Articulating Lawn Mower Cutting Deck for Uneven Terrain
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Solution Overview
Problem
Lawn mowers with rigid cutting decks struggle to navigate uneven terrain, leading to scalping, skipping, and streaking of grass, and require cumbersome maintenance and storage due to fixed cutting widths and inaccessible underside components.
Innovation Solution
An articulating cutting deck mechanism with hinged support arms and distance sensors allows for adjustable height and angle to follow ground contours, enabling flexible cutting width adjustments and easy maintenance by raising the deck to an upright position for improved maneuverability and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid and/or fixed cutting deck is used, then the structure is simple and stable, but it cannot conform to uneven terrain causing scalping, skipping, and streaking of grass
Solution Approach 1:
The cutting deck is divided into multiple independent cutter bars that can move relative to each other. Each cutter bar is mounted on separate support arms allowing individual adjustment to follow terrain contours, enabling the deck to adapt to uneven ground while maintaining cutting quality
Solution Approach 2:
The cutting deck transitions from a fixed rigid structure to a dynamic articulated system with movable support arms and adjustable cutter bars. The deck can change its configuration in real-time to match terrain variations, improving both adaptability and cutting reliability
2Ease of operation
If the cutting deck is front-mounted for improved stability and maneuverability, then mowing performance is enhanced, but the underside becomes inaccessible for servicing and the overall length increases for storage
Solution Approach 1:
The cutting deck is designed with articulation mechanisms that allow it to pivot between operational and service positions. The deck can be raised to an upright position for maintenance access while maintaining front-mounted configuration during operation for optimal maneuverability
Solution Approach 2:
The cutting deck utilizes vertical articulation to transition between horizontal operational position and vertical service position. This dimensional change provides accessibility for servicing while preserving the front-mounted configuration for maneuverability during mowing operations
3Adaptability or versatility
If a fixed cutting width is used, then the structure is simple, but it cannot accommodate obstacles and narrow passages
Solution Approach 1:
The cutting deck is segmented into multiple independently adjustable cutter bars. Each cutter bar can be positioned at different widths from the centerline, allowing the total cutting width to be varied by adjusting individual bar positions rather than moving entire deck sections
Solution Approach 2:
The cutting width is made variable through dynamic adjustment of cutter bar positions. The support arms and cutter bars can be repositioned to change the overall cutting width, enabling navigation through narrow passages while maintaining the ability to provide wide coverage when needed
Data Source
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AI summary
A ride-on lawn mower (1) having forward direction (2) and a seat (3) defining an operator position, a front mounted cutting deck (8), and at least a first cutter bar enclosed in a first cutter housing (12) and a second cutter bar enclosed in a second cutter housing (13) for cutting grass on a lawn, the first cutter housing (12) being attached to a centre cutter housing (11) by a first support arm (15), the second cutter housing (13) being attached to the centre cutter housing (11) by a second support arm (16), said support arms (15, 16) are connected to the centre cutter housing (11) by a hinge mechanism, characterized in that, at least one of the support arms (15, 16) changes an angle and a height with respect to a transverse centre axis (C2) of the centre cutter housing (11) to follow a contour of a ground surface.