Integrated Ignition Switch With Speed Selection for Outdoor Power Equipment
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Solution Overview
Problem
Existing outdoor power equipment, such as snow blowers and lawn mowers, require separate components and circuitry for starter control and speed control, leading to increased cost and complexity.
Innovation Solution
A combination ignition and speed control assembly that integrates key-operated switch circuitry to control both engine starting and speed selection, eliminating the need for separate starter and speed control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate components are used for starter control and speed control, then each function can be independently controlled, but the device complexity and number of components increases
Solution Approach 1:
The patent combines the ignition switch and speed control into a single integrated assembly. The ignition switch housing incorporates a speed control dial, and a single shaft performs both ignition switching and speed regulation functions. This merging eliminates separate components while maintaining independent control capability through the multi-position rotary mechanism.
Solution Approach 2:
The single shaft in the integrated assembly serves multiple functions: it acts as both the ignition switch actuator and the speed control dial indicator. The same mechanical component enables both starting the engine and selecting operating speeds, making the system more versatile without adding complexity.
2Ease of operation
If separate components are used for starter control and speed control, then each function can be independently controlled, but the cost increases
Solution Approach 1:
By merging the ignition switch and speed control into one assembly with shared housing, shaft, and circuit board components, the patent reduces the total number of parts that need to be manufactured, inventoried, and assembled. This consolidation lowers manufacturing costs while preserving independent control functionality through the integrated multi-position rotary mechanism.
3Ease of operation
If separate components are used for starter control and speed control, then each function can be independently controlled, but the reliability decreases due to additional failure points
Solution Approach 1:
The integration of ignition and speed control into a single assembly with a unified shaft and circuit board reduces the number of connection points and potential failure interfaces. Fewer separate components mean fewer opportunities for mechanical failure, electrical connection issues, and synchronization problems, thereby improving overall system reliability while maintaining independent control capability.
Data Source
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AI summary
A powered device may include an engine, a mobility assembly operably coupled to the engine to provide mobility of the powered device responsive at least in part to operation of the engine, a working assembly operably coupled to the engine to perform a working function responsive at least in part to operation of the engine, and a key-operated combination ignition and speed control assembly including switch circuitry configured to control both starting the engine and selection of different selectable positions corresponding to respective different operating speeds for the engine.