Integrated Fuel Shutoff Lever for Small Engines
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Solution Overview
Problem
Small internal combustion engines lack a simplified and integrated manual shutoff mechanism that effectively combines fuel control and electrical shutdown, leading to complexities in engine operation and safety.
Innovation Solution
A combination lever that integrates a manual fuel shutoff, fuel valve, and electrical shutoff switch, allowing users to manually control fuel flow to the carburetor and simultaneously disable the engine electrically, formed from a single construction using non-conductive materials like Nylon or resin, with a handle portion that rotates to control fuel flow and actuate the switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate manual shutoff and electrical shutoff mechanisms are used, then reliability of engine shutdown is improved, but device complexity increases
Solution Approach 1:
The patent combines separate manual shutoff and electrical shutoff mechanisms into a single integrated combination lever assembly. The lever simultaneously controls the fuel valve mechanically and actuates the electrical shutoff switch through integrated linkages, reducing the number of separate components while maintaining dual shutdown functions.
Solution Approach 2:
The combination lever serves multiple functions: it acts as both a manual fuel shutoff lever and an actuator for the electrical shutoff switch. This multi-functional design allows a single component to perform what previously required separate mechanisms, simplifying the overall control system.
2Ease of operation
If integration of fuel valve and electrical shutoff switch is implemented, then ease of operation is improved, but manufacturing complexity increases
Solution Approach 1:
The combination lever assembly is divided into distinct functional segments: the lever body, fuel valve control mechanism, electrical shutoff switch actuation mechanism, and mounting components. This segmentation allows each segment to be manufactured and tested separately before final assembly, reducing overall manufacturing complexity despite the integrated design.
3Volume of moving object
If compact integrated design is used, then space utilization is improved, but device complexity increases
Solution Approach 1:
The electrical shutoff switch actuation mechanism is nested within the lever assembly structure. The switch and its linkages are positioned inside or integrated into the lever body, allowing the entire combination lever assembly to occupy minimal space while maintaining all necessary functions.
Data Source
AI summary
A combination lever for a carburetor is an integrated shutoff lever and fuel valve. The combination lever includes a longitudinal portion for a handle and a cylindrical portion including a fuel path for the fuel valve. A carburetor casing is shaped to form a valve chamber and a carburetor chamber. The valve chamber supports the cylindrical portion. A directional cavity formed in the cylindrical portion of the combination lever regulates a flow of fuel to the carburetor chamber according to a rotation of the combination lever. At one position the directional cavity opens the fuel path so that fuel flows into the carburetor chamber. At another position the directional cavity closes the fuel path so that the flow of fuel is blocked. The combination lever may also include an abutment portion to engage a switch for completing an electrical shutoff path to an engine coupled to the carburetor.