reliability
If the lock button is biased towards locked position, then safety is improved, but ease of operation deteriorates
Solution Approach 1:
The lock button's position is dynamically adjusted by the spring arm based on the blade's state. When the blade is closed, the spring biases the lock button to engage the spindle. When the blade opens, the mechanical interaction pushes the lock button away, automatically disengaging the lock. This dynamic behavior maintains safety while requiring minimal user input.
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
The mechanism effectively secures the blade in the closed position, reducing the risk of accidental opening and enhancing user safety.
Implementation Method 1
a spring arm configured to bias the lock button, wherein the spring arm biases the lock button towards the locked position while the spindle is within the first portion of the slot
Implementation Method 2
biases the lock button towards the unlocked position while the spindle is within the second portion of the slot
Data Source
AI summary
A knife includes a handle defining a slot having a first portion and a second portion, a blade coupled to the handle, and a locking assembly configured to secure the blade within the handle. The locking assembly includes a lock button configured to translate between a first position proximate the first portion of the slot and a second position proximate the second portion of the slot, wherein a spindle is configured to translate within the slot, and a spring arm configured to bias the lock button, wherein the spring arm biases the lock button towards the first position while the spindle is within the first portion of the slot and biases the lock button towards the second position while the spindle is within the second portion of the slot.