Scraper With Sliding Safety Guard And Ergonomic Handle
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Solution Overview
Problem
Conventional scraper tools lack effective safety measures to prevent injuries from sharp blades, are cumbersome to use, and often lead to user fatigue due to suboptimal handle design and blade exposure issues, especially in wet or cold conditions.
Innovation Solution
A handheld scraper with a retractable safety guard that covers both sides of the blade, a secure housing mechanism, and a design allowing for a reduced angle of attack to reduce fatigue, featuring a flexible guard member that slides to protect the blade when not in use and can be easily retracted for scraping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a removable guard cover is provided to sheath the blade entirely, then user safety is improved, but device complexity and ease of operation deteriorate due to repeated removal and reattachment requirements
Solution Approach 1:
The guard member is designed to automatically cover the blade when not in use without requiring user intervention to attach or remove a separate cover. The guard's flexible nature and integration with the handle allow it to passively protect the blade, eliminating the need for repeated manual operations.
Solution Approach 2:
The guard member transitions between covering and exposed positions dynamically during use. It can be easily moved to expose the blade when needed and automatically returns to or remains in the covering position when not in use, providing adaptive safety rather than static protection.
2Productivity
If the blade is fully exposed for scraping operations, then productivity is improved, but user safety deteriorates due to risk of accidental injuries
Solution Approach 1:
The blade exposure state is dynamically controlled through the guard member's position. During active scraping, the guard is moved to expose the blade for full productivity. When the scraping operation ceases, the guard automatically or easily returns to cover the blade, maintaining safety without requiring separate safety actions.
3Adaptability or versatility
If an elongated handle is used for scraping operations, then versatility is improved, but ease of operation deteriorates due to excessive hand and wrist fatigue
Solution Approach 1:
The handle's grip portion is specifically designed with localized ergonomic features including a contoured shape and textured surface in the user's hand contact area. This localized optimization provides comfort and control without requiring the entire handle to be redesigned, maintaining versatility while reducing fatigue.
4Object-affected harmful factors
If a retractable blade carrier is used to retract the blade for storage, then user safety is improved, but reliability deteriorates due to wobbly and loosely secured blade
Solution Approach 1:
The safety function is segmented from the blade retention function. The guard member provides safety coverage independently of the blade's mechanical retention in the carrier. This segmentation allows the blade to be securely held in the carrier for stability while the guard provides separate, reliable safety coverage, eliminating the trade-off between retraction safety and blade stability.
Data Source
AI summary
An improved scraping tool with a retractable safety guard, for removing debris and dirt from glass, tile and the like. The scraping tool comprises a housing formed of two separable housing portions and a guard member, and is adapted to securely retain a single- or double-edged blade between the housing portions. The separable housing portions are removably secured and held in sealed alignment by a plurality of securing elements, including a releasable housing lock mechanism. Within the housing, a scraping blade is held in a rigid, stationary position by a plurality of posts. A guard member, the ends of which form a pair of upper and lower blade shields, is positioned and secured in sliding engagement within the housing.