Folding Tool Cover Locking Mechanism
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Solution Overview
Problem
Existing folding tools with extra long handles are cumbersome to use and expensive, as they require a costly locking mechanism to protect the cutting edge of the tool member in both open and closed positions.
Innovation Solution
A folding tool design featuring a normal length handle with a tool member cover that locks the tool member in an open position and protects the cutting edge in a closed position, utilizing a pivotally retained handle system with a tool member slot and cover pivot pin, allowing for axial extension and retraction of the tool member cover to secure the cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extra long handle is used to protect the cutting edge in a closed orientation, then the cutting edge is protected, but the tool becomes more difficult to use and occupies more storage space
Solution Approach 1:
The tool is divided into separate functional components: a normal-length handle for comfortable operation, a tool member with cutting edge, and a dedicated cover for protection. This segmentation allows each component to be optimized independently - the handle for usability and the cover for protection.
Solution Approach 2:
A cover is introduced as an intermediary component between the tool member and the user/environment. This cover serves dual functions: protecting the cutting edge when closed and locking the tool member in position when open, eliminating the need for an extra long handle.
2Reliability
If an extra long handle is used to protect the cutting edge, then the cutting edge is protected, but the storage space required increases
Solution Approach 1:
The tool member is nested within the cover when in closed position, with the cutting edge received within the cover's interior. This nesting arrangement allows the tool to be compact for storage while maintaining full functionality, eliminating the need for extended handle length.
3Reliability
If a costly locking mechanism is used to protect the cutting edge, then the cutting edge is protected, but the manufacturing cost increases
Solution Approach 1:
The cover is designed to perform multiple functions: protecting the cutting edge, locking the tool member in open position through engagement with the handle, and providing a structural framework. This multi-functionality eliminates the need for separate expensive locking mechanisms.
Solution Approach 2:
The cover's geometry itself provides the locking function through its engagement features with the handle, rather than requiring additional active locking components. The structural design of the cover and handle interface creates the locking effect passively.
Data Source
AI summary
A folding tool includes a handle, a tool member and a tool member cover. The handle includes a first handle half and a second handle half. One end of the tool member is pivotally retained by the handle. A cover pivot pin is retained in the other end of the first and second handle halves. The cover pivot pin is inserted through a longitudinal slot formed through one end of the tool member cover. A substantially D-shaped slot is formed in the other end of the first or second handle halves. A guide pin extends from the tool member cover. The guide pin is sized to slide freely in the substantially D-shaped slot. The tool member cover is pivoted against the tool member in an open position and pivoted away from the handle to protect the tool member in a closed position.