Quick-Start Chainsaw Crankshaft Extension for Drill Engagement
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Solution Overview
Problem
Small internal combustion engines, such as those in chainsaws, can be difficult to start when cold or if the spark plug is dirty, and some users lack the physical capability to pull the starter cord with sufficient force and speed.
Innovation Solution
A quick-start mechanism is introduced, where a crankshaft extension is designed to engage with a socket, allowing a portable drill to rotate the crankshaft, eliminating the need for a pullcord by providing a socket that fits within a hole in the chainsaw casing, enabling engine start through external rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual pullcord starter system is used, then the engine can be started without additional equipment, but users who lack physical capability cannot start the engine when it is cold or if the spark plug is dirty
Solution Approach 1:
The patent replaces the manual mechanical pullcord starting system with an electric drill-driven starting system. The electric drill provides the necessary rotational force to turn the crankshaft, eliminating the need for manual pulling and enabling reliable starting under cold or adverse conditions without requiring physical strength from the user.
Solution Approach 2:
The patent introduces an intermediary mechanism consisting of a drill adapter and drive shaft that connects the electric drill to the engine's crankshaft. This intermediary system transfers the rotational energy from the drill to the engine, enabling the drill to perform the starting function that would otherwise require direct manual effort.
2Ease of operation
If a quick-start extension is added to the crankshaft, then the engine can be started with a portable drill, but the device complexity increases
Solution Approach 1:
The patent segments the starting system into separate functional components: the existing pullcord starter remains intact, while a separate drill adapter assembly with drive shaft and engagement mechanism is added. This segmentation allows the new electric starting capability to be added without modifying or complicating the original mechanical starting system, maintaining simplicity of each individual component.
Solution Approach 2:
The drill adapter assembly is designed as a universal interface that can engage with the crankshaft and transfer rotational power. The adapter serves multiple functions: connecting the drill to the crankshaft, providing rotational motion, and enabling starting operation. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in overall device complexity.
Data Source
AI summary
Disclosed is a method, apparatus and kit for starting a quick-start chainsaw. The quick-start chainsaw comprises a chainsaw having a crankshaft extending along an axis between first and second ends and a quick-start extension extending along the axis from the second end adapted to engage with and be rotated by a socket. The quick-start chainsaw further comprises a casing with a hole therethrough aligned with the axis providing access to the quick-start extension therethrough. The method comprises securing the socket to a portable drill, locating the socket within the hole and connecting the socket with the quick-start extension. The method further comprises rotating the socket and the quick-start extension around the axis with the portable drill thereby rotating the crankshaft and starting a combustion engine. The kit comprises a quick-start chainsaw and a socket rotatable by a portable drill.