Movable Assist Handle for Zero-Turn Mower Operator Access
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Solution Overview
Problem
Operators of zero-turning-radius (ZTR) riding lawn mowers face difficulties in stepping onto and off the vehicle due to the lack of a convenient gripping structure, as the traditional twin lever control system does not provide a useful grip, leading to operators seeking alternative structures like the seat or armrest, which are not conveniently located for ingress and egress.
Innovation Solution
A movable assist handle is integrated into the vehicle's frame, featuring a grip portion that can be deployed to a higher elevation for easy access and stowed to a lower elevation when not in use, providing a dedicated gripping point for operators to climb on and off the mower while minimizing visual interference when seated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the twin lever control system is used for ZTR mower control, then the mower achieves zero-turning-radius capability and maneuverability, but the control levers do not provide a useful gripping structure to assist the operator when climbing on and off the mower
Solution Approach 1:
The control lever is designed to serve dual functions: controlling the drive wheel for ZTR maneuverability and providing a gripping structure for operator access. The lever's position and geometry are optimized to allow operators to grasp it comfortably when climbing on or off the mower, while maintaining its primary control function.
2Ease of operation
If the operator grasps the seat or armrest for assistance during ingress and egress, then some gripping support is provided, but the seat structure is located aft of the control levers making it inconvenient when entering from the typical access location
Solution Approach 1:
The control lever serves as both a control mechanism and an assist handle, eliminating the need for separate structural additions for gripping support.
Solution Approach 2:
The existing control lever structure is utilized for the additional function of providing grip assistance, rather than adding separate dedicated assist structures.
Data Source
AI summary
An assist handle for assisting an operator with climbing on to, or off of, a ground maintenance vehicle such as a mower, and a ground maintenance vehicle incorporating the same. The assist handle includes, in one embodiment, a grip portion movable between a deployed position, wherein the grip portion is positioned at a deployed elevation configured to assist the operator with ingress to, or egress from, a platform such as a seat; and a stowed position, wherein the grip portion is positioned at a stowed elevation lower than the deployed elevation.