Chain Saw Filing Fixture with Cam Guide
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Solution Overview
Problem
Chain saw cutting links dull unpredictably, leading to reduced cutting efficiency and safety hazards, with existing manual filing methods being unsafe and automatic filing machines being expensive and impractical for field use.
Innovation Solution
A filing fixture with flanges, counter holds, and a cam portion that securely attaches to the chain saw guide bar, providing a stable platform for manual filing with rotatable rollers to support the file, ensuring safe and reliable sharpening of cutting links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual filing is performed by loosely holding the file with hand, then the operator can carry simple tools, but safety hazards increase due to potential accidents
Solution Approach 1:
The patent introduces a filing fixture as an intermediary device between the operator and the chain. The fixture includes a guide bar holder, file guide, and clamping mechanism that securely positions the file during sharpening operations. This intermediary system eliminates the need for the operator to manually hold the file, thereby ensuring safety while maintaining ease of operation through simple attachment and adjustment mechanisms.
2Reliability
If automatic filing machines are used, then filing precision and safety are improved, but device cost and complexity increase significantly
Solution Approach 1:
The filing fixture is designed to be a simple, self-contained device that the operator can set up and use independently without complex automation. The fixture includes adjustable components that allow the operator to manually position the file and guide bar, then secure them using simple clamps and guides. This self-service approach provides reliable and safe filing operations while avoiding the high cost and complexity of automatic filing machines.
3Strength
If the fixture uses multiple securing points (counter holds and cam portion), then the grip strength on guide bar improves, but the device complexity increases
Solution Approach 1:
The fixture is segmented into distinct functional components: the guide bar holder with counter holds for initial positioning, the cam portion for additional securing, and the file guide mechanism. Each segment performs a specific function, and together they provide strong grip strength. The segmentation allows for modular assembly and adjustment, managing device complexity while achieving the desired securing strength through distributed contact points.
Data Source
AI summary
A fixture configured to file a chain of a chain saw. The fixture includes at least one pair of flanges, wherein each of the flanges has a first end and a second end. Further, a first connecting portion connects the flanges at their first ends, and a second connecting portion connects the flanges at their second ends. Further, the first connecting portion includes a pair of counter holds configured to provide area contact with a guide bar of the chain saw. The fixture also includes a cam portion pivotally coupled to the second connecting portion, wherein the cam portion and at least one of the counter holds simultaneously secure the fixture to the guide bar.