Riding Mower Cutting Deck Height Adjustment From the Operator Seat

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Solution Overview

Problem

Existing riding lawn care vehicles with center-mounted cutting decks require significant time and effort to adjust the cutting deck height, which can be cumbersome and inefficient.

Innovation Solution

A deck height adjustment assembly comprising a carriage assembly and a rotary assembly, allowing operators to adjust the cutting deck height from the operating position of the vehicle, reducing the time and effort required for height adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional cutting deck height adjustment mechanisms are used, then the structure is simple, but the time and effort required to adjust height is significant

Engineering Contradiction:

Improveease of height adjustmentVSAvoidtime required for height adjustment

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent implements a dynamic height adjustment system where the cutting deck height can be changed on-the-fly during operation. The carriage assembly allows the cutting deck to be raised and lowered while the vehicle is moving, eliminating the need to stop for height adjustments. This dynamic capability directly addresses the time loss and operational inconvenience associated with traditional static adjustment mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent replaces traditional manual mechanical adjustment mechanisms with an automated system. The rotary assembly with selectable positions and the carriage assembly work together to automatically position the cutting deck at the desired height when the operator selects a position, reducing the physical effort and time required compared to manual adjustment methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If traditional cutting deck height adjustment mechanisms are used, then the structure is simple, but the effort required to adjust height is significant

Engineering Contradiction:

Improveease of height adjustmentVSAvoideffort required for height adjustment

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The carriage assembly incorporates a counterweight mechanism that balances the cutting deck's weight during height adjustment. This counterbalancing system significantly reduces the force required by the operator to raise or lower the cutting deck, making the adjustment process effortless while maintaining full control.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent replaces manual force-based adjustment mechanisms with an automated mechanical system. The rotary assembly selectively positions the carriage, which then automatically raises or lowers the cutting deck using the counterweight mechanism, eliminating the need for the operator to apply significant physical force.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If on-the-fly height adjustment is implemented, then operational efficiency is improved, but device complexity increases

Engineering Contradiction:

Improveoperational efficiencyVSAvoidcomplexity of height adjustment assembly

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The height adjustment system is divided into two independent functional modules: the carriage assembly that provides vertical movement capability, and the rotary assembly that provides height selection. This segmentation allows each module to be optimized independently and simplifies the overall control logic, as the rotary assembly simply selects positions while the carriage assembly executes the movement, balancing functionality with manageable complexity.

Inventive Principle:

Principle #1Segmentation

4Area of stationary object

If center-mounted cutting deck is used, then cutting width is increased, but accessibility for height adjustment is reduced

Engineering Contradiction:

Improvecutting widthVSAvoidaccessibility for height adjustment

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

The rotary assembly acts as an intermediary control mechanism that allows the operator to select desired height positions from the seat area without needing to physically access the cutting deck. The carriage assembly then translates this selection into actual deck position changes, mediating between the operator's control inputs and the cutting deck's physical movement, thus maintaining accessibility despite the center-mounted configuration.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250169396A1Cutting deck height adjustment for a riding lawn mower

Publication Date: 2025.05.29 HUSQVARNA AB

AI summary

A riding lawn care vehicle (10) includes a frame (60, 120) to which wheels of the riding lawn care vehicle are attached, a seat (20) in which an operator of the riding lawn care vehicle is positioned when operating the riding lawn care vehicle, a cutting deck (140) that comprises a cutting blade and a housing frame, wherein the housing frame is configured to support a housing inside which the cutting blade is housed, and a deck height adjustment assembly (150) that comprises a carriage assembly (154) and a rotary assembly (152), wherein the carriage assembly and the rotary assembly are operable by the operator positioned in the seat. The carriage assembly couples the frame of the riding lawn care vehicle to the cutting deck of the riding lawn care vehicle, and the rotary assembly is configured to set a height for the cutting deck.