Utility Knife Blade Dispenser and Wiper Mechanism
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Solution Overview
Problem
Existing utility knives lack an efficient mechanism for replacing blades and managing debris, leading to user inconvenience and potential jamming issues.
Innovation Solution
A utility knife design featuring a handle with a blade holder assembly, a spare blade carrier, a spare blade dispenser, and an actuator that allows for easy blade replacement and debris removal, utilizing a resilient blade wiper to clean the blade surfaces before retracting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a utility knife includes a blade holder assembly with a retractable blade, then the blade can be easily replaced and stored, but debris may enter the handle and cause jamming issues
Solution Approach 1:
The blade wiper is positioned to perform the cleaning action automatically as the blade retracts into the handle, before the blade is fully stored. This preliminary cleaning action prevents debris from entering the handle and causing jamming issues, while maintaining the ease of blade replacement operation.
Solution Approach 2:
The blade wiper acts as an intermediary component between the blade and the handle interior. It is constructed to contact the blade surface and remove debris, serving as a protective mediator that prevents direct contamination of the handle while allowing the blade to be easily replaced through the existing retractable mechanism.
2Productivity
If a utility knife includes a spare blade carrier and dispenser mechanism, then blade availability is improved, but the device complexity increases
Solution Approach 1:
The spare blade carrier and dispenser are merged into the existing handle structure, utilizing the same actuator mechanism that controls the main blade. The spare blades are carried within the handle body, and the dispenser function is integrated with the blade holder assembly, allowing easy blade replacement without adding separate complex mechanisms.
Solution Approach 2:
The actuator serves multiple functions: it controls the extension and retraction of the main blade, and it also operates the spare blade dispenser mechanism. This multi-functionality allows the spare blade carrier to be accessed and blades to be replaced using the same actuator, improving blade availability while minimizing the increase in device complexity.
3Ease of operation
If the blade is retracted into the handle, then the knife is compact and safe, but debris on the blade surface may cause jamming
Solution Approach 1:
The blade wiper is positioned to perform the cleaning action automatically as the blade retracts into the handle, before the blade is fully stored. This preliminary cleaning action prevents debris from entering the handle and causing jamming issues, while maintaining the ease of blade replacement operation.
Solution Approach 2:
The blade wiper is constructed to be automatically actuated during the blade retraction process, requiring no separate manual intervention. The existing actuator mechanism that retracts the blade also automatically engages the wiper to clean the blade surface, enabling the system to serve itself by preventing jamming during the normal retraction operation.
Data Source
AI summary
A utility knife includes a handle, a blade holder assembly, a spare blade carrier, a spare blade dispenser, and an actuator. The blade holder assembly is constructed and arranged to hold a blade at a position of use at one end of the handle. The spare blade carrier is disposed in the handle, and is configured to carry a plurality of spare blades. The spare blade dispenser is constructed to separate one of the spare blades from the plurality thereof and present the one separated blade to the user. The actuator is operatively associated with the blade dispenser, wherein movement of the actuator moves the blade dispenser to separate the one spare blade from the plurality to present the one separated blade to the user.