Safety Utility Knife Blade Carrier Hinged Link Mechanism
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Solution Overview
Problem
Utility knives, especially those with razor blades, often cause injuries due to inadvertent contact with cutting edges during blade removal, insertion, and handling, highlighting the need for designs that limit user exposure to these edges.
Innovation Solution
A safety utility knife design featuring a blade carrier pivotally connected to an actuator via a hinged link, allowing the blade carrier to pivot between safety, intermediate, and cutting orientations, with an actuator that can also pivot between actuating and non-actuating positions, ensuring the blade is automatically reoriented to a safe position when not in use or during handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the blade carrier is made movable between safety and cutting orientations, then user safety is improved by limiting exposure to cutting edges, but device complexity increases due to the hinged link mechanism
Solution Approach 1:
The blade carrier is designed to be dynamically repositionable between a safety orientation (where the cutting edge is protected) and a cutting orientation (where the cutting edge is exposed). This dynamic repositioning is achieved through the hinged link mechanism that allows the blade carrier to pivot relative to the actuator, enabling the blade to move between protected and functional positions as needed.
2Reliability
If automatic blade reorientation to safety position is implemented, then injury risk during handling is reduced, but the mechanism complexity increases
Solution Approach 1:
The blade carrier is automatically reoriented to the safety orientation whenever the utility knife is not actively being used for cutting. This preliminary action of returning to safety position occurs automatically through the hinged link mechanism's design, which causes the blade carrier to pivot to the protected position when the actuator is not engaged, thereby preventing inadvertent contact with the cutting edge during blade removal, insertion, or storage.
3Ease of operation
If the hinged link allows blade carrier pivoting, then safety orientation is achieved, but the linkage complexity increases
Solution Approach 1:
The hinged link serves as an intermediary mechanical element that connects the actuator to the blade carrier, enabling the blade carrier to pivot between safety and cutting orientations. This intermediate component translates the actuator's movements into the appropriate blade carrier repositioning, providing a mechanical mediation that achieves safe blade repositioning while maintaining operational simplicity.
Data Source
AI summary
The present disclosure relates to a safety utility knife including a blade carrier that is repositionable between a safety orientation, an intermediate orientation and a cutting orientation via an actuator that is interconnected with the blade carrier via a hingable link. Once the blade carrier is repositioned to the cutting orientation, the blade carrier is automatically returned to the safety orientation anytime a cutting action is discontinued.