Folding Tool Lock With Spring-Biased Arcuate Engagement
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Solution Overview
Problem
Folding tools, such as pocketknives and multipurpose tools, often unintentionally fold during use, compromising safety and functionality.
Innovation Solution
A lock mechanism is integrated into the folding tool that secures the folding tool in an unfolded, deployed position using a locking element with a spring bias and a cam portion, engaging a locking surface to prevent unintended folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to prevent unintended folding, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is designed to automatically engage and disengage based on the tool's position. The spring-loaded locking element self-activates when the tool is in the deployed position and automatically locks without requiring manual intervention, while still providing reliable prevention of unintended folding.
Solution Approach 2:
The locking mechanism is divided into distinct functional components: a locking element with locking surface, a spring for biasing, and a button for manual actuation. This segmentation allows each component to perform its specific function efficiently while keeping the overall design relatively simple and maintainable.
2Reliability
If a spring-loaded locking element is used, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The locking element incorporates a curved or arcuate locking surface that engages with a corresponding cam surface. This curved geometry provides progressive engagement and allows for some tolerance in manufacturing, as the arcuate shape naturally guides alignment during operation rather than requiring precision machining of flat surfaces.
Solution Approach 2:
The spring provides a variable force that compensates for minor misalignments. The spring's elasticity allows the locking element to move within certain limits, absorbing manufacturing tolerances and ensuring reliable engagement without requiring extremely tight precision controls during manufacturing.
3Ease of operation
If the locking element is offset from the button axis, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The button and locking element are positioned in different spatial dimensions relative to each other. The button is offset from the locking element's axis of rotation, allowing the button to be actuated in one dimension while the locking element responds in another dimension. This creates a more ergonomic interface where the user's finger naturally presses the button at an optimal angle for easy operation.
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 lock mechanism effectively maintains the folding tool in a deployed position, enhancing safety and usability by preventing accidental folding and ensuring secure operation.
Implementation Method 1
the locking element is spring biased by a spring in a direction parallel to the folding tool axis
Implementation Method 2
the folding tool portion comprises a cam portion disposed about the folding tool axis, where the cam portion defines a locking surface
Data Source
AI summary
A lock is provided for a folding tool including a lock that engages a folding tool in an unfolded, deployed position to prevent unintended folding of the tool. By way of example a tool is provided including: a handle portion; a folding tool portion, where the folding tool portion is configured to be rotatable between a folded, stowed position at least partially within the handle portion, and a deployed position substantially outside of the handle portion; and a locking element, where the locking element is configured to engage a locking surface of the folding tool portion in response to the folding tool portion moving to the deployed position, where the locking element includes an arcuate surface for engaging the locking surface of the folding tool portion.