Folding Tool Blade Ramp Design for Detent Wear Reduction
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Solution Overview
Problem
Painters and drywallers face inefficiencies due to the need to switch between multiple tools for various tasks, leading to wasted time and space requirements for storage.
Innovation Solution
A multi-purpose folding tool with a handle assembly, lock plate, deflectable arm, and rotatable blade that can be easily switched between open and closed positions, allowing for tasks such as scraping paint, cleaning cracks, spreading compound, and opening paint cans, all while reducing wear and increasing tool life through a ramp design that minimizes contact between the blade and detent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single multi-purpose tool is provided to perform various tasks (cleaning paint rollers, scraping paint, cleaning cracks, working putty, opening paint cans), then productivity is improved and storage space is reduced, but the device complexity increases due to the need for multiple functional components in one tool
Solution Approach 1:
The tool integrates multiple functions into a single device: the blade can be positioned in different orientations to perform scraping, cutting, and spreading tasks; the handle assembly includes a bottle opener and paint can opener. This allows one tool to replace multiple separate tools, improving productivity and reducing storage space requirements.
Solution Approach 2:
The blade is designed to be rotatable and repositionable relative to the handle assembly, allowing dynamic adjustment of the blade orientation and position. The deflectable arm with detent mechanism enables the blade to be locked in different positions (open and closed), providing adaptability for various task requirements while maintaining a compact form when not in use.
2Volume of moving object
If the blade is held in closed position by the deflectable arm and detent mechanism, then storage space is reduced and portability is improved, but wear between the detent and blade increases during rotation
Solution Approach 1:
The detent is extracted from direct contact with the blade surface and positioned to engage with the indent on the blade's trailing edge. This separation removes the wear-prone sliding contact between the detent and the main blade surface, isolating the wear to a minimal point contact at the indent location, thereby extending tool life while maintaining the compact closed position for storage.
3Reliability
If the blade is designed with a ramp to reduce contact between detent and blade, then tool life is extended, but manufacturing precision requirements increase due to the need for accurate ramp geometry
Solution Approach 1:
The ramp is provided only on one side of the blade (the side that contacts the detent during rotation), rather than requiring precision throughout the entire blade. This localized precision requirement is much more manageable in manufacturing, as only a small portion of the blade surface needs the accurate ramp geometry to guide the detent, while the rest of the blade can be manufactured with standard tolerances.
Data Source
AI summary
Provided is a tool that includes a handle assembly including a top portion and a bottom portion. The tool also includes a lock plate disposed between the top and bottom portions and having a deflectable arm having a free end biased towards the top portion, a fixed end opposite the free end, an inner edge, an outer edge, and a detent near the free end and the inner edge. The tool additionally includes a blade having first and second ends, an indent in a bottom surface of the blade near the first end for engaging the detent in a closed position, and a ramp on the bottom surface near the indent defining a reduced thickness portion of the blade that reduces in thickness from the indent towards an edge of the blade to reduce contact between the detent and the blade during rotation of the blade.