Auto-Retracting Scraper Blade Stop for Consistent Extension Force
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Solution Overview
Problem
Existing manual scrapers with auto-retract functionality require non-constant, non-uniform force application to keep the blade extended, leading to user fatigue due to variable load on the operational digit.
Innovation Solution
An auto-retract scraper design incorporating a rotating hard stop and torsion spring mechanism that allows the blade to be automatically extended and retracted, utilizing a rotating hard stop to maintain blade extension without continuous manual force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a typical auto-retract configuration is used where force is applied against the edge of the blade, then the blade can be extended from the housing, but the operational digit must constantly apply variable force to the slider which quickly produces fatigue
Solution Approach 1:
The scraper blade automatically maintains its extended position through the cam mechanism that converts the initial pushing motion into sustained mechanical engagement. The cam's geometric profile ensures the blade remains extended without requiring continuous manual force, allowing the tool to serve itself during normal operation.
Solution Approach 2:
The cam mechanism transforms the static holding problem into a dynamic solution where the cam profile's varying radius creates automatic mechanical advantage throughout the blade's extended position. This dynamic geometric transformation maintains constant blade extension with minimal initial user input.
2Reliability
If manual locking features are used to hold the blade extended, then the blade can be securely positioned, but the blade must be manually retracted for storage which reduces convenience
Solution Approach 1:
The scraper implements periodic action through the cam mechanism that naturally cycles between extended and retracted positions. The cam's rotational or oscillating motion creates automatic periods of blade exposure and retraction, eliminating the need for separate manual locking and unlocking operations.
Solution Approach 2:
The cam mechanism serves as an intermediary between the user's initial pushing action and the blade's extended position. This intermediate mechanical element translates brief user input into sustained blade extension, and similarly mediates the retraction process by converting cam motion back into blade movement.
3Productivity
If the slider is constantly engaged to keep the blade extended, then scraping operation can continue, but the non-uniform force required produces fatigue to the finger or thumb
Solution Approach 1:
The cam mechanism enables the scraper to maintain continuous operational readiness without requiring sustained user effort. Once the blade is extended through the cam's geometric action, the mechanism self-maintains this position throughout the scraping task, allowing continuous productivity without user fatigue.
Solution Approach 2:
The dynamic cam profile creates varying mechanical advantage throughout the blade's travel, with the geometry automatically adjusting to maintain optimal force distribution. This dynamic adaptation eliminates the need for users to consciously adjust their applied force, preventing fatigue during extended use.
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 solution provides a robust and efficient auto-retract mechanism that reduces user fatigue by maintaining blade extension with a consistent force, enhancing safety and usability.
Implementation Method 1
a torsion spring
Data Source
AI summary
An auto-retract scraper is described herein. The auto-retract scrape comprises a housing, a slider, a blade, a rotating hard stop, and a torsion spring. The rotating hard stop is rotated clockwise forcing the blade forward and out of the housing when the slider is engaged.