Utility Knife Guard with Detachable Strap for Depth Adjustment
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Solution Overview
Problem
Conventional utility knives lack rapid cutting depth adjustment and adequate user protection during oblique and perpendicular cutting modes, leading to increased risk of laceration and abrasion injuries, especially for roofers and other professionals.
Innovation Solution
The utility knife features a detachable guard with adjustable side members and a work-engaging member that allows for longitudinal and angular adjustments of the blade exposure, providing enhanced user protection and control by preventing hand slippage and allowing precise cutting depth settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the blade is made longer to improve cutting capability, then the cutting depth increases, but the risk of hand slippage and injury increases
Solution Approach 1:
A guard member is introduced as an intermediary component between the user's hand and the blade. The guard extends from the handle to cover portions of the blade, physically blocking the hand from contacting the sharp cutting edge while still allowing the blade to perform its cutting function. This mediator resolves the contradiction by enabling long blade exposure for deep cutting without directly exposing the user to injury risk.
2Adaptability or versatility
If the handle parts are separated to adjust cutting depth, then the cutting depth can be changed, but the time required for adjustment increases
Solution Approach 1:
The guard member is designed as a separate, detachable component from the handle, allowing independent adjustment of the guard's position relative to the blade. This segmentation enables the user to modify cutting depth by simply moving the guard along the blade without disassembling the entire handle, significantly reducing adjustment time while maintaining adaptability.
Solution Approach 2:
The guard member incorporates movable elements that allow dynamic adjustment of its position along the blade during operation. The guard can be shifted to different locations to expose different lengths of the blade, providing continuous or discrete depth adjustments without requiring handle disassembly, thus resolving the time-loss contradiction.
3Adaptability or versatility
If the guard is made detachable to improve adjustability, then the cutting depth can be modified, but the device complexity increases
Solution Approach 1:
The guard is divided into modular segments or sections that can be independently adjusted or detached. This segmentation allows for simple attachment and detachment mechanisms while providing multiple adjustment positions, achieving high adaptability without requiring complex integrated structures. The modular design keeps the overall device complexity manageable.
Data Source
AI summary
In a utility knife, having a handle, a blade, and a guard that prevents the user's fingers from being lacerated or abraded, a flexible strap with a stud that snap-fits into a socket in the guard is used to secure the guard to the handle. The stud fits into a recess in the handle to limit or prevent longitudinal movement of the guard relative to the knife handle.