Adjustable Lawn Mower Handle With Dual Levers
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Solution Overview
Problem
Lawn mower handles have limited control access and lack the ability to adjust ground speeds or include a clutch for modulating speed during operation, due to ergonomic design constraints and space limitations on gripping areas.
Innovation Solution
An adjustable electric control handle with a clutch lever and brake lever, each actuating between extended and depressed positions, and a controller that uses sensors to detect positions and modulate ground speed, allowing for adjustment between maximum and minimum speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If controls are mounted on the gripping areas of the handle, then the user can manipulate controls while gripping the handle, but the access to controls is limited and ergonomic designs provide limited control means
Solution Approach 1:
The patent introduces a new spatial dimension by placing controls on the underside of the handle where the user's thumb naturally rests, rather than only on the top gripping surfaces. This allows additional controls (clutch lever, brake lever, speed adjustment) to be accessed without changing the fundamental gripping posture, effectively adding a third dimension of control accessibility.
Solution Approach 2:
The handle underside is designed as a multi-functional control zone that accommodates multiple independent controls (clutch lever, brake lever, ground speed adjustment mechanism) within a single ergonomic structure. This allows the handle to serve both as a gripping surface and as a comprehensive control panel, increasing versatility without compromising ergonomics.
2Ease of operation
If the handle gripping areas are designed ergonomically, then user comfort is improved, but the space for controls is limited
Solution Approach 1:
The patent utilizes the underside surface area of the handle as an additional control zone, effectively doubling the available control space without increasing the handle's external dimensions or compromising ergonomic gripping surfaces. This dimensional expansion allows multiple controls to be positioned within the natural thumb rest area.
Solution Approach 2:
The handle design concentrates control elements in the specific local region where the user's thumb naturally rests during operation. This localized control zone optimizes the distribution of controls according to actual user interaction patterns, providing adequate control space precisely where it is most accessible without affecting overall handle ergonomics.
3Adaptability or versatility
If known lawn mower handles are used, then the basic gripping function is provided, but the ability to adjust preset ground speeds or include a clutch is lacking
Solution Approach 1:
The handle is designed as a multi-functional control hub that integrates clutch operation, brake control, and ground speed adjustment mechanisms within a single ergonomic structure. This universal control platform allows the handle to perform multiple functions (gripping, clutching, braking, speed modulation) without requiring separate control assemblies, thereby increasing versatility while managing complexity through integration.
Solution Approach 2:
The patent combines multiple control functions (clutch lever, brake lever, speed adjustment mechanism) into a single integrated handle assembly. By merging these previously separate controls into one unified structure, the system achieves enhanced functionality while reducing the overall structural complexity that would result from having multiple separate control mechanisms.
Data Source
AI summary
A control handle for a lawn mower includes a first lever and a second lever facing the first lever. Each lever is configured to actuate between an extended position and a depressed position. A controller is operatively associated with each of the first lever and the second lever so as to determine a position of the first lever with respect to the depressed position or the extended position of the first lever, and a position of the second lever with respect to the depressed position or the extended position of the second lever. Also, the first lever defines an interior having an opening facing the second lever such that the interior of the first lever is configured for receiving the second lever when at least one of the first lever and the second lever are actuated toward the respective depressed position.