Disposable Utility Knife Blade Shuttle and Flip Lock Mechanism
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Solution Overview
Problem
Conventional disposable utility knives are expensive and have a short cutting edge, which dulls quickly when used for cutting thick materials like corrugated boxes, and they do not provide extended use or easy access to both sides of the blade without opening the handle.
Innovation Solution
A low-cost disposable utility knife design featuring a hollow handle with a blade shuttle and U-shaped flip lock, allowing the blade to be slid between ends for extended use of both cutting edges, with a spring-biased locking mechanism for safety and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a conventional disposable utility knife uses a short cutting edge (1/4" to 3/8"), then the knife can be manufactured at low cost and provides basic safety coverage, but the cutting edge dulls quickly when used for thick materials and does not provide sufficient cutting life
Solution Approach 1:
The blade is segmented into two distinct cutting edges (first cutting edge section and second cutting edge section) that can be independently accessed. By sliding the blade assembly to one end or the other, the user can utilize one cutting edge after the other, effectively doubling the cutting life without increasing the overall blade length or complexity
Solution Approach 2:
The blade assembly is made dynamically movable within the handle through a sliding mechanism. The blade can be selectively positioned at either end of the handle, allowing dynamic switching between two cutting edges. This dynamic repositioning enables extended use without requiring a longer fixed blade
2Reliability
If a conventional disposable utility knife provides automatic safety cover activation, then safety is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The safety cover is pre-positioned to automatically engage when the blade is retracted into the handle. The mechanical design ensures that upon blade retraction, the safety cover is already in place to prevent accidental contact, eliminating the need for complex automatic sensing or actuation mechanisms
Solution Approach 2:
The safety mechanism is self-activating through the blade's own movement. When the user slides the blade into the handle for storage, the blade's retraction motion itself triggers the safety cover to engage, requiring no additional power source, sensors, or complex control systems
3Duration of action of moving object
If a conventional disposable utility knife allows blade replacement by opening the handle, then blade longevity can be extended, but the ease of operation is reduced and the disposable nature is compromised
Solution Approach 1:
Instead of accessing the blade by opening the handle (one-dimensional access), the invention provides access to two cutting edges by sliding the blade assembly along the length of the handle (linear dimensional change). This allows the user to flip the blade orientation and use the opposite cutting edge without disassembling the handle
4Productivity
If a conventional disposable utility knife uses a simple single-cutting-edge design, then the manufacturing cost is low, but the productivity is reduced when cutting thick materials like corrugated boxes
Solution Approach 1:
The single blade is segmented into two functional cutting edges, effectively creating two cutting tools in one. This segmentation allows the blade to perform cutting tasks on both sides, doubling the productivity for thick material cutting without requiring two separate blades or complex multi-blade mechanisms
Solution Approach 2:
The blade assembly is designed to perform multiple functions: it can cut in one direction using the first cutting edge, then be flipped to cut in the opposite direction using the second cutting edge. This multi-functionality increases productivity without adding significant manufacturing complexity
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 design provides twice the cutting life of conventional knives, is easy to manufacture and use, and ensures safe handling by preventing accidental blade retraction, while being cost-effective and intuitive to operate.
Implementation Method 1
a spring-biased locking mechanism for safety and ease of use
Data Source
AI summary
A utility knife includes a hollow handle having a slot and an opening at each end. A razor is slidable between each end of the handle and may protrude at each opposing end for cutting use. The razor is mounted to a shuttle which includes a tab that is positioned within the slot. The user may use the tab to slide the shuttle and the blade within the handle between the two ends, as desired. A U-shaped blocking component is pivotally attached to the handle and is used to block sliding movement of the tab beyond a midpoint of the handle to prevent the razor protruding into the user's hand. The user must unlock the blocking element to safely allow the shuttle to be slid past.