Folding Utility Knife Blade Holder Pivot Mechanism
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Solution Overview
Problem
Folding utility knives often have blades that can be accidentally dislodged during use and require tools for blade release, making them inconvenient to operate.
Innovation Solution
A folding utility knife design with a blade holder that pivots between closed, cutting, and release positions, featuring a blade release actuator and locking mechanism that allows for tool-free blade release via a button-activated mechanism, and includes a magnetic or frictional release prevention device to secure the blade in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blade is allowed to be removed from the blade holder when in the operational position, then the blade can be easily replaced or flipped to expose a fresh cutting edge, but the blade can become accidentally removed or dislodged during use
Solution Approach 1:
The blade holder is designed with a pivotable mechanism that allows it to move between a closed position (blade retained), cutting position (blade accessible), and blade release position (blade removable). This dynamic positioning system enables the blade to be securely held during operation while allowing easy removal when needed, resolving the contradiction between blade retention reliability and ease of replacement.
Solution Approach 2:
A blade release actuator serves as an intermediary mechanism between the user's manual input and the blade retention system. When activated, this actuator triggers the blade holder to pivot to the blade release position, mediating the transition from a secure retained state to a removable state. This intermediary mechanism ensures controlled blade release while maintaining secure retention during normal use.
2Reliability
If a blade securing and releasing mechanism is included in the blade holder, then the blade can be securely retained, but the release mechanisms require tools or are not convenient to use
Solution Approach 1:
The blade release system is designed as a self-service mechanism where the blade holder itself provides the release function through its pivotable design. When the blade holder pivots to the blade release position, the blade automatically becomes disengaged from retention features, eliminating the need for separate tools or complex release mechanisms. The system serves itself by using the positional change of the blade holder to both secure and release the blade.
Solution Approach 2:
The release function is extracted from the blade holder body and implemented through the pivotal movement mechanism. By separating the retention function (when closed) from the release function (when pivoted to release position), the design eliminates the need for additional tool-based mechanisms while maintaining secure blade retention during operation.
Data Source
AI summary
A folding utility knife has a handle and a blade holder pivotally mounted on he handle. The blade holder is movable between (i) a closed position with the blade holder pivoted inwardly toward the handle, (ii) a cutting position with the blade holder pivoted outwardly relative to the handle, and (iii) a blade release position located between the closed position and the cutting position. A blade release actuator is located on the blade holder and is movable between (i) a first position preventing release of a utility knife blade located on the blade holder, and (ii) a second position permitting release of a utility knife blade located on the blade holder. A locking member is movable between (i) a blade locking position with the blade holder located in the cutting position that prevents movement of the blade release actuator from the first position to the second position, and (ii) a blade release position with the blade holder located in the blade release position that permits movement of the blade release actuator from the first position to the second position to, in turn, release a utility knife blade from the blade holder.